graal-jvmci-8: src/share/vm/opto/loopnode.cpp annotate

annotate src/share/vm/opto/loopnode.cpp @ 23484:501f014415d8

8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true Summary: Restore the major_progress flag before calling igvn.optimize(). Reviewed-by: kvn

author	thartmann
date	Mon, 21 Dec 2015 11:34:58 +0100
parents	7c5babab479b
children	c9035b8e388b

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 17914 diff changeset	2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1172 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1172 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1172 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	26 #include "ci/ciMethodData.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	27 #include "compiler/compileLog.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	28 #include "libadt/vectset.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	29 #include "memory/allocation.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	30 #include "opto/addnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	31 #include "opto/callnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	32 #include "opto/connode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	33 #include "opto/divnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	34 #include "opto/idealGraphPrinter.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	35 #include "opto/loopnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	36 #include "opto/mulnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	37 #include "opto/rootnode.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1763 diff changeset	38 #include "opto/superword.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	39
a61af66fc99e Initial load duke parents: diff changeset	40 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	41 //------------------------------is_loop_iv-------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	42 // Determine if a node is Counted loop induction variable.
a61af66fc99e Initial load duke parents: diff changeset	43 // The method is declared in node.hpp.
a61af66fc99e Initial load duke parents: diff changeset	44 const Node* Node::is_loop_iv() const {
a61af66fc99e Initial load duke parents: diff changeset	45 if (this->is_Phi() && !this->as_Phi()->is_copy() &&
a61af66fc99e Initial load duke parents: diff changeset	46 this->as_Phi()->region()->is_CountedLoop() &&
a61af66fc99e Initial load duke parents: diff changeset	47 this->as_Phi()->region()->as_CountedLoop()->phi() == this) {
a61af66fc99e Initial load duke parents: diff changeset	48 return this;
a61af66fc99e Initial load duke parents: diff changeset	49 } else {
a61af66fc99e Initial load duke parents: diff changeset	50 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	51 }
a61af66fc99e Initial load duke parents: diff changeset	52 }
a61af66fc99e Initial load duke parents: diff changeset	53
a61af66fc99e Initial load duke parents: diff changeset	54 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	55 //------------------------------dump_spec--------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	56 // Dump special per-node info
a61af66fc99e Initial load duke parents: diff changeset	57 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	58 void LoopNode::dump_spec(outputStream *st) const {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	59 if (is_inner_loop()) st->print( "inner " );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	60 if (is_partial_peel_loop()) st->print( "partial_peel " );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	61 if (partial_peel_has_failed()) st->print( "partial_peel_failed " );
0 a61af66fc99e Initial load duke parents: diff changeset	62 }
a61af66fc99e Initial load duke parents: diff changeset	63 #endif
a61af66fc99e Initial load duke parents: diff changeset	64
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	65 //------------------------------is_valid_counted_loop-------------------------
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	66 bool LoopNode::is_valid_counted_loop() const {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	67 if (is_CountedLoop()) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	68 CountedLoopNode* l = as_CountedLoop();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	69 CountedLoopEndNode* le = l->loopexit();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	70 if (le != NULL &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	71 le->proj_out(1 /* true */) == l->in(LoopNode::LoopBackControl)) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	72 Node* phi = l->phi();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	73 Node* exit = le->proj_out(0 /* false */);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	74 if (exit != NULL && exit->Opcode() == Op_IfFalse &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	75 phi != NULL && phi->is_Phi() &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	76 phi->in(LoopNode::LoopBackControl) == l->incr() &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	77 le->loopnode() == l && le->stride_is_con()) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	78 return true;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	79 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	80 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	81 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	82 return false;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	83 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	84
0 a61af66fc99e Initial load duke parents: diff changeset	85 //------------------------------get_early_ctrl---------------------------------
a61af66fc99e Initial load duke parents: diff changeset	86 // Compute earliest legal control
a61af66fc99e Initial load duke parents: diff changeset	87 Node PhaseIdealLoop::get_early_ctrl( Node n ) {
a61af66fc99e Initial load duke parents: diff changeset	88 assert( !n->is_Phi() && !n->is_CFG(), "this code only handles data nodes" );
a61af66fc99e Initial load duke parents: diff changeset	89 uint i;
a61af66fc99e Initial load duke parents: diff changeset	90 Node *early;
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	91 if (n->in(0) && !n->is_expensive()) {
0 a61af66fc99e Initial load duke parents: diff changeset	92 early = n->in(0);
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	93 if (!early->is_CFG()) // Might be a non-CFG multi-def
0 a61af66fc99e Initial load duke parents: diff changeset	94 early = get_ctrl(early); // So treat input as a straight data input
a61af66fc99e Initial load duke parents: diff changeset	95 i = 1;
a61af66fc99e Initial load duke parents: diff changeset	96 } else {
a61af66fc99e Initial load duke parents: diff changeset	97 early = get_ctrl(n->in(1));
a61af66fc99e Initial load duke parents: diff changeset	98 i = 2;
a61af66fc99e Initial load duke parents: diff changeset	99 }
a61af66fc99e Initial load duke parents: diff changeset	100 uint e_d = dom_depth(early);
a61af66fc99e Initial load duke parents: diff changeset	101 assert( early, "" );
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	102 for (; i < n->req(); i++) {
0 a61af66fc99e Initial load duke parents: diff changeset	103 Node *cin = get_ctrl(n->in(i));
a61af66fc99e Initial load duke parents: diff changeset	104 assert( cin, "" );
a61af66fc99e Initial load duke parents: diff changeset	105 // Keep deepest dominator depth
a61af66fc99e Initial load duke parents: diff changeset	106 uint c_d = dom_depth(cin);
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	107 if (c_d > e_d) { // Deeper guy?
0 a61af66fc99e Initial load duke parents: diff changeset	108 early = cin; // Keep deepest found so far
a61af66fc99e Initial load duke parents: diff changeset	109 e_d = c_d;
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	110 } else if (c_d == e_d && // Same depth?
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	111 early != cin) { // If not equal, must use slower algorithm
0 a61af66fc99e Initial load duke parents: diff changeset	112 // If same depth but not equal, one _must_ dominate the other
a61af66fc99e Initial load duke parents: diff changeset	113 // and we want the deeper (i.e., dominated) guy.
a61af66fc99e Initial load duke parents: diff changeset	114 Node *n1 = early;
a61af66fc99e Initial load duke parents: diff changeset	115 Node *n2 = cin;
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	116 while (1) {
0 a61af66fc99e Initial load duke parents: diff changeset	117 n1 = idom(n1); // Walk up until break cycle
a61af66fc99e Initial load duke parents: diff changeset	118 n2 = idom(n2);
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	119 if (n1 == cin \|\| // Walked early up to cin
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	120 dom_depth(n2) < c_d)
0 a61af66fc99e Initial load duke parents: diff changeset	121 break; // early is deeper; keep him
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	122 if (n2 == early \|\| // Walked cin up to early
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	123 dom_depth(n1) < c_d) {
0 a61af66fc99e Initial load duke parents: diff changeset	124 early = cin; // cin is deeper; keep him
a61af66fc99e Initial load duke parents: diff changeset	125 break;
a61af66fc99e Initial load duke parents: diff changeset	126 }
a61af66fc99e Initial load duke parents: diff changeset	127 }
a61af66fc99e Initial load duke parents: diff changeset	128 e_d = dom_depth(early); // Reset depth register cache
a61af66fc99e Initial load duke parents: diff changeset	129 }
a61af66fc99e Initial load duke parents: diff changeset	130 }
a61af66fc99e Initial load duke parents: diff changeset	131
a61af66fc99e Initial load duke parents: diff changeset	132 // Return earliest legal location
a61af66fc99e Initial load duke parents: diff changeset	133 assert(early == find_non_split_ctrl(early), "unexpected early control");
a61af66fc99e Initial load duke parents: diff changeset	134
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	135 if (n->is_expensive()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	136 assert(n->in(0), "should have control input");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	137 early = get_early_ctrl_for_expensive(n, early);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	138 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	139
0 a61af66fc99e Initial load duke parents: diff changeset	140 return early;
a61af66fc99e Initial load duke parents: diff changeset	141 }
a61af66fc99e Initial load duke parents: diff changeset	142
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	143 //------------------------------get_early_ctrl_for_expensive---------------------------------
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	144 // Move node up the dominator tree as high as legal while still beneficial
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	145 Node PhaseIdealLoop::get_early_ctrl_for_expensive(Node n, Node* earliest) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	146 assert(n->in(0) && n->is_expensive(), "expensive node with control input here");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	147 assert(OptimizeExpensiveOps, "optimization off?");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	148
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	149 Node* ctl = n->in(0);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	150 assert(ctl->is_CFG(), "expensive input 0 must be cfg");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	151 uint min_dom_depth = dom_depth(earliest);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	152 #ifdef ASSERT
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	153 if (!is_dominator(ctl, earliest) && !is_dominator(earliest, ctl)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	154 dump_bad_graph("Bad graph detected in get_early_ctrl_for_expensive", n, earliest, ctl);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	155 assert(false, "Bad graph detected in get_early_ctrl_for_expensive");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	156 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	157 #endif
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	158 if (dom_depth(ctl) < min_dom_depth) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	159 return earliest;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	160 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	161
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	162 while (1) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	163 Node *next = ctl;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	164 // Moving the node out of a loop on the projection of a If
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	165 // confuses loop predication. So once we hit a Loop in a If branch
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	166 // that doesn't branch to an UNC, we stop. The code that process
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	167 // expensive nodes will notice the loop and skip over it to try to
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	168 // move the node further up.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	169 if (ctl->is_CountedLoop() && ctl->in(1) != NULL && ctl->in(1)->in(0) != NULL && ctl->in(1)->in(0)->is_If()) {
12956 3213ba4d3dff 8024069: replace_in_map() should operate on parent maps roland parents: 10405 diff changeset	170 if (!ctl->in(1)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none)) {
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	171 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	172 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	173 next = idom(ctl->in(1)->in(0));
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	174 } else if (ctl->is_Proj()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	175 // We only move it up along a projection if the projection is
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	176 // the single control projection for its parent: same code path,
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	177 // if it's a If with UNC or fallthrough of a call.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	178 Node* parent_ctl = ctl->in(0);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	179 if (parent_ctl == NULL) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	180 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	181 } else if (parent_ctl->is_CountedLoopEnd() && parent_ctl->as_CountedLoopEnd()->loopnode() != NULL) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	182 next = parent_ctl->as_CountedLoopEnd()->loopnode()->init_control();
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	183 } else if (parent_ctl->is_If()) {
12956 3213ba4d3dff 8024069: replace_in_map() should operate on parent maps roland parents: 10405 diff changeset	184 if (!ctl->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none)) {
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	185 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	186 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	187 assert(idom(ctl) == parent_ctl, "strange");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	188 next = idom(parent_ctl);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	189 } else if (ctl->is_CatchProj()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	190 if (ctl->as_Proj()->_con != CatchProjNode::fall_through_index) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	191 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	192 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	193 assert(parent_ctl->in(0)->in(0)->is_Call(), "strange graph");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	194 next = parent_ctl->in(0)->in(0)->in(0);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	195 } else {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	196 // Check if parent control has a single projection (this
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	197 // control is the only possible successor of the parent
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	198 // control). If so, we can try to move the node above the
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	199 // parent control.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	200 int nb_ctl_proj = 0;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	201 for (DUIterator_Fast imax, i = parent_ctl->fast_outs(imax); i < imax; i++) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	202 Node *p = parent_ctl->fast_out(i);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	203 if (p->is_Proj() && p->is_CFG()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	204 nb_ctl_proj++;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	205 if (nb_ctl_proj > 1) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	206 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	207 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	208 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	209 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	210
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	211 if (nb_ctl_proj > 1) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	212 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	213 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	214 assert(parent_ctl->is_Start() \|\| parent_ctl->is_MemBar() \|\| parent_ctl->is_Call(), "unexpected node");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	215 assert(idom(ctl) == parent_ctl, "strange");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	216 next = idom(parent_ctl);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	217 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	218 } else {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	219 next = idom(ctl);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	220 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	221 if (next->is_Root() \|\| next->is_Start() \|\| dom_depth(next) < min_dom_depth) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	222 break;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	223 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	224 ctl = next;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	225 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	226
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	227 if (ctl != n->in(0)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	228 _igvn.hash_delete(n);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	229 n->set_req(0, ctl);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	230 _igvn.hash_insert(n);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	231 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	232
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	233 return ctl;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	234 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	235
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	236
0 a61af66fc99e Initial load duke parents: diff changeset	237 //------------------------------set_early_ctrl---------------------------------
a61af66fc99e Initial load duke parents: diff changeset	238 // Set earliest legal control
a61af66fc99e Initial load duke parents: diff changeset	239 void PhaseIdealLoop::set_early_ctrl( Node *n ) {
a61af66fc99e Initial load duke parents: diff changeset	240 Node *early = get_early_ctrl(n);
a61af66fc99e Initial load duke parents: diff changeset	241
a61af66fc99e Initial load duke parents: diff changeset	242 // Record earliest legal location
a61af66fc99e Initial load duke parents: diff changeset	243 set_ctrl(n, early);
a61af66fc99e Initial load duke parents: diff changeset	244 }
a61af66fc99e Initial load duke parents: diff changeset	245
a61af66fc99e Initial load duke parents: diff changeset	246 //------------------------------set_subtree_ctrl-------------------------------
a61af66fc99e Initial load duke parents: diff changeset	247 // set missing _ctrl entries on new nodes
a61af66fc99e Initial load duke parents: diff changeset	248 void PhaseIdealLoop::set_subtree_ctrl( Node *n ) {
a61af66fc99e Initial load duke parents: diff changeset	249 // Already set? Get out.
a61af66fc99e Initial load duke parents: diff changeset	250 if( _nodes[n->_idx] ) return;
a61af66fc99e Initial load duke parents: diff changeset	251 // Recursively set _nodes array to indicate where the Node goes
a61af66fc99e Initial load duke parents: diff changeset	252 uint i;
a61af66fc99e Initial load duke parents: diff changeset	253 for( i = 0; i < n->req(); ++i ) {
a61af66fc99e Initial load duke parents: diff changeset	254 Node *m = n->in(i);
a61af66fc99e Initial load duke parents: diff changeset	255 if( m && m != C->root() )
a61af66fc99e Initial load duke parents: diff changeset	256 set_subtree_ctrl( m );
a61af66fc99e Initial load duke parents: diff changeset	257 }
a61af66fc99e Initial load duke parents: diff changeset	258
a61af66fc99e Initial load duke parents: diff changeset	259 // Fixup self
a61af66fc99e Initial load duke parents: diff changeset	260 set_early_ctrl( n );
a61af66fc99e Initial load duke parents: diff changeset	261 }
a61af66fc99e Initial load duke parents: diff changeset	262
a61af66fc99e Initial load duke parents: diff changeset	263 //------------------------------is_counted_loop--------------------------------
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	264 bool PhaseIdealLoop::is_counted_loop( Node x, IdealLoopTree loop ) {
0 a61af66fc99e Initial load duke parents: diff changeset	265 PhaseGVN *gvn = &_igvn;
a61af66fc99e Initial load duke parents: diff changeset	266
a61af66fc99e Initial load duke parents: diff changeset	267 // Counted loop head must be a good RegionNode with only 3 not NULL
a61af66fc99e Initial load duke parents: diff changeset	268 // control input edges: Self, Entry, LoopBack.
17914 3636afd5ec1a 8039298: assert(base == NULL \|\| t_adr->isa_rawptr() \|\| !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) kvn parents: 17887 diff changeset	269 if (x->in(LoopNode::Self) == NULL \|\| x->req() != 3 \|\| loop->_irreducible) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	270 return false;
17914 3636afd5ec1a 8039298: assert(base == NULL \|\| t_adr->isa_rawptr() \|\| !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) kvn parents: 17887 diff changeset	271 }
0 a61af66fc99e Initial load duke parents: diff changeset	272 Node *init_control = x->in(LoopNode::EntryControl);
a61af66fc99e Initial load duke parents: diff changeset	273 Node *back_control = x->in(LoopNode::LoopBackControl);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	274 if (init_control == NULL \|\| back_control == NULL) // Partially dead
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	275 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	276 // Must also check for TOP when looking for a dead loop
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	277 if (init_control->is_top() \|\| back_control->is_top())
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	278 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	279
a61af66fc99e Initial load duke parents: diff changeset	280 // Allow funny placement of Safepoint
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	281 if (back_control->Opcode() == Op_SafePoint)
0 a61af66fc99e Initial load duke parents: diff changeset	282 back_control = back_control->in(TypeFunc::Control);
a61af66fc99e Initial load duke parents: diff changeset	283
a61af66fc99e Initial load duke parents: diff changeset	284 // Controlling test for loop
a61af66fc99e Initial load duke parents: diff changeset	285 Node *iftrue = back_control;
a61af66fc99e Initial load duke parents: diff changeset	286 uint iftrue_op = iftrue->Opcode();
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	287 if (iftrue_op != Op_IfTrue &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	288 iftrue_op != Op_IfFalse)
0 a61af66fc99e Initial load duke parents: diff changeset	289 // I have a weird back-control. Probably the loop-exit test is in
a61af66fc99e Initial load duke parents: diff changeset	290 // the middle of the loop and I am looking at some trailing control-flow
a61af66fc99e Initial load duke parents: diff changeset	291 // merge point. To fix this I would have to partially peel the loop.
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	292 return false; // Obscure back-control
0 a61af66fc99e Initial load duke parents: diff changeset	293
a61af66fc99e Initial load duke parents: diff changeset	294 // Get boolean guarding loop-back test
a61af66fc99e Initial load duke parents: diff changeset	295 Node *iff = iftrue->in(0);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	296 if (get_loop(iff) != loop \|\| !iff->in(1)->is_Bool())
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	297 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	298 BoolNode *test = iff->in(1)->as_Bool();
a61af66fc99e Initial load duke parents: diff changeset	299 BoolTest::mask bt = test->_test._test;
a61af66fc99e Initial load duke parents: diff changeset	300 float cl_prob = iff->as_If()->_prob;
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	301 if (iftrue_op == Op_IfFalse) {
0 a61af66fc99e Initial load duke parents: diff changeset	302 bt = BoolTest(bt).negate();
a61af66fc99e Initial load duke parents: diff changeset	303 cl_prob = 1.0 - cl_prob;
a61af66fc99e Initial load duke parents: diff changeset	304 }
a61af66fc99e Initial load duke parents: diff changeset	305 // Get backedge compare
a61af66fc99e Initial load duke parents: diff changeset	306 Node *cmp = test->in(1);
a61af66fc99e Initial load duke parents: diff changeset	307 int cmp_op = cmp->Opcode();
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	308 if (cmp_op != Op_CmpI)
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	309 return false; // Avoid pointer & float compares
0 a61af66fc99e Initial load duke parents: diff changeset	310
a61af66fc99e Initial load duke parents: diff changeset	311 // Find the trip-counter increment & limit. Limit must be loop invariant.
a61af66fc99e Initial load duke parents: diff changeset	312 Node *incr = cmp->in(1);
a61af66fc99e Initial load duke parents: diff changeset	313 Node *limit = cmp->in(2);
a61af66fc99e Initial load duke parents: diff changeset	314
a61af66fc99e Initial load duke parents: diff changeset	315 // ---------
a61af66fc99e Initial load duke parents: diff changeset	316 // need 'loop()' test to tell if limit is loop invariant
a61af66fc99e Initial load duke parents: diff changeset	317 // ---------
a61af66fc99e Initial load duke parents: diff changeset	318
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	319 if (!is_member(loop, get_ctrl(incr))) { // Swapped trip counter and limit?
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	320 Node *tmp = incr; // Then reverse order into the CmpI
0 a61af66fc99e Initial load duke parents: diff changeset	321 incr = limit;
a61af66fc99e Initial load duke parents: diff changeset	322 limit = tmp;
a61af66fc99e Initial load duke parents: diff changeset	323 bt = BoolTest(bt).commute(); // And commute the exit test
a61af66fc99e Initial load duke parents: diff changeset	324 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	325 if (is_member(loop, get_ctrl(limit))) // Limit must be loop-invariant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	326 return false;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	327 if (!is_member(loop, get_ctrl(incr))) // Trip counter must be loop-variant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	328 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	329
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	330 Node* phi_incr = NULL;
0 a61af66fc99e Initial load duke parents: diff changeset	331 // Trip-counter increment must be commutative & associative.
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	332 if (incr->is_Phi()) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	333 if (incr->as_Phi()->region() != x \|\| incr->req() != 3)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	334 return false; // Not simple trip counter expression
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	335 phi_incr = incr;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	336 incr = phi_incr->in(LoopNode::LoopBackControl); // Assume incr is on backedge of Phi
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	337 if (!is_member(loop, get_ctrl(incr))) // Trip counter must be loop-variant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	338 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	339 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	340
0 a61af66fc99e Initial load duke parents: diff changeset	341 Node* trunc1 = NULL;
a61af66fc99e Initial load duke parents: diff changeset	342 Node* trunc2 = NULL;
a61af66fc99e Initial load duke parents: diff changeset	343 const TypeInt* iv_trunc_t = NULL;
a61af66fc99e Initial load duke parents: diff changeset	344 if (!(incr = CountedLoopNode::match_incr_with_optional_truncation(incr, &trunc1, &trunc2, &iv_trunc_t))) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	345 return false; // Funny increment opcode
0 a61af66fc99e Initial load duke parents: diff changeset	346 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	347 assert(incr->Opcode() == Op_AddI, "wrong increment code");
0 a61af66fc99e Initial load duke parents: diff changeset	348
a61af66fc99e Initial load duke parents: diff changeset	349 // Get merge point
a61af66fc99e Initial load duke parents: diff changeset	350 Node *xphi = incr->in(1);
a61af66fc99e Initial load duke parents: diff changeset	351 Node *stride = incr->in(2);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	352 if (!stride->is_Con()) { // Oops, swap these
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	353 if (!xphi->is_Con()) // Is the other guy a constant?
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	354 return false; // Nope, unknown stride, bail out
0 a61af66fc99e Initial load duke parents: diff changeset	355 Node *tmp = xphi; // 'incr' is commutative, so ok to swap
a61af66fc99e Initial load duke parents: diff changeset	356 xphi = stride;
a61af66fc99e Initial load duke parents: diff changeset	357 stride = tmp;
a61af66fc99e Initial load duke parents: diff changeset	358 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	359 // Stride must be constant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	360 int stride_con = stride->get_int();
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	361 if (stride_con == 0)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	362 return false; // missed some peephole opt
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	363
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	364 if (!xphi->is_Phi())
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	365 return false; // Too much math on the trip counter
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	366 if (phi_incr != NULL && phi_incr != xphi)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	367 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	368 PhiNode *phi = xphi->as_Phi();
a61af66fc99e Initial load duke parents: diff changeset	369
a61af66fc99e Initial load duke parents: diff changeset	370 // Phi must be of loop header; backedge must wrap to increment
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	371 if (phi->region() != x)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	372 return false;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	373 if (trunc1 == NULL && phi->in(LoopNode::LoopBackControl) != incr \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	374 trunc1 != NULL && phi->in(LoopNode::LoopBackControl) != trunc1) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	375 return false;
0 a61af66fc99e Initial load duke parents: diff changeset	376 }
a61af66fc99e Initial load duke parents: diff changeset	377 Node *init_trip = phi->in(LoopNode::EntryControl);
a61af66fc99e Initial load duke parents: diff changeset	378
a61af66fc99e Initial load duke parents: diff changeset	379 // If iv trunc type is smaller than int, check for possible wrap.
a61af66fc99e Initial load duke parents: diff changeset	380 if (!TypeInt::INT->higher_equal(iv_trunc_t)) {
a61af66fc99e Initial load duke parents: diff changeset	381 assert(trunc1 != NULL, "must have found some truncation");
a61af66fc99e Initial load duke parents: diff changeset	382
a61af66fc99e Initial load duke parents: diff changeset	383 // Get a better type for the phi (filtered thru if's)
a61af66fc99e Initial load duke parents: diff changeset	384 const TypeInt* phi_ft = filtered_type(phi);
a61af66fc99e Initial load duke parents: diff changeset	385
a61af66fc99e Initial load duke parents: diff changeset	386 // Can iv take on a value that will wrap?
a61af66fc99e Initial load duke parents: diff changeset	387 //
a61af66fc99e Initial load duke parents: diff changeset	388 // Ensure iv's limit is not within "stride" of the wrap value.
a61af66fc99e Initial load duke parents: diff changeset	389 //
a61af66fc99e Initial load duke parents: diff changeset	390 // Example for "short" type
a61af66fc99e Initial load duke parents: diff changeset	391 // Truncation ensures value is in the range -32768..32767 (iv_trunc_t)
a61af66fc99e Initial load duke parents: diff changeset	392 // If the stride is +10, then the last value of the induction
a61af66fc99e Initial load duke parents: diff changeset	393 // variable before the increment (phi_ft->_hi) must be
a61af66fc99e Initial load duke parents: diff changeset	394 // <= 32767 - 10 and (phi_ft->_lo) must be >= -32768 to
a61af66fc99e Initial load duke parents: diff changeset	395 // ensure no truncation occurs after the increment.
a61af66fc99e Initial load duke parents: diff changeset	396
a61af66fc99e Initial load duke parents: diff changeset	397 if (stride_con > 0) {
a61af66fc99e Initial load duke parents: diff changeset	398 if (iv_trunc_t->_hi - phi_ft->_hi < stride_con \|\|
a61af66fc99e Initial load duke parents: diff changeset	399 iv_trunc_t->_lo > phi_ft->_lo) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	400 return false; // truncation may occur
0 a61af66fc99e Initial load duke parents: diff changeset	401 }
a61af66fc99e Initial load duke parents: diff changeset	402 } else if (stride_con < 0) {
a61af66fc99e Initial load duke parents: diff changeset	403 if (iv_trunc_t->_lo - phi_ft->_lo > stride_con \|\|
a61af66fc99e Initial load duke parents: diff changeset	404 iv_trunc_t->_hi < phi_ft->_hi) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	405 return false; // truncation may occur
0 a61af66fc99e Initial load duke parents: diff changeset	406 }
a61af66fc99e Initial load duke parents: diff changeset	407 }
a61af66fc99e Initial load duke parents: diff changeset	408 // No possibility of wrap so truncation can be discarded
a61af66fc99e Initial load duke parents: diff changeset	409 // Promote iv type to Int
a61af66fc99e Initial load duke parents: diff changeset	410 } else {
a61af66fc99e Initial load duke parents: diff changeset	411 assert(trunc1 == NULL && trunc2 == NULL, "no truncation for int");
a61af66fc99e Initial load duke parents: diff changeset	412 }
a61af66fc99e Initial load duke parents: diff changeset	413
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	414 // If the condition is inverted and we will be rolling
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	415 // through MININT to MAXINT, then bail out.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	416 if (bt == BoolTest::eq \|\| // Bail out, but this loop trips at most twice!
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	417 // Odd stride
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	418 bt == BoolTest::ne && stride_con != 1 && stride_con != -1 \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	419 // Count down loop rolls through MAXINT
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	420 (bt == BoolTest::le \|\| bt == BoolTest::lt) && stride_con < 0 \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	421 // Count up loop rolls through MININT
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	422 (bt == BoolTest::ge \|\| bt == BoolTest::gt) && stride_con > 0) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	423 return false; // Bail out
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	424 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	425
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	426 const TypeInt* init_t = gvn->type(init_trip)->is_int();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	427 const TypeInt* limit_t = gvn->type(limit)->is_int();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	428
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	429 if (stride_con > 0) {
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	430 jlong init_p = (jlong)init_t->_lo + stride_con;
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	431 if (init_p > (jlong)max_jint \|\| init_p > (jlong)limit_t->_hi)
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	432 return false; // cyclic loop or this loop trips only once
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	433 } else {
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	434 jlong init_p = (jlong)init_t->_hi + stride_con;
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	435 if (init_p < (jlong)min_jint \|\| init_p < (jlong)limit_t->_lo)
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	436 return false; // cyclic loop or this loop trips only once
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	437 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	438
22842 0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	439 if (phi_incr != NULL) {
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	440 // check if there is a possiblity of IV overflowing after the first increment
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	441 if (stride_con > 0) {
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	442 if (init_t->_hi > max_jint - stride_con) {
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	443 return false;
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	444 }
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	445 } else {
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	446 if (init_t->_lo < min_jint - stride_con) {
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	447 return false;
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	448 }
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	449 }
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	450 }
0a5d68482373 8072753: Nondeterministic wrong answer on arithmetic iveresov parents: 17937 diff changeset	451
0 a61af66fc99e Initial load duke parents: diff changeset	452 // =================================================
a61af66fc99e Initial load duke parents: diff changeset	453 // ---- SUCCESS! Found A Trip-Counted Loop! -----
a61af66fc99e Initial load duke parents: diff changeset	454 //
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	455 assert(x->Opcode() == Op_Loop, "regular loops only");
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 8868 diff changeset	456 C->print_method(PHASE_BEFORE_CLOOPS, 3);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	457
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	458 Node *hook = new (C) Node(6);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	459
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	460 if (LoopLimitCheck) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	461
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	462 // ===================================================
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	463 // Generate loop limit check to avoid integer overflow
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	464 // in cases like next (cyclic loops):
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	465 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	466 // for (i=0; i <= max_jint; i++) {}
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	467 // for (i=0; i < max_jint; i+=2) {}
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	468 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	469 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	470 // Limit check predicate depends on the loop test:
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	471 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	472 // for(;i != limit; i++) --> limit <= (max_jint)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	473 // for(;i < limit; i+=stride) --> limit <= (max_jint - stride + 1)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	474 // for(;i <= limit; i+=stride) --> limit <= (max_jint - stride )
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	475 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	476
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	477 // Check if limit is excluded to do more precise int overflow check.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	478 bool incl_limit = (bt == BoolTest::le \|\| bt == BoolTest::ge);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	479 int stride_m = stride_con - (incl_limit ? 0 : (stride_con > 0 ? 1 : -1));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	480
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	481 // If compare points directly to the phi we need to adjust
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	482 // the compare so that it points to the incr. Limit have
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	483 // to be adjusted to keep trip count the same and the
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	484 // adjusted limit should be checked for int overflow.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	485 if (phi_incr != NULL) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	486 stride_m += stride_con;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	487 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	488
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	489 if (limit->is_Con()) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	490 int limit_con = limit->get_int();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	491 if ((stride_con > 0 && limit_con > (max_jint - stride_m)) \|\|
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	492 (stride_con < 0 && limit_con < (min_jint - stride_m))) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	493 // Bailout: it could be integer overflow.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	494 return false;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	495 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	496 } else if ((stride_con > 0 && limit_t->_hi <= (max_jint - stride_m)) \|\|
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	497 (stride_con < 0 && limit_t->_lo >= (min_jint - stride_m))) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	498 // Limit's type may satisfy the condition, for example,
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	499 // when it is an array length.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	500 } else {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	501 // Generate loop's limit check.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	502 // Loop limit check predicate should be near the loop.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	503 ProjNode *limit_check_proj = find_predicate_insertion_point(init_control, Deoptimization::Reason_loop_limit_check);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	504 if (!limit_check_proj) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	505 // The limit check predicate is not generated if this method trapped here before.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	506 #ifdef ASSERT
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	507 if (TraceLoopLimitCheck) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	508 tty->print("missing loop limit check:");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	509 loop->dump_head();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	510 x->dump(1);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	511 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	512 #endif
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	513 return false;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	514 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	515
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	516 IfNode* check_iff = limit_check_proj->in(0)->as_If();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	517 Node* cmp_limit;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	518 Node* bol;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	519
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	520 if (stride_con > 0) {
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	521 cmp_limit = new (C) CmpINode(limit, _igvn.intcon(max_jint - stride_m));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	522 bol = new (C) BoolNode(cmp_limit, BoolTest::le);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	523 } else {
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	524 cmp_limit = new (C) CmpINode(limit, _igvn.intcon(min_jint - stride_m));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	525 bol = new (C) BoolNode(cmp_limit, BoolTest::ge);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	526 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	527 cmp_limit = _igvn.register_new_node_with_optimizer(cmp_limit);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	528 bol = _igvn.register_new_node_with_optimizer(bol);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	529 set_subtree_ctrl(bol);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	530
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	531 // Replace condition in original predicate but preserve Opaque node
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	532 // so that previous predicates could be found.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	533 assert(check_iff->in(1)->Opcode() == Op_Conv2B &&
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	534 check_iff->in(1)->in(1)->Opcode() == Op_Opaque1, "");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	535 Node* opq = check_iff->in(1)->in(1);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	536 _igvn.hash_delete(opq);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	537 opq->set_req(1, bol);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	538 // Update ctrl.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	539 set_ctrl(opq, check_iff->in(0));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	540 set_ctrl(check_iff->in(1), check_iff->in(0));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	541
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	542 #ifndef PRODUCT
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	543 // report that the loop predication has been actually performed
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	544 // for this loop
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	545 if (TraceLoopLimitCheck) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	546 tty->print_cr("Counted Loop Limit Check generated:");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	547 debug_only( bol->dump(2); )
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	548 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	549 #endif
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	550 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	551
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	552 if (phi_incr != NULL) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	553 // If compare points directly to the phi we need to adjust
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	554 // the compare so that it points to the incr. Limit have
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	555 // to be adjusted to keep trip count the same and we
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	556 // should avoid int overflow.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	557 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	558 // i = init; do {} while(i++ < limit);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	559 // is converted to
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	560 // i = init; do {} while(++i < limit+1);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	561 //
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	562 limit = gvn->transform(new (C) AddINode(limit, stride));
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	563 }
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	564
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	565 // Now we need to canonicalize loop condition.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	566 if (bt == BoolTest::ne) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	567 assert(stride_con == 1 \|\| stride_con == -1, "simple increment only");
3782 aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	568 // 'ne' can be replaced with 'lt' only when init < limit.
aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	569 if (stride_con > 0 && init_t->_hi < limit_t->_lo)
aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	570 bt = BoolTest::lt;
aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	571 // 'ne' can be replaced with 'gt' only when init > limit.
aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	572 if (stride_con < 0 && init_t->_lo > limit_t->_hi)
aacaff365100 7052494: Eclipse test fails on JDK 7 b142 kvn parents: 3345 diff changeset	573 bt = BoolTest::gt;
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	574 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	575
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	576 if (incl_limit) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	577 // The limit check guaranties that 'limit <= (max_jint - stride)' so
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	578 // we can convert 'i <= limit' to 'i < limit+1' since stride != 0.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	579 //
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	580 Node* one = (stride_con > 0) ? gvn->intcon( 1) : gvn->intcon(-1);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	581 limit = gvn->transform(new (C) AddINode(limit, one));
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	582 if (bt == BoolTest::le)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	583 bt = BoolTest::lt;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	584 else if (bt == BoolTest::ge)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	585 bt = BoolTest::gt;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	586 else
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	587 ShouldNotReachHere();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	588 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	589 set_subtree_ctrl( limit );
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	590
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	591 } else { // LoopLimitCheck
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	592
0 a61af66fc99e Initial load duke parents: diff changeset	593 // If compare points to incr, we are ok. Otherwise the compare
a61af66fc99e Initial load duke parents: diff changeset	594 // can directly point to the phi; in this case adjust the compare so that
605 98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	595 // it points to the incr by adjusting the limit.
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	596 if (cmp->in(1) == phi \|\| cmp->in(2) == phi)
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	597 limit = gvn->transform(new (C) AddINode(limit,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	598
a61af66fc99e Initial load duke parents: diff changeset	599 // trip-count for +-tive stride should be: (limit - init_trip + stride - 1)/stride.
a61af66fc99e Initial load duke parents: diff changeset	600 // Final value for iterator should be: trip_count * stride + init_trip.
a61af66fc99e Initial load duke parents: diff changeset	601 Node *one_p = gvn->intcon( 1);
a61af66fc99e Initial load duke parents: diff changeset	602 Node *one_m = gvn->intcon(-1);
a61af66fc99e Initial load duke parents: diff changeset	603
a61af66fc99e Initial load duke parents: diff changeset	604 Node *trip_count = NULL;
a61af66fc99e Initial load duke parents: diff changeset	605 switch( bt ) {
a61af66fc99e Initial load duke parents: diff changeset	606 case BoolTest::eq:
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	607 ShouldNotReachHere();
0 a61af66fc99e Initial load duke parents: diff changeset	608 case BoolTest::ne: // Ahh, the case we desire
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	609 if (stride_con == 1)
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	610 trip_count = gvn->transform(new (C) SubINode(limit,init_trip));
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	611 else if (stride_con == -1)
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	612 trip_count = gvn->transform(new (C) SubINode(init_trip,limit));
0 a61af66fc99e Initial load duke parents: diff changeset	613 else
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	614 ShouldNotReachHere();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	615 set_subtree_ctrl(trip_count);
0 a61af66fc99e Initial load duke parents: diff changeset	616 //_loop.map(trip_count->_idx,loop(limit));
a61af66fc99e Initial load duke parents: diff changeset	617 break;
a61af66fc99e Initial load duke parents: diff changeset	618 case BoolTest::le: // Maybe convert to '<' case
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	619 limit = gvn->transform(new (C) AddINode(limit,one_p));
0 a61af66fc99e Initial load duke parents: diff changeset	620 set_subtree_ctrl( limit );
a61af66fc99e Initial load duke parents: diff changeset	621 hook->init_req(4, limit);
a61af66fc99e Initial load duke parents: diff changeset	622
a61af66fc99e Initial load duke parents: diff changeset	623 bt = BoolTest::lt;
a61af66fc99e Initial load duke parents: diff changeset	624 // Make the new limit be in the same loop nest as the old limit
a61af66fc99e Initial load duke parents: diff changeset	625 //_loop.map(limit->_idx,limit_loop);
a61af66fc99e Initial load duke parents: diff changeset	626 // Fall into next case
a61af66fc99e Initial load duke parents: diff changeset	627 case BoolTest::lt: { // Maybe convert to '!=' case
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	628 if (stride_con < 0) // Count down loop rolls through MAXINT
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	629 ShouldNotReachHere();
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	630 Node *range = gvn->transform(new (C) SubINode(limit,init_trip));
0 a61af66fc99e Initial load duke parents: diff changeset	631 set_subtree_ctrl( range );
a61af66fc99e Initial load duke parents: diff changeset	632 hook->init_req(0, range);
a61af66fc99e Initial load duke parents: diff changeset	633
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	634 Node *bias = gvn->transform(new (C) AddINode(range,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	635 set_subtree_ctrl( bias );
a61af66fc99e Initial load duke parents: diff changeset	636 hook->init_req(1, bias);
a61af66fc99e Initial load duke parents: diff changeset	637
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	638 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_m));
0 a61af66fc99e Initial load duke parents: diff changeset	639 set_subtree_ctrl( bias1 );
a61af66fc99e Initial load duke parents: diff changeset	640 hook->init_req(2, bias1);
a61af66fc99e Initial load duke parents: diff changeset	641
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	642 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	643 set_subtree_ctrl( trip_count );
a61af66fc99e Initial load duke parents: diff changeset	644 hook->init_req(3, trip_count);
a61af66fc99e Initial load duke parents: diff changeset	645 break;
a61af66fc99e Initial load duke parents: diff changeset	646 }
a61af66fc99e Initial load duke parents: diff changeset	647
a61af66fc99e Initial load duke parents: diff changeset	648 case BoolTest::ge: // Maybe convert to '>' case
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	649 limit = gvn->transform(new (C) AddINode(limit,one_m));
0 a61af66fc99e Initial load duke parents: diff changeset	650 set_subtree_ctrl( limit );
a61af66fc99e Initial load duke parents: diff changeset	651 hook->init_req(4 ,limit);
a61af66fc99e Initial load duke parents: diff changeset	652
a61af66fc99e Initial load duke parents: diff changeset	653 bt = BoolTest::gt;
a61af66fc99e Initial load duke parents: diff changeset	654 // Make the new limit be in the same loop nest as the old limit
a61af66fc99e Initial load duke parents: diff changeset	655 //_loop.map(limit->_idx,limit_loop);
a61af66fc99e Initial load duke parents: diff changeset	656 // Fall into next case
a61af66fc99e Initial load duke parents: diff changeset	657 case BoolTest::gt: { // Maybe convert to '!=' case
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	658 if (stride_con > 0) // count up loop rolls through MININT
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	659 ShouldNotReachHere();
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	660 Node *range = gvn->transform(new (C) SubINode(limit,init_trip));
0 a61af66fc99e Initial load duke parents: diff changeset	661 set_subtree_ctrl( range );
a61af66fc99e Initial load duke parents: diff changeset	662 hook->init_req(0, range);
a61af66fc99e Initial load duke parents: diff changeset	663
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	664 Node *bias = gvn->transform(new (C) AddINode(range,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	665 set_subtree_ctrl( bias );
a61af66fc99e Initial load duke parents: diff changeset	666 hook->init_req(1, bias);
a61af66fc99e Initial load duke parents: diff changeset	667
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	668 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_p));
0 a61af66fc99e Initial load duke parents: diff changeset	669 set_subtree_ctrl( bias1 );
a61af66fc99e Initial load duke parents: diff changeset	670 hook->init_req(2, bias1);
a61af66fc99e Initial load duke parents: diff changeset	671
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	672 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	673 set_subtree_ctrl( trip_count );
a61af66fc99e Initial load duke parents: diff changeset	674 hook->init_req(3, trip_count);
a61af66fc99e Initial load duke parents: diff changeset	675 break;
a61af66fc99e Initial load duke parents: diff changeset	676 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	677 } // switch( bt )
0 a61af66fc99e Initial load duke parents: diff changeset	678
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	679 Node *span = gvn->transform(new (C) MulINode(trip_count,stride));
0 a61af66fc99e Initial load duke parents: diff changeset	680 set_subtree_ctrl( span );
a61af66fc99e Initial load duke parents: diff changeset	681 hook->init_req(5, span);
a61af66fc99e Initial load duke parents: diff changeset	682
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	683 limit = gvn->transform(new (C) AddINode(span,init_trip));
0 a61af66fc99e Initial load duke parents: diff changeset	684 set_subtree_ctrl( limit );
a61af66fc99e Initial load duke parents: diff changeset	685
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	686 } // LoopLimitCheck
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	687
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	688 if (!UseCountedLoopSafepoints) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	689 // Check for SafePoint on backedge and remove
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	690 Node *sfpt = x->in(LoopNode::LoopBackControl);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	691 if (sfpt->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt)) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	692 lazy_replace( sfpt, iftrue );
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	693 if (loop->_safepts != NULL) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	694 loop->_safepts->yank(sfpt);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	695 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	696 loop->_tail = iftrue;
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	697 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	698 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	699
0 a61af66fc99e Initial load duke parents: diff changeset	700 // Build a canonical trip test.
a61af66fc99e Initial load duke parents: diff changeset	701 // Clone code, as old values may be in use.
a61af66fc99e Initial load duke parents: diff changeset	702 incr = incr->clone();
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	703 incr->set_req(1,phi);
0 a61af66fc99e Initial load duke parents: diff changeset	704 incr->set_req(2,stride);
a61af66fc99e Initial load duke parents: diff changeset	705 incr = _igvn.register_new_node_with_optimizer(incr);
a61af66fc99e Initial load duke parents: diff changeset	706 set_early_ctrl( incr );
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	707 _igvn.hash_delete(phi);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	708 phi->set_req_X( LoopNode::LoopBackControl, incr, &_igvn );
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	709
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	710 // If phi type is more restrictive than Int, raise to
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	711 // Int to prevent (almost) infinite recursion in igvn
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	712 // which can only handle integer types for constants or minint..maxint.
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	713 if (!TypeInt::INT->higher_equal(phi->bottom_type())) {
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	714 Node* nphi = PhiNode::make(phi->in(0), phi->in(LoopNode::EntryControl), TypeInt::INT);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	715 nphi->set_req(LoopNode::LoopBackControl, phi->in(LoopNode::LoopBackControl));
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	716 nphi = _igvn.register_new_node_with_optimizer(nphi);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	717 set_ctrl(nphi, get_ctrl(phi));
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	718 _igvn.replace_node(phi, nphi);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	719 phi = nphi->as_Phi();
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	720 }
0 a61af66fc99e Initial load duke parents: diff changeset	721 cmp = cmp->clone();
a61af66fc99e Initial load duke parents: diff changeset	722 cmp->set_req(1,incr);
a61af66fc99e Initial load duke parents: diff changeset	723 cmp->set_req(2,limit);
a61af66fc99e Initial load duke parents: diff changeset	724 cmp = _igvn.register_new_node_with_optimizer(cmp);
a61af66fc99e Initial load duke parents: diff changeset	725 set_ctrl(cmp, iff->in(0));
a61af66fc99e Initial load duke parents: diff changeset	726
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	727 test = test->clone()->as_Bool();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	728 ((BoolTest)&test->_test)._test = bt;
0 a61af66fc99e Initial load duke parents: diff changeset	729 test->set_req(1,cmp);
a61af66fc99e Initial load duke parents: diff changeset	730 _igvn.register_new_node_with_optimizer(test);
a61af66fc99e Initial load duke parents: diff changeset	731 set_ctrl(test, iff->in(0));
a61af66fc99e Initial load duke parents: diff changeset	732
a61af66fc99e Initial load duke parents: diff changeset	733 // Replace the old IfNode with a new LoopEndNode
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	734 Node *lex = _igvn.register_new_node_with_optimizer(new (C) CountedLoopEndNode( iff->in(0), test, cl_prob, iff->as_If()->_fcnt ));
0 a61af66fc99e Initial load duke parents: diff changeset	735 IfNode *le = lex->as_If();
a61af66fc99e Initial load duke parents: diff changeset	736 uint dd = dom_depth(iff);
a61af66fc99e Initial load duke parents: diff changeset	737 set_idom(le, le->in(0), dd); // Update dominance for loop exit
a61af66fc99e Initial load duke parents: diff changeset	738 set_loop(le, loop);
a61af66fc99e Initial load duke parents: diff changeset	739
a61af66fc99e Initial load duke parents: diff changeset	740 // Get the loop-exit control
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	741 Node *iffalse = iff->as_If()->proj_out(!(iftrue_op == Op_IfTrue));
0 a61af66fc99e Initial load duke parents: diff changeset	742
a61af66fc99e Initial load duke parents: diff changeset	743 // Need to swap loop-exit and loop-back control?
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	744 if (iftrue_op == Op_IfFalse) {
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	745 Node *ift2=_igvn.register_new_node_with_optimizer(new (C) IfTrueNode (le));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	746 Node *iff2=_igvn.register_new_node_with_optimizer(new (C) IfFalseNode(le));
0 a61af66fc99e Initial load duke parents: diff changeset	747
a61af66fc99e Initial load duke parents: diff changeset	748 loop->_tail = back_control = ift2;
a61af66fc99e Initial load duke parents: diff changeset	749 set_loop(ift2, loop);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	750 set_loop(iff2, get_loop(iffalse));
0 a61af66fc99e Initial load duke parents: diff changeset	751
a61af66fc99e Initial load duke parents: diff changeset	752 // Lazy update of 'get_ctrl' mechanism.
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	753 lazy_replace_proj( iffalse, iff2 );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	754 lazy_replace_proj( iftrue, ift2 );
0 a61af66fc99e Initial load duke parents: diff changeset	755
a61af66fc99e Initial load duke parents: diff changeset	756 // Swap names
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	757 iffalse = iff2;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	758 iftrue = ift2;
0 a61af66fc99e Initial load duke parents: diff changeset	759 } else {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	760 _igvn.hash_delete(iffalse);
0 a61af66fc99e Initial load duke parents: diff changeset	761 _igvn.hash_delete(iftrue);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	762 iffalse->set_req_X( 0, le, &_igvn );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	763 iftrue ->set_req_X( 0, le, &_igvn );
0 a61af66fc99e Initial load duke parents: diff changeset	764 }
a61af66fc99e Initial load duke parents: diff changeset	765
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	766 set_idom(iftrue, le, dd+1);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	767 set_idom(iffalse, le, dd+1);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	768 assert(iff->outcnt() == 0, "should be dead now");
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	769 lazy_replace( iff, le ); // fix 'get_ctrl'
0 a61af66fc99e Initial load duke parents: diff changeset	770
a61af66fc99e Initial load duke parents: diff changeset	771 // Now setup a new CountedLoopNode to replace the existing LoopNode
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	772 CountedLoopNode *l = new (C) CountedLoopNode(init_control, back_control);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	773 l->set_unswitch_count(x->as_Loop()->unswitch_count()); // Preserve
0 a61af66fc99e Initial load duke parents: diff changeset	774 // The following assert is approximately true, and defines the intention
a61af66fc99e Initial load duke parents: diff changeset	775 // of can_be_counted_loop. It fails, however, because phase->type
a61af66fc99e Initial load duke parents: diff changeset	776 // is not yet initialized for this loop and its parts.
a61af66fc99e Initial load duke parents: diff changeset	777 //assert(l->can_be_counted_loop(this), "sanity");
a61af66fc99e Initial load duke parents: diff changeset	778 _igvn.register_new_node_with_optimizer(l);
a61af66fc99e Initial load duke parents: diff changeset	779 set_loop(l, loop);
a61af66fc99e Initial load duke parents: diff changeset	780 loop->_head = l;
a61af66fc99e Initial load duke parents: diff changeset	781 // Fix all data nodes placed at the old loop head.
a61af66fc99e Initial load duke parents: diff changeset	782 // Uses the lazy-update mechanism of 'get_ctrl'.
a61af66fc99e Initial load duke parents: diff changeset	783 lazy_replace( x, l );
a61af66fc99e Initial load duke parents: diff changeset	784 set_idom(l, init_control, dom_depth(x));
a61af66fc99e Initial load duke parents: diff changeset	785
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	786 if (!UseCountedLoopSafepoints) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	787 // Check for immediately preceding SafePoint and remove
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	788 Node *sfpt2 = le->in(0);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	789 if (sfpt2->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt2)) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	790 lazy_replace( sfpt2, sfpt2->in(TypeFunc::Control));
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	791 if (loop->_safepts != NULL) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	792 loop->_safepts->yank(sfpt2);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	793 }
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	794 }
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	795 }
0 a61af66fc99e Initial load duke parents: diff changeset	796
a61af66fc99e Initial load duke parents: diff changeset	797 // Free up intermediate goo
a61af66fc99e Initial load duke parents: diff changeset	798 _igvn.remove_dead_node(hook);
a61af66fc99e Initial load duke parents: diff changeset	799
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	800 #ifdef ASSERT
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	801 assert(l->is_valid_counted_loop(), "counted loop shape is messed up");
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	802 assert(l == loop->_head && l->phi() == phi && l->loopexit() == lex, "" );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	803 #endif
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	804 #ifndef PRODUCT
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	805 if (TraceLoopOpts) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	806 tty->print("Counted ");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	807 loop->dump_head();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	808 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	809 #endif
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	810
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 8868 diff changeset	811 C->print_method(PHASE_AFTER_CLOOPS, 3);
0 a61af66fc99e Initial load duke parents: diff changeset	812
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	813 return true;
0 a61af66fc99e Initial load duke parents: diff changeset	814 }
a61af66fc99e Initial load duke parents: diff changeset	815
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	816 //----------------------exact_limit-------------------------------------------
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	817 Node* PhaseIdealLoop::exact_limit( IdealLoopTree *loop ) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	818 assert(loop->_head->is_CountedLoop(), "");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	819 CountedLoopNode *cl = loop->_head->as_CountedLoop();
3850 6987871cfb9b 7077439: Possible reference through NULL in loopPredicate.cpp:726 kvn parents: 3845 diff changeset	820 assert(cl->is_valid_counted_loop(), "");
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	821
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	822 if (!LoopLimitCheck \|\| ABS(cl->stride_con()) == 1 \|\|
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	823 cl->limit()->Opcode() == Op_LoopLimit) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	824 // Old code has exact limit (it could be incorrect in case of int overflow).
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	825 // Loop limit is exact with stride == 1. And loop may already have exact limit.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	826 return cl->limit();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	827 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	828 Node *limit = NULL;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	829 #ifdef ASSERT
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	830 BoolTest::mask bt = cl->loopexit()->test_trip();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	831 assert(bt == BoolTest::lt \|\| bt == BoolTest::gt, "canonical test is expected");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	832 #endif
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	833 if (cl->has_exact_trip_count()) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	834 // Simple case: loop has constant boundaries.
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	835 // Use jlongs to avoid integer overflow.
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	836 int stride_con = cl->stride_con();
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	837 jlong init_con = cl->init_trip()->get_int();
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	838 jlong limit_con = cl->limit()->get_int();
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	839 julong trip_cnt = cl->trip_count();
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	840 jlong final_con = init_con + trip_cnt*stride_con;
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	841 int final_int = (int)final_con;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	842 // The final value should be in integer range since the loop
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	843 // is counted and the limit was checked for overflow.
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	844 assert(final_con == (jlong)final_int, "final value should be integer");
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	845 limit = _igvn.intcon(final_int);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	846 } else {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	847 // Create new LoopLimit node to get exact limit (final iv value).
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	848 limit = new (C) LoopLimitNode(C, cl->init_trip(), cl->limit(), cl->stride());
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	849 register_new_node(limit, cl->in(LoopNode::EntryControl));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	850 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	851 assert(limit != NULL, "sanity");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	852 return limit;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	853 }
0 a61af66fc99e Initial load duke parents: diff changeset	854
a61af66fc99e Initial load duke parents: diff changeset	855 //------------------------------Ideal------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	856 // Return a node which is more "ideal" than the current node.
a61af66fc99e Initial load duke parents: diff changeset	857 // Attempt to convert into a counted-loop.
a61af66fc99e Initial load duke parents: diff changeset	858 Node LoopNode::Ideal(PhaseGVN phase, bool can_reshape) {
a61af66fc99e Initial load duke parents: diff changeset	859 if (!can_be_counted_loop(phase)) {
a61af66fc99e Initial load duke parents: diff changeset	860 phase->C->set_major_progress();
a61af66fc99e Initial load duke parents: diff changeset	861 }
a61af66fc99e Initial load duke parents: diff changeset	862 return RegionNode::Ideal(phase, can_reshape);
a61af66fc99e Initial load duke parents: diff changeset	863 }
a61af66fc99e Initial load duke parents: diff changeset	864
a61af66fc99e Initial load duke parents: diff changeset	865
a61af66fc99e Initial load duke parents: diff changeset	866 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	867 //------------------------------Ideal------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	868 // Return a node which is more "ideal" than the current node.
a61af66fc99e Initial load duke parents: diff changeset	869 // Attempt to convert into a counted-loop.
a61af66fc99e Initial load duke parents: diff changeset	870 Node CountedLoopNode::Ideal(PhaseGVN phase, bool can_reshape) {
a61af66fc99e Initial load duke parents: diff changeset	871 return RegionNode::Ideal(phase, can_reshape);
a61af66fc99e Initial load duke parents: diff changeset	872 }
a61af66fc99e Initial load duke parents: diff changeset	873
a61af66fc99e Initial load duke parents: diff changeset	874 //------------------------------dump_spec--------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	875 // Dump special per-node info
a61af66fc99e Initial load duke parents: diff changeset	876 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	877 void CountedLoopNode::dump_spec(outputStream *st) const {
a61af66fc99e Initial load duke parents: diff changeset	878 LoopNode::dump_spec(st);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	879 if (stride_is_con()) {
0 a61af66fc99e Initial load duke parents: diff changeset	880 st->print("stride: %d ",stride_con());
a61af66fc99e Initial load duke parents: diff changeset	881 }
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	882 if (is_pre_loop ()) st->print("pre of N%d" , _main_idx);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	883 if (is_main_loop()) st->print("main of N%d", _idx);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	884 if (is_post_loop()) st->print("post of N%d", _main_idx);
0 a61af66fc99e Initial load duke parents: diff changeset	885 }
a61af66fc99e Initial load duke parents: diff changeset	886 #endif
a61af66fc99e Initial load duke parents: diff changeset	887
a61af66fc99e Initial load duke parents: diff changeset	888 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	889 int CountedLoopEndNode::stride_con() const {
a61af66fc99e Initial load duke parents: diff changeset	890 return stride()->bottom_type()->is_int()->get_con();
a61af66fc99e Initial load duke parents: diff changeset	891 }
a61af66fc99e Initial load duke parents: diff changeset	892
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	893 //=============================================================================
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	894 //------------------------------Value-----------------------------------------
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	895 const Type LoopLimitNode::Value( PhaseTransform phase ) const {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	896 const Type* init_t = phase->type(in(Init));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	897 const Type* limit_t = phase->type(in(Limit));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	898 const Type* stride_t = phase->type(in(Stride));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	899 // Either input is TOP ==> the result is TOP
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	900 if (init_t == Type::TOP) return Type::TOP;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	901 if (limit_t == Type::TOP) return Type::TOP;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	902 if (stride_t == Type::TOP) return Type::TOP;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	903
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	904 int stride_con = stride_t->is_int()->get_con();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	905 if (stride_con == 1)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	906 return NULL; // Identity
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	907
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	908 if (init_t->is_int()->is_con() && limit_t->is_int()->is_con()) {
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	909 // Use jlongs to avoid integer overflow.
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	910 jlong init_con = init_t->is_int()->get_con();
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	911 jlong limit_con = limit_t->is_int()->get_con();
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	912 int stride_m = stride_con - (stride_con > 0 ? 1 : -1);
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	913 jlong trip_count = (limit_con - init_con + stride_m)/stride_con;
377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	914 jlong final_con = init_con + stride_con*trip_count;
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	915 int final_int = (int)final_con;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	916 // The final value should be in integer range since the loop
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	917 // is counted and the limit was checked for overflow.
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	918 assert(final_con == (jlong)final_int, "final value should be integer");
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	919 return TypeInt::make(final_int);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	920 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	921
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	922 return bottom_type(); // TypeInt::INT
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	923 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	924
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	925 //------------------------------Ideal------------------------------------------
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	926 // Return a node which is more "ideal" than the current node.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	927 Node LoopLimitNode::Ideal(PhaseGVN phase, bool can_reshape) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	928 if (phase->type(in(Init)) == Type::TOP \|\|
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	929 phase->type(in(Limit)) == Type::TOP \|\|
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	930 phase->type(in(Stride)) == Type::TOP)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	931 return NULL; // Dead
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	932
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	933 int stride_con = phase->type(in(Stride))->is_int()->get_con();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	934 if (stride_con == 1)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	935 return NULL; // Identity
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	936
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	937 if (in(Init)->is_Con() && in(Limit)->is_Con())
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	938 return NULL; // Value
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	939
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	940 // Delay following optimizations until all loop optimizations
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	941 // done to keep Ideal graph simple.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	942 if (!can_reshape \|\| phase->C->major_progress())
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	943 return NULL;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	944
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	945 const TypeInt* init_t = phase->type(in(Init) )->is_int();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	946 const TypeInt* limit_t = phase->type(in(Limit))->is_int();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	947 int stride_p;
6846 377508648226 8000313: C2 should use jlong for 64bit values vlivanov parents: 6804 diff changeset	948 jlong lim, ini;
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	949 julong max;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	950 if (stride_con > 0) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	951 stride_p = stride_con;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	952 lim = limit_t->_hi;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	953 ini = init_t->_lo;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	954 max = (julong)max_jint;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	955 } else {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	956 stride_p = -stride_con;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	957 lim = init_t->_hi;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	958 ini = limit_t->_lo;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	959 max = (julong)min_jint;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	960 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	961 julong range = lim - ini + stride_p;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	962 if (range <= max) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	963 // Convert to integer expression if it is not overflow.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	964 Node* stride_m = phase->intcon(stride_con - (stride_con > 0 ? 1 : -1));
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	965 Node *range = phase->transform(new (phase->C) SubINode(in(Limit), in(Init)));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	966 Node *bias = phase->transform(new (phase->C) AddINode(range, stride_m));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	967 Node *trip = phase->transform(new (phase->C) DivINode(0, bias, in(Stride)));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	968 Node *span = phase->transform(new (phase->C) MulINode(trip, in(Stride)));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	969 return new (phase->C) AddINode(span, in(Init)); // exact limit
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	970 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	971
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	972 if (is_power_of_2(stride_p) \|\| // divisor is 2^n
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	973 !Matcher::has_match_rule(Op_LoopLimit)) { // or no specialized Mach node?
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	974 // Convert to long expression to avoid integer overflow
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	975 // and let igvn optimizer convert this division.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	976 //
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	977 Node* init = phase->transform( new (phase->C) ConvI2LNode(in(Init)));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	978 Node* limit = phase->transform( new (phase->C) ConvI2LNode(in(Limit)));
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	979 Node* stride = phase->longcon(stride_con);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	980 Node* stride_m = phase->longcon(stride_con - (stride_con > 0 ? 1 : -1));
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	981
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	982 Node *range = phase->transform(new (phase->C) SubLNode(limit, init));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	983 Node *bias = phase->transform(new (phase->C) AddLNode(range, stride_m));
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	984 Node *span;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	985 if (stride_con > 0 && is_power_of_2(stride_p)) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	986 // bias >= 0 if stride >0, so if stride is 2^n we can use &(-stride)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	987 // and avoid generating rounding for division. Zero trip guard should
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	988 // guarantee that init < limit but sometimes the guard is missing and
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	989 // we can get situation when init > limit. Note, for the empty loop
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	990 // optimization zero trip guard is generated explicitly which leaves
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	991 // only RCE predicate where exact limit is used and the predicate
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	992 // will simply fail forcing recompilation.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	993 Node* neg_stride = phase->longcon(-stride_con);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	994 span = phase->transform(new (phase->C) AndLNode(bias, neg_stride));
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	995 } else {
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	996 Node *trip = phase->transform(new (phase->C) DivLNode(0, bias, stride));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	997 span = phase->transform(new (phase->C) MulLNode(trip, stride));
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	998 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	999 // Convert back to int
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1000 Node *span_int = phase->transform(new (phase->C) ConvL2INode(span));
e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1001 return new (phase->C) AddINode(span_int, in(Init)); // exact limit
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1002 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1003
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1004 return NULL; // No progress
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1005 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1006
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1007 //------------------------------Identity---------------------------------------
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1008 // If stride == 1 return limit node.
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1009 Node LoopLimitNode::Identity( PhaseTransform phase ) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1010 int stride_con = phase->type(in(Stride))->is_int()->get_con();
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1011 if (stride_con == 1 \|\| stride_con == -1)
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1012 return in(Limit);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1013 return this;
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1014 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1015
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1016 //=============================================================================
0 a61af66fc99e Initial load duke parents: diff changeset	1017 //----------------------match_incr_with_optional_truncation--------------------
a61af66fc99e Initial load duke parents: diff changeset	1018 // Match increment with optional truncation:
a61af66fc99e Initial load duke parents: diff changeset	1019 // CHAR: (i+1)&0x7fff, BYTE: ((i+1)<<8)>>8, or SHORT: ((i+1)<<16)>>16
a61af66fc99e Initial load duke parents: diff changeset	1020 // Return NULL for failure. Success returns the increment node.
a61af66fc99e Initial load duke parents: diff changeset	1021 Node* CountedLoopNode::match_incr_with_optional_truncation(
a61af66fc99e Initial load duke parents: diff changeset	1022 Node* expr, Node trunc1, Node trunc2, const TypeInt** trunc_type) {
a61af66fc99e Initial load duke parents: diff changeset	1023 // Quick cutouts:
4862 f457154eee8b 7140882: Don't return booleans from methods returning pointers brutisso parents: 4779 diff changeset	1024 if (expr == NULL \|\| expr->req() != 3) return NULL;
0 a61af66fc99e Initial load duke parents: diff changeset	1025
a61af66fc99e Initial load duke parents: diff changeset	1026 Node *t1 = NULL;
a61af66fc99e Initial load duke parents: diff changeset	1027 Node *t2 = NULL;
a61af66fc99e Initial load duke parents: diff changeset	1028 const TypeInt* trunc_t = TypeInt::INT;
a61af66fc99e Initial load duke parents: diff changeset	1029 Node* n1 = expr;
a61af66fc99e Initial load duke parents: diff changeset	1030 int n1op = n1->Opcode();
a61af66fc99e Initial load duke parents: diff changeset	1031
a61af66fc99e Initial load duke parents: diff changeset	1032 // Try to strip (n1 & M) or (n1 << N >> N) from n1.
a61af66fc99e Initial load duke parents: diff changeset	1033 if (n1op == Op_AndI &&
a61af66fc99e Initial load duke parents: diff changeset	1034 n1->in(2)->is_Con() &&
a61af66fc99e Initial load duke parents: diff changeset	1035 n1->in(2)->bottom_type()->is_int()->get_con() == 0x7fff) {
a61af66fc99e Initial load duke parents: diff changeset	1036 // %%% This check should match any mask of 2**K-1.
a61af66fc99e Initial load duke parents: diff changeset	1037 t1 = n1;
a61af66fc99e Initial load duke parents: diff changeset	1038 n1 = t1->in(1);
a61af66fc99e Initial load duke parents: diff changeset	1039 n1op = n1->Opcode();
a61af66fc99e Initial load duke parents: diff changeset	1040 trunc_t = TypeInt::CHAR;
a61af66fc99e Initial load duke parents: diff changeset	1041 } else if (n1op == Op_RShiftI &&
a61af66fc99e Initial load duke parents: diff changeset	1042 n1->in(1) != NULL &&
a61af66fc99e Initial load duke parents: diff changeset	1043 n1->in(1)->Opcode() == Op_LShiftI &&
a61af66fc99e Initial load duke parents: diff changeset	1044 n1->in(2) == n1->in(1)->in(2) &&
a61af66fc99e Initial load duke parents: diff changeset	1045 n1->in(2)->is_Con()) {
a61af66fc99e Initial load duke parents: diff changeset	1046 jint shift = n1->in(2)->bottom_type()->is_int()->get_con();
a61af66fc99e Initial load duke parents: diff changeset	1047 // %%% This check should match any shift in [1..31].
a61af66fc99e Initial load duke parents: diff changeset	1048 if (shift == 16 \|\| shift == 8) {
a61af66fc99e Initial load duke parents: diff changeset	1049 t1 = n1;
a61af66fc99e Initial load duke parents: diff changeset	1050 t2 = t1->in(1);
a61af66fc99e Initial load duke parents: diff changeset	1051 n1 = t2->in(1);
a61af66fc99e Initial load duke parents: diff changeset	1052 n1op = n1->Opcode();
a61af66fc99e Initial load duke parents: diff changeset	1053 if (shift == 16) {
a61af66fc99e Initial load duke parents: diff changeset	1054 trunc_t = TypeInt::SHORT;
a61af66fc99e Initial load duke parents: diff changeset	1055 } else if (shift == 8) {
a61af66fc99e Initial load duke parents: diff changeset	1056 trunc_t = TypeInt::BYTE;
a61af66fc99e Initial load duke parents: diff changeset	1057 }
a61af66fc99e Initial load duke parents: diff changeset	1058 }
a61af66fc99e Initial load duke parents: diff changeset	1059 }
a61af66fc99e Initial load duke parents: diff changeset	1060
a61af66fc99e Initial load duke parents: diff changeset	1061 // If (maybe after stripping) it is an AddI, we won:
a61af66fc99e Initial load duke parents: diff changeset	1062 if (n1op == Op_AddI) {
a61af66fc99e Initial load duke parents: diff changeset	1063 *trunc1 = t1;
a61af66fc99e Initial load duke parents: diff changeset	1064 *trunc2 = t2;
a61af66fc99e Initial load duke parents: diff changeset	1065 *trunc_type = trunc_t;
a61af66fc99e Initial load duke parents: diff changeset	1066 return n1;
a61af66fc99e Initial load duke parents: diff changeset	1067 }
a61af66fc99e Initial load duke parents: diff changeset	1068
a61af66fc99e Initial load duke parents: diff changeset	1069 // failed
a61af66fc99e Initial load duke parents: diff changeset	1070 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	1071 }
a61af66fc99e Initial load duke parents: diff changeset	1072
a61af66fc99e Initial load duke parents: diff changeset	1073
a61af66fc99e Initial load duke parents: diff changeset	1074 //------------------------------filtered_type--------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1075 // Return a type based on condition control flow
a61af66fc99e Initial load duke parents: diff changeset	1076 // A successful return will be a type that is restricted due
a61af66fc99e Initial load duke parents: diff changeset	1077 // to a series of dominating if-tests, such as:
a61af66fc99e Initial load duke parents: diff changeset	1078 // if (i < 10) {
a61af66fc99e Initial load duke parents: diff changeset	1079 // if (i > 0) {
a61af66fc99e Initial load duke parents: diff changeset	1080 // here: "i" type is [1..10)
a61af66fc99e Initial load duke parents: diff changeset	1081 // }
a61af66fc99e Initial load duke parents: diff changeset	1082 // }
a61af66fc99e Initial load duke parents: diff changeset	1083 // or a control flow merge
a61af66fc99e Initial load duke parents: diff changeset	1084 // if (i < 10) {
a61af66fc99e Initial load duke parents: diff changeset	1085 // do {
a61af66fc99e Initial load duke parents: diff changeset	1086 // phi( , ) -- at top of loop type is [min_int..10)
a61af66fc99e Initial load duke parents: diff changeset	1087 // i = ?
a61af66fc99e Initial load duke parents: diff changeset	1088 // } while ( i < 10)
a61af66fc99e Initial load duke parents: diff changeset	1089 //
a61af66fc99e Initial load duke parents: diff changeset	1090 const TypeInt* PhaseIdealLoop::filtered_type( Node n, Node n_ctrl) {
a61af66fc99e Initial load duke parents: diff changeset	1091 assert(n && n->bottom_type()->is_int(), "must be int");
a61af66fc99e Initial load duke parents: diff changeset	1092 const TypeInt* filtered_t = NULL;
a61af66fc99e Initial load duke parents: diff changeset	1093 if (!n->is_Phi()) {
a61af66fc99e Initial load duke parents: diff changeset	1094 assert(n_ctrl != NULL \|\| n_ctrl == C->top(), "valid control");
a61af66fc99e Initial load duke parents: diff changeset	1095 filtered_t = filtered_type_from_dominators(n, n_ctrl);
a61af66fc99e Initial load duke parents: diff changeset	1096
a61af66fc99e Initial load duke parents: diff changeset	1097 } else {
a61af66fc99e Initial load duke parents: diff changeset	1098 Node* phi = n->as_Phi();
a61af66fc99e Initial load duke parents: diff changeset	1099 Node* region = phi->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1100 assert(n_ctrl == NULL \|\| n_ctrl == region, "ctrl parameter must be region");
a61af66fc99e Initial load duke parents: diff changeset	1101 if (region && region != C->top()) {
a61af66fc99e Initial load duke parents: diff changeset	1102 for (uint i = 1; i < phi->req(); i++) {
a61af66fc99e Initial load duke parents: diff changeset	1103 Node* val = phi->in(i);
a61af66fc99e Initial load duke parents: diff changeset	1104 Node* use_c = region->in(i);
a61af66fc99e Initial load duke parents: diff changeset	1105 const TypeInt* val_t = filtered_type_from_dominators(val, use_c);
a61af66fc99e Initial load duke parents: diff changeset	1106 if (val_t != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1107 if (filtered_t == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1108 filtered_t = val_t;
a61af66fc99e Initial load duke parents: diff changeset	1109 } else {
a61af66fc99e Initial load duke parents: diff changeset	1110 filtered_t = filtered_t->meet(val_t)->is_int();
a61af66fc99e Initial load duke parents: diff changeset	1111 }
a61af66fc99e Initial load duke parents: diff changeset	1112 }
a61af66fc99e Initial load duke parents: diff changeset	1113 }
a61af66fc99e Initial load duke parents: diff changeset	1114 }
a61af66fc99e Initial load duke parents: diff changeset	1115 }
a61af66fc99e Initial load duke parents: diff changeset	1116 const TypeInt* n_t = _igvn.type(n)->is_int();
a61af66fc99e Initial load duke parents: diff changeset	1117 if (filtered_t != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1118 n_t = n_t->join(filtered_t)->is_int();
a61af66fc99e Initial load duke parents: diff changeset	1119 }
a61af66fc99e Initial load duke parents: diff changeset	1120 return n_t;
a61af66fc99e Initial load duke parents: diff changeset	1121 }
a61af66fc99e Initial load duke parents: diff changeset	1122
a61af66fc99e Initial load duke parents: diff changeset	1123
a61af66fc99e Initial load duke parents: diff changeset	1124 //------------------------------filtered_type_from_dominators--------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1125 // Return a possibly more restrictive type for val based on condition control flow of dominators
a61af66fc99e Initial load duke parents: diff changeset	1126 const TypeInt* PhaseIdealLoop::filtered_type_from_dominators( Node* val, Node *use_ctrl) {
a61af66fc99e Initial load duke parents: diff changeset	1127 if (val->is_Con()) {
a61af66fc99e Initial load duke parents: diff changeset	1128 return val->bottom_type()->is_int();
a61af66fc99e Initial load duke parents: diff changeset	1129 }
a61af66fc99e Initial load duke parents: diff changeset	1130 uint if_limit = 10; // Max number of dominating if's visited
a61af66fc99e Initial load duke parents: diff changeset	1131 const TypeInt* rtn_t = NULL;
a61af66fc99e Initial load duke parents: diff changeset	1132
a61af66fc99e Initial load duke parents: diff changeset	1133 if (use_ctrl && use_ctrl != C->top()) {
a61af66fc99e Initial load duke parents: diff changeset	1134 Node* val_ctrl = get_ctrl(val);
a61af66fc99e Initial load duke parents: diff changeset	1135 uint val_dom_depth = dom_depth(val_ctrl);
a61af66fc99e Initial load duke parents: diff changeset	1136 Node* pred = use_ctrl;
a61af66fc99e Initial load duke parents: diff changeset	1137 uint if_cnt = 0;
a61af66fc99e Initial load duke parents: diff changeset	1138 while (if_cnt < if_limit) {
a61af66fc99e Initial load duke parents: diff changeset	1139 if ((pred->Opcode() == Op_IfTrue \|\| pred->Opcode() == Op_IfFalse)) {
a61af66fc99e Initial load duke parents: diff changeset	1140 if_cnt++;
17 ff5961f4c095 6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long) never parents: 0 diff changeset	1141 const TypeInt* if_t = IfNode::filtered_int_type(&_igvn, val, pred);
0 a61af66fc99e Initial load duke parents: diff changeset	1142 if (if_t != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1143 if (rtn_t == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1144 rtn_t = if_t;
a61af66fc99e Initial load duke parents: diff changeset	1145 } else {
a61af66fc99e Initial load duke parents: diff changeset	1146 rtn_t = rtn_t->join(if_t)->is_int();
a61af66fc99e Initial load duke parents: diff changeset	1147 }
a61af66fc99e Initial load duke parents: diff changeset	1148 }
a61af66fc99e Initial load duke parents: diff changeset	1149 }
a61af66fc99e Initial load duke parents: diff changeset	1150 pred = idom(pred);
a61af66fc99e Initial load duke parents: diff changeset	1151 if (pred == NULL \|\| pred == C->top()) {
a61af66fc99e Initial load duke parents: diff changeset	1152 break;
a61af66fc99e Initial load duke parents: diff changeset	1153 }
a61af66fc99e Initial load duke parents: diff changeset	1154 // Stop if going beyond definition block of val
a61af66fc99e Initial load duke parents: diff changeset	1155 if (dom_depth(pred) < val_dom_depth) {
a61af66fc99e Initial load duke parents: diff changeset	1156 break;
a61af66fc99e Initial load duke parents: diff changeset	1157 }
a61af66fc99e Initial load duke parents: diff changeset	1158 }
a61af66fc99e Initial load duke parents: diff changeset	1159 }
a61af66fc99e Initial load duke parents: diff changeset	1160 return rtn_t;
a61af66fc99e Initial load duke parents: diff changeset	1161 }
a61af66fc99e Initial load duke parents: diff changeset	1162
a61af66fc99e Initial load duke parents: diff changeset	1163
a61af66fc99e Initial load duke parents: diff changeset	1164 //------------------------------dump_spec--------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1165 // Dump special per-node info
a61af66fc99e Initial load duke parents: diff changeset	1166 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	1167 void CountedLoopEndNode::dump_spec(outputStream *st) const {
a61af66fc99e Initial load duke parents: diff changeset	1168 if( in(TestValue)->is_Bool() ) {
a61af66fc99e Initial load duke parents: diff changeset	1169 BoolTest bt( test_trip()); // Added this for g++.
a61af66fc99e Initial load duke parents: diff changeset	1170
a61af66fc99e Initial load duke parents: diff changeset	1171 st->print("[");
a61af66fc99e Initial load duke parents: diff changeset	1172 bt.dump_on(st);
a61af66fc99e Initial load duke parents: diff changeset	1173 st->print("]");
a61af66fc99e Initial load duke parents: diff changeset	1174 }
a61af66fc99e Initial load duke parents: diff changeset	1175 st->print(" ");
a61af66fc99e Initial load duke parents: diff changeset	1176 IfNode::dump_spec(st);
a61af66fc99e Initial load duke parents: diff changeset	1177 }
a61af66fc99e Initial load duke parents: diff changeset	1178 #endif
a61af66fc99e Initial load duke parents: diff changeset	1179
a61af66fc99e Initial load duke parents: diff changeset	1180 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	1181 //------------------------------is_member--------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1182 // Is 'l' a member of 'this'?
a61af66fc99e Initial load duke parents: diff changeset	1183 int IdealLoopTree::is_member( const IdealLoopTree *l ) const {
a61af66fc99e Initial load duke parents: diff changeset	1184 while( l->_nest > _nest ) l = l->_parent;
a61af66fc99e Initial load duke parents: diff changeset	1185 return l == this;
a61af66fc99e Initial load duke parents: diff changeset	1186 }
a61af66fc99e Initial load duke parents: diff changeset	1187
a61af66fc99e Initial load duke parents: diff changeset	1188 //------------------------------set_nest---------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1189 // Set loop tree nesting depth. Accumulate _has_call bits.
a61af66fc99e Initial load duke parents: diff changeset	1190 int IdealLoopTree::set_nest( uint depth ) {
a61af66fc99e Initial load duke parents: diff changeset	1191 _nest = depth;
a61af66fc99e Initial load duke parents: diff changeset	1192 int bits = _has_call;
a61af66fc99e Initial load duke parents: diff changeset	1193 if( _child ) bits \|= _child->set_nest(depth+1);
a61af66fc99e Initial load duke parents: diff changeset	1194 if( bits ) _has_call = 1;
a61af66fc99e Initial load duke parents: diff changeset	1195 if( _next ) bits \|= _next ->set_nest(depth );
a61af66fc99e Initial load duke parents: diff changeset	1196 return bits;
a61af66fc99e Initial load duke parents: diff changeset	1197 }
a61af66fc99e Initial load duke parents: diff changeset	1198
a61af66fc99e Initial load duke parents: diff changeset	1199 //------------------------------split_fall_in----------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1200 // Split out multiple fall-in edges from the loop header. Move them to a
a61af66fc99e Initial load duke parents: diff changeset	1201 // private RegionNode before the loop. This becomes the loop landing pad.
a61af66fc99e Initial load duke parents: diff changeset	1202 void IdealLoopTree::split_fall_in( PhaseIdealLoop *phase, int fall_in_cnt ) {
a61af66fc99e Initial load duke parents: diff changeset	1203 PhaseIterGVN &igvn = phase->_igvn;
a61af66fc99e Initial load duke parents: diff changeset	1204 uint i;
a61af66fc99e Initial load duke parents: diff changeset	1205
a61af66fc99e Initial load duke parents: diff changeset	1206 // Make a new RegionNode to be the landing pad.
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1207 Node *landing_pad = new (phase->C) RegionNode( fall_in_cnt+1 );
0 a61af66fc99e Initial load duke parents: diff changeset	1208 phase->set_loop(landing_pad,_parent);
a61af66fc99e Initial load duke parents: diff changeset	1209 // Gather all the fall-in control paths into the landing pad
a61af66fc99e Initial load duke parents: diff changeset	1210 uint icnt = fall_in_cnt;
a61af66fc99e Initial load duke parents: diff changeset	1211 uint oreq = _head->req();
a61af66fc99e Initial load duke parents: diff changeset	1212 for( i = oreq-1; i>0; i-- )
a61af66fc99e Initial load duke parents: diff changeset	1213 if( !phase->is_member( this, _head->in(i) ) )
a61af66fc99e Initial load duke parents: diff changeset	1214 landing_pad->set_req(icnt--,_head->in(i));
a61af66fc99e Initial load duke parents: diff changeset	1215
a61af66fc99e Initial load duke parents: diff changeset	1216 // Peel off PhiNode edges as well
a61af66fc99e Initial load duke parents: diff changeset	1217 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) {
a61af66fc99e Initial load duke parents: diff changeset	1218 Node *oj = _head->fast_out(j);
a61af66fc99e Initial load duke parents: diff changeset	1219 if( oj->is_Phi() ) {
a61af66fc99e Initial load duke parents: diff changeset	1220 PhiNode* old_phi = oj->as_Phi();
a61af66fc99e Initial load duke parents: diff changeset	1221 assert( old_phi->region() == _head, "" );
a61af66fc99e Initial load duke parents: diff changeset	1222 igvn.hash_delete(old_phi); // Yank from hash before hacking edges
a61af66fc99e Initial load duke parents: diff changeset	1223 Node *p = PhiNode::make_blank(landing_pad, old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1224 uint icnt = fall_in_cnt;
a61af66fc99e Initial load duke parents: diff changeset	1225 for( i = oreq-1; i>0; i-- ) {
a61af66fc99e Initial load duke parents: diff changeset	1226 if( !phase->is_member( this, _head->in(i) ) ) {
a61af66fc99e Initial load duke parents: diff changeset	1227 p->init_req(icnt--, old_phi->in(i));
a61af66fc99e Initial load duke parents: diff changeset	1228 // Go ahead and clean out old edges from old phi
a61af66fc99e Initial load duke parents: diff changeset	1229 old_phi->del_req(i);
a61af66fc99e Initial load duke parents: diff changeset	1230 }
a61af66fc99e Initial load duke parents: diff changeset	1231 }
a61af66fc99e Initial load duke parents: diff changeset	1232 // Search for CSE's here, because ZKM.jar does a lot of
a61af66fc99e Initial load duke parents: diff changeset	1233 // loop hackery and we need to be a little incremental
a61af66fc99e Initial load duke parents: diff changeset	1234 // with the CSE to avoid O(N^2) node blow-up.
a61af66fc99e Initial load duke parents: diff changeset	1235 Node *p2 = igvn.hash_find_insert(p); // Look for a CSE
a61af66fc99e Initial load duke parents: diff changeset	1236 if( p2 ) { // Found CSE
a61af66fc99e Initial load duke parents: diff changeset	1237 p->destruct(); // Recover useless new node
a61af66fc99e Initial load duke parents: diff changeset	1238 p = p2; // Use old node
a61af66fc99e Initial load duke parents: diff changeset	1239 } else {
a61af66fc99e Initial load duke parents: diff changeset	1240 igvn.register_new_node_with_optimizer(p, old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1241 }
a61af66fc99e Initial load duke parents: diff changeset	1242 // Make old Phi refer to new Phi.
a61af66fc99e Initial load duke parents: diff changeset	1243 old_phi->add_req(p);
a61af66fc99e Initial load duke parents: diff changeset	1244 // Check for the special case of making the old phi useless and
a61af66fc99e Initial load duke parents: diff changeset	1245 // disappear it. In JavaGrande I have a case where this useless
a61af66fc99e Initial load duke parents: diff changeset	1246 // Phi is the loop limit and prevents recognizing a CountedLoop
a61af66fc99e Initial load duke parents: diff changeset	1247 // which in turn prevents removing an empty loop.
a61af66fc99e Initial load duke parents: diff changeset	1248 Node *id_old_phi = old_phi->Identity( &igvn );
a61af66fc99e Initial load duke parents: diff changeset	1249 if( id_old_phi != old_phi ) { // Found a simple identity?
1621 6027dddc26c6 6677629: PhaseIterGVN::subsume_node() should call hash_delete() and add_users_to_worklist() kvn parents: 1552 diff changeset	1250 // Note that I cannot call 'replace_node' here, because
0 a61af66fc99e Initial load duke parents: diff changeset	1251 // that will yank the edge from old_phi to the Region and
a61af66fc99e Initial load duke parents: diff changeset	1252 // I'm mid-iteration over the Region's uses.
a61af66fc99e Initial load duke parents: diff changeset	1253 for (DUIterator_Last imin, i = old_phi->last_outs(imin); i >= imin; ) {
a61af66fc99e Initial load duke parents: diff changeset	1254 Node* use = old_phi->last_out(i);
6144 5e990493719e 7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node, int, Node) where applicable kvn parents: 4862 diff changeset	1255 igvn.rehash_node_delayed(use);
0 a61af66fc99e Initial load duke parents: diff changeset	1256 uint uses_found = 0;
a61af66fc99e Initial load duke parents: diff changeset	1257 for (uint j = 0; j < use->len(); j++) {
a61af66fc99e Initial load duke parents: diff changeset	1258 if (use->in(j) == old_phi) {
a61af66fc99e Initial load duke parents: diff changeset	1259 if (j < use->req()) use->set_req (j, id_old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1260 else use->set_prec(j, id_old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1261 uses_found++;
a61af66fc99e Initial load duke parents: diff changeset	1262 }
a61af66fc99e Initial load duke parents: diff changeset	1263 }
a61af66fc99e Initial load duke parents: diff changeset	1264 i -= uses_found; // we deleted 1 or more copies of this edge
a61af66fc99e Initial load duke parents: diff changeset	1265 }
a61af66fc99e Initial load duke parents: diff changeset	1266 }
a61af66fc99e Initial load duke parents: diff changeset	1267 igvn._worklist.push(old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1268 }
a61af66fc99e Initial load duke parents: diff changeset	1269 }
a61af66fc99e Initial load duke parents: diff changeset	1270 // Finally clean out the fall-in edges from the RegionNode
a61af66fc99e Initial load duke parents: diff changeset	1271 for( i = oreq-1; i>0; i-- ) {
a61af66fc99e Initial load duke parents: diff changeset	1272 if( !phase->is_member( this, _head->in(i) ) ) {
a61af66fc99e Initial load duke parents: diff changeset	1273 _head->del_req(i);
a61af66fc99e Initial load duke parents: diff changeset	1274 }
a61af66fc99e Initial load duke parents: diff changeset	1275 }
a61af66fc99e Initial load duke parents: diff changeset	1276 // Transform landing pad
a61af66fc99e Initial load duke parents: diff changeset	1277 igvn.register_new_node_with_optimizer(landing_pad, _head);
a61af66fc99e Initial load duke parents: diff changeset	1278 // Insert landing pad into the header
a61af66fc99e Initial load duke parents: diff changeset	1279 _head->add_req(landing_pad);
a61af66fc99e Initial load duke parents: diff changeset	1280 }
a61af66fc99e Initial load duke parents: diff changeset	1281
a61af66fc99e Initial load duke parents: diff changeset	1282 //------------------------------split_outer_loop-------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1283 // Split out the outermost loop from this shared header.
a61af66fc99e Initial load duke parents: diff changeset	1284 void IdealLoopTree::split_outer_loop( PhaseIdealLoop *phase ) {
a61af66fc99e Initial load duke parents: diff changeset	1285 PhaseIterGVN &igvn = phase->_igvn;
a61af66fc99e Initial load duke parents: diff changeset	1286
a61af66fc99e Initial load duke parents: diff changeset	1287 // Find index of outermost loop; it should also be my tail.
a61af66fc99e Initial load duke parents: diff changeset	1288 uint outer_idx = 1;
a61af66fc99e Initial load duke parents: diff changeset	1289 while( _head->in(outer_idx) != _tail ) outer_idx++;
a61af66fc99e Initial load duke parents: diff changeset	1290
a61af66fc99e Initial load duke parents: diff changeset	1291 // Make a LoopNode for the outermost loop.
a61af66fc99e Initial load duke parents: diff changeset	1292 Node *ctl = _head->in(LoopNode::EntryControl);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1293 Node *outer = new (phase->C) LoopNode( ctl, _head->in(outer_idx) );
0 a61af66fc99e Initial load duke parents: diff changeset	1294 outer = igvn.register_new_node_with_optimizer(outer, _head);
a61af66fc99e Initial load duke parents: diff changeset	1295 phase->set_created_loop_node();
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	1296
0 a61af66fc99e Initial load duke parents: diff changeset	1297 // Outermost loop falls into '_head' loop
3845 c96c3eb1efae 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post kvn parents: 3782 diff changeset	1298 _head->set_req(LoopNode::EntryControl, outer);
0 a61af66fc99e Initial load duke parents: diff changeset	1299 _head->del_req(outer_idx);
a61af66fc99e Initial load duke parents: diff changeset	1300 // Split all the Phis up between '_head' loop and 'outer' loop.
a61af66fc99e Initial load duke parents: diff changeset	1301 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) {
a61af66fc99e Initial load duke parents: diff changeset	1302 Node *out = _head->fast_out(j);
a61af66fc99e Initial load duke parents: diff changeset	1303 if( out->is_Phi() ) {
a61af66fc99e Initial load duke parents: diff changeset	1304 PhiNode *old_phi = out->as_Phi();
a61af66fc99e Initial load duke parents: diff changeset	1305 assert( old_phi->region() == _head, "" );
a61af66fc99e Initial load duke parents: diff changeset	1306 Node *phi = PhiNode::make_blank(outer, old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1307 phi->init_req(LoopNode::EntryControl, old_phi->in(LoopNode::EntryControl));
a61af66fc99e Initial load duke parents: diff changeset	1308 phi->init_req(LoopNode::LoopBackControl, old_phi->in(outer_idx));
a61af66fc99e Initial load duke parents: diff changeset	1309 phi = igvn.register_new_node_with_optimizer(phi, old_phi);
a61af66fc99e Initial load duke parents: diff changeset	1310 // Make old Phi point to new Phi on the fall-in path
6144 5e990493719e 7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node, int, Node) where applicable kvn parents: 4862 diff changeset	1311 igvn.replace_input_of(old_phi, LoopNode::EntryControl, phi);
0 a61af66fc99e Initial load duke parents: diff changeset	1312 old_phi->del_req(outer_idx);
a61af66fc99e Initial load duke parents: diff changeset	1313 }
a61af66fc99e Initial load duke parents: diff changeset	1314 }
a61af66fc99e Initial load duke parents: diff changeset	1315
a61af66fc99e Initial load duke parents: diff changeset	1316 // Use the new loop head instead of the old shared one
a61af66fc99e Initial load duke parents: diff changeset	1317 _head = outer;
a61af66fc99e Initial load duke parents: diff changeset	1318 phase->set_loop(_head, this);
a61af66fc99e Initial load duke parents: diff changeset	1319 }
a61af66fc99e Initial load duke parents: diff changeset	1320
a61af66fc99e Initial load duke parents: diff changeset	1321 //------------------------------fix_parent-------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1322 static void fix_parent( IdealLoopTree loop, IdealLoopTree parent ) {
a61af66fc99e Initial load duke parents: diff changeset	1323 loop->_parent = parent;
a61af66fc99e Initial load duke parents: diff changeset	1324 if( loop->_child ) fix_parent( loop->_child, loop );
a61af66fc99e Initial load duke parents: diff changeset	1325 if( loop->_next ) fix_parent( loop->_next , parent );
a61af66fc99e Initial load duke parents: diff changeset	1326 }
a61af66fc99e Initial load duke parents: diff changeset	1327
a61af66fc99e Initial load duke parents: diff changeset	1328 //------------------------------estimate_path_freq-----------------------------
a61af66fc99e Initial load duke parents: diff changeset	1329 static float estimate_path_freq( Node *n ) {
a61af66fc99e Initial load duke parents: diff changeset	1330 // Try to extract some path frequency info
a61af66fc99e Initial load duke parents: diff changeset	1331 IfNode *iff;
a61af66fc99e Initial load duke parents: diff changeset	1332 for( int i = 0; i < 50; i++ ) { // Skip through a bunch of uncommon tests
a61af66fc99e Initial load duke parents: diff changeset	1333 uint nop = n->Opcode();
a61af66fc99e Initial load duke parents: diff changeset	1334 if( nop == Op_SafePoint ) { // Skip any safepoint
a61af66fc99e Initial load duke parents: diff changeset	1335 n = n->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1336 continue;
a61af66fc99e Initial load duke parents: diff changeset	1337 }
a61af66fc99e Initial load duke parents: diff changeset	1338 if( nop == Op_CatchProj ) { // Get count from a prior call
a61af66fc99e Initial load duke parents: diff changeset	1339 // Assume call does not always throw exceptions: means the call-site
a61af66fc99e Initial load duke parents: diff changeset	1340 // count is also the frequency of the fall-through path.
a61af66fc99e Initial load duke parents: diff changeset	1341 assert( n->is_CatchProj(), "" );
a61af66fc99e Initial load duke parents: diff changeset	1342 if( ((CatchProjNode*)n)->_con != CatchProjNode::fall_through_index )
a61af66fc99e Initial load duke parents: diff changeset	1343 return 0.0f; // Assume call exception path is rare
a61af66fc99e Initial load duke parents: diff changeset	1344 Node *call = n->in(0)->in(0)->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1345 assert( call->is_Call(), "expect a call here" );
a61af66fc99e Initial load duke parents: diff changeset	1346 const JVMState jvms = ((CallNode)call)->jvms();
a61af66fc99e Initial load duke parents: diff changeset	1347 ciMethodData* methodData = jvms->method()->method_data();
a61af66fc99e Initial load duke parents: diff changeset	1348 if (!methodData->is_mature()) return 0.0f; // No call-site data
a61af66fc99e Initial load duke parents: diff changeset	1349 ciProfileData* data = methodData->bci_to_data(jvms->bci());
a61af66fc99e Initial load duke parents: diff changeset	1350 if ((data == NULL) \|\| !data->is_CounterData()) {
a61af66fc99e Initial load duke parents: diff changeset	1351 // no call profile available, try call's control input
a61af66fc99e Initial load duke parents: diff changeset	1352 n = n->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1353 continue;
a61af66fc99e Initial load duke parents: diff changeset	1354 }
a61af66fc99e Initial load duke parents: diff changeset	1355 return data->as_CounterData()->count()/FreqCountInvocations;
a61af66fc99e Initial load duke parents: diff changeset	1356 }
a61af66fc99e Initial load duke parents: diff changeset	1357 // See if there's a gating IF test
a61af66fc99e Initial load duke parents: diff changeset	1358 Node *n_c = n->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1359 if( !n_c->is_If() ) break; // No estimate available
a61af66fc99e Initial load duke parents: diff changeset	1360 iff = n_c->as_If();
a61af66fc99e Initial load duke parents: diff changeset	1361 if( iff->_fcnt != COUNT_UNKNOWN ) // Have a valid count?
a61af66fc99e Initial load duke parents: diff changeset	1362 // Compute how much count comes on this path
a61af66fc99e Initial load duke parents: diff changeset	1363 return ((nop == Op_IfTrue) ? iff->_prob : 1.0f - iff->_prob) * iff->_fcnt;
a61af66fc99e Initial load duke parents: diff changeset	1364 // Have no count info. Skip dull uncommon-trap like branches.
a61af66fc99e Initial load duke parents: diff changeset	1365 if( (nop == Op_IfTrue && iff->_prob < PROB_LIKELY_MAG(5)) \|\|
a61af66fc99e Initial load duke parents: diff changeset	1366 (nop == Op_IfFalse && iff->_prob > PROB_UNLIKELY_MAG(5)) )
a61af66fc99e Initial load duke parents: diff changeset	1367 break;
a61af66fc99e Initial load duke parents: diff changeset	1368 // Skip through never-taken branch; look for a real loop exit.
a61af66fc99e Initial load duke parents: diff changeset	1369 n = iff->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1370 }
a61af66fc99e Initial load duke parents: diff changeset	1371 return 0.0f; // No estimate available
a61af66fc99e Initial load duke parents: diff changeset	1372 }
a61af66fc99e Initial load duke parents: diff changeset	1373
a61af66fc99e Initial load duke parents: diff changeset	1374 //------------------------------merge_many_backedges---------------------------
a61af66fc99e Initial load duke parents: diff changeset	1375 // Merge all the backedges from the shared header into a private Region.
a61af66fc99e Initial load duke parents: diff changeset	1376 // Feed that region as the one backedge to this loop.
a61af66fc99e Initial load duke parents: diff changeset	1377 void IdealLoopTree::merge_many_backedges( PhaseIdealLoop *phase ) {
a61af66fc99e Initial load duke parents: diff changeset	1378 uint i;
a61af66fc99e Initial load duke parents: diff changeset	1379
a61af66fc99e Initial load duke parents: diff changeset	1380 // Scan for the top 2 hottest backedges
a61af66fc99e Initial load duke parents: diff changeset	1381 float hotcnt = 0.0f;
a61af66fc99e Initial load duke parents: diff changeset	1382 float warmcnt = 0.0f;
a61af66fc99e Initial load duke parents: diff changeset	1383 uint hot_idx = 0;
a61af66fc99e Initial load duke parents: diff changeset	1384 // Loop starts at 2 because slot 1 is the fall-in path
a61af66fc99e Initial load duke parents: diff changeset	1385 for( i = 2; i < _head->req(); i++ ) {
a61af66fc99e Initial load duke parents: diff changeset	1386 float cnt = estimate_path_freq(_head->in(i));
a61af66fc99e Initial load duke parents: diff changeset	1387 if( cnt > hotcnt ) { // Grab hottest path
a61af66fc99e Initial load duke parents: diff changeset	1388 warmcnt = hotcnt;
a61af66fc99e Initial load duke parents: diff changeset	1389 hotcnt = cnt;
a61af66fc99e Initial load duke parents: diff changeset	1390 hot_idx = i;
a61af66fc99e Initial load duke parents: diff changeset	1391 } else if( cnt > warmcnt ) { // And 2nd hottest path
a61af66fc99e Initial load duke parents: diff changeset	1392 warmcnt = cnt;
a61af66fc99e Initial load duke parents: diff changeset	1393 }
a61af66fc99e Initial load duke parents: diff changeset	1394 }
a61af66fc99e Initial load duke parents: diff changeset	1395
a61af66fc99e Initial load duke parents: diff changeset	1396 // See if the hottest backedge is worthy of being an inner loop
a61af66fc99e Initial load duke parents: diff changeset	1397 // by being much hotter than the next hottest backedge.
a61af66fc99e Initial load duke parents: diff changeset	1398 if( hotcnt <= 0.0001 \|\|
a61af66fc99e Initial load duke parents: diff changeset	1399 hotcnt < 2.0*warmcnt ) hot_idx = 0;// No hot backedge
a61af66fc99e Initial load duke parents: diff changeset	1400
a61af66fc99e Initial load duke parents: diff changeset	1401 // Peel out the backedges into a private merge point; peel
a61af66fc99e Initial load duke parents: diff changeset	1402 // them all except optionally hot_idx.
a61af66fc99e Initial load duke parents: diff changeset	1403 PhaseIterGVN &igvn = phase->_igvn;
a61af66fc99e Initial load duke parents: diff changeset	1404
a61af66fc99e Initial load duke parents: diff changeset	1405 Node *hot_tail = NULL;
a61af66fc99e Initial load duke parents: diff changeset	1406 // Make a Region for the merge point
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1407 Node *r = new (phase->C) RegionNode(1);
0 a61af66fc99e Initial load duke parents: diff changeset	1408 for( i = 2; i < _head->req(); i++ ) {
a61af66fc99e Initial load duke parents: diff changeset	1409 if( i != hot_idx )
a61af66fc99e Initial load duke parents: diff changeset	1410 r->add_req( _head->in(i) );
a61af66fc99e Initial load duke parents: diff changeset	1411 else hot_tail = _head->in(i);
a61af66fc99e Initial load duke parents: diff changeset	1412 }
a61af66fc99e Initial load duke parents: diff changeset	1413 igvn.register_new_node_with_optimizer(r, _head);
a61af66fc99e Initial load duke parents: diff changeset	1414 // Plug region into end of loop _head, followed by hot_tail
a61af66fc99e Initial load duke parents: diff changeset	1415 while( _head->req() > 3 ) _head->del_req( _head->req()-1 );
a61af66fc99e Initial load duke parents: diff changeset	1416 _head->set_req(2, r);
a61af66fc99e Initial load duke parents: diff changeset	1417 if( hot_idx ) _head->add_req(hot_tail);
a61af66fc99e Initial load duke parents: diff changeset	1418
a61af66fc99e Initial load duke parents: diff changeset	1419 // Split all the Phis up between '_head' loop and the Region 'r'
a61af66fc99e Initial load duke parents: diff changeset	1420 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) {
a61af66fc99e Initial load duke parents: diff changeset	1421 Node *out = _head->fast_out(j);
a61af66fc99e Initial load duke parents: diff changeset	1422 if( out->is_Phi() ) {
a61af66fc99e Initial load duke parents: diff changeset	1423 PhiNode* n = out->as_Phi();
a61af66fc99e Initial load duke parents: diff changeset	1424 igvn.hash_delete(n); // Delete from hash before hacking edges
a61af66fc99e Initial load duke parents: diff changeset	1425 Node *hot_phi = NULL;
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1426 Node *phi = new (phase->C) PhiNode(r, n->type(), n->adr_type());
0 a61af66fc99e Initial load duke parents: diff changeset	1427 // Check all inputs for the ones to peel out
a61af66fc99e Initial load duke parents: diff changeset	1428 uint j = 1;
a61af66fc99e Initial load duke parents: diff changeset	1429 for( uint i = 2; i < n->req(); i++ ) {
a61af66fc99e Initial load duke parents: diff changeset	1430 if( i != hot_idx )
a61af66fc99e Initial load duke parents: diff changeset	1431 phi->set_req( j++, n->in(i) );
a61af66fc99e Initial load duke parents: diff changeset	1432 else hot_phi = n->in(i);
a61af66fc99e Initial load duke parents: diff changeset	1433 }
a61af66fc99e Initial load duke parents: diff changeset	1434 // Register the phi but do not transform until whole place transforms
a61af66fc99e Initial load duke parents: diff changeset	1435 igvn.register_new_node_with_optimizer(phi, n);
a61af66fc99e Initial load duke parents: diff changeset	1436 // Add the merge phi to the old Phi
a61af66fc99e Initial load duke parents: diff changeset	1437 while( n->req() > 3 ) n->del_req( n->req()-1 );
a61af66fc99e Initial load duke parents: diff changeset	1438 n->set_req(2, phi);
a61af66fc99e Initial load duke parents: diff changeset	1439 if( hot_idx ) n->add_req(hot_phi);
a61af66fc99e Initial load duke parents: diff changeset	1440 }
a61af66fc99e Initial load duke parents: diff changeset	1441 }
a61af66fc99e Initial load duke parents: diff changeset	1442
a61af66fc99e Initial load duke parents: diff changeset	1443
a61af66fc99e Initial load duke parents: diff changeset	1444 // Insert a new IdealLoopTree inserted below me. Turn it into a clone
a61af66fc99e Initial load duke parents: diff changeset	1445 // of self loop tree. Turn self into a loop headed by _head and with
a61af66fc99e Initial load duke parents: diff changeset	1446 // tail being the new merge point.
a61af66fc99e Initial load duke parents: diff changeset	1447 IdealLoopTree *ilt = new IdealLoopTree( phase, _head, _tail );
a61af66fc99e Initial load duke parents: diff changeset	1448 phase->set_loop(_tail,ilt); // Adjust tail
a61af66fc99e Initial load duke parents: diff changeset	1449 _tail = r; // Self's tail is new merge point
a61af66fc99e Initial load duke parents: diff changeset	1450 phase->set_loop(r,this);
a61af66fc99e Initial load duke parents: diff changeset	1451 ilt->_child = _child; // New guy has my children
a61af66fc99e Initial load duke parents: diff changeset	1452 _child = ilt; // Self has new guy as only child
a61af66fc99e Initial load duke parents: diff changeset	1453 ilt->_parent = this; // new guy has self for parent
a61af66fc99e Initial load duke parents: diff changeset	1454 ilt->_nest = _nest; // Same nesting depth (for now)
a61af66fc99e Initial load duke parents: diff changeset	1455
a61af66fc99e Initial load duke parents: diff changeset	1456 // Starting with 'ilt', look for child loop trees using the same shared
a61af66fc99e Initial load duke parents: diff changeset	1457 // header. Flatten these out; they will no longer be loops in the end.
a61af66fc99e Initial load duke parents: diff changeset	1458 IdealLoopTree **pilt = &_child;
a61af66fc99e Initial load duke parents: diff changeset	1459 while( ilt ) {
a61af66fc99e Initial load duke parents: diff changeset	1460 if( ilt->_head == _head ) {
a61af66fc99e Initial load duke parents: diff changeset	1461 uint i;
a61af66fc99e Initial load duke parents: diff changeset	1462 for( i = 2; i < _head->req(); i++ )
a61af66fc99e Initial load duke parents: diff changeset	1463 if( _head->in(i) == ilt->_tail )
a61af66fc99e Initial load duke parents: diff changeset	1464 break; // Still a loop
a61af66fc99e Initial load duke parents: diff changeset	1465 if( i == _head->req() ) { // No longer a loop
a61af66fc99e Initial load duke parents: diff changeset	1466 // Flatten ilt. Hang ilt's "_next" list from the end of
a61af66fc99e Initial load duke parents: diff changeset	1467 // ilt's '_child' list. Move the ilt's _child up to replace ilt.
a61af66fc99e Initial load duke parents: diff changeset	1468 IdealLoopTree **cp = &ilt->_child;
a61af66fc99e Initial load duke parents: diff changeset	1469 while( cp ) cp = &(cp)->_next; // Find end of child list
a61af66fc99e Initial load duke parents: diff changeset	1470 *cp = ilt->_next; // Hang next list at end of child list
a61af66fc99e Initial load duke parents: diff changeset	1471 *pilt = ilt->_child; // Move child up to replace ilt
a61af66fc99e Initial load duke parents: diff changeset	1472 ilt->_head = NULL; // Flag as a loop UNIONED into parent
a61af66fc99e Initial load duke parents: diff changeset	1473 ilt = ilt->_child; // Repeat using new ilt
a61af66fc99e Initial load duke parents: diff changeset	1474 continue; // do not advance over ilt->_child
a61af66fc99e Initial load duke parents: diff changeset	1475 }
a61af66fc99e Initial load duke parents: diff changeset	1476 assert( ilt->_tail == hot_tail, "expected to only find the hot inner loop here" );
a61af66fc99e Initial load duke parents: diff changeset	1477 phase->set_loop(_head,ilt);
a61af66fc99e Initial load duke parents: diff changeset	1478 }
a61af66fc99e Initial load duke parents: diff changeset	1479 pilt = &ilt->_child; // Advance to next
a61af66fc99e Initial load duke parents: diff changeset	1480 ilt = *pilt;
a61af66fc99e Initial load duke parents: diff changeset	1481 }
a61af66fc99e Initial load duke parents: diff changeset	1482
a61af66fc99e Initial load duke parents: diff changeset	1483 if( _child ) fix_parent( _child, this );
a61af66fc99e Initial load duke parents: diff changeset	1484 }
a61af66fc99e Initial load duke parents: diff changeset	1485
a61af66fc99e Initial load duke parents: diff changeset	1486 //------------------------------beautify_loops---------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1487 // Split shared headers and insert loop landing pads.
a61af66fc99e Initial load duke parents: diff changeset	1488 // Insert a LoopNode to replace the RegionNode.
a61af66fc99e Initial load duke parents: diff changeset	1489 // Return TRUE if loop tree is structurally changed.
a61af66fc99e Initial load duke parents: diff changeset	1490 bool IdealLoopTree::beautify_loops( PhaseIdealLoop *phase ) {
a61af66fc99e Initial load duke parents: diff changeset	1491 bool result = false;
a61af66fc99e Initial load duke parents: diff changeset	1492 // Cache parts in locals for easy
a61af66fc99e Initial load duke parents: diff changeset	1493 PhaseIterGVN &igvn = phase->_igvn;
a61af66fc99e Initial load duke parents: diff changeset	1494
a61af66fc99e Initial load duke parents: diff changeset	1495 igvn.hash_delete(_head); // Yank from hash before hacking edges
a61af66fc99e Initial load duke parents: diff changeset	1496
a61af66fc99e Initial load duke parents: diff changeset	1497 // Check for multiple fall-in paths. Peel off a landing pad if need be.
a61af66fc99e Initial load duke parents: diff changeset	1498 int fall_in_cnt = 0;
a61af66fc99e Initial load duke parents: diff changeset	1499 for( uint i = 1; i < _head->req(); i++ )
a61af66fc99e Initial load duke parents: diff changeset	1500 if( !phase->is_member( this, _head->in(i) ) )
a61af66fc99e Initial load duke parents: diff changeset	1501 fall_in_cnt++;
a61af66fc99e Initial load duke parents: diff changeset	1502 assert( fall_in_cnt, "at least 1 fall-in path" );
a61af66fc99e Initial load duke parents: diff changeset	1503 if( fall_in_cnt > 1 ) // Need a loop landing pad to merge fall-ins
a61af66fc99e Initial load duke parents: diff changeset	1504 split_fall_in( phase, fall_in_cnt );
a61af66fc99e Initial load duke parents: diff changeset	1505
a61af66fc99e Initial load duke parents: diff changeset	1506 // Swap inputs to the _head and all Phis to move the fall-in edge to
a61af66fc99e Initial load duke parents: diff changeset	1507 // the left.
a61af66fc99e Initial load duke parents: diff changeset	1508 fall_in_cnt = 1;
a61af66fc99e Initial load duke parents: diff changeset	1509 while( phase->is_member( this, _head->in(fall_in_cnt) ) )
a61af66fc99e Initial load duke parents: diff changeset	1510 fall_in_cnt++;
a61af66fc99e Initial load duke parents: diff changeset	1511 if( fall_in_cnt > 1 ) {
a61af66fc99e Initial load duke parents: diff changeset	1512 // Since I am just swapping inputs I do not need to update def-use info
a61af66fc99e Initial load duke parents: diff changeset	1513 Node *tmp = _head->in(1);
a61af66fc99e Initial load duke parents: diff changeset	1514 _head->set_req( 1, _head->in(fall_in_cnt) );
a61af66fc99e Initial load duke parents: diff changeset	1515 _head->set_req( fall_in_cnt, tmp );
a61af66fc99e Initial load duke parents: diff changeset	1516 // Swap also all Phis
a61af66fc99e Initial load duke parents: diff changeset	1517 for (DUIterator_Fast imax, i = _head->fast_outs(imax); i < imax; i++) {
a61af66fc99e Initial load duke parents: diff changeset	1518 Node* phi = _head->fast_out(i);
a61af66fc99e Initial load duke parents: diff changeset	1519 if( phi->is_Phi() ) {
a61af66fc99e Initial load duke parents: diff changeset	1520 igvn.hash_delete(phi); // Yank from hash before hacking edges
a61af66fc99e Initial load duke parents: diff changeset	1521 tmp = phi->in(1);
a61af66fc99e Initial load duke parents: diff changeset	1522 phi->set_req( 1, phi->in(fall_in_cnt) );
a61af66fc99e Initial load duke parents: diff changeset	1523 phi->set_req( fall_in_cnt, tmp );
a61af66fc99e Initial load duke parents: diff changeset	1524 }
a61af66fc99e Initial load duke parents: diff changeset	1525 }
a61af66fc99e Initial load duke parents: diff changeset	1526 }
a61af66fc99e Initial load duke parents: diff changeset	1527 assert( !phase->is_member( this, _head->in(1) ), "left edge is fall-in" );
a61af66fc99e Initial load duke parents: diff changeset	1528 assert( phase->is_member( this, _head->in(2) ), "right edge is loop" );
a61af66fc99e Initial load duke parents: diff changeset	1529
a61af66fc99e Initial load duke parents: diff changeset	1530 // If I am a shared header (multiple backedges), peel off the many
a61af66fc99e Initial load duke parents: diff changeset	1531 // backedges into a private merge point and use the merge point as
a61af66fc99e Initial load duke parents: diff changeset	1532 // the one true backedge.
a61af66fc99e Initial load duke parents: diff changeset	1533 if( _head->req() > 3 ) {
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	1534 // Merge the many backedges into a single backedge but leave
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	1535 // the hottest backedge as separate edge for the following peel.
0 a61af66fc99e Initial load duke parents: diff changeset	1536 merge_many_backedges( phase );
a61af66fc99e Initial load duke parents: diff changeset	1537 result = true;
a61af66fc99e Initial load duke parents: diff changeset	1538 }
a61af66fc99e Initial load duke parents: diff changeset	1539
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	1540 // If I have one hot backedge, peel off myself loop.
0 a61af66fc99e Initial load duke parents: diff changeset	1541 // I better be the outermost loop.
17914 3636afd5ec1a 8039298: assert(base == NULL \|\| t_adr->isa_rawptr() \|\| !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) kvn parents: 17887 diff changeset	1542 if (_head->req() > 3 && !_irreducible) {
0 a61af66fc99e Initial load duke parents: diff changeset	1543 split_outer_loop( phase );
a61af66fc99e Initial load duke parents: diff changeset	1544 result = true;
a61af66fc99e Initial load duke parents: diff changeset	1545
17914 3636afd5ec1a 8039298: assert(base == NULL \|\| t_adr->isa_rawptr() \|\| !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) kvn parents: 17887 diff changeset	1546 } else if (!_head->is_Loop() && !_irreducible) {
0 a61af66fc99e Initial load duke parents: diff changeset	1547 // Make a new LoopNode to replace the old loop head
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1548 Node *l = new (phase->C) LoopNode( _head->in(1), _head->in(2) );
0 a61af66fc99e Initial load duke parents: diff changeset	1549 l = igvn.register_new_node_with_optimizer(l, _head);
a61af66fc99e Initial load duke parents: diff changeset	1550 phase->set_created_loop_node();
a61af66fc99e Initial load duke parents: diff changeset	1551 // Go ahead and replace _head
1621 6027dddc26c6 6677629: PhaseIterGVN::subsume_node() should call hash_delete() and add_users_to_worklist() kvn parents: 1552 diff changeset	1552 phase->_igvn.replace_node( _head, l );
0 a61af66fc99e Initial load duke parents: diff changeset	1553 _head = l;
a61af66fc99e Initial load duke parents: diff changeset	1554 phase->set_loop(_head, this);
a61af66fc99e Initial load duke parents: diff changeset	1555 }
a61af66fc99e Initial load duke parents: diff changeset	1556
a61af66fc99e Initial load duke parents: diff changeset	1557 // Now recursively beautify nested loops
a61af66fc99e Initial load duke parents: diff changeset	1558 if( _child ) result \|= _child->beautify_loops( phase );
a61af66fc99e Initial load duke parents: diff changeset	1559 if( _next ) result \|= _next ->beautify_loops( phase );
a61af66fc99e Initial load duke parents: diff changeset	1560 return result;
a61af66fc99e Initial load duke parents: diff changeset	1561 }
a61af66fc99e Initial load duke parents: diff changeset	1562
a61af66fc99e Initial load duke parents: diff changeset	1563 //------------------------------allpaths_check_safepts----------------------------
a61af66fc99e Initial load duke parents: diff changeset	1564 // Allpaths backwards scan from loop tail, terminating each path at first safepoint
a61af66fc99e Initial load duke parents: diff changeset	1565 // encountered. Helper for check_safepts.
a61af66fc99e Initial load duke parents: diff changeset	1566 void IdealLoopTree::allpaths_check_safepts(VectorSet &visited, Node_List &stack) {
a61af66fc99e Initial load duke parents: diff changeset	1567 assert(stack.size() == 0, "empty stack");
a61af66fc99e Initial load duke parents: diff changeset	1568 stack.push(_tail);
a61af66fc99e Initial load duke parents: diff changeset	1569 visited.Clear();
a61af66fc99e Initial load duke parents: diff changeset	1570 visited.set(_tail->_idx);
a61af66fc99e Initial load duke parents: diff changeset	1571 while (stack.size() > 0) {
a61af66fc99e Initial load duke parents: diff changeset	1572 Node* n = stack.pop();
a61af66fc99e Initial load duke parents: diff changeset	1573 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) {
a61af66fc99e Initial load duke parents: diff changeset	1574 // Terminate this path
a61af66fc99e Initial load duke parents: diff changeset	1575 } else if (n->Opcode() == Op_SafePoint) {
a61af66fc99e Initial load duke parents: diff changeset	1576 if (_phase->get_loop(n) != this) {
a61af66fc99e Initial load duke parents: diff changeset	1577 if (_required_safept == NULL) _required_safept = new Node_List();
a61af66fc99e Initial load duke parents: diff changeset	1578 _required_safept->push(n); // save the one closest to the tail
a61af66fc99e Initial load duke parents: diff changeset	1579 }
a61af66fc99e Initial load duke parents: diff changeset	1580 // Terminate this path
a61af66fc99e Initial load duke parents: diff changeset	1581 } else {
a61af66fc99e Initial load duke parents: diff changeset	1582 uint start = n->is_Region() ? 1 : 0;
a61af66fc99e Initial load duke parents: diff changeset	1583 uint end = n->is_Region() && !n->is_Loop() ? n->req() : start + 1;
a61af66fc99e Initial load duke parents: diff changeset	1584 for (uint i = start; i < end; i++) {
a61af66fc99e Initial load duke parents: diff changeset	1585 Node* in = n->in(i);
a61af66fc99e Initial load duke parents: diff changeset	1586 assert(in->is_CFG(), "must be");
a61af66fc99e Initial load duke parents: diff changeset	1587 if (!visited.test_set(in->_idx) && is_member(_phase->get_loop(in))) {
a61af66fc99e Initial load duke parents: diff changeset	1588 stack.push(in);
a61af66fc99e Initial load duke parents: diff changeset	1589 }
a61af66fc99e Initial load duke parents: diff changeset	1590 }
a61af66fc99e Initial load duke parents: diff changeset	1591 }
a61af66fc99e Initial load duke parents: diff changeset	1592 }
a61af66fc99e Initial load duke parents: diff changeset	1593 }
a61af66fc99e Initial load duke parents: diff changeset	1594
a61af66fc99e Initial load duke parents: diff changeset	1595 //------------------------------check_safepts----------------------------
a61af66fc99e Initial load duke parents: diff changeset	1596 // Given dominators, try to find loops with calls that must always be
a61af66fc99e Initial load duke parents: diff changeset	1597 // executed (call dominates loop tail). These loops do not need non-call
a61af66fc99e Initial load duke parents: diff changeset	1598 // safepoints (ncsfpt).
a61af66fc99e Initial load duke parents: diff changeset	1599 //
a61af66fc99e Initial load duke parents: diff changeset	1600 // A complication is that a safepoint in a inner loop may be needed
a61af66fc99e Initial load duke parents: diff changeset	1601 // by an outer loop. In the following, the inner loop sees it has a
a61af66fc99e Initial load duke parents: diff changeset	1602 // call (block 3) on every path from the head (block 2) to the
a61af66fc99e Initial load duke parents: diff changeset	1603 // backedge (arc 3->2). So it deletes the ncsfpt (non-call safepoint)
a61af66fc99e Initial load duke parents: diff changeset	1604 // in block 2, _but_ this leaves the outer loop without a safepoint.
a61af66fc99e Initial load duke parents: diff changeset	1605 //
a61af66fc99e Initial load duke parents: diff changeset	1606 // entry 0
a61af66fc99e Initial load duke parents: diff changeset	1607 // \|
a61af66fc99e Initial load duke parents: diff changeset	1608 // v
a61af66fc99e Initial load duke parents: diff changeset	1609 // outer 1,2 +->1
a61af66fc99e Initial load duke parents: diff changeset	1610 // \| \|
a61af66fc99e Initial load duke parents: diff changeset	1611 // \| v
a61af66fc99e Initial load duke parents: diff changeset	1612 // \| 2<---+ ncsfpt in 2
a61af66fc99e Initial load duke parents: diff changeset	1613 // \|_/\|\ \|
a61af66fc99e Initial load duke parents: diff changeset	1614 // \| v \|
a61af66fc99e Initial load duke parents: diff changeset	1615 // inner 2,3 / 3 \| call in 3
a61af66fc99e Initial load duke parents: diff changeset	1616 // / \| \|
a61af66fc99e Initial load duke parents: diff changeset	1617 // v +--+
a61af66fc99e Initial load duke parents: diff changeset	1618 // exit 4
a61af66fc99e Initial load duke parents: diff changeset	1619 //
a61af66fc99e Initial load duke parents: diff changeset	1620 //
a61af66fc99e Initial load duke parents: diff changeset	1621 // This method creates a list (_required_safept) of ncsfpt nodes that must
a61af66fc99e Initial load duke parents: diff changeset	1622 // be protected is created for each loop. When a ncsfpt maybe deleted, it
a61af66fc99e Initial load duke parents: diff changeset	1623 // is first looked for in the lists for the outer loops of the current loop.
a61af66fc99e Initial load duke parents: diff changeset	1624 //
a61af66fc99e Initial load duke parents: diff changeset	1625 // The insights into the problem:
a61af66fc99e Initial load duke parents: diff changeset	1626 // A) counted loops are okay
a61af66fc99e Initial load duke parents: diff changeset	1627 // B) innermost loops are okay (only an inner loop can delete
a61af66fc99e Initial load duke parents: diff changeset	1628 // a ncsfpt needed by an outer loop)
a61af66fc99e Initial load duke parents: diff changeset	1629 // C) a loop is immune from an inner loop deleting a safepoint
a61af66fc99e Initial load duke parents: diff changeset	1630 // if the loop has a call on the idom-path
a61af66fc99e Initial load duke parents: diff changeset	1631 // D) a loop is also immune if it has a ncsfpt (non-call safepoint) on the
a61af66fc99e Initial load duke parents: diff changeset	1632 // idom-path that is not in a nested loop
a61af66fc99e Initial load duke parents: diff changeset	1633 // E) otherwise, an ncsfpt on the idom-path that is nested in an inner
a61af66fc99e Initial load duke parents: diff changeset	1634 // loop needs to be prevented from deletion by an inner loop
a61af66fc99e Initial load duke parents: diff changeset	1635 //
a61af66fc99e Initial load duke parents: diff changeset	1636 // There are two analyses:
a61af66fc99e Initial load duke parents: diff changeset	1637 // 1) The first, and cheaper one, scans the loop body from
a61af66fc99e Initial load duke parents: diff changeset	1638 // tail to head following the idom (immediate dominator)
a61af66fc99e Initial load duke parents: diff changeset	1639 // chain, looking for the cases (C,D,E) above.
a61af66fc99e Initial load duke parents: diff changeset	1640 // Since inner loops are scanned before outer loops, there is summary
a61af66fc99e Initial load duke parents: diff changeset	1641 // information about inner loops. Inner loops can be skipped over
a61af66fc99e Initial load duke parents: diff changeset	1642 // when the tail of an inner loop is encountered.
a61af66fc99e Initial load duke parents: diff changeset	1643 //
a61af66fc99e Initial load duke parents: diff changeset	1644 // 2) The second, invoked if the first fails to find a call or ncsfpt on
a61af66fc99e Initial load duke parents: diff changeset	1645 // the idom path (which is rare), scans all predecessor control paths
a61af66fc99e Initial load duke parents: diff changeset	1646 // from the tail to the head, terminating a path when a call or sfpt
a61af66fc99e Initial load duke parents: diff changeset	1647 // is encountered, to find the ncsfpt's that are closest to the tail.
a61af66fc99e Initial load duke parents: diff changeset	1648 //
a61af66fc99e Initial load duke parents: diff changeset	1649 void IdealLoopTree::check_safepts(VectorSet &visited, Node_List &stack) {
a61af66fc99e Initial load duke parents: diff changeset	1650 // Bottom up traversal
a61af66fc99e Initial load duke parents: diff changeset	1651 IdealLoopTree* ch = _child;
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	1652 if (_child) _child->check_safepts(visited, stack);
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	1653 if (_next) _next ->check_safepts(visited, stack);
0 a61af66fc99e Initial load duke parents: diff changeset	1654
a61af66fc99e Initial load duke parents: diff changeset	1655 if (!_head->is_CountedLoop() && !_has_sfpt && _parent != NULL && !_irreducible) {
a61af66fc99e Initial load duke parents: diff changeset	1656 bool has_call = false; // call on dom-path
a61af66fc99e Initial load duke parents: diff changeset	1657 bool has_local_ncsfpt = false; // ncsfpt on dom-path at this loop depth
a61af66fc99e Initial load duke parents: diff changeset	1658 Node* nonlocal_ncsfpt = NULL; // ncsfpt on dom-path at a deeper depth
a61af66fc99e Initial load duke parents: diff changeset	1659 // Scan the dom-path nodes from tail to head
a61af66fc99e Initial load duke parents: diff changeset	1660 for (Node* n = tail(); n != _head; n = _phase->idom(n)) {
a61af66fc99e Initial load duke parents: diff changeset	1661 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) {
a61af66fc99e Initial load duke parents: diff changeset	1662 has_call = true;
a61af66fc99e Initial load duke parents: diff changeset	1663 _has_sfpt = 1; // Then no need for a safept!
a61af66fc99e Initial load duke parents: diff changeset	1664 break;
a61af66fc99e Initial load duke parents: diff changeset	1665 } else if (n->Opcode() == Op_SafePoint) {
a61af66fc99e Initial load duke parents: diff changeset	1666 if (_phase->get_loop(n) == this) {
a61af66fc99e Initial load duke parents: diff changeset	1667 has_local_ncsfpt = true;
a61af66fc99e Initial load duke parents: diff changeset	1668 break;
a61af66fc99e Initial load duke parents: diff changeset	1669 }
a61af66fc99e Initial load duke parents: diff changeset	1670 if (nonlocal_ncsfpt == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1671 nonlocal_ncsfpt = n; // save the one closest to the tail
a61af66fc99e Initial load duke parents: diff changeset	1672 }
a61af66fc99e Initial load duke parents: diff changeset	1673 } else {
a61af66fc99e Initial load duke parents: diff changeset	1674 IdealLoopTree* nlpt = _phase->get_loop(n);
a61af66fc99e Initial load duke parents: diff changeset	1675 if (this != nlpt) {
a61af66fc99e Initial load duke parents: diff changeset	1676 // If at an inner loop tail, see if the inner loop has already
a61af66fc99e Initial load duke parents: diff changeset	1677 // recorded seeing a call on the dom-path (and stop.) If not,
a61af66fc99e Initial load duke parents: diff changeset	1678 // jump to the head of the inner loop.
a61af66fc99e Initial load duke parents: diff changeset	1679 assert(is_member(nlpt), "nested loop");
a61af66fc99e Initial load duke parents: diff changeset	1680 Node* tail = nlpt->_tail;
a61af66fc99e Initial load duke parents: diff changeset	1681 if (tail->in(0)->is_If()) tail = tail->in(0);
a61af66fc99e Initial load duke parents: diff changeset	1682 if (n == tail) {
a61af66fc99e Initial load duke parents: diff changeset	1683 // If inner loop has call on dom-path, so does outer loop
a61af66fc99e Initial load duke parents: diff changeset	1684 if (nlpt->_has_sfpt) {
a61af66fc99e Initial load duke parents: diff changeset	1685 has_call = true;
a61af66fc99e Initial load duke parents: diff changeset	1686 _has_sfpt = 1;
a61af66fc99e Initial load duke parents: diff changeset	1687 break;
a61af66fc99e Initial load duke parents: diff changeset	1688 }
a61af66fc99e Initial load duke parents: diff changeset	1689 // Skip to head of inner loop
a61af66fc99e Initial load duke parents: diff changeset	1690 assert(_phase->is_dominator(_head, nlpt->_head), "inner head dominated by outer head");
a61af66fc99e Initial load duke parents: diff changeset	1691 n = nlpt->_head;
a61af66fc99e Initial load duke parents: diff changeset	1692 }
a61af66fc99e Initial load duke parents: diff changeset	1693 }
a61af66fc99e Initial load duke parents: diff changeset	1694 }
a61af66fc99e Initial load duke parents: diff changeset	1695 }
a61af66fc99e Initial load duke parents: diff changeset	1696 // Record safept's that this loop needs preserved when an
a61af66fc99e Initial load duke parents: diff changeset	1697 // inner loop attempts to delete it's safepoints.
a61af66fc99e Initial load duke parents: diff changeset	1698 if (_child != NULL && !has_call && !has_local_ncsfpt) {
a61af66fc99e Initial load duke parents: diff changeset	1699 if (nonlocal_ncsfpt != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1700 if (_required_safept == NULL) _required_safept = new Node_List();
a61af66fc99e Initial load duke parents: diff changeset	1701 _required_safept->push(nonlocal_ncsfpt);
a61af66fc99e Initial load duke parents: diff changeset	1702 } else {
a61af66fc99e Initial load duke parents: diff changeset	1703 // Failed to find a suitable safept on the dom-path. Now use
a61af66fc99e Initial load duke parents: diff changeset	1704 // an all paths walk from tail to head, looking for safepoints to preserve.
a61af66fc99e Initial load duke parents: diff changeset	1705 allpaths_check_safepts(visited, stack);
a61af66fc99e Initial load duke parents: diff changeset	1706 }
a61af66fc99e Initial load duke parents: diff changeset	1707 }
a61af66fc99e Initial load duke parents: diff changeset	1708 }
a61af66fc99e Initial load duke parents: diff changeset	1709 }
a61af66fc99e Initial load duke parents: diff changeset	1710
a61af66fc99e Initial load duke parents: diff changeset	1711 //---------------------------is_deleteable_safept----------------------------
a61af66fc99e Initial load duke parents: diff changeset	1712 // Is safept not required by an outer loop?
a61af66fc99e Initial load duke parents: diff changeset	1713 bool PhaseIdealLoop::is_deleteable_safept(Node* sfpt) {
a61af66fc99e Initial load duke parents: diff changeset	1714 assert(sfpt->Opcode() == Op_SafePoint, "");
a61af66fc99e Initial load duke parents: diff changeset	1715 IdealLoopTree* lp = get_loop(sfpt)->_parent;
a61af66fc99e Initial load duke parents: diff changeset	1716 while (lp != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1717 Node_List* sfpts = lp->_required_safept;
a61af66fc99e Initial load duke parents: diff changeset	1718 if (sfpts != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	1719 for (uint i = 0; i < sfpts->size(); i++) {
a61af66fc99e Initial load duke parents: diff changeset	1720 if (sfpt == sfpts->at(i))
a61af66fc99e Initial load duke parents: diff changeset	1721 return false;
a61af66fc99e Initial load duke parents: diff changeset	1722 }
a61af66fc99e Initial load duke parents: diff changeset	1723 }
a61af66fc99e Initial load duke parents: diff changeset	1724 lp = lp->_parent;
a61af66fc99e Initial load duke parents: diff changeset	1725 }
a61af66fc99e Initial load duke parents: diff changeset	1726 return true;
a61af66fc99e Initial load duke parents: diff changeset	1727 }
a61af66fc99e Initial load duke parents: diff changeset	1728
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1729 //---------------------------replace_parallel_iv-------------------------------
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1730 // Replace parallel induction variable (parallel to trip counter)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1731 void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1732 assert(loop->_head->is_CountedLoop(), "");
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1733 CountedLoopNode *cl = loop->_head->as_CountedLoop();
3850 6987871cfb9b 7077439: Possible reference through NULL in loopPredicate.cpp:726 kvn parents: 3845 diff changeset	1734 if (!cl->is_valid_counted_loop())
6987871cfb9b 7077439: Possible reference through NULL in loopPredicate.cpp:726 kvn parents: 3845 diff changeset	1735 return; // skip malformed counted loop
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1736 Node *incr = cl->incr();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1737 if (incr == NULL)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1738 return; // Dead loop?
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1739 Node *init = cl->init_trip();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1740 Node *phi = cl->phi();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1741 int stride_con = cl->stride_con();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1742
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1743 // Visit all children, looking for Phis
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1744 for (DUIterator i = cl->outs(); cl->has_out(i); i++) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1745 Node *out = cl->out(i);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1746 // Look for other phis (secondary IVs). Skip dead ones
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1747 if (!out->is_Phi() \|\| out == phi \|\| !has_node(out))
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1748 continue;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1749 PhiNode* phi2 = out->as_Phi();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1750 Node *incr2 = phi2->in( LoopNode::LoopBackControl );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1751 // Look for induction variables of the form: X += constant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1752 if (phi2->region() != loop->_head \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1753 incr2->req() != 3 \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1754 incr2->in(1) != phi2 \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1755 incr2 == incr \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1756 incr2->Opcode() != Op_AddI \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1757 !incr2->in(2)->is_Con())
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1758 continue;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1759
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1760 // Check for parallel induction variable (parallel to trip counter)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1761 // via an affine function. In particular, count-down loops with
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1762 // count-up array indices are common. We only RCE references off
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1763 // the trip-counter, so we need to convert all these to trip-counter
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1764 // expressions.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1765 Node *init2 = phi2->in( LoopNode::EntryControl );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1766 int stride_con2 = incr2->in(2)->get_int();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1767
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1768 // The general case here gets a little tricky. We want to find the
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1769 // GCD of all possible parallel IV's and make a new IV using this
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1770 // GCD for the loop. Then all possible IVs are simple multiples of
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1771 // the GCD. In practice, this will cover very few extra loops.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1772 // Instead we require 'stride_con2' to be a multiple of 'stride_con',
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1773 // where +/-1 is the common case, but other integer multiples are
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1774 // also easy to handle.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1775 int ratio_con = stride_con2/stride_con;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1776
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1777 if ((ratio_con * stride_con) == stride_con2) { // Check for exact
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1778 #ifndef PRODUCT
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1779 if (TraceLoopOpts) {
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1780 tty->print("Parallel IV: %d ", phi2->_idx);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1781 loop->dump_head();
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1782 }
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1783 #endif
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1784 // Convert to using the trip counter. The parallel induction
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1785 // variable differs from the trip counter by a loop-invariant
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1786 // amount, the difference between their respective initial values.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1787 // It is scaled by the 'ratio_con'.
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1788 Node* ratio = _igvn.intcon(ratio_con);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1789 set_ctrl(ratio, C->root());
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1790 Node* ratio_init = new (C) MulINode(init, ratio);
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1791 _igvn.register_new_node_with_optimizer(ratio_init, init);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1792 set_early_ctrl(ratio_init);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1793 Node* diff = new (C) SubINode(init2, ratio_init);
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1794 _igvn.register_new_node_with_optimizer(diff, init2);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1795 set_early_ctrl(diff);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1796 Node* ratio_idx = new (C) MulINode(phi, ratio);
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1797 _igvn.register_new_node_with_optimizer(ratio_idx, phi);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1798 set_ctrl(ratio_idx, cl);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	1799 Node* add = new (C) AddINode(ratio_idx, diff);
3936 2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1800 _igvn.register_new_node_with_optimizer(add);
2c24ef16533d 7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64 kvn parents: 3850 diff changeset	1801 set_ctrl(add, cl);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1802 _igvn.replace_node( phi2, add );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1803 // Sometimes an induction variable is unused
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1804 if (add->outcnt() == 0) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1805 _igvn.remove_dead_node(add);
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1806 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1807 --i; // deleted this phi; rescan starting with next position
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1808 continue;
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1809 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1810 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1811 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1812
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1813 void IdealLoopTree::remove_safepoints(PhaseIdealLoop* phase, bool keep_one) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1814 Node* keep = NULL;
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1815 if (keep_one) {
23474 7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1816 // Look for a safepoint on the idom-path.
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1817 for (Node* i = tail(); i != _head; i = phase->idom(i)) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1818 if (i->Opcode() == Op_SafePoint && phase->get_loop(i) == this) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1819 keep = i;
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1820 break; // Found one
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1821 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1822 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1823 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1824
23474 7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1825 // Don't remove any safepoints if it is requested to keep a single safepoint and
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1826 // no safepoint was found on idom-path. It is not safe to remove any safepoint
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1827 // in this case since there's no safepoint dominating all paths in the loop body.
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1828 bool prune = !keep_one \|\| keep != NULL;
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1829
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1830 // Delete other safepoints in this loop.
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1831 Node_List* sfpts = _safepts;
23474 7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1832 if (prune && sfpts != NULL) {
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1833 assert(keep == NULL \|\| keep->Opcode() == Op_SafePoint, "not safepoint");
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1834 for (uint i = 0; i < sfpts->size(); i++) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1835 Node* n = sfpts->at(i);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1836 assert(phase->get_loop(n) == this, "");
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1837 if (n != keep && phase->is_deleteable_safept(n)) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1838 phase->lazy_replace(n, n->in(TypeFunc::Control));
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1839 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1840 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1841 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1842 }
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1843
0 a61af66fc99e Initial load duke parents: diff changeset	1844 //------------------------------counted_loop-----------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1845 // Convert to counted loops where possible
a61af66fc99e Initial load duke parents: diff changeset	1846 void IdealLoopTree::counted_loop( PhaseIdealLoop *phase ) {
a61af66fc99e Initial load duke parents: diff changeset	1847
a61af66fc99e Initial load duke parents: diff changeset	1848 // For grins, set the inner-loop flag here
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1849 if (!_child) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1850 if (_head->is_Loop()) _head->as_Loop()->set_inner_loop();
0 a61af66fc99e Initial load duke parents: diff changeset	1851 }
a61af66fc99e Initial load duke parents: diff changeset	1852
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1853 if (_head->is_CountedLoop() \|\|
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1854 phase->is_counted_loop(_head, this)) {
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1855
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1856 if (!UseCountedLoopSafepoints) {
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1857 // Indicate we do not need a safepoint here
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1858 _has_sfpt = 1;
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	1859 }
0 a61af66fc99e Initial load duke parents: diff changeset	1860
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1861 // Remove safepoints
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1862 bool keep_one_sfpt = !(_has_call \|\| _has_sfpt);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1863 remove_safepoints(phase, keep_one_sfpt);
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1864
0 a61af66fc99e Initial load duke parents: diff changeset	1865 // Look for induction variables
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1866 phase->replace_parallel_iv(this);
0 a61af66fc99e Initial load duke parents: diff changeset	1867
a61af66fc99e Initial load duke parents: diff changeset	1868 } else if (_parent != NULL && !_irreducible) {
23473 cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1869 // Not a counted loop. Keep one safepoint.
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1870 bool keep_one_sfpt = true;
cf93dd06db0f 6869327: Add new C2 flag to keep safepoints in counted loops. aeriksso parents: 23421 diff changeset	1871 remove_safepoints(phase, keep_one_sfpt);
0 a61af66fc99e Initial load duke parents: diff changeset	1872 }
a61af66fc99e Initial load duke parents: diff changeset	1873
a61af66fc99e Initial load duke parents: diff changeset	1874 // Recursively
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1875 if (_child) _child->counted_loop( phase );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1876 if (_next) _next ->counted_loop( phase );
0 a61af66fc99e Initial load duke parents: diff changeset	1877 }
a61af66fc99e Initial load duke parents: diff changeset	1878
a61af66fc99e Initial load duke parents: diff changeset	1879 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	1880 //------------------------------dump_head--------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1881 // Dump 1 liner for loop header info
a61af66fc99e Initial load duke parents: diff changeset	1882 void IdealLoopTree::dump_head( ) const {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1883 for (uint i=0; i<_nest; i++)
0 a61af66fc99e Initial load duke parents: diff changeset	1884 tty->print(" ");
a61af66fc99e Initial load duke parents: diff changeset	1885 tty->print("Loop: N%d/N%d ",_head->_idx,_tail->_idx);
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1886 if (_irreducible) tty->print(" IRREDUCIBLE");
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1887 Node* entry = _head->in(LoopNode::EntryControl);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1888 if (LoopLimitCheck) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1889 Node* predicate = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1890 if (predicate != NULL ) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1891 tty->print(" limit_check");
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1892 entry = entry->in(0)->in(0);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1893 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1894 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1895 if (UseLoopPredicate) {
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1896 entry = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	1897 if (entry != NULL) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1898 tty->print(" predicated");
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1899 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1900 }
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1901 if (_head->is_CountedLoop()) {
0 a61af66fc99e Initial load duke parents: diff changeset	1902 CountedLoopNode *cl = _head->as_CountedLoop();
a61af66fc99e Initial load duke parents: diff changeset	1903 tty->print(" counted");
2465 3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1904
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1905 Node* init_n = cl->init_trip();
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1906 if (init_n != NULL && init_n->is_Con())
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1907 tty->print(" [%d,", cl->init_trip()->get_int());
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1908 else
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1909 tty->print(" [int,");
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1910 Node* limit_n = cl->limit();
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1911 if (limit_n != NULL && limit_n->is_Con())
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1912 tty->print("%d),", cl->limit()->get_int());
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1913 else
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1914 tty->print("int),");
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1915 int stride_con = cl->stride_con();
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1916 if (stride_con > 0) tty->print("+");
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1917 tty->print("%d", stride_con);
3af54845df98 7004555: Add new policy for one iteration loops kvn parents: 2445 diff changeset	1918
6614 006050192a5a 6340864: Implement vectorization optimizations in hotspot-server kvn parents: 6179 diff changeset	1919 tty->print(" (%d iters) ", (int)cl->profile_trip_cnt());
006050192a5a 6340864: Implement vectorization optimizations in hotspot-server kvn parents: 6179 diff changeset	1920
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1921 if (cl->is_pre_loop ()) tty->print(" pre" );
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1922 if (cl->is_main_loop()) tty->print(" main");
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1923 if (cl->is_post_loop()) tty->print(" post");
0 a61af66fc99e Initial load duke parents: diff changeset	1924 }
23474 7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1925 if (_has_call) tty->print(" has_call");
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1926 if (_has_sfpt) tty->print(" has_sfpt");
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1927 if (_rce_candidate) tty->print(" rce");
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1928 if (_safepts != NULL && _safepts->size() > 0) {
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1929 tty->print(" sfpts={"); _safepts->dump_simple(); tty->print(" }");
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1930 }
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1931 if (_required_safept != NULL && _required_safept->size() > 0) {
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1932 tty->print(" req={"); _required_safept->dump_simple(); tty->print(" }");
7c5babab479b 8144935: C2: safepoint is pruned from a non-counted loop vlivanov parents: 23473 diff changeset	1933 }
0 a61af66fc99e Initial load duke parents: diff changeset	1934 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	1935 }
a61af66fc99e Initial load duke parents: diff changeset	1936
a61af66fc99e Initial load duke parents: diff changeset	1937 //------------------------------dump-------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	1938 // Dump loops by loop tree
a61af66fc99e Initial load duke parents: diff changeset	1939 void IdealLoopTree::dump( ) const {
a61af66fc99e Initial load duke parents: diff changeset	1940 dump_head();
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1941 if (_child) _child->dump();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1942 if (_next) _next ->dump();
0 a61af66fc99e Initial load duke parents: diff changeset	1943 }
a61af66fc99e Initial load duke parents: diff changeset	1944
a61af66fc99e Initial load duke parents: diff changeset	1945 #endif
a61af66fc99e Initial load duke parents: diff changeset	1946
367 194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1947 static void log_loop_tree(IdealLoopTree* root, IdealLoopTree* loop, CompileLog* log) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1948 if (loop == root) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1949 if (loop->_child != NULL) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1950 log->begin_head("loop_tree");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1951 log->end_head();
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1952 if( loop->_child ) log_loop_tree(root, loop->_child, log);
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1953 log->tail("loop_tree");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1954 assert(loop->_next == NULL, "what?");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1955 }
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1956 } else {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1957 Node* head = loop->_head;
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1958 log->begin_head("loop");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1959 log->print(" idx='%d' ", head->_idx);
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1960 if (loop->_irreducible) log->print("irreducible='1' ");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1961 if (head->is_Loop()) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1962 if (head->as_Loop()->is_inner_loop()) log->print("inner_loop='1' ");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1963 if (head->as_Loop()->is_partial_peel_loop()) log->print("partial_peel_loop='1' ");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1964 }
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1965 if (head->is_CountedLoop()) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1966 CountedLoopNode* cl = head->as_CountedLoop();
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1967 if (cl->is_pre_loop()) log->print("pre_loop='%d' ", cl->main_idx());
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1968 if (cl->is_main_loop()) log->print("main_loop='%d' ", cl->_idx);
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1969 if (cl->is_post_loop()) log->print("post_loop='%d' ", cl->main_idx());
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1970 }
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1971 log->end_head();
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1972 if( loop->_child ) log_loop_tree(root, loop->_child, log);
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1973 log->tail("loop");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1974 if( loop->_next ) log_loop_tree(root, loop->_next, log);
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1975 }
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1976 }
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	1977
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1978 //---------------------collect_potentially_useful_predicates-----------------------
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1979 // Helper function to collect potentially useful predicates to prevent them from
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1980 // being eliminated by PhaseIdealLoop::eliminate_useless_predicates
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1981 void PhaseIdealLoop::collect_potentially_useful_predicates(
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1982 IdealLoopTree * loop, Unique_Node_List &useful_predicates) {
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1983 if (loop->_child) { // child
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1984 collect_potentially_useful_predicates(loop->_child, useful_predicates);
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1985 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1986
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1987 // self (only loops that we can apply loop predication may use their predicates)
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1988 if (loop->_head->is_Loop() &&
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1989 !loop->_irreducible &&
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1990 !loop->tail()->is_top()) {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1991 LoopNode* lpn = loop->_head->as_Loop();
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1992 Node* entry = lpn->in(LoopNode::EntryControl);
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1993 Node* predicate_proj = find_predicate(entry); // loop_limit_check first
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1994 if (predicate_proj != NULL ) { // right pattern that can be used by loop predication
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	1995 assert(entry->in(0)->in(1)->in(1)->Opcode() == Op_Opaque1, "must be");
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	1996 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1997 entry = entry->in(0)->in(0);
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1998 }
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	1999 predicate_proj = find_predicate(entry); // Predicate
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	2000 if (predicate_proj != NULL ) {
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	2001 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2002 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2003 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2004
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2005 if (loop->_next) { // sibling
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2006 collect_potentially_useful_predicates(loop->_next, useful_predicates);
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2007 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2008 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2009
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2010 //------------------------eliminate_useless_predicates-----------------------------
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2011 // Eliminate all inserted predicates if they could not be used by loop predication.
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	2012 // Note: it will also eliminates loop limits check predicate since it also uses
bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	2013 // Opaque1 node (see Parse::add_predicate()).
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2014 void PhaseIdealLoop::eliminate_useless_predicates() {
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2015 if (C->predicate_count() == 0)
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2016 return; // no predicate left
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2017
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2018 Unique_Node_List useful_predicates; // to store useful predicates
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2019 if (C->has_loops()) {
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2020 collect_potentially_useful_predicates(_ltree_root->_child, useful_predicates);
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2021 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2022
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2023 for (int i = C->predicate_count(); i > 0; i--) {
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2024 Node * n = C->predicate_opaque1_node(i-1);
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2025 assert(n->Opcode() == Op_Opaque1, "must be");
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2026 if (!useful_predicates.member(n)) { // not in the useful list
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2027 _igvn.replace_node(n, n->in(1));
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2028 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2029 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2030 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2031
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2032 //------------------------process_expensive_nodes-----------------------------
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2033 // Expensive nodes have their control input set to prevent the GVN
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2034 // from commoning them and as a result forcing the resulting node to
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2035 // be in a more frequent path. Use CFG information here, to change the
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2036 // control inputs so that some expensive nodes can be commoned while
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2037 // not executed more frequently.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2038 bool PhaseIdealLoop::process_expensive_nodes() {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2039 assert(OptimizeExpensiveOps, "optimization off?");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2040
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2041 // Sort nodes to bring similar nodes together
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2042 C->sort_expensive_nodes();
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2043
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2044 bool progress = false;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2045
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2046 for (int i = 0; i < C->expensive_count(); ) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2047 Node* n = C->expensive_node(i);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2048 int start = i;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2049 // Find nodes similar to n
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2050 i++;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2051 for (; i < C->expensive_count() && Compile::cmp_expensive_nodes(n, C->expensive_node(i)) == 0; i++);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2052 int end = i;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2053 // And compare them two by two
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2054 for (int j = start; j < end; j++) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2055 Node* n1 = C->expensive_node(j);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2056 if (is_node_unreachable(n1)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2057 continue;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2058 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2059 for (int k = j+1; k < end; k++) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2060 Node* n2 = C->expensive_node(k);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2061 if (is_node_unreachable(n2)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2062 continue;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2063 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2064
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2065 assert(n1 != n2, "should be pair of nodes");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2066
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2067 Node* c1 = n1->in(0);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2068 Node* c2 = n2->in(0);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2069
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2070 Node* parent_c1 = c1;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2071 Node* parent_c2 = c2;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2072
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2073 // The call to get_early_ctrl_for_expensive() moves the
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2074 // expensive nodes up but stops at loops that are in a if
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2075 // branch. See whether we can exit the loop and move above the
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2076 // If.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2077 if (c1->is_Loop()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2078 parent_c1 = c1->in(1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2079 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2080 if (c2->is_Loop()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2081 parent_c2 = c2->in(1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2082 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2083
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2084 if (parent_c1 == parent_c2) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2085 _igvn._worklist.push(n1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2086 _igvn._worklist.push(n2);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2087 continue;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2088 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2089
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2090 // Look for identical expensive node up the dominator chain.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2091 if (is_dominator(c1, c2)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2092 c2 = c1;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2093 } else if (is_dominator(c2, c1)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2094 c1 = c2;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2095 } else if (parent_c1->is_Proj() && parent_c1->in(0)->is_If() &&
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2096 parent_c2->is_Proj() && parent_c1->in(0) == parent_c2->in(0)) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2097 // Both branches have the same expensive node so move it up
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2098 // before the if.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2099 c1 = c2 = idom(parent_c1->in(0));
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2100 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2101 // Do the actual moves
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2102 if (n1->in(0) != c1) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2103 _igvn.hash_delete(n1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2104 n1->set_req(0, c1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2105 _igvn.hash_insert(n1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2106 _igvn._worklist.push(n1);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2107 progress = true;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2108 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2109 if (n2->in(0) != c2) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2110 _igvn.hash_delete(n2);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2111 n2->set_req(0, c2);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2112 _igvn.hash_insert(n2);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2113 _igvn._worklist.push(n2);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2114 progress = true;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2115 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2116 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2117 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2118 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2119
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2120 return progress;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2121 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2122
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2123
0 a61af66fc99e Initial load duke parents: diff changeset	2124 //=============================================================================
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2125 //----------------------------build_and_optimize-------------------------------
0 a61af66fc99e Initial load duke parents: diff changeset	2126 // Create a PhaseLoop. Build the ideal Loop tree. Map each Ideal Node to
a61af66fc99e Initial load duke parents: diff changeset	2127 // its corresponding LoopNode. If 'optimize' is true, do some loop cleanups.
4064 670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2128 void PhaseIdealLoop::build_and_optimize(bool do_split_ifs, bool skip_loop_opts) {
2248 194c9fdee631 7017240: C2: native memory leak in nsk/regression/b4675027 on windows-x86 in comp mode with G1 kvn parents: 1972 diff changeset	2129 ResourceMark rm;
194c9fdee631 7017240: C2: native memory leak in nsk/regression/b4675027 on windows-x86 in comp mode with G1 kvn parents: 1972 diff changeset	2130
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2131 int old_progress = C->major_progress();
2403 1927db75dd85 7024475: loop doesn't terminate when compiled never parents: 2383 diff changeset	2132 uint orig_worklist_size = _igvn._worklist.size();
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2133
0 a61af66fc99e Initial load duke parents: diff changeset	2134 // Reset major-progress flag for the driver's heuristics
a61af66fc99e Initial load duke parents: diff changeset	2135 C->clear_major_progress();
a61af66fc99e Initial load duke parents: diff changeset	2136
a61af66fc99e Initial load duke parents: diff changeset	2137 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	2138 // Capture for later assert
a61af66fc99e Initial load duke parents: diff changeset	2139 uint unique = C->unique();
a61af66fc99e Initial load duke parents: diff changeset	2140 _loop_invokes++;
a61af66fc99e Initial load duke parents: diff changeset	2141 _loop_work += unique;
a61af66fc99e Initial load duke parents: diff changeset	2142 #endif
a61af66fc99e Initial load duke parents: diff changeset	2143
a61af66fc99e Initial load duke parents: diff changeset	2144 // True if the method has at least 1 irreducible loop
a61af66fc99e Initial load duke parents: diff changeset	2145 _has_irreducible_loops = false;
a61af66fc99e Initial load duke parents: diff changeset	2146
a61af66fc99e Initial load duke parents: diff changeset	2147 _created_loop_node = false;
a61af66fc99e Initial load duke parents: diff changeset	2148
a61af66fc99e Initial load duke parents: diff changeset	2149 Arena *a = Thread::current()->resource_area();
a61af66fc99e Initial load duke parents: diff changeset	2150 VectorSet visited(a);
a61af66fc99e Initial load duke parents: diff changeset	2151 // Pre-grow the mapping from Nodes to IdealLoopTrees.
a61af66fc99e Initial load duke parents: diff changeset	2152 _nodes.map(C->unique(), NULL);
a61af66fc99e Initial load duke parents: diff changeset	2153 memset(_nodes.adr(), 0, wordSize * C->unique());
a61af66fc99e Initial load duke parents: diff changeset	2154
a61af66fc99e Initial load duke parents: diff changeset	2155 // Pre-build the top-level outermost loop tree entry
a61af66fc99e Initial load duke parents: diff changeset	2156 _ltree_root = new IdealLoopTree( this, C->root(), C->root() );
a61af66fc99e Initial load duke parents: diff changeset	2157 // Do not need a safepoint at the top level
a61af66fc99e Initial load duke parents: diff changeset	2158 _ltree_root->_has_sfpt = 1;
a61af66fc99e Initial load duke parents: diff changeset	2159
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2160 // Initialize Dominators.
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2161 // Checked in clone_loop_predicate() during beautify_loops().
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2162 _idom_size = 0;
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2163 _idom = NULL;
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2164 _dom_depth = NULL;
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2165 _dom_stk = NULL;
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2166
0 a61af66fc99e Initial load duke parents: diff changeset	2167 // Empty pre-order array
a61af66fc99e Initial load duke parents: diff changeset	2168 allocate_preorders();
a61af66fc99e Initial load duke parents: diff changeset	2169
a61af66fc99e Initial load duke parents: diff changeset	2170 // Build a loop tree on the fly. Build a mapping from CFG nodes to
a61af66fc99e Initial load duke parents: diff changeset	2171 // IdealLoopTree entries. Data nodes are NOT walked.
a61af66fc99e Initial load duke parents: diff changeset	2172 build_loop_tree();
a61af66fc99e Initial load duke parents: diff changeset	2173 // Check for bailout, and return
a61af66fc99e Initial load duke parents: diff changeset	2174 if (C->failing()) {
a61af66fc99e Initial load duke parents: diff changeset	2175 return;
a61af66fc99e Initial load duke parents: diff changeset	2176 }
a61af66fc99e Initial load duke parents: diff changeset	2177
a61af66fc99e Initial load duke parents: diff changeset	2178 // No loops after all
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2179 if( !_ltree_root->_child && !_verify_only ) C->set_has_loops(false);
0 a61af66fc99e Initial load duke parents: diff changeset	2180
a61af66fc99e Initial load duke parents: diff changeset	2181 // There should always be an outer loop containing the Root and Return nodes.
a61af66fc99e Initial load duke parents: diff changeset	2182 // If not, we have a degenerate empty program. Bail out in this case.
a61af66fc99e Initial load duke parents: diff changeset	2183 if (!has_node(C->root())) {
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2184 if (!_verify_only) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2185 C->clear_major_progress();
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2186 C->record_method_not_compilable("empty program detected during loop optimization");
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2187 }
0 a61af66fc99e Initial load duke parents: diff changeset	2188 return;
a61af66fc99e Initial load duke parents: diff changeset	2189 }
a61af66fc99e Initial load duke parents: diff changeset	2190
a61af66fc99e Initial load duke parents: diff changeset	2191 // Nothing to do, so get out
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2192 bool stop_early = !C->has_loops() && !skip_loop_opts && !do_split_ifs && !_verify_me && !_verify_only;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2193 bool do_expensive_nodes = C->should_optimize_expensive_nodes(_igvn);
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2194 if (stop_early && !do_expensive_nodes) {
0 a61af66fc99e Initial load duke parents: diff changeset	2195 _igvn.optimize(); // Cleanup NeverBranches
a61af66fc99e Initial load duke parents: diff changeset	2196 return;
a61af66fc99e Initial load duke parents: diff changeset	2197 }
a61af66fc99e Initial load duke parents: diff changeset	2198
a61af66fc99e Initial load duke parents: diff changeset	2199 // Set loop nesting depth
a61af66fc99e Initial load duke parents: diff changeset	2200 _ltree_root->set_nest( 0 );
a61af66fc99e Initial load duke parents: diff changeset	2201
a61af66fc99e Initial load duke parents: diff changeset	2202 // Split shared headers and insert loop landing pads.
a61af66fc99e Initial load duke parents: diff changeset	2203 // Do not bother doing this on the Root loop of course.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2204 if( !_verify_me && !_verify_only && _ltree_root->_child ) {
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 8868 diff changeset	2205 C->print_method(PHASE_BEFORE_BEAUTIFY_LOOPS, 3);
0 a61af66fc99e Initial load duke parents: diff changeset	2206 if( _ltree_root->_child->beautify_loops( this ) ) {
a61af66fc99e Initial load duke parents: diff changeset	2207 // Re-build loop tree!
a61af66fc99e Initial load duke parents: diff changeset	2208 _ltree_root->_child = NULL;
a61af66fc99e Initial load duke parents: diff changeset	2209 _nodes.clear();
a61af66fc99e Initial load duke parents: diff changeset	2210 reallocate_preorders();
a61af66fc99e Initial load duke parents: diff changeset	2211 build_loop_tree();
a61af66fc99e Initial load duke parents: diff changeset	2212 // Check for bailout, and return
a61af66fc99e Initial load duke parents: diff changeset	2213 if (C->failing()) {
a61af66fc99e Initial load duke parents: diff changeset	2214 return;
a61af66fc99e Initial load duke parents: diff changeset	2215 }
a61af66fc99e Initial load duke parents: diff changeset	2216 // Reset loop nesting depth
a61af66fc99e Initial load duke parents: diff changeset	2217 _ltree_root->set_nest( 0 );
222 2a1a77d3458f 6718676: putback for 6604014 is incomplete never parents: 169 diff changeset	2218
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 8868 diff changeset	2219 C->print_method(PHASE_AFTER_BEAUTIFY_LOOPS, 3);
0 a61af66fc99e Initial load duke parents: diff changeset	2220 }
a61af66fc99e Initial load duke parents: diff changeset	2221 }
a61af66fc99e Initial load duke parents: diff changeset	2222
a61af66fc99e Initial load duke parents: diff changeset	2223 // Build Dominators for elision of NULL checks & loop finding.
a61af66fc99e Initial load duke parents: diff changeset	2224 // Since nodes do not have a slot for immediate dominator, make
605 98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	2225 // a persistent side array for that info indexed on node->_idx.
0 a61af66fc99e Initial load duke parents: diff changeset	2226 _idom_size = C->unique();
a61af66fc99e Initial load duke parents: diff changeset	2227 _idom = NEW_RESOURCE_ARRAY( Node*, _idom_size );
a61af66fc99e Initial load duke parents: diff changeset	2228 _dom_depth = NEW_RESOURCE_ARRAY( uint, _idom_size );
a61af66fc99e Initial load duke parents: diff changeset	2229 _dom_stk = NULL; // Allocated on demand in recompute_dom_depth
a61af66fc99e Initial load duke parents: diff changeset	2230 memset( _dom_depth, 0, _idom_size * sizeof(uint) );
a61af66fc99e Initial load duke parents: diff changeset	2231
a61af66fc99e Initial load duke parents: diff changeset	2232 Dominators();
a61af66fc99e Initial load duke parents: diff changeset	2233
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2234 if (!_verify_only) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2235 // As a side effect, Dominators removed any unreachable CFG paths
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2236 // into RegionNodes. It doesn't do this test against Root, so
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2237 // we do it here.
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2238 for( uint i = 1; i < C->root()->req(); i++ ) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2239 if( !_nodes[C->root()->in(i)->_idx] ) { // Dead path into Root?
6144 5e990493719e 7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node, int, Node) where applicable kvn parents: 4862 diff changeset	2240 _igvn.delete_input_of(C->root(), i);
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2241 i--; // Rerun same iteration on compressed edges
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2242 }
0 a61af66fc99e Initial load duke parents: diff changeset	2243 }
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2244
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2245 // Given dominators, try to find inner loops with calls that must
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2246 // always be executed (call dominates loop tail). These loops do
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2247 // not need a separate safepoint.
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2248 Node_List cisstack(a);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2249 _ltree_root->check_safepts(visited, cisstack);
0 a61af66fc99e Initial load duke parents: diff changeset	2250 }
a61af66fc99e Initial load duke parents: diff changeset	2251
a61af66fc99e Initial load duke parents: diff changeset	2252 // Walk the DATA nodes and place into loops. Find earliest control
a61af66fc99e Initial load duke parents: diff changeset	2253 // node. For CFG nodes, the _nodes array starts out and remains
a61af66fc99e Initial load duke parents: diff changeset	2254 // holding the associated IdealLoopTree pointer. For DATA nodes, the
a61af66fc99e Initial load duke parents: diff changeset	2255 // _nodes array holds the earliest legal controlling CFG node.
a61af66fc99e Initial load duke parents: diff changeset	2256
a61af66fc99e Initial load duke parents: diff changeset	2257 // Allocate stack with enough space to avoid frequent realloc
23421 c1091733abe6 8011858: Use Compile::live_nodes() instead of Compile::unique() in appropriate places zmajo parents: 22842 diff changeset	2258 int stack_size = (C->live_nodes() >> 1) + 16; // (live_nodes>>1)+16 from Java2D stats
0 a61af66fc99e Initial load duke parents: diff changeset	2259 Node_Stack nstack( a, stack_size );
a61af66fc99e Initial load duke parents: diff changeset	2260
a61af66fc99e Initial load duke parents: diff changeset	2261 visited.Clear();
a61af66fc99e Initial load duke parents: diff changeset	2262 Node_List worklist(a);
a61af66fc99e Initial load duke parents: diff changeset	2263 // Don't need C->root() on worklist since
a61af66fc99e Initial load duke parents: diff changeset	2264 // it will be processed among C->top() inputs
a61af66fc99e Initial load duke parents: diff changeset	2265 worklist.push( C->top() );
a61af66fc99e Initial load duke parents: diff changeset	2266 visited.set( C->top()->_idx ); // Set C->top() as visited now
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2267 build_loop_early( visited, worklist, nstack );
0 a61af66fc99e Initial load duke parents: diff changeset	2268
a61af66fc99e Initial load duke parents: diff changeset	2269 // Given early legal placement, try finding counted loops. This placement
a61af66fc99e Initial load duke parents: diff changeset	2270 // is good enough to discover most loop invariants.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2271 if( !_verify_me && !_verify_only )
0 a61af66fc99e Initial load duke parents: diff changeset	2272 _ltree_root->counted_loop( this );
a61af66fc99e Initial load duke parents: diff changeset	2273
a61af66fc99e Initial load duke parents: diff changeset	2274 // Find latest loop placement. Find ideal loop placement.
a61af66fc99e Initial load duke parents: diff changeset	2275 visited.Clear();
a61af66fc99e Initial load duke parents: diff changeset	2276 init_dom_lca_tags();
a61af66fc99e Initial load duke parents: diff changeset	2277 // Need C->root() on worklist when processing outs
a61af66fc99e Initial load duke parents: diff changeset	2278 worklist.push( C->root() );
a61af66fc99e Initial load duke parents: diff changeset	2279 NOT_PRODUCT( C->verify_graph_edges(); )
a61af66fc99e Initial load duke parents: diff changeset	2280 worklist.push( C->top() );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2281 build_loop_late( visited, worklist, nstack );
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2282
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2283 if (_verify_only) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2284 // restore major progress flag
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2285 for (int i = 0; i < old_progress; i++)
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2286 C->set_major_progress();
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2287 assert(C->unique() == unique, "verification mode made Nodes? ? ?");
2403 1927db75dd85 7024475: loop doesn't terminate when compiled never parents: 2383 diff changeset	2288 assert(_igvn._worklist.size() == orig_worklist_size, "shouldn't push anything");
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2289 return;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2290 }
0 a61af66fc99e Initial load duke parents: diff changeset	2291
8868 30f42e691e70 8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address kvn parents: 8048 diff changeset	2292 // clear out the dead code after build_loop_late
30f42e691e70 8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address kvn parents: 8048 diff changeset	2293 while (_deadlist.size()) {
30f42e691e70 8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address kvn parents: 8048 diff changeset	2294 _igvn.remove_globally_dead_node(_deadlist.pop());
30f42e691e70 8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address kvn parents: 8048 diff changeset	2295 }
30f42e691e70 8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address kvn parents: 8048 diff changeset	2296
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2297 if (stop_early) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2298 assert(do_expensive_nodes, "why are we here?");
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2299 if (process_expensive_nodes()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2300 // If we made some progress when processing expensive nodes then
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2301 // the IGVN may modify the graph in a way that will allow us to
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2302 // make some more progress: we need to try processing expensive
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2303 // nodes again.
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2304 C->set_major_progress();
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2305 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2306 _igvn.optimize();
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2307 return;
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2308 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2309
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2310 // Some parser-inserted loop predicates could never be used by loop
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2311 // predication or they were moved away from loop during some optimizations.
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2312 // For example, peeling. Eliminate them before next loop optimizations.
3345 bad7ecd0b6ed 5091921: Sign flip issues in loop optimizer kvn parents: 2465 diff changeset	2313 if (UseLoopPredicate \|\| LoopLimitCheck) {
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2314 eliminate_useless_predicates();
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2315 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2316
0 a61af66fc99e Initial load duke parents: diff changeset	2317 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	2318 C->verify_graph_edges();
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2319 if (_verify_me) { // Nested verify pass?
0 a61af66fc99e Initial load duke parents: diff changeset	2320 // Check to see if the verify mode is broken
a61af66fc99e Initial load duke parents: diff changeset	2321 assert(C->unique() == unique, "non-optimize mode made Nodes? ? ?");
a61af66fc99e Initial load duke parents: diff changeset	2322 return;
a61af66fc99e Initial load duke parents: diff changeset	2323 }
2383 9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2324 if(VerifyLoopOptimizations) verify();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2325 if(TraceLoopOpts && C->has_loops()) {
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2326 _ltree_root->dump();
9dc311b8473e 7008866: Missing loop predicate for loop with multiple entries kvn parents: 2248 diff changeset	2327 }
0 a61af66fc99e Initial load duke parents: diff changeset	2328 #endif
a61af66fc99e Initial load duke parents: diff changeset	2329
4064 670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2330 if (skip_loop_opts) {
23484 501f014415d8 8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true thartmann parents: 23474 diff changeset	2331 // restore major progress flag
501f014415d8 8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true thartmann parents: 23474 diff changeset	2332 for (int i = 0; i < old_progress; i++) {
501f014415d8 8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true thartmann parents: 23474 diff changeset	2333 C->set_major_progress();
501f014415d8 8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true thartmann parents: 23474 diff changeset	2334 }
501f014415d8 8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true thartmann parents: 23474 diff changeset	2335
4064 670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2336 // Cleanup any modified bits
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2337 _igvn.optimize();
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2338
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2339 if (C->log() != NULL) {
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2340 log_loop_tree(_ltree_root, _ltree_root, C->log());
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2341 }
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2342 return;
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2343 }
670a74b863fc 7107042: assert(no_dead_loop) failed: dead loop detected kvn parents: 3936 diff changeset	2344
0 a61af66fc99e Initial load duke parents: diff changeset	2345 if (ReassociateInvariants) {
a61af66fc99e Initial load duke parents: diff changeset	2346 // Reassociate invariants and prep for split_thru_phi
a61af66fc99e Initial load duke parents: diff changeset	2347 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) {
a61af66fc99e Initial load duke parents: diff changeset	2348 IdealLoopTree* lpt = iter.current();
a61af66fc99e Initial load duke parents: diff changeset	2349 if (!lpt->is_counted() \|\| !lpt->is_inner()) continue;
a61af66fc99e Initial load duke parents: diff changeset	2350
a61af66fc99e Initial load duke parents: diff changeset	2351 lpt->reassociate_invariants(this);
a61af66fc99e Initial load duke parents: diff changeset	2352
a61af66fc99e Initial load duke parents: diff changeset	2353 // Because RCE opportunities can be masked by split_thru_phi,
a61af66fc99e Initial load duke parents: diff changeset	2354 // look for RCE candidates and inhibit split_thru_phi
a61af66fc99e Initial load duke parents: diff changeset	2355 // on just their loop-phi's for this pass of loop opts
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2356 if (SplitIfBlocks && do_split_ifs) {
0 a61af66fc99e Initial load duke parents: diff changeset	2357 if (lpt->policy_range_check(this)) {
39 76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	2358 lpt->_rce_candidate = 1; // = true
0 a61af66fc99e Initial load duke parents: diff changeset	2359 }
a61af66fc99e Initial load duke parents: diff changeset	2360 }
a61af66fc99e Initial load duke parents: diff changeset	2361 }
a61af66fc99e Initial load duke parents: diff changeset	2362 }
a61af66fc99e Initial load duke parents: diff changeset	2363
a61af66fc99e Initial load duke parents: diff changeset	2364 // Check for aggressive application of split-if and other transforms
a61af66fc99e Initial load duke parents: diff changeset	2365 // that require basic-block info (like cloning through Phi's)
a61af66fc99e Initial load duke parents: diff changeset	2366 if( SplitIfBlocks && do_split_ifs ) {
a61af66fc99e Initial load duke parents: diff changeset	2367 visited.Clear();
a61af66fc99e Initial load duke parents: diff changeset	2368 split_if_with_blocks( visited, nstack );
a61af66fc99e Initial load duke parents: diff changeset	2369 NOT_PRODUCT( if( VerifyLoopOptimizations ) verify(); );
a61af66fc99e Initial load duke parents: diff changeset	2370 }
a61af66fc99e Initial load duke parents: diff changeset	2371
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2372 if (!C->major_progress() && do_expensive_nodes && process_expensive_nodes()) {
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2373 C->set_major_progress();
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2374 }
8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	2375
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2376 // Perform loop predication before iteration splitting
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2377 if (C->has_loops() && !C->major_progress() && (C->predicate_count() > 0)) {
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2378 _ltree_root->_child->loop_predication(this);
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2379 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2380
1763 d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2381 if (OptimizeFill && UseLoopPredicate && C->has_loops() && !C->major_progress()) {
d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2382 if (do_intrinsify_fill()) {
d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2383 C->set_major_progress();
d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2384 }
d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2385 }
d6f45b55c972 4809552: Optimize Arrays.fill(...) never parents: 1621 diff changeset	2386
0 a61af66fc99e Initial load duke parents: diff changeset	2387 // Perform iteration-splitting on inner loops. Split iterations to avoid
a61af66fc99e Initial load duke parents: diff changeset	2388 // range checks or one-shot null checks.
a61af66fc99e Initial load duke parents: diff changeset	2389
a61af66fc99e Initial load duke parents: diff changeset	2390 // If split-if's didn't hack the graph too bad (no CFG changes)
a61af66fc99e Initial load duke parents: diff changeset	2391 // then do loop opts.
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2392 if (C->has_loops() && !C->major_progress()) {
0 a61af66fc99e Initial load duke parents: diff changeset	2393 memset( worklist.adr(), 0, worklist.Size()sizeof(Node) );
a61af66fc99e Initial load duke parents: diff changeset	2394 _ltree_root->_child->iteration_split( this, worklist );
a61af66fc99e Initial load duke parents: diff changeset	2395 // No verify after peeling! GCM has hoisted code out of the loop.
a61af66fc99e Initial load duke parents: diff changeset	2396 // After peeling, the hoisted code could sink inside the peeled area.
a61af66fc99e Initial load duke parents: diff changeset	2397 // The peeling code does not try to recompute the best location for
a61af66fc99e Initial load duke parents: diff changeset	2398 // all the code before the peeled area, so the verify pass will always
a61af66fc99e Initial load duke parents: diff changeset	2399 // complain about it.
a61af66fc99e Initial load duke parents: diff changeset	2400 }
a61af66fc99e Initial load duke parents: diff changeset	2401 // Do verify graph edges in any case
a61af66fc99e Initial load duke parents: diff changeset	2402 NOT_PRODUCT( C->verify_graph_edges(); );
a61af66fc99e Initial load duke parents: diff changeset	2403
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	2404 if (!do_split_ifs) {
0 a61af66fc99e Initial load duke parents: diff changeset	2405 // We saw major progress in Split-If to get here. We forced a
a61af66fc99e Initial load duke parents: diff changeset	2406 // pass with unrolling and not split-if, however more split-if's
a61af66fc99e Initial load duke parents: diff changeset	2407 // might make progress. If the unrolling didn't make progress
a61af66fc99e Initial load duke parents: diff changeset	2408 // then the major-progress flag got cleared and we won't try
a61af66fc99e Initial load duke parents: diff changeset	2409 // another round of Split-If. In particular the ever-common
a61af66fc99e Initial load duke parents: diff changeset	2410 // instance-of/check-cast pattern requires at least 2 rounds of
a61af66fc99e Initial load duke parents: diff changeset	2411 // Split-If to clear out.
a61af66fc99e Initial load duke parents: diff changeset	2412 C->set_major_progress();
a61af66fc99e Initial load duke parents: diff changeset	2413 }
a61af66fc99e Initial load duke parents: diff changeset	2414
a61af66fc99e Initial load duke parents: diff changeset	2415 // Repeat loop optimizations if new loops were seen
a61af66fc99e Initial load duke parents: diff changeset	2416 if (created_loop_node()) {
a61af66fc99e Initial load duke parents: diff changeset	2417 C->set_major_progress();
a61af66fc99e Initial load duke parents: diff changeset	2418 }
a61af66fc99e Initial load duke parents: diff changeset	2419
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2420 // Keep loop predicates and perform optimizations with them
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2421 // until no more loop optimizations could be done.
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2422 // After that switch predicates off and do more loop optimizations.
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2423 if (!C->major_progress() && (C->predicate_count() > 0)) {
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2424 C->cleanup_loop_predicates(_igvn);
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2425 #ifndef PRODUCT
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2426 if (TraceLoopOpts) {
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2427 tty->print_cr("PredicatesOff");
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2428 }
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2429 #endif
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2430 C->set_major_progress();
08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2431 }
0 a61af66fc99e Initial load duke parents: diff changeset	2432
2445 08eb13460b3a 7004535: Clone loop predicate during loop unswitch kvn parents: 2403 diff changeset	2433 // Convert scalar to superword operations at the end of all loop opts.
0 a61af66fc99e Initial load duke parents: diff changeset	2434 if (UseSuperWord && C->has_loops() && !C->major_progress()) {
a61af66fc99e Initial load duke parents: diff changeset	2435 // SuperWord transform
a61af66fc99e Initial load duke parents: diff changeset	2436 SuperWord sw(this);
a61af66fc99e Initial load duke parents: diff changeset	2437 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) {
a61af66fc99e Initial load duke parents: diff changeset	2438 IdealLoopTree* lpt = iter.current();
a61af66fc99e Initial load duke parents: diff changeset	2439 if (lpt->is_counted()) {
a61af66fc99e Initial load duke parents: diff changeset	2440 sw.transform_loop(lpt);
a61af66fc99e Initial load duke parents: diff changeset	2441 }
a61af66fc99e Initial load duke parents: diff changeset	2442 }
a61af66fc99e Initial load duke parents: diff changeset	2443 }
a61af66fc99e Initial load duke parents: diff changeset	2444
a61af66fc99e Initial load duke parents: diff changeset	2445 // Cleanup any modified bits
a61af66fc99e Initial load duke parents: diff changeset	2446 _igvn.optimize();
a61af66fc99e Initial load duke parents: diff changeset	2447
367 194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2448 // disable assert until issue with split_flow_path is resolved (6742111)
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2449 // assert(!_has_irreducible_loops \|\| C->parsed_irreducible_loop() \|\| C->is_osr_compilation(),
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2450 // "shouldn't introduce irreducible loops");
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2451
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2452 if (C->log() != NULL) {
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2453 log_loop_tree(_ltree_root, _ltree_root, C->log());
194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	2454 }
0 a61af66fc99e Initial load duke parents: diff changeset	2455 }
a61af66fc99e Initial load duke parents: diff changeset	2456
a61af66fc99e Initial load duke parents: diff changeset	2457 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	2458 //------------------------------print_statistics-------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2459 int PhaseIdealLoop::_loop_invokes=0;// Count of PhaseIdealLoop invokes
a61af66fc99e Initial load duke parents: diff changeset	2460 int PhaseIdealLoop::_loop_work=0; // Sum of PhaseIdealLoop x unique
a61af66fc99e Initial load duke parents: diff changeset	2461 void PhaseIdealLoop::print_statistics() {
a61af66fc99e Initial load duke parents: diff changeset	2462 tty->print_cr("PhaseIdealLoop=%d, sum _unique=%d", _loop_invokes, _loop_work);
a61af66fc99e Initial load duke parents: diff changeset	2463 }
a61af66fc99e Initial load duke parents: diff changeset	2464
a61af66fc99e Initial load duke parents: diff changeset	2465 //------------------------------verify-----------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2466 // Build a verify-only PhaseIdealLoop, and see that it agrees with me.
a61af66fc99e Initial load duke parents: diff changeset	2467 static int fail; // debug only, so its multi-thread dont care
a61af66fc99e Initial load duke parents: diff changeset	2468 void PhaseIdealLoop::verify() const {
a61af66fc99e Initial load duke parents: diff changeset	2469 int old_progress = C->major_progress();
a61af66fc99e Initial load duke parents: diff changeset	2470 ResourceMark rm;
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2471 PhaseIdealLoop loop_verify( _igvn, this );
0 a61af66fc99e Initial load duke parents: diff changeset	2472 VectorSet visited(Thread::current()->resource_area());
a61af66fc99e Initial load duke parents: diff changeset	2473
a61af66fc99e Initial load duke parents: diff changeset	2474 fail = 0;
a61af66fc99e Initial load duke parents: diff changeset	2475 verify_compare( C->root(), &loop_verify, visited );
a61af66fc99e Initial load duke parents: diff changeset	2476 assert( fail == 0, "verify loops failed" );
a61af66fc99e Initial load duke parents: diff changeset	2477 // Verify loop structure is the same
a61af66fc99e Initial load duke parents: diff changeset	2478 _ltree_root->verify_tree(loop_verify._ltree_root, NULL);
a61af66fc99e Initial load duke parents: diff changeset	2479 // Reset major-progress. It was cleared by creating a verify version of
a61af66fc99e Initial load duke parents: diff changeset	2480 // PhaseIdealLoop.
a61af66fc99e Initial load duke parents: diff changeset	2481 for( int i=0; i<old_progress; i++ )
a61af66fc99e Initial load duke parents: diff changeset	2482 C->set_major_progress();
a61af66fc99e Initial load duke parents: diff changeset	2483 }
a61af66fc99e Initial load duke parents: diff changeset	2484
a61af66fc99e Initial load duke parents: diff changeset	2485 //------------------------------verify_compare---------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2486 // Make sure me and the given PhaseIdealLoop agree on key data structures
a61af66fc99e Initial load duke parents: diff changeset	2487 void PhaseIdealLoop::verify_compare( Node n, const PhaseIdealLoop loop_verify, VectorSet &visited ) const {
a61af66fc99e Initial load duke parents: diff changeset	2488 if( !n ) return;
a61af66fc99e Initial load duke parents: diff changeset	2489 if( visited.test_set( n->_idx ) ) return;
a61af66fc99e Initial load duke parents: diff changeset	2490 if( !_nodes[n->_idx] ) { // Unreachable
a61af66fc99e Initial load duke parents: diff changeset	2491 assert( !loop_verify->_nodes[n->_idx], "both should be unreachable" );
a61af66fc99e Initial load duke parents: diff changeset	2492 return;
a61af66fc99e Initial load duke parents: diff changeset	2493 }
a61af66fc99e Initial load duke parents: diff changeset	2494
a61af66fc99e Initial load duke parents: diff changeset	2495 uint i;
a61af66fc99e Initial load duke parents: diff changeset	2496 for( i = 0; i < n->req(); i++ )
a61af66fc99e Initial load duke parents: diff changeset	2497 verify_compare( n->in(i), loop_verify, visited );
a61af66fc99e Initial load duke parents: diff changeset	2498
a61af66fc99e Initial load duke parents: diff changeset	2499 // Check the '_nodes' block/loop structure
a61af66fc99e Initial load duke parents: diff changeset	2500 i = n->_idx;
a61af66fc99e Initial load duke parents: diff changeset	2501 if( has_ctrl(n) ) { // We have control; verify has loop or ctrl
a61af66fc99e Initial load duke parents: diff changeset	2502 if( _nodes[i] != loop_verify->_nodes[i] &&
a61af66fc99e Initial load duke parents: diff changeset	2503 get_ctrl_no_update(n) != loop_verify->get_ctrl_no_update(n) ) {
a61af66fc99e Initial load duke parents: diff changeset	2504 tty->print("Mismatched control setting for: ");
a61af66fc99e Initial load duke parents: diff changeset	2505 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2506 if( fail++ > 10 ) return;
a61af66fc99e Initial load duke parents: diff changeset	2507 Node *c = get_ctrl_no_update(n);
a61af66fc99e Initial load duke parents: diff changeset	2508 tty->print("We have it as: ");
a61af66fc99e Initial load duke parents: diff changeset	2509 if( c->in(0) ) c->dump();
a61af66fc99e Initial load duke parents: diff changeset	2510 else tty->print_cr("N%d",c->_idx);
a61af66fc99e Initial load duke parents: diff changeset	2511 tty->print("Verify thinks: ");
a61af66fc99e Initial load duke parents: diff changeset	2512 if( loop_verify->has_ctrl(n) )
a61af66fc99e Initial load duke parents: diff changeset	2513 loop_verify->get_ctrl_no_update(n)->dump();
a61af66fc99e Initial load duke parents: diff changeset	2514 else
a61af66fc99e Initial load duke parents: diff changeset	2515 loop_verify->get_loop_idx(n)->dump();
a61af66fc99e Initial load duke parents: diff changeset	2516 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	2517 }
a61af66fc99e Initial load duke parents: diff changeset	2518 } else { // We have a loop
a61af66fc99e Initial load duke parents: diff changeset	2519 IdealLoopTree *us = get_loop_idx(n);
a61af66fc99e Initial load duke parents: diff changeset	2520 if( loop_verify->has_ctrl(n) ) {
a61af66fc99e Initial load duke parents: diff changeset	2521 tty->print("Mismatched loop setting for: ");
a61af66fc99e Initial load duke parents: diff changeset	2522 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2523 if( fail++ > 10 ) return;
a61af66fc99e Initial load duke parents: diff changeset	2524 tty->print("We have it as: ");
a61af66fc99e Initial load duke parents: diff changeset	2525 us->dump();
a61af66fc99e Initial load duke parents: diff changeset	2526 tty->print("Verify thinks: ");
a61af66fc99e Initial load duke parents: diff changeset	2527 loop_verify->get_ctrl_no_update(n)->dump();
a61af66fc99e Initial load duke parents: diff changeset	2528 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	2529 } else if (!C->major_progress()) {
a61af66fc99e Initial load duke parents: diff changeset	2530 // Loop selection can be messed up if we did a major progress
a61af66fc99e Initial load duke parents: diff changeset	2531 // operation, like split-if. Do not verify in that case.
a61af66fc99e Initial load duke parents: diff changeset	2532 IdealLoopTree *them = loop_verify->get_loop_idx(n);
a61af66fc99e Initial load duke parents: diff changeset	2533 if( us->_head != them->_head \|\| us->_tail != them->_tail ) {
a61af66fc99e Initial load duke parents: diff changeset	2534 tty->print("Unequals loops for: ");
a61af66fc99e Initial load duke parents: diff changeset	2535 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2536 if( fail++ > 10 ) return;
a61af66fc99e Initial load duke parents: diff changeset	2537 tty->print("We have it as: ");
a61af66fc99e Initial load duke parents: diff changeset	2538 us->dump();
a61af66fc99e Initial load duke parents: diff changeset	2539 tty->print("Verify thinks: ");
a61af66fc99e Initial load duke parents: diff changeset	2540 them->dump();
a61af66fc99e Initial load duke parents: diff changeset	2541 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	2542 }
a61af66fc99e Initial load duke parents: diff changeset	2543 }
a61af66fc99e Initial load duke parents: diff changeset	2544 }
a61af66fc99e Initial load duke parents: diff changeset	2545
a61af66fc99e Initial load duke parents: diff changeset	2546 // Check for immediate dominators being equal
a61af66fc99e Initial load duke parents: diff changeset	2547 if( i >= _idom_size ) {
a61af66fc99e Initial load duke parents: diff changeset	2548 if( !n->is_CFG() ) return;
a61af66fc99e Initial load duke parents: diff changeset	2549 tty->print("CFG Node with no idom: ");
a61af66fc99e Initial load duke parents: diff changeset	2550 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2551 return;
a61af66fc99e Initial load duke parents: diff changeset	2552 }
a61af66fc99e Initial load duke parents: diff changeset	2553 if( !n->is_CFG() ) return;
a61af66fc99e Initial load duke parents: diff changeset	2554 if( n == C->root() ) return; // No IDOM here
a61af66fc99e Initial load duke parents: diff changeset	2555
a61af66fc99e Initial load duke parents: diff changeset	2556 assert(n->_idx == i, "sanity");
a61af66fc99e Initial load duke parents: diff changeset	2557 Node *id = idom_no_update(n);
a61af66fc99e Initial load duke parents: diff changeset	2558 if( id != loop_verify->idom_no_update(n) ) {
a61af66fc99e Initial load duke parents: diff changeset	2559 tty->print("Unequals idoms for: ");
a61af66fc99e Initial load duke parents: diff changeset	2560 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2561 if( fail++ > 10 ) return;
a61af66fc99e Initial load duke parents: diff changeset	2562 tty->print("We have it as: ");
a61af66fc99e Initial load duke parents: diff changeset	2563 id->dump();
a61af66fc99e Initial load duke parents: diff changeset	2564 tty->print("Verify thinks: ");
a61af66fc99e Initial load duke parents: diff changeset	2565 loop_verify->idom_no_update(n)->dump();
a61af66fc99e Initial load duke parents: diff changeset	2566 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	2567 }
a61af66fc99e Initial load duke parents: diff changeset	2568
a61af66fc99e Initial load duke parents: diff changeset	2569 }
a61af66fc99e Initial load duke parents: diff changeset	2570
a61af66fc99e Initial load duke parents: diff changeset	2571 //------------------------------verify_tree------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2572 // Verify that tree structures match. Because the CFG can change, siblings
a61af66fc99e Initial load duke parents: diff changeset	2573 // within the loop tree can be reordered. We attempt to deal with that by
a61af66fc99e Initial load duke parents: diff changeset	2574 // reordering the verify's loop tree if possible.
a61af66fc99e Initial load duke parents: diff changeset	2575 void IdealLoopTree::verify_tree(IdealLoopTree loop, const IdealLoopTree parent) const {
a61af66fc99e Initial load duke parents: diff changeset	2576 assert( _parent == parent, "Badly formed loop tree" );
a61af66fc99e Initial load duke parents: diff changeset	2577
a61af66fc99e Initial load duke parents: diff changeset	2578 // Siblings not in same order? Attempt to re-order.
a61af66fc99e Initial load duke parents: diff changeset	2579 if( _head != loop->_head ) {
a61af66fc99e Initial load duke parents: diff changeset	2580 // Find _next pointer to update
a61af66fc99e Initial load duke parents: diff changeset	2581 IdealLoopTree **pp = &loop->_parent->_child;
a61af66fc99e Initial load duke parents: diff changeset	2582 while( *pp != loop )
a61af66fc99e Initial load duke parents: diff changeset	2583 pp = &((*pp)->_next);
a61af66fc99e Initial load duke parents: diff changeset	2584 // Find proper sibling to be next
a61af66fc99e Initial load duke parents: diff changeset	2585 IdealLoopTree **nn = &loop->_next;
a61af66fc99e Initial load duke parents: diff changeset	2586 while( (nn) && (nn)->_head != _head )
a61af66fc99e Initial load duke parents: diff changeset	2587 nn = &((*nn)->_next);
a61af66fc99e Initial load duke parents: diff changeset	2588
a61af66fc99e Initial load duke parents: diff changeset	2589 // Check for no match.
a61af66fc99e Initial load duke parents: diff changeset	2590 if( !(*nn) ) {
a61af66fc99e Initial load duke parents: diff changeset	2591 // Annoyingly, irreducible loops can pick different headers
a61af66fc99e Initial load duke parents: diff changeset	2592 // after a major_progress operation, so the rest of the loop
a61af66fc99e Initial load duke parents: diff changeset	2593 // tree cannot be matched.
a61af66fc99e Initial load duke parents: diff changeset	2594 if (_irreducible && Compile::current()->major_progress()) return;
a61af66fc99e Initial load duke parents: diff changeset	2595 assert( 0, "failed to match loop tree" );
a61af66fc99e Initial load duke parents: diff changeset	2596 }
a61af66fc99e Initial load duke parents: diff changeset	2597
a61af66fc99e Initial load duke parents: diff changeset	2598 // Move (nn) to (pp)
a61af66fc99e Initial load duke parents: diff changeset	2599 IdealLoopTree hit = nn;
a61af66fc99e Initial load duke parents: diff changeset	2600 *nn = hit->_next;
a61af66fc99e Initial load duke parents: diff changeset	2601 hit->_next = loop;
a61af66fc99e Initial load duke parents: diff changeset	2602 *pp = loop;
a61af66fc99e Initial load duke parents: diff changeset	2603 loop = hit;
a61af66fc99e Initial load duke parents: diff changeset	2604 // Now try again to verify
a61af66fc99e Initial load duke parents: diff changeset	2605 }
a61af66fc99e Initial load duke parents: diff changeset	2606
a61af66fc99e Initial load duke parents: diff changeset	2607 assert( _head == loop->_head , "mismatched loop head" );
a61af66fc99e Initial load duke parents: diff changeset	2608 Node *tail = _tail; // Inline a non-updating version of
a61af66fc99e Initial load duke parents: diff changeset	2609 while( !tail->in(0) ) // the 'tail()' call.
a61af66fc99e Initial load duke parents: diff changeset	2610 tail = tail->in(1);
a61af66fc99e Initial load duke parents: diff changeset	2611 assert( tail == loop->_tail, "mismatched loop tail" );
a61af66fc99e Initial load duke parents: diff changeset	2612
a61af66fc99e Initial load duke parents: diff changeset	2613 // Counted loops that are guarded should be able to find their guards
a61af66fc99e Initial load duke parents: diff changeset	2614 if( _head->is_CountedLoop() && _head->as_CountedLoop()->is_main_loop() ) {
a61af66fc99e Initial load duke parents: diff changeset	2615 CountedLoopNode *cl = _head->as_CountedLoop();
a61af66fc99e Initial load duke parents: diff changeset	2616 Node *init = cl->init_trip();
a61af66fc99e Initial load duke parents: diff changeset	2617 Node *ctrl = cl->in(LoopNode::EntryControl);
a61af66fc99e Initial load duke parents: diff changeset	2618 assert( ctrl->Opcode() == Op_IfTrue \|\| ctrl->Opcode() == Op_IfFalse, "" );
a61af66fc99e Initial load duke parents: diff changeset	2619 Node *iff = ctrl->in(0);
a61af66fc99e Initial load duke parents: diff changeset	2620 assert( iff->Opcode() == Op_If, "" );
a61af66fc99e Initial load duke parents: diff changeset	2621 Node *bol = iff->in(1);
a61af66fc99e Initial load duke parents: diff changeset	2622 assert( bol->Opcode() == Op_Bool, "" );
a61af66fc99e Initial load duke parents: diff changeset	2623 Node *cmp = bol->in(1);
a61af66fc99e Initial load duke parents: diff changeset	2624 assert( cmp->Opcode() == Op_CmpI, "" );
a61af66fc99e Initial load duke parents: diff changeset	2625 Node *add = cmp->in(1);
a61af66fc99e Initial load duke parents: diff changeset	2626 Node *opaq;
a61af66fc99e Initial load duke parents: diff changeset	2627 if( add->Opcode() == Op_Opaque1 ) {
a61af66fc99e Initial load duke parents: diff changeset	2628 opaq = add;
a61af66fc99e Initial load duke parents: diff changeset	2629 } else {
a61af66fc99e Initial load duke parents: diff changeset	2630 assert( add->Opcode() == Op_AddI \|\| add->Opcode() == Op_ConI , "" );
a61af66fc99e Initial load duke parents: diff changeset	2631 assert( add == init, "" );
a61af66fc99e Initial load duke parents: diff changeset	2632 opaq = cmp->in(2);
a61af66fc99e Initial load duke parents: diff changeset	2633 }
a61af66fc99e Initial load duke parents: diff changeset	2634 assert( opaq->Opcode() == Op_Opaque1, "" );
a61af66fc99e Initial load duke parents: diff changeset	2635
a61af66fc99e Initial load duke parents: diff changeset	2636 }
a61af66fc99e Initial load duke parents: diff changeset	2637
a61af66fc99e Initial load duke parents: diff changeset	2638 if (_child != NULL) _child->verify_tree(loop->_child, this);
a61af66fc99e Initial load duke parents: diff changeset	2639 if (_next != NULL) _next ->verify_tree(loop->_next, parent);
a61af66fc99e Initial load duke parents: diff changeset	2640 // Innermost loops need to verify loop bodies,
a61af66fc99e Initial load duke parents: diff changeset	2641 // but only if no 'major_progress'
a61af66fc99e Initial load duke parents: diff changeset	2642 int fail = 0;
a61af66fc99e Initial load duke parents: diff changeset	2643 if (!Compile::current()->major_progress() && _child == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	2644 for( uint i = 0; i < _body.size(); i++ ) {
a61af66fc99e Initial load duke parents: diff changeset	2645 Node *n = _body.at(i);
a61af66fc99e Initial load duke parents: diff changeset	2646 if (n->outcnt() == 0) continue; // Ignore dead
a61af66fc99e Initial load duke parents: diff changeset	2647 uint j;
a61af66fc99e Initial load duke parents: diff changeset	2648 for( j = 0; j < loop->_body.size(); j++ )
a61af66fc99e Initial load duke parents: diff changeset	2649 if( loop->_body.at(j) == n )
a61af66fc99e Initial load duke parents: diff changeset	2650 break;
a61af66fc99e Initial load duke parents: diff changeset	2651 if( j == loop->_body.size() ) { // Not found in loop body
a61af66fc99e Initial load duke parents: diff changeset	2652 // Last ditch effort to avoid assertion: Its possible that we
a61af66fc99e Initial load duke parents: diff changeset	2653 // have some users (so outcnt not zero) but are still dead.
a61af66fc99e Initial load duke parents: diff changeset	2654 // Try to find from root.
a61af66fc99e Initial load duke parents: diff changeset	2655 if (Compile::current()->root()->find(n->_idx)) {
a61af66fc99e Initial load duke parents: diff changeset	2656 fail++;
a61af66fc99e Initial load duke parents: diff changeset	2657 tty->print("We have that verify does not: ");
a61af66fc99e Initial load duke parents: diff changeset	2658 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2659 }
a61af66fc99e Initial load duke parents: diff changeset	2660 }
a61af66fc99e Initial load duke parents: diff changeset	2661 }
a61af66fc99e Initial load duke parents: diff changeset	2662 for( uint i2 = 0; i2 < loop->_body.size(); i2++ ) {
a61af66fc99e Initial load duke parents: diff changeset	2663 Node *n = loop->_body.at(i2);
a61af66fc99e Initial load duke parents: diff changeset	2664 if (n->outcnt() == 0) continue; // Ignore dead
a61af66fc99e Initial load duke parents: diff changeset	2665 uint j;
a61af66fc99e Initial load duke parents: diff changeset	2666 for( j = 0; j < _body.size(); j++ )
a61af66fc99e Initial load duke parents: diff changeset	2667 if( _body.at(j) == n )
a61af66fc99e Initial load duke parents: diff changeset	2668 break;
a61af66fc99e Initial load duke parents: diff changeset	2669 if( j == _body.size() ) { // Not found in loop body
a61af66fc99e Initial load duke parents: diff changeset	2670 // Last ditch effort to avoid assertion: Its possible that we
a61af66fc99e Initial load duke parents: diff changeset	2671 // have some users (so outcnt not zero) but are still dead.
a61af66fc99e Initial load duke parents: diff changeset	2672 // Try to find from root.
a61af66fc99e Initial load duke parents: diff changeset	2673 if (Compile::current()->root()->find(n->_idx)) {
a61af66fc99e Initial load duke parents: diff changeset	2674 fail++;
a61af66fc99e Initial load duke parents: diff changeset	2675 tty->print("Verify has that we do not: ");
a61af66fc99e Initial load duke parents: diff changeset	2676 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	2677 }
a61af66fc99e Initial load duke parents: diff changeset	2678 }
a61af66fc99e Initial load duke parents: diff changeset	2679 }
a61af66fc99e Initial load duke parents: diff changeset	2680 assert( !fail, "loop body mismatch" );
a61af66fc99e Initial load duke parents: diff changeset	2681 }
a61af66fc99e Initial load duke parents: diff changeset	2682 }
a61af66fc99e Initial load duke parents: diff changeset	2683
a61af66fc99e Initial load duke parents: diff changeset	2684 #endif
a61af66fc99e Initial load duke parents: diff changeset	2685
a61af66fc99e Initial load duke parents: diff changeset	2686 //------------------------------set_idom---------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2687 void PhaseIdealLoop::set_idom(Node* d, Node* n, uint dom_depth) {
a61af66fc99e Initial load duke parents: diff changeset	2688 uint idx = d->_idx;
a61af66fc99e Initial load duke parents: diff changeset	2689 if (idx >= _idom_size) {
a61af66fc99e Initial load duke parents: diff changeset	2690 uint newsize = _idom_size<<1;
a61af66fc99e Initial load duke parents: diff changeset	2691 while( idx >= newsize ) {
a61af66fc99e Initial load duke parents: diff changeset	2692 newsize <<= 1;
a61af66fc99e Initial load duke parents: diff changeset	2693 }
a61af66fc99e Initial load duke parents: diff changeset	2694 _idom = REALLOC_RESOURCE_ARRAY( Node*, _idom,_idom_size,newsize);
a61af66fc99e Initial load duke parents: diff changeset	2695 _dom_depth = REALLOC_RESOURCE_ARRAY( uint, _dom_depth,_idom_size,newsize);
a61af66fc99e Initial load duke parents: diff changeset	2696 memset( _dom_depth + _idom_size, 0, (newsize - _idom_size) * sizeof(uint) );
a61af66fc99e Initial load duke parents: diff changeset	2697 _idom_size = newsize;
a61af66fc99e Initial load duke parents: diff changeset	2698 }
a61af66fc99e Initial load duke parents: diff changeset	2699 _idom[idx] = n;
a61af66fc99e Initial load duke parents: diff changeset	2700 _dom_depth[idx] = dom_depth;
a61af66fc99e Initial load duke parents: diff changeset	2701 }
a61af66fc99e Initial load duke parents: diff changeset	2702
a61af66fc99e Initial load duke parents: diff changeset	2703 //------------------------------recompute_dom_depth---------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2704 // The dominator tree is constructed with only parent pointers.
a61af66fc99e Initial load duke parents: diff changeset	2705 // This recomputes the depth in the tree by first tagging all
a61af66fc99e Initial load duke parents: diff changeset	2706 // nodes as "no depth yet" marker. The next pass then runs up
a61af66fc99e Initial load duke parents: diff changeset	2707 // the dom tree from each node marked "no depth yet", and computes
a61af66fc99e Initial load duke parents: diff changeset	2708 // the depth on the way back down.
a61af66fc99e Initial load duke parents: diff changeset	2709 void PhaseIdealLoop::recompute_dom_depth() {
a61af66fc99e Initial load duke parents: diff changeset	2710 uint no_depth_marker = C->unique();
a61af66fc99e Initial load duke parents: diff changeset	2711 uint i;
a61af66fc99e Initial load duke parents: diff changeset	2712 // Initialize depth to "no depth yet"
a61af66fc99e Initial load duke parents: diff changeset	2713 for (i = 0; i < _idom_size; i++) {
a61af66fc99e Initial load duke parents: diff changeset	2714 if (_dom_depth[i] > 0 && _idom[i] != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	2715 _dom_depth[i] = no_depth_marker;
a61af66fc99e Initial load duke parents: diff changeset	2716 }
a61af66fc99e Initial load duke parents: diff changeset	2717 }
a61af66fc99e Initial load duke parents: diff changeset	2718 if (_dom_stk == NULL) {
23421 c1091733abe6 8011858: Use Compile::live_nodes() instead of Compile::unique() in appropriate places zmajo parents: 22842 diff changeset	2719 uint init_size = C->live_nodes() / 100; // Guess that 1/100 is a reasonable initial size.
0 a61af66fc99e Initial load duke parents: diff changeset	2720 if (init_size < 10) init_size = 10;
2248 194c9fdee631 7017240: C2: native memory leak in nsk/regression/b4675027 on windows-x86 in comp mode with G1 kvn parents: 1972 diff changeset	2721 _dom_stk = new GrowableArray<uint>(init_size);
0 a61af66fc99e Initial load duke parents: diff changeset	2722 }
a61af66fc99e Initial load duke parents: diff changeset	2723 // Compute new depth for each node.
a61af66fc99e Initial load duke parents: diff changeset	2724 for (i = 0; i < _idom_size; i++) {
a61af66fc99e Initial load duke parents: diff changeset	2725 uint j = i;
a61af66fc99e Initial load duke parents: diff changeset	2726 // Run up the dom tree to find a node with a depth
a61af66fc99e Initial load duke parents: diff changeset	2727 while (_dom_depth[j] == no_depth_marker) {
a61af66fc99e Initial load duke parents: diff changeset	2728 _dom_stk->push(j);
a61af66fc99e Initial load duke parents: diff changeset	2729 j = _idom[j]->_idx;
a61af66fc99e Initial load duke parents: diff changeset	2730 }
a61af66fc99e Initial load duke parents: diff changeset	2731 // Compute the depth on the way back down this tree branch
a61af66fc99e Initial load duke parents: diff changeset	2732 uint dd = _dom_depth[j] + 1;
a61af66fc99e Initial load duke parents: diff changeset	2733 while (_dom_stk->length() > 0) {
a61af66fc99e Initial load duke parents: diff changeset	2734 uint j = _dom_stk->pop();
a61af66fc99e Initial load duke parents: diff changeset	2735 _dom_depth[j] = dd;
a61af66fc99e Initial load duke parents: diff changeset	2736 dd++;
a61af66fc99e Initial load duke parents: diff changeset	2737 }
a61af66fc99e Initial load duke parents: diff changeset	2738 }
a61af66fc99e Initial load duke parents: diff changeset	2739 }
a61af66fc99e Initial load duke parents: diff changeset	2740
a61af66fc99e Initial load duke parents: diff changeset	2741 //------------------------------sort-------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2742 // Insert 'loop' into the existing loop tree. 'innermost' is a leaf of the
a61af66fc99e Initial load duke parents: diff changeset	2743 // loop tree, not the root.
a61af66fc99e Initial load duke parents: diff changeset	2744 IdealLoopTree PhaseIdealLoop::sort( IdealLoopTree loop, IdealLoopTree *innermost ) {
a61af66fc99e Initial load duke parents: diff changeset	2745 if( !innermost ) return loop; // New innermost loop
a61af66fc99e Initial load duke parents: diff changeset	2746
a61af66fc99e Initial load duke parents: diff changeset	2747 int loop_preorder = get_preorder(loop->_head); // Cache pre-order number
a61af66fc99e Initial load duke parents: diff changeset	2748 assert( loop_preorder, "not yet post-walked loop" );
a61af66fc99e Initial load duke parents: diff changeset	2749 IdealLoopTree **pp = &innermost; // Pointer to previous next-pointer
a61af66fc99e Initial load duke parents: diff changeset	2750 IdealLoopTree l = pp; // Do I go before or after 'l'?
a61af66fc99e Initial load duke parents: diff changeset	2751
a61af66fc99e Initial load duke parents: diff changeset	2752 // Insert at start of list
a61af66fc99e Initial load duke parents: diff changeset	2753 while( l ) { // Insertion sort based on pre-order
a61af66fc99e Initial load duke parents: diff changeset	2754 if( l == loop ) return innermost; // Already on list!
a61af66fc99e Initial load duke parents: diff changeset	2755 int l_preorder = get_preorder(l->_head); // Cache pre-order number
a61af66fc99e Initial load duke parents: diff changeset	2756 assert( l_preorder, "not yet post-walked l" );
a61af66fc99e Initial load duke parents: diff changeset	2757 // Check header pre-order number to figure proper nesting
a61af66fc99e Initial load duke parents: diff changeset	2758 if( loop_preorder > l_preorder )
a61af66fc99e Initial load duke parents: diff changeset	2759 break; // End of insertion
a61af66fc99e Initial load duke parents: diff changeset	2760 // If headers tie (e.g., shared headers) check tail pre-order numbers.
a61af66fc99e Initial load duke parents: diff changeset	2761 // Since I split shared headers, you'd think this could not happen.
a61af66fc99e Initial load duke parents: diff changeset	2762 // BUT: I must first do the preorder numbering before I can discover I
a61af66fc99e Initial load duke parents: diff changeset	2763 // have shared headers, so the split headers all get the same preorder
a61af66fc99e Initial load duke parents: diff changeset	2764 // number as the RegionNode they split from.
a61af66fc99e Initial load duke parents: diff changeset	2765 if( loop_preorder == l_preorder &&
a61af66fc99e Initial load duke parents: diff changeset	2766 get_preorder(loop->_tail) < get_preorder(l->_tail) )
a61af66fc99e Initial load duke parents: diff changeset	2767 break; // Also check for shared headers (same pre#)
a61af66fc99e Initial load duke parents: diff changeset	2768 pp = &l->_parent; // Chain up list
a61af66fc99e Initial load duke parents: diff changeset	2769 l = *pp;
a61af66fc99e Initial load duke parents: diff changeset	2770 }
a61af66fc99e Initial load duke parents: diff changeset	2771 // Link into list
a61af66fc99e Initial load duke parents: diff changeset	2772 // Point predecessor to me
a61af66fc99e Initial load duke parents: diff changeset	2773 *pp = loop;
a61af66fc99e Initial load duke parents: diff changeset	2774 // Point me to successor
a61af66fc99e Initial load duke parents: diff changeset	2775 IdealLoopTree *p = loop->_parent;
a61af66fc99e Initial load duke parents: diff changeset	2776 loop->_parent = l; // Point me to successor
a61af66fc99e Initial load duke parents: diff changeset	2777 if( p ) sort( p, innermost ); // Insert my parents into list as well
a61af66fc99e Initial load duke parents: diff changeset	2778 return innermost;
a61af66fc99e Initial load duke parents: diff changeset	2779 }
a61af66fc99e Initial load duke parents: diff changeset	2780
a61af66fc99e Initial load duke parents: diff changeset	2781 //------------------------------build_loop_tree--------------------------------
a61af66fc99e Initial load duke parents: diff changeset	2782 // I use a modified Vick/Tarjan algorithm. I need pre- and a post- visit
a61af66fc99e Initial load duke parents: diff changeset	2783 // bits. The _nodes[] array is mapped by Node index and holds a NULL for
a61af66fc99e Initial load duke parents: diff changeset	2784 // not-yet-pre-walked, pre-order # for pre-but-not-post-walked and holds the
a61af66fc99e Initial load duke parents: diff changeset	2785 // tightest enclosing IdealLoopTree for post-walked.
a61af66fc99e Initial load duke parents: diff changeset	2786 //
a61af66fc99e Initial load duke parents: diff changeset	2787 // During my forward walk I do a short 1-layer lookahead to see if I can find
a61af66fc99e Initial load duke parents: diff changeset	2788 // a loop backedge with that doesn't have any work on the backedge. This
a61af66fc99e Initial load duke parents: diff changeset	2789 // helps me construct nested loops with shared headers better.
a61af66fc99e Initial load duke parents: diff changeset	2790 //
a61af66fc99e Initial load duke parents: diff changeset	2791 // Once I've done the forward recursion, I do the post-work. For each child
a61af66fc99e Initial load duke parents: diff changeset	2792 // I check to see if there is a backedge. Backedges define a loop! I
a61af66fc99e Initial load duke parents: diff changeset	2793 // insert an IdealLoopTree at the target of the backedge.
a61af66fc99e Initial load duke parents: diff changeset	2794 //
a61af66fc99e Initial load duke parents: diff changeset	2795 // During the post-work I also check to see if I have several children
a61af66fc99e Initial load duke parents: diff changeset	2796 // belonging to different loops. If so, then this Node is a decision point
a61af66fc99e Initial load duke parents: diff changeset	2797 // where control flow can choose to change loop nests. It is at this
a61af66fc99e Initial load duke parents: diff changeset	2798 // decision point where I can figure out how loops are nested. At this
a61af66fc99e Initial load duke parents: diff changeset	2799 // time I can properly order the different loop nests from my children.
a61af66fc99e Initial load duke parents: diff changeset	2800 // Note that there may not be any backedges at the decision point!
a61af66fc99e Initial load duke parents: diff changeset	2801 //
a61af66fc99e Initial load duke parents: diff changeset	2802 // Since the decision point can be far removed from the backedges, I can't
a61af66fc99e Initial load duke parents: diff changeset	2803 // order my loops at the time I discover them. Thus at the decision point
a61af66fc99e Initial load duke parents: diff changeset	2804 // I need to inspect loop header pre-order numbers to properly nest my
a61af66fc99e Initial load duke parents: diff changeset	2805 // loops. This means I need to sort my childrens' loops by pre-order.
a61af66fc99e Initial load duke parents: diff changeset	2806 // The sort is of size number-of-control-children, which generally limits
a61af66fc99e Initial load duke parents: diff changeset	2807 // it to size 2 (i.e., I just choose between my 2 target loops).
a61af66fc99e Initial load duke parents: diff changeset	2808 void PhaseIdealLoop::build_loop_tree() {
23421 c1091733abe6 8011858: Use Compile::live_nodes() instead of Compile::unique() in appropriate places zmajo parents: 22842 diff changeset	2809 // Allocate stack of size C->live_nodes()/2 to avoid frequent realloc
c1091733abe6 8011858: Use Compile::live_nodes() instead of Compile::unique() in appropriate places zmajo parents: 22842 diff changeset	2810 GrowableArray <Node *> bltstack(C->live_nodes() >> 1);
0 a61af66fc99e Initial load duke parents: diff changeset	2811 Node *n = C->root();
a61af66fc99e Initial load duke parents: diff changeset	2812 bltstack.push(n);
a61af66fc99e Initial load duke parents: diff changeset	2813 int pre_order = 1;
a61af66fc99e Initial load duke parents: diff changeset	2814 int stack_size;
a61af66fc99e Initial load duke parents: diff changeset	2815
a61af66fc99e Initial load duke parents: diff changeset	2816 while ( ( stack_size = bltstack.length() ) != 0 ) {
a61af66fc99e Initial load duke parents: diff changeset	2817 n = bltstack.top(); // Leave node on stack
a61af66fc99e Initial load duke parents: diff changeset	2818 if ( !is_visited(n) ) {
a61af66fc99e Initial load duke parents: diff changeset	2819 // ---- Pre-pass Work ----
a61af66fc99e Initial load duke parents: diff changeset	2820 // Pre-walked but not post-walked nodes need a pre_order number.
a61af66fc99e Initial load duke parents: diff changeset	2821
a61af66fc99e Initial load duke parents: diff changeset	2822 set_preorder_visited( n, pre_order ); // set as visited
a61af66fc99e Initial load duke parents: diff changeset	2823
a61af66fc99e Initial load duke parents: diff changeset	2824 // ---- Scan over children ----
a61af66fc99e Initial load duke parents: diff changeset	2825 // Scan first over control projections that lead to loop headers.
a61af66fc99e Initial load duke parents: diff changeset	2826 // This helps us find inner-to-outer loops with shared headers better.
a61af66fc99e Initial load duke parents: diff changeset	2827
a61af66fc99e Initial load duke parents: diff changeset	2828 // Scan children's children for loop headers.
a61af66fc99e Initial load duke parents: diff changeset	2829 for ( int i = n->outcnt() - 1; i >= 0; --i ) {
a61af66fc99e Initial load duke parents: diff changeset	2830 Node* m = n->raw_out(i); // Child
a61af66fc99e Initial load duke parents: diff changeset	2831 if( m->is_CFG() && !is_visited(m) ) { // Only for CFG children
a61af66fc99e Initial load duke parents: diff changeset	2832 // Scan over children's children to find loop
a61af66fc99e Initial load duke parents: diff changeset	2833 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) {
a61af66fc99e Initial load duke parents: diff changeset	2834 Node* l = m->fast_out(j);
a61af66fc99e Initial load duke parents: diff changeset	2835 if( is_visited(l) && // Been visited?
a61af66fc99e Initial load duke parents: diff changeset	2836 !is_postvisited(l) && // But not post-visited
a61af66fc99e Initial load duke parents: diff changeset	2837 get_preorder(l) < pre_order ) { // And smaller pre-order
a61af66fc99e Initial load duke parents: diff changeset	2838 // Found! Scan the DFS down this path before doing other paths
a61af66fc99e Initial load duke parents: diff changeset	2839 bltstack.push(m);
a61af66fc99e Initial load duke parents: diff changeset	2840 break;
a61af66fc99e Initial load duke parents: diff changeset	2841 }
a61af66fc99e Initial load duke parents: diff changeset	2842 }
a61af66fc99e Initial load duke parents: diff changeset	2843 }
a61af66fc99e Initial load duke parents: diff changeset	2844 }
a61af66fc99e Initial load duke parents: diff changeset	2845 pre_order++;
a61af66fc99e Initial load duke parents: diff changeset	2846 }
a61af66fc99e Initial load duke parents: diff changeset	2847 else if ( !is_postvisited(n) ) {
a61af66fc99e Initial load duke parents: diff changeset	2848 // Note: build_loop_tree_impl() adds out edges on rare occasions,
a61af66fc99e Initial load duke parents: diff changeset	2849 // such as com.sun.rsasign.am::a.
a61af66fc99e Initial load duke parents: diff changeset	2850 // For non-recursive version, first, process current children.
a61af66fc99e Initial load duke parents: diff changeset	2851 // On next iteration, check if additional children were added.
a61af66fc99e Initial load duke parents: diff changeset	2852 for ( int k = n->outcnt() - 1; k >= 0; --k ) {
a61af66fc99e Initial load duke parents: diff changeset	2853 Node* u = n->raw_out(k);
a61af66fc99e Initial load duke parents: diff changeset	2854 if ( u->is_CFG() && !is_visited(u) ) {
a61af66fc99e Initial load duke parents: diff changeset	2855 bltstack.push(u);
a61af66fc99e Initial load duke parents: diff changeset	2856 }
a61af66fc99e Initial load duke parents: diff changeset	2857 }
a61af66fc99e Initial load duke parents: diff changeset	2858 if ( bltstack.length() == stack_size ) {
a61af66fc99e Initial load duke parents: diff changeset	2859 // There were no additional children, post visit node now
a61af66fc99e Initial load duke parents: diff changeset	2860 (void)bltstack.pop(); // Remove node from stack
a61af66fc99e Initial load duke parents: diff changeset	2861 pre_order = build_loop_tree_impl( n, pre_order );
a61af66fc99e Initial load duke parents: diff changeset	2862 // Check for bailout
a61af66fc99e Initial load duke parents: diff changeset	2863 if (C->failing()) {
a61af66fc99e Initial load duke parents: diff changeset	2864 return;
a61af66fc99e Initial load duke parents: diff changeset	2865 }
a61af66fc99e Initial load duke parents: diff changeset	2866 // Check to grow _preorders[] array for the case when
a61af66fc99e Initial load duke parents: diff changeset	2867 // build_loop_tree_impl() adds new nodes.
a61af66fc99e Initial load duke parents: diff changeset	2868 check_grow_preorders();
a61af66fc99e Initial load duke parents: diff changeset	2869 }
a61af66fc99e Initial load duke parents: diff changeset	2870 }
a61af66fc99e Initial load duke parents: diff changeset	2871 else {
a61af66fc99e Initial load duke parents: diff changeset	2872 (void)bltstack.pop(); // Remove post-visited node from stack
a61af66fc99e Initial load duke parents: diff changeset	2873 }
a61af66fc99e Initial load duke parents: diff changeset	2874 }
a61af66fc99e Initial load duke parents: diff changeset	2875 }
a61af66fc99e Initial load duke parents: diff changeset	2876
a61af66fc99e Initial load duke parents: diff changeset	2877 //------------------------------build_loop_tree_impl---------------------------
a61af66fc99e Initial load duke parents: diff changeset	2878 int PhaseIdealLoop::build_loop_tree_impl( Node *n, int pre_order ) {
a61af66fc99e Initial load duke parents: diff changeset	2879 // ---- Post-pass Work ----
a61af66fc99e Initial load duke parents: diff changeset	2880 // Pre-walked but not post-walked nodes need a pre_order number.
a61af66fc99e Initial load duke parents: diff changeset	2881
a61af66fc99e Initial load duke parents: diff changeset	2882 // Tightest enclosing loop for this Node
a61af66fc99e Initial load duke parents: diff changeset	2883 IdealLoopTree *innermost = NULL;
a61af66fc99e Initial load duke parents: diff changeset	2884
a61af66fc99e Initial load duke parents: diff changeset	2885 // For all children, see if any edge is a backedge. If so, make a loop
a61af66fc99e Initial load duke parents: diff changeset	2886 // for it. Then find the tightest enclosing loop for the self Node.
a61af66fc99e Initial load duke parents: diff changeset	2887 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
a61af66fc99e Initial load duke parents: diff changeset	2888 Node* m = n->fast_out(i); // Child
a61af66fc99e Initial load duke parents: diff changeset	2889 if( n == m ) continue; // Ignore control self-cycles
a61af66fc99e Initial load duke parents: diff changeset	2890 if( !m->is_CFG() ) continue;// Ignore non-CFG edges
a61af66fc99e Initial load duke parents: diff changeset	2891
a61af66fc99e Initial load duke parents: diff changeset	2892 IdealLoopTree *l; // Child's loop
a61af66fc99e Initial load duke parents: diff changeset	2893 if( !is_postvisited(m) ) { // Child visited but not post-visited?
a61af66fc99e Initial load duke parents: diff changeset	2894 // Found a backedge
a61af66fc99e Initial load duke parents: diff changeset	2895 assert( get_preorder(m) < pre_order, "should be backedge" );
a61af66fc99e Initial load duke parents: diff changeset	2896 // Check for the RootNode, which is already a LoopNode and is allowed
a61af66fc99e Initial load duke parents: diff changeset	2897 // to have multiple "backedges".
a61af66fc99e Initial load duke parents: diff changeset	2898 if( m == C->root()) { // Found the root?
a61af66fc99e Initial load duke parents: diff changeset	2899 l = _ltree_root; // Root is the outermost LoopNode
a61af66fc99e Initial load duke parents: diff changeset	2900 } else { // Else found a nested loop
a61af66fc99e Initial load duke parents: diff changeset	2901 // Insert a LoopNode to mark this loop.
a61af66fc99e Initial load duke parents: diff changeset	2902 l = new IdealLoopTree(this, m, n);
a61af66fc99e Initial load duke parents: diff changeset	2903 } // End of Else found a nested loop
a61af66fc99e Initial load duke parents: diff changeset	2904 if( !has_loop(m) ) // If 'm' does not already have a loop set
a61af66fc99e Initial load duke parents: diff changeset	2905 set_loop(m, l); // Set loop header to loop now
a61af66fc99e Initial load duke parents: diff changeset	2906
a61af66fc99e Initial load duke parents: diff changeset	2907 } else { // Else not a nested loop
a61af66fc99e Initial load duke parents: diff changeset	2908 if( !_nodes[m->_idx] ) continue; // Dead code has no loop
a61af66fc99e Initial load duke parents: diff changeset	2909 l = get_loop(m); // Get previously determined loop
a61af66fc99e Initial load duke parents: diff changeset	2910 // If successor is header of a loop (nest), move up-loop till it
a61af66fc99e Initial load duke parents: diff changeset	2911 // is a member of some outer enclosing loop. Since there are no
a61af66fc99e Initial load duke parents: diff changeset	2912 // shared headers (I've split them already) I only need to go up
a61af66fc99e Initial load duke parents: diff changeset	2913 // at most 1 level.
a61af66fc99e Initial load duke parents: diff changeset	2914 while( l && l->_head == m ) // Successor heads loop?
a61af66fc99e Initial load duke parents: diff changeset	2915 l = l->_parent; // Move up 1 for me
a61af66fc99e Initial load duke parents: diff changeset	2916 // If this loop is not properly parented, then this loop
a61af66fc99e Initial load duke parents: diff changeset	2917 // has no exit path out, i.e. its an infinite loop.
a61af66fc99e Initial load duke parents: diff changeset	2918 if( !l ) {
a61af66fc99e Initial load duke parents: diff changeset	2919 // Make loop "reachable" from root so the CFG is reachable. Basically
a61af66fc99e Initial load duke parents: diff changeset	2920 // insert a bogus loop exit that is never taken. 'm', the loop head,
a61af66fc99e Initial load duke parents: diff changeset	2921 // points to 'n', one (of possibly many) fall-in paths. There may be
a61af66fc99e Initial load duke parents: diff changeset	2922 // many backedges as well.
a61af66fc99e Initial load duke parents: diff changeset	2923
a61af66fc99e Initial load duke parents: diff changeset	2924 // Here I set the loop to be the root loop. I could have, after
a61af66fc99e Initial load duke parents: diff changeset	2925 // inserting a bogus loop exit, restarted the recursion and found my
a61af66fc99e Initial load duke parents: diff changeset	2926 // new loop exit. This would make the infinite loop a first-class
a61af66fc99e Initial load duke parents: diff changeset	2927 // loop and it would then get properly optimized. What's the use of
a61af66fc99e Initial load duke parents: diff changeset	2928 // optimizing an infinite loop?
a61af66fc99e Initial load duke parents: diff changeset	2929 l = _ltree_root; // Oops, found infinite loop
a61af66fc99e Initial load duke parents: diff changeset	2930
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2931 if (!_verify_only) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2932 // Insert the NeverBranch between 'm' and it's control user.
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	2933 NeverBranchNode *iff = new (C) NeverBranchNode( m );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2934 _igvn.register_new_node_with_optimizer(iff);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2935 set_loop(iff, l);
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	2936 Node *if_t = new (C) CProjNode( iff, 0 );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2937 _igvn.register_new_node_with_optimizer(if_t);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2938 set_loop(if_t, l);
0 a61af66fc99e Initial load duke parents: diff changeset	2939
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2940 Node* cfg = NULL; // Find the One True Control User of m
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2941 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2942 Node* x = m->fast_out(j);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2943 if (x->is_CFG() && x != m && x != iff)
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2944 { cfg = x; break; }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2945 }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2946 assert(cfg != NULL, "must find the control user of m");
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2947 uint k = 0; // Probably cfg->in(0)
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2948 while( cfg->in(k) != m ) k++; // But check incase cfg is a Region
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2949 cfg->set_req( k, if_t ); // Now point to NeverBranch
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2950
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2951 // Now create the never-taken loop exit
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	2952 Node *if_f = new (C) CProjNode( iff, 1 );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2953 _igvn.register_new_node_with_optimizer(if_f);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2954 set_loop(if_f, l);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2955 // Find frame ptr for Halt. Relies on the optimizer
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2956 // V-N'ing. Easier and quicker than searching through
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2957 // the program structure.
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	2958 Node *frame = new (C) ParmNode( C->start(), TypeFunc::FramePtr );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2959 _igvn.register_new_node_with_optimizer(frame);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2960 // Halt & Catch Fire
6804 e626685e9f6c 7193318: C2: remove number of inputs requirement from Node's new operator kvn parents: 6636 diff changeset	2961 Node *halt = new (C) HaltNode( if_f, frame );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2962 _igvn.register_new_node_with_optimizer(halt);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2963 set_loop(halt, l);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2964 C->root()->add_req(halt);
0 a61af66fc99e Initial load duke parents: diff changeset	2965 }
a61af66fc99e Initial load duke parents: diff changeset	2966 set_loop(C->root(), _ltree_root);
a61af66fc99e Initial load duke parents: diff changeset	2967 }
a61af66fc99e Initial load duke parents: diff changeset	2968 }
a61af66fc99e Initial load duke parents: diff changeset	2969 // Weeny check for irreducible. This child was already visited (this
a61af66fc99e Initial load duke parents: diff changeset	2970 // IS the post-work phase). Is this child's loop header post-visited
a61af66fc99e Initial load duke parents: diff changeset	2971 // as well? If so, then I found another entry into the loop.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2972 if (!_verify_only) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2973 while( is_postvisited(l->_head) ) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2974 // found irreducible
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2975 l->_irreducible = 1; // = true
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2976 l = l->_parent;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2977 _has_irreducible_loops = true;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2978 // Check for bad CFG here to prevent crash, and bailout of compile
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2979 if (l == NULL) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2980 C->record_method_not_compilable("unhandled CFG detected during loop optimization");
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2981 return pre_order;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	2982 }
0 a61af66fc99e Initial load duke parents: diff changeset	2983 }
17914 3636afd5ec1a 8039298: assert(base == NULL \|\| t_adr->isa_rawptr() \|\| !phase->type(base)->higher_equal(TypePtr::NULL_PTR)) kvn parents: 17887 diff changeset	2984 C->set_has_irreducible_loop(_has_irreducible_loops);
0 a61af66fc99e Initial load duke parents: diff changeset	2985 }
a61af66fc99e Initial load duke parents: diff changeset	2986
a61af66fc99e Initial load duke parents: diff changeset	2987 // This Node might be a decision point for loops. It is only if
a61af66fc99e Initial load duke parents: diff changeset	2988 // it's children belong to several different loops. The sort call
a61af66fc99e Initial load duke parents: diff changeset	2989 // does a trivial amount of work if there is only 1 child or all
a61af66fc99e Initial load duke parents: diff changeset	2990 // children belong to the same loop. If however, the children
a61af66fc99e Initial load duke parents: diff changeset	2991 // belong to different loops, the sort call will properly set the
a61af66fc99e Initial load duke parents: diff changeset	2992 // _parent pointers to show how the loops nest.
a61af66fc99e Initial load duke parents: diff changeset	2993 //
a61af66fc99e Initial load duke parents: diff changeset	2994 // In any case, it returns the tightest enclosing loop.
a61af66fc99e Initial load duke parents: diff changeset	2995 innermost = sort( l, innermost );
a61af66fc99e Initial load duke parents: diff changeset	2996 }
a61af66fc99e Initial load duke parents: diff changeset	2997
a61af66fc99e Initial load duke parents: diff changeset	2998 // Def-use info will have some dead stuff; dead stuff will have no
a61af66fc99e Initial load duke parents: diff changeset	2999 // loop decided on.
a61af66fc99e Initial load duke parents: diff changeset	3000
a61af66fc99e Initial load duke parents: diff changeset	3001 // Am I a loop header? If so fix up my parent's child and next ptrs.
a61af66fc99e Initial load duke parents: diff changeset	3002 if( innermost && innermost->_head == n ) {
a61af66fc99e Initial load duke parents: diff changeset	3003 assert( get_loop(n) == innermost, "" );
a61af66fc99e Initial load duke parents: diff changeset	3004 IdealLoopTree *p = innermost->_parent;
a61af66fc99e Initial load duke parents: diff changeset	3005 IdealLoopTree *l = innermost;
a61af66fc99e Initial load duke parents: diff changeset	3006 while( p && l->_head == n ) {
a61af66fc99e Initial load duke parents: diff changeset	3007 l->_next = p->_child; // Put self on parents 'next child'
a61af66fc99e Initial load duke parents: diff changeset	3008 p->_child = l; // Make self as first child of parent
a61af66fc99e Initial load duke parents: diff changeset	3009 l = p; // Now walk up the parent chain
a61af66fc99e Initial load duke parents: diff changeset	3010 p = l->_parent;
a61af66fc99e Initial load duke parents: diff changeset	3011 }
a61af66fc99e Initial load duke parents: diff changeset	3012 } else {
a61af66fc99e Initial load duke parents: diff changeset	3013 // Note that it is possible for a LoopNode to reach here, if the
a61af66fc99e Initial load duke parents: diff changeset	3014 // backedge has been made unreachable (hence the LoopNode no longer
a61af66fc99e Initial load duke parents: diff changeset	3015 // denotes a Loop, and will eventually be removed).
a61af66fc99e Initial load duke parents: diff changeset	3016
a61af66fc99e Initial load duke parents: diff changeset	3017 // Record tightest enclosing loop for self. Mark as post-visited.
a61af66fc99e Initial load duke parents: diff changeset	3018 set_loop(n, innermost);
a61af66fc99e Initial load duke parents: diff changeset	3019 // Also record has_call flag early on
a61af66fc99e Initial load duke parents: diff changeset	3020 if( innermost ) {
a61af66fc99e Initial load duke parents: diff changeset	3021 if( n->is_Call() && !n->is_CallLeaf() && !n->is_macro() ) {
a61af66fc99e Initial load duke parents: diff changeset	3022 // Do not count uncommon calls
a61af66fc99e Initial load duke parents: diff changeset	3023 if( !n->is_CallStaticJava() \|\| !n->as_CallStaticJava()->_name ) {
a61af66fc99e Initial load duke parents: diff changeset	3024 Node *iff = n->in(0)->in(0);
6179 8c92982cbbc4 7119644: Increase superword's vector size up to 256 bits kvn parents: 6144 diff changeset	3025 // No any calls for vectorized loops.
8c92982cbbc4 7119644: Increase superword's vector size up to 256 bits kvn parents: 6144 diff changeset	3026 if( UseSuperWord \|\| !iff->is_If() \|\|
0 a61af66fc99e Initial load duke parents: diff changeset	3027 (n->in(0)->Opcode() == Op_IfFalse &&
a61af66fc99e Initial load duke parents: diff changeset	3028 (1.0 - iff->as_If()->_prob) >= 0.01) \|\|
a61af66fc99e Initial load duke parents: diff changeset	3029 (iff->as_If()->_prob >= 0.01) )
a61af66fc99e Initial load duke parents: diff changeset	3030 innermost->_has_call = 1;
a61af66fc99e Initial load duke parents: diff changeset	3031 }
39 76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3032 } else if( n->is_Allocate() && n->as_Allocate()->_is_scalar_replaceable ) {
76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3033 // Disable loop optimizations if the loop has a scalar replaceable
76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3034 // allocation. This disabling may cause a potential performance lost
76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3035 // if the allocation is not eliminated for some reason.
76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3036 innermost->_allow_optimizations = false;
76256d272075 6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation kvn parents: 17 diff changeset	3037 innermost->_has_call = 1; // = true
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3038 } else if (n->Opcode() == Op_SafePoint) {
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3039 // Record all safepoints in this loop.
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3040 if (innermost->_safepts == NULL) innermost->_safepts = new Node_List();
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3041 innermost->_safepts->push(n);
0 a61af66fc99e Initial load duke parents: diff changeset	3042 }
a61af66fc99e Initial load duke parents: diff changeset	3043 }
a61af66fc99e Initial load duke parents: diff changeset	3044 }
a61af66fc99e Initial load duke parents: diff changeset	3045
a61af66fc99e Initial load duke parents: diff changeset	3046 // Flag as post-visited now
a61af66fc99e Initial load duke parents: diff changeset	3047 set_postvisited(n);
a61af66fc99e Initial load duke parents: diff changeset	3048 return pre_order;
a61af66fc99e Initial load duke parents: diff changeset	3049 }
a61af66fc99e Initial load duke parents: diff changeset	3050
a61af66fc99e Initial load duke parents: diff changeset	3051
a61af66fc99e Initial load duke parents: diff changeset	3052 //------------------------------build_loop_early-------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3053 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping.
a61af66fc99e Initial load duke parents: diff changeset	3054 // First pass computes the earliest controlling node possible. This is the
a61af66fc99e Initial load duke parents: diff changeset	3055 // controlling input with the deepest dominating depth.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3056 void PhaseIdealLoop::build_loop_early( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) {
0 a61af66fc99e Initial load duke parents: diff changeset	3057 while (worklist.size() != 0) {
a61af66fc99e Initial load duke parents: diff changeset	3058 // Use local variables nstack_top_n & nstack_top_i to cache values
a61af66fc99e Initial load duke parents: diff changeset	3059 // on nstack's top.
a61af66fc99e Initial load duke parents: diff changeset	3060 Node *nstack_top_n = worklist.pop();
a61af66fc99e Initial load duke parents: diff changeset	3061 uint nstack_top_i = 0;
a61af66fc99e Initial load duke parents: diff changeset	3062 //while_nstack_nonempty:
a61af66fc99e Initial load duke parents: diff changeset	3063 while (true) {
a61af66fc99e Initial load duke parents: diff changeset	3064 // Get parent node and next input's index from stack's top.
a61af66fc99e Initial load duke parents: diff changeset	3065 Node *n = nstack_top_n;
a61af66fc99e Initial load duke parents: diff changeset	3066 uint i = nstack_top_i;
a61af66fc99e Initial load duke parents: diff changeset	3067 uint cnt = n->req(); // Count of inputs
a61af66fc99e Initial load duke parents: diff changeset	3068 if (i == 0) { // Pre-process the node.
a61af66fc99e Initial load duke parents: diff changeset	3069 if( has_node(n) && // Have either loop or control already?
a61af66fc99e Initial load duke parents: diff changeset	3070 !has_ctrl(n) ) { // Have loop picked out already?
a61af66fc99e Initial load duke parents: diff changeset	3071 // During "merge_many_backedges" we fold up several nested loops
a61af66fc99e Initial load duke parents: diff changeset	3072 // into a single loop. This makes the members of the original
a61af66fc99e Initial load duke parents: diff changeset	3073 // loop bodies pointing to dead loops; they need to move up
a61af66fc99e Initial load duke parents: diff changeset	3074 // to the new UNION'd larger loop. I set the _head field of these
a61af66fc99e Initial load duke parents: diff changeset	3075 // dead loops to NULL and the _parent field points to the owning
a61af66fc99e Initial load duke parents: diff changeset	3076 // loop. Shades of UNION-FIND algorithm.
a61af66fc99e Initial load duke parents: diff changeset	3077 IdealLoopTree *ilt;
a61af66fc99e Initial load duke parents: diff changeset	3078 while( !(ilt = get_loop(n))->_head ) {
a61af66fc99e Initial load duke parents: diff changeset	3079 // Normally I would use a set_loop here. But in this one special
a61af66fc99e Initial load duke parents: diff changeset	3080 // case, it is legal (and expected) to change what loop a Node
a61af66fc99e Initial load duke parents: diff changeset	3081 // belongs to.
a61af66fc99e Initial load duke parents: diff changeset	3082 _nodes.map(n->_idx, (Node*)(ilt->_parent) );
a61af66fc99e Initial load duke parents: diff changeset	3083 }
a61af66fc99e Initial load duke parents: diff changeset	3084 // Remove safepoints ONLY if I've already seen I don't need one.
a61af66fc99e Initial load duke parents: diff changeset	3085 // (the old code here would yank a 2nd safepoint after seeing a
a61af66fc99e Initial load duke parents: diff changeset	3086 // first one, even though the 1st did not dominate in the loop body
a61af66fc99e Initial load duke parents: diff changeset	3087 // and thus could be avoided indefinitely)
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3088 if( !_verify_only && !_verify_me && ilt->_has_sfpt && n->Opcode() == Op_SafePoint &&
0 a61af66fc99e Initial load duke parents: diff changeset	3089 is_deleteable_safept(n)) {
a61af66fc99e Initial load duke parents: diff changeset	3090 Node *in = n->in(TypeFunc::Control);
a61af66fc99e Initial load duke parents: diff changeset	3091 lazy_replace(n,in); // Pull safepoint now
6636 0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3092 if (ilt->_safepts != NULL) {
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3093 ilt->_safepts->yank(n);
0acd345fd810 7160161: Missed safepoint in non-Counted loop kvn parents: 6614 diff changeset	3094 }
0 a61af66fc99e Initial load duke parents: diff changeset	3095 // Carry on with the recursion "as if" we are walking
a61af66fc99e Initial load duke parents: diff changeset	3096 // only the control input
a61af66fc99e Initial load duke parents: diff changeset	3097 if( !visited.test_set( in->_idx ) ) {
a61af66fc99e Initial load duke parents: diff changeset	3098 worklist.push(in); // Visit this guy later, using worklist
a61af66fc99e Initial load duke parents: diff changeset	3099 }
a61af66fc99e Initial load duke parents: diff changeset	3100 // Get next node from nstack:
a61af66fc99e Initial load duke parents: diff changeset	3101 // - skip n's inputs processing by setting i > cnt;
a61af66fc99e Initial load duke parents: diff changeset	3102 // - we also will not call set_early_ctrl(n) since
a61af66fc99e Initial load duke parents: diff changeset	3103 // has_node(n) == true (see the condition above).
a61af66fc99e Initial load duke parents: diff changeset	3104 i = cnt + 1;
a61af66fc99e Initial load duke parents: diff changeset	3105 }
a61af66fc99e Initial load duke parents: diff changeset	3106 }
a61af66fc99e Initial load duke parents: diff changeset	3107 } // if (i == 0)
a61af66fc99e Initial load duke parents: diff changeset	3108
a61af66fc99e Initial load duke parents: diff changeset	3109 // Visit all inputs
a61af66fc99e Initial load duke parents: diff changeset	3110 bool done = true; // Assume all n's inputs will be processed
a61af66fc99e Initial load duke parents: diff changeset	3111 while (i < cnt) {
a61af66fc99e Initial load duke parents: diff changeset	3112 Node *in = n->in(i);
a61af66fc99e Initial load duke parents: diff changeset	3113 ++i;
a61af66fc99e Initial load duke parents: diff changeset	3114 if (in == NULL) continue;
a61af66fc99e Initial load duke parents: diff changeset	3115 if (in->pinned() && !in->is_CFG())
a61af66fc99e Initial load duke parents: diff changeset	3116 set_ctrl(in, in->in(0));
a61af66fc99e Initial load duke parents: diff changeset	3117 int is_visited = visited.test_set( in->_idx );
a61af66fc99e Initial load duke parents: diff changeset	3118 if (!has_node(in)) { // No controlling input yet?
a61af66fc99e Initial load duke parents: diff changeset	3119 assert( !in->is_CFG(), "CFG Node with no controlling input?" );
a61af66fc99e Initial load duke parents: diff changeset	3120 assert( !is_visited, "visit only once" );
a61af66fc99e Initial load duke parents: diff changeset	3121 nstack.push(n, i); // Save parent node and next input's index.
a61af66fc99e Initial load duke parents: diff changeset	3122 nstack_top_n = in; // Process current input now.
a61af66fc99e Initial load duke parents: diff changeset	3123 nstack_top_i = 0;
a61af66fc99e Initial load duke parents: diff changeset	3124 done = false; // Not all n's inputs processed.
a61af66fc99e Initial load duke parents: diff changeset	3125 break; // continue while_nstack_nonempty;
a61af66fc99e Initial load duke parents: diff changeset	3126 } else if (!is_visited) {
a61af66fc99e Initial load duke parents: diff changeset	3127 // This guy has a location picked out for him, but has not yet
a61af66fc99e Initial load duke parents: diff changeset	3128 // been visited. Happens to all CFG nodes, for instance.
a61af66fc99e Initial load duke parents: diff changeset	3129 // Visit him using the worklist instead of recursion, to break
a61af66fc99e Initial load duke parents: diff changeset	3130 // cycles. Since he has a location already we do not need to
a61af66fc99e Initial load duke parents: diff changeset	3131 // find his location before proceeding with the current Node.
a61af66fc99e Initial load duke parents: diff changeset	3132 worklist.push(in); // Visit this guy later, using worklist
a61af66fc99e Initial load duke parents: diff changeset	3133 }
a61af66fc99e Initial load duke parents: diff changeset	3134 }
a61af66fc99e Initial load duke parents: diff changeset	3135 if (done) {
a61af66fc99e Initial load duke parents: diff changeset	3136 // All of n's inputs have been processed, complete post-processing.
a61af66fc99e Initial load duke parents: diff changeset	3137
605 98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3138 // Compute earliest point this Node can go.
0 a61af66fc99e Initial load duke parents: diff changeset	3139 // CFG, Phi, pinned nodes already know their controlling input.
a61af66fc99e Initial load duke parents: diff changeset	3140 if (!has_node(n)) {
a61af66fc99e Initial load duke parents: diff changeset	3141 // Record earliest legal location
a61af66fc99e Initial load duke parents: diff changeset	3142 set_early_ctrl( n );
a61af66fc99e Initial load duke parents: diff changeset	3143 }
a61af66fc99e Initial load duke parents: diff changeset	3144 if (nstack.is_empty()) {
a61af66fc99e Initial load duke parents: diff changeset	3145 // Finished all nodes on stack.
a61af66fc99e Initial load duke parents: diff changeset	3146 // Process next node on the worklist.
a61af66fc99e Initial load duke parents: diff changeset	3147 break;
a61af66fc99e Initial load duke parents: diff changeset	3148 }
a61af66fc99e Initial load duke parents: diff changeset	3149 // Get saved parent node and next input's index.
a61af66fc99e Initial load duke parents: diff changeset	3150 nstack_top_n = nstack.node();
a61af66fc99e Initial load duke parents: diff changeset	3151 nstack_top_i = nstack.index();
a61af66fc99e Initial load duke parents: diff changeset	3152 nstack.pop();
a61af66fc99e Initial load duke parents: diff changeset	3153 }
a61af66fc99e Initial load duke parents: diff changeset	3154 } // while (true)
a61af66fc99e Initial load duke parents: diff changeset	3155 }
a61af66fc99e Initial load duke parents: diff changeset	3156 }
a61af66fc99e Initial load duke parents: diff changeset	3157
a61af66fc99e Initial load duke parents: diff changeset	3158 //------------------------------dom_lca_internal--------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3159 // Pair-wise LCA
a61af66fc99e Initial load duke parents: diff changeset	3160 Node PhaseIdealLoop::dom_lca_internal( Node n1, Node *n2 ) const {
a61af66fc99e Initial load duke parents: diff changeset	3161 if( !n1 ) return n2; // Handle NULL original LCA
a61af66fc99e Initial load duke parents: diff changeset	3162 assert( n1->is_CFG(), "" );
a61af66fc99e Initial load duke parents: diff changeset	3163 assert( n2->is_CFG(), "" );
a61af66fc99e Initial load duke parents: diff changeset	3164 // find LCA of all uses
a61af66fc99e Initial load duke parents: diff changeset	3165 uint d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3166 uint d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3167 while (n1 != n2) {
a61af66fc99e Initial load duke parents: diff changeset	3168 if (d1 > d2) {
a61af66fc99e Initial load duke parents: diff changeset	3169 n1 = idom(n1);
a61af66fc99e Initial load duke parents: diff changeset	3170 d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3171 } else if (d1 < d2) {
a61af66fc99e Initial load duke parents: diff changeset	3172 n2 = idom(n2);
a61af66fc99e Initial load duke parents: diff changeset	3173 d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3174 } else {
a61af66fc99e Initial load duke parents: diff changeset	3175 // Here d1 == d2. Due to edits of the dominator-tree, sections
a61af66fc99e Initial load duke parents: diff changeset	3176 // of the tree might have the same depth. These sections have
a61af66fc99e Initial load duke parents: diff changeset	3177 // to be searched more carefully.
a61af66fc99e Initial load duke parents: diff changeset	3178
a61af66fc99e Initial load duke parents: diff changeset	3179 // Scan up all the n1's with equal depth, looking for n2.
a61af66fc99e Initial load duke parents: diff changeset	3180 Node *t1 = idom(n1);
a61af66fc99e Initial load duke parents: diff changeset	3181 while (dom_depth(t1) == d1) {
a61af66fc99e Initial load duke parents: diff changeset	3182 if (t1 == n2) return n2;
a61af66fc99e Initial load duke parents: diff changeset	3183 t1 = idom(t1);
a61af66fc99e Initial load duke parents: diff changeset	3184 }
a61af66fc99e Initial load duke parents: diff changeset	3185 // Scan up all the n2's with equal depth, looking for n1.
a61af66fc99e Initial load duke parents: diff changeset	3186 Node *t2 = idom(n2);
a61af66fc99e Initial load duke parents: diff changeset	3187 while (dom_depth(t2) == d2) {
a61af66fc99e Initial load duke parents: diff changeset	3188 if (t2 == n1) return n1;
a61af66fc99e Initial load duke parents: diff changeset	3189 t2 = idom(t2);
a61af66fc99e Initial load duke parents: diff changeset	3190 }
a61af66fc99e Initial load duke parents: diff changeset	3191 // Move up to a new dominator-depth value as well as up the dom-tree.
a61af66fc99e Initial load duke parents: diff changeset	3192 n1 = t1;
a61af66fc99e Initial load duke parents: diff changeset	3193 n2 = t2;
a61af66fc99e Initial load duke parents: diff changeset	3194 d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3195 d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3196 }
a61af66fc99e Initial load duke parents: diff changeset	3197 }
a61af66fc99e Initial load duke parents: diff changeset	3198 return n1;
a61af66fc99e Initial load duke parents: diff changeset	3199 }
a61af66fc99e Initial load duke parents: diff changeset	3200
a61af66fc99e Initial load duke parents: diff changeset	3201 //------------------------------compute_idom-----------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3202 // Locally compute IDOM using dom_lca call. Correct only if the incoming
a61af66fc99e Initial load duke parents: diff changeset	3203 // IDOMs are correct.
a61af66fc99e Initial load duke parents: diff changeset	3204 Node PhaseIdealLoop::compute_idom( Node region ) const {
a61af66fc99e Initial load duke parents: diff changeset	3205 assert( region->is_Region(), "" );
a61af66fc99e Initial load duke parents: diff changeset	3206 Node *LCA = NULL;
a61af66fc99e Initial load duke parents: diff changeset	3207 for( uint i = 1; i < region->req(); i++ ) {
a61af66fc99e Initial load duke parents: diff changeset	3208 if( region->in(i) != C->top() )
a61af66fc99e Initial load duke parents: diff changeset	3209 LCA = dom_lca( LCA, region->in(i) );
a61af66fc99e Initial load duke parents: diff changeset	3210 }
a61af66fc99e Initial load duke parents: diff changeset	3211 return LCA;
a61af66fc99e Initial load duke parents: diff changeset	3212 }
a61af66fc99e Initial load duke parents: diff changeset	3213
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3214 bool PhaseIdealLoop::verify_dominance(Node* n, Node* use, Node* LCA, Node* early) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3215 bool had_error = false;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3216 #ifdef ASSERT
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3217 if (early != C->root()) {
17887 cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3218 // Make sure that there's a dominance path from LCA to early
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3219 Node* d = LCA;
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3220 while (d != early) {
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3221 if (d == C->root()) {
17887 cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3222 dump_bad_graph("Bad graph detected in compute_lca_of_uses", n, early, LCA);
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3223 tty->print_cr("* Use %d isn't dominated by def %d *", use->_idx, n->_idx);
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3224 had_error = true;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3225 break;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3226 }
17887 cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3227 d = idom(d);
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3228 }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3229 }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3230 #endif
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3231 return had_error;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3232 }
0 a61af66fc99e Initial load duke parents: diff changeset	3233
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3234
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3235 Node* PhaseIdealLoop::compute_lca_of_uses(Node* n, Node* early, bool verify) {
0 a61af66fc99e Initial load duke parents: diff changeset	3236 // Compute LCA over list of uses
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3237 bool had_error = false;
0 a61af66fc99e Initial load duke parents: diff changeset	3238 Node *LCA = NULL;
a61af66fc99e Initial load duke parents: diff changeset	3239 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax && LCA != early; i++) {
a61af66fc99e Initial load duke parents: diff changeset	3240 Node* c = n->fast_out(i);
a61af66fc99e Initial load duke parents: diff changeset	3241 if (_nodes[c->_idx] == NULL)
a61af66fc99e Initial load duke parents: diff changeset	3242 continue; // Skip the occasional dead node
a61af66fc99e Initial load duke parents: diff changeset	3243 if( c->is_Phi() ) { // For Phis, we must land above on the path
a61af66fc99e Initial load duke parents: diff changeset	3244 for( uint j=1; j<c->req(); j++ ) {// For all inputs
a61af66fc99e Initial load duke parents: diff changeset	3245 if( c->in(j) == n ) { // Found matching input?
a61af66fc99e Initial load duke parents: diff changeset	3246 Node *use = c->in(0)->in(j);
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3247 if (_verify_only && use->is_top()) continue;
0 a61af66fc99e Initial load duke parents: diff changeset	3248 LCA = dom_lca_for_get_late_ctrl( LCA, use, n );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3249 if (verify) had_error = verify_dominance(n, use, LCA, early) \|\| had_error;
0 a61af66fc99e Initial load duke parents: diff changeset	3250 }
a61af66fc99e Initial load duke parents: diff changeset	3251 }
a61af66fc99e Initial load duke parents: diff changeset	3252 } else {
a61af66fc99e Initial load duke parents: diff changeset	3253 // For CFG data-users, use is in the block just prior
a61af66fc99e Initial load duke parents: diff changeset	3254 Node *use = has_ctrl(c) ? get_ctrl(c) : c->in(0);
a61af66fc99e Initial load duke parents: diff changeset	3255 LCA = dom_lca_for_get_late_ctrl( LCA, use, n );
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3256 if (verify) had_error = verify_dominance(n, use, LCA, early) \|\| had_error;
0 a61af66fc99e Initial load duke parents: diff changeset	3257 }
a61af66fc99e Initial load duke parents: diff changeset	3258 }
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3259 assert(!had_error, "bad dominance");
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3260 return LCA;
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3261 }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3262
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3263 //------------------------------get_late_ctrl----------------------------------
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3264 // Compute latest legal control.
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3265 Node PhaseIdealLoop::get_late_ctrl( Node n, Node *early ) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3266 assert(early != NULL, "early control should not be NULL");
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3267
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3268 Node* LCA = compute_lca_of_uses(n, early);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3269 #ifdef ASSERT
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3270 if (LCA == C->root() && LCA != early) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3271 // def doesn't dominate uses so print some useful debugging output
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3272 compute_lca_of_uses(n, early, true);
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3273 }
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3274 #endif
0 a61af66fc99e Initial load duke parents: diff changeset	3275
a61af66fc99e Initial load duke parents: diff changeset	3276 // if this is a load, check for anti-dependent stores
a61af66fc99e Initial load duke parents: diff changeset	3277 // We use a conservative algorithm to identify potential interfering
a61af66fc99e Initial load duke parents: diff changeset	3278 // instructions and for rescheduling the load. The users of the memory
a61af66fc99e Initial load duke parents: diff changeset	3279 // input of this load are examined. Any use which is not a load and is
a61af66fc99e Initial load duke parents: diff changeset	3280 // dominated by early is considered a potentially interfering store.
a61af66fc99e Initial load duke parents: diff changeset	3281 // This can produce false positives.
a61af66fc99e Initial load duke parents: diff changeset	3282 if (n->is_Load() && LCA != early) {
a61af66fc99e Initial load duke parents: diff changeset	3283 Node_List worklist;
a61af66fc99e Initial load duke parents: diff changeset	3284
a61af66fc99e Initial load duke parents: diff changeset	3285 Node *mem = n->in(MemNode::Memory);
a61af66fc99e Initial load duke parents: diff changeset	3286 for (DUIterator_Fast imax, i = mem->fast_outs(imax); i < imax; i++) {
a61af66fc99e Initial load duke parents: diff changeset	3287 Node* s = mem->fast_out(i);
a61af66fc99e Initial load duke parents: diff changeset	3288 worklist.push(s);
a61af66fc99e Initial load duke parents: diff changeset	3289 }
a61af66fc99e Initial load duke parents: diff changeset	3290 while(worklist.size() != 0 && LCA != early) {
a61af66fc99e Initial load duke parents: diff changeset	3291 Node* s = worklist.pop();
a61af66fc99e Initial load duke parents: diff changeset	3292 if (s->is_Load()) {
a61af66fc99e Initial load duke parents: diff changeset	3293 continue;
a61af66fc99e Initial load duke parents: diff changeset	3294 } else if (s->is_MergeMem()) {
a61af66fc99e Initial load duke parents: diff changeset	3295 for (DUIterator_Fast imax, i = s->fast_outs(imax); i < imax; i++) {
a61af66fc99e Initial load duke parents: diff changeset	3296 Node* s1 = s->fast_out(i);
a61af66fc99e Initial load duke parents: diff changeset	3297 worklist.push(s1);
a61af66fc99e Initial load duke parents: diff changeset	3298 }
a61af66fc99e Initial load duke parents: diff changeset	3299 } else {
a61af66fc99e Initial load duke parents: diff changeset	3300 Node *sctrl = has_ctrl(s) ? get_ctrl(s) : s->in(0);
a61af66fc99e Initial load duke parents: diff changeset	3301 assert(sctrl != NULL \|\| s->outcnt() == 0, "must have control");
a61af66fc99e Initial load duke parents: diff changeset	3302 if (sctrl != NULL && !sctrl->is_top() && is_dominator(early, sctrl)) {
a61af66fc99e Initial load duke parents: diff changeset	3303 LCA = dom_lca_for_get_late_ctrl(LCA, sctrl, n);
a61af66fc99e Initial load duke parents: diff changeset	3304 }
a61af66fc99e Initial load duke parents: diff changeset	3305 }
a61af66fc99e Initial load duke parents: diff changeset	3306 }
a61af66fc99e Initial load duke parents: diff changeset	3307 }
a61af66fc99e Initial load duke parents: diff changeset	3308
a61af66fc99e Initial load duke parents: diff changeset	3309 assert(LCA == find_non_split_ctrl(LCA), "unexpected late control");
a61af66fc99e Initial load duke parents: diff changeset	3310 return LCA;
a61af66fc99e Initial load duke parents: diff changeset	3311 }
a61af66fc99e Initial load duke parents: diff changeset	3312
a61af66fc99e Initial load duke parents: diff changeset	3313 // true if CFG node d dominates CFG node n
a61af66fc99e Initial load duke parents: diff changeset	3314 bool PhaseIdealLoop::is_dominator(Node d, Node n) {
a61af66fc99e Initial load duke parents: diff changeset	3315 if (d == n)
a61af66fc99e Initial load duke parents: diff changeset	3316 return true;
a61af66fc99e Initial load duke parents: diff changeset	3317 assert(d->is_CFG() && n->is_CFG(), "must have CFG nodes");
a61af66fc99e Initial load duke parents: diff changeset	3318 uint dd = dom_depth(d);
a61af66fc99e Initial load duke parents: diff changeset	3319 while (dom_depth(n) >= dd) {
a61af66fc99e Initial load duke parents: diff changeset	3320 if (n == d)
a61af66fc99e Initial load duke parents: diff changeset	3321 return true;
a61af66fc99e Initial load duke parents: diff changeset	3322 n = idom(n);
a61af66fc99e Initial load duke parents: diff changeset	3323 }
a61af66fc99e Initial load duke parents: diff changeset	3324 return false;
a61af66fc99e Initial load duke parents: diff changeset	3325 }
a61af66fc99e Initial load duke parents: diff changeset	3326
a61af66fc99e Initial load duke parents: diff changeset	3327 //------------------------------dom_lca_for_get_late_ctrl_internal-------------
a61af66fc99e Initial load duke parents: diff changeset	3328 // Pair-wise LCA with tags.
a61af66fc99e Initial load duke parents: diff changeset	3329 // Tag each index with the node 'tag' currently being processed
a61af66fc99e Initial load duke parents: diff changeset	3330 // before advancing up the dominator chain using idom().
a61af66fc99e Initial load duke parents: diff changeset	3331 // Later calls that find a match to 'tag' know that this path has already
a61af66fc99e Initial load duke parents: diff changeset	3332 // been considered in the current LCA (which is input 'n1' by convention).
a61af66fc99e Initial load duke parents: diff changeset	3333 // Since get_late_ctrl() is only called once for each node, the tag array
a61af66fc99e Initial load duke parents: diff changeset	3334 // does not need to be cleared between calls to get_late_ctrl().
a61af66fc99e Initial load duke parents: diff changeset	3335 // Algorithm trades a larger constant factor for better asymptotic behavior
a61af66fc99e Initial load duke parents: diff changeset	3336 //
a61af66fc99e Initial load duke parents: diff changeset	3337 Node PhaseIdealLoop::dom_lca_for_get_late_ctrl_internal( Node n1, Node n2, Node tag ) {
a61af66fc99e Initial load duke parents: diff changeset	3338 uint d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3339 uint d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3340
a61af66fc99e Initial load duke parents: diff changeset	3341 do {
a61af66fc99e Initial load duke parents: diff changeset	3342 if (d1 > d2) {
a61af66fc99e Initial load duke parents: diff changeset	3343 // current lca is deeper than n2
a61af66fc99e Initial load duke parents: diff changeset	3344 _dom_lca_tags.map(n1->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3345 n1 = idom(n1);
a61af66fc99e Initial load duke parents: diff changeset	3346 d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3347 } else if (d1 < d2) {
a61af66fc99e Initial load duke parents: diff changeset	3348 // n2 is deeper than current lca
a61af66fc99e Initial load duke parents: diff changeset	3349 Node *memo = _dom_lca_tags[n2->_idx];
a61af66fc99e Initial load duke parents: diff changeset	3350 if( memo == tag ) {
a61af66fc99e Initial load duke parents: diff changeset	3351 return n1; // Return the current LCA
a61af66fc99e Initial load duke parents: diff changeset	3352 }
a61af66fc99e Initial load duke parents: diff changeset	3353 _dom_lca_tags.map(n2->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3354 n2 = idom(n2);
a61af66fc99e Initial load duke parents: diff changeset	3355 d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3356 } else {
a61af66fc99e Initial load duke parents: diff changeset	3357 // Here d1 == d2. Due to edits of the dominator-tree, sections
a61af66fc99e Initial load duke parents: diff changeset	3358 // of the tree might have the same depth. These sections have
a61af66fc99e Initial load duke parents: diff changeset	3359 // to be searched more carefully.
a61af66fc99e Initial load duke parents: diff changeset	3360
a61af66fc99e Initial load duke parents: diff changeset	3361 // Scan up all the n1's with equal depth, looking for n2.
a61af66fc99e Initial load duke parents: diff changeset	3362 _dom_lca_tags.map(n1->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3363 Node *t1 = idom(n1);
a61af66fc99e Initial load duke parents: diff changeset	3364 while (dom_depth(t1) == d1) {
a61af66fc99e Initial load duke parents: diff changeset	3365 if (t1 == n2) return n2;
a61af66fc99e Initial load duke parents: diff changeset	3366 _dom_lca_tags.map(t1->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3367 t1 = idom(t1);
a61af66fc99e Initial load duke parents: diff changeset	3368 }
a61af66fc99e Initial load duke parents: diff changeset	3369 // Scan up all the n2's with equal depth, looking for n1.
a61af66fc99e Initial load duke parents: diff changeset	3370 _dom_lca_tags.map(n2->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3371 Node *t2 = idom(n2);
a61af66fc99e Initial load duke parents: diff changeset	3372 while (dom_depth(t2) == d2) {
a61af66fc99e Initial load duke parents: diff changeset	3373 if (t2 == n1) return n1;
a61af66fc99e Initial load duke parents: diff changeset	3374 _dom_lca_tags.map(t2->_idx, tag);
a61af66fc99e Initial load duke parents: diff changeset	3375 t2 = idom(t2);
a61af66fc99e Initial load duke parents: diff changeset	3376 }
a61af66fc99e Initial load duke parents: diff changeset	3377 // Move up to a new dominator-depth value as well as up the dom-tree.
a61af66fc99e Initial load duke parents: diff changeset	3378 n1 = t1;
a61af66fc99e Initial load duke parents: diff changeset	3379 n2 = t2;
a61af66fc99e Initial load duke parents: diff changeset	3380 d1 = dom_depth(n1);
a61af66fc99e Initial load duke parents: diff changeset	3381 d2 = dom_depth(n2);
a61af66fc99e Initial load duke parents: diff changeset	3382 }
a61af66fc99e Initial load duke parents: diff changeset	3383 } while (n1 != n2);
a61af66fc99e Initial load duke parents: diff changeset	3384 return n1;
a61af66fc99e Initial load duke parents: diff changeset	3385 }
a61af66fc99e Initial load duke parents: diff changeset	3386
a61af66fc99e Initial load duke parents: diff changeset	3387 //------------------------------init_dom_lca_tags------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3388 // Tag could be a node's integer index, 32bits instead of 64bits in some cases
a61af66fc99e Initial load duke parents: diff changeset	3389 // Intended use does not involve any growth for the array, so it could
a61af66fc99e Initial load duke parents: diff changeset	3390 // be of fixed size.
a61af66fc99e Initial load duke parents: diff changeset	3391 void PhaseIdealLoop::init_dom_lca_tags() {
a61af66fc99e Initial load duke parents: diff changeset	3392 uint limit = C->unique() + 1;
a61af66fc99e Initial load duke parents: diff changeset	3393 _dom_lca_tags.map( limit, NULL );
a61af66fc99e Initial load duke parents: diff changeset	3394 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3395 for( uint i = 0; i < limit; ++i ) {
a61af66fc99e Initial load duke parents: diff changeset	3396 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer");
a61af66fc99e Initial load duke parents: diff changeset	3397 }
a61af66fc99e Initial load duke parents: diff changeset	3398 #endif // ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3399 }
a61af66fc99e Initial load duke parents: diff changeset	3400
a61af66fc99e Initial load duke parents: diff changeset	3401 //------------------------------clear_dom_lca_tags------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3402 // Tag could be a node's integer index, 32bits instead of 64bits in some cases
a61af66fc99e Initial load duke parents: diff changeset	3403 // Intended use does not involve any growth for the array, so it could
a61af66fc99e Initial load duke parents: diff changeset	3404 // be of fixed size.
a61af66fc99e Initial load duke parents: diff changeset	3405 void PhaseIdealLoop::clear_dom_lca_tags() {
a61af66fc99e Initial load duke parents: diff changeset	3406 uint limit = C->unique() + 1;
a61af66fc99e Initial load duke parents: diff changeset	3407 _dom_lca_tags.map( limit, NULL );
a61af66fc99e Initial load duke parents: diff changeset	3408 _dom_lca_tags.clear();
a61af66fc99e Initial load duke parents: diff changeset	3409 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3410 for( uint i = 0; i < limit; ++i ) {
a61af66fc99e Initial load duke parents: diff changeset	3411 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer");
a61af66fc99e Initial load duke parents: diff changeset	3412 }
a61af66fc99e Initial load duke parents: diff changeset	3413 #endif // ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3414 }
a61af66fc99e Initial load duke parents: diff changeset	3415
a61af66fc99e Initial load duke parents: diff changeset	3416 //------------------------------build_loop_late--------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3417 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping.
a61af66fc99e Initial load duke parents: diff changeset	3418 // Second pass finds latest legal placement, and ideal loop placement.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3419 void PhaseIdealLoop::build_loop_late( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) {
0 a61af66fc99e Initial load duke parents: diff changeset	3420 while (worklist.size() != 0) {
a61af66fc99e Initial load duke parents: diff changeset	3421 Node *n = worklist.pop();
a61af66fc99e Initial load duke parents: diff changeset	3422 // Only visit once
a61af66fc99e Initial load duke parents: diff changeset	3423 if (visited.test_set(n->_idx)) continue;
a61af66fc99e Initial load duke parents: diff changeset	3424 uint cnt = n->outcnt();
a61af66fc99e Initial load duke parents: diff changeset	3425 uint i = 0;
a61af66fc99e Initial load duke parents: diff changeset	3426 while (true) {
a61af66fc99e Initial load duke parents: diff changeset	3427 assert( _nodes[n->_idx], "no dead nodes" );
a61af66fc99e Initial load duke parents: diff changeset	3428 // Visit all children
a61af66fc99e Initial load duke parents: diff changeset	3429 if (i < cnt) {
a61af66fc99e Initial load duke parents: diff changeset	3430 Node* use = n->raw_out(i);
a61af66fc99e Initial load duke parents: diff changeset	3431 ++i;
a61af66fc99e Initial load duke parents: diff changeset	3432 // Check for dead uses. Aggressively prune such junk. It might be
a61af66fc99e Initial load duke parents: diff changeset	3433 // dead in the global sense, but still have local uses so I cannot
a61af66fc99e Initial load duke parents: diff changeset	3434 // easily call 'remove_dead_node'.
a61af66fc99e Initial load duke parents: diff changeset	3435 if( _nodes[use->_idx] != NULL \|\| use->is_top() ) { // Not dead?
a61af66fc99e Initial load duke parents: diff changeset	3436 // Due to cycles, we might not hit the same fixed point in the verify
a61af66fc99e Initial load duke parents: diff changeset	3437 // pass as we do in the regular pass. Instead, visit such phis as
a61af66fc99e Initial load duke parents: diff changeset	3438 // simple uses of the loop head.
a61af66fc99e Initial load duke parents: diff changeset	3439 if( use->in(0) && (use->is_CFG() \|\| use->is_Phi()) ) {
a61af66fc99e Initial load duke parents: diff changeset	3440 if( !visited.test(use->_idx) )
a61af66fc99e Initial load duke parents: diff changeset	3441 worklist.push(use);
a61af66fc99e Initial load duke parents: diff changeset	3442 } else if( !visited.test_set(use->_idx) ) {
a61af66fc99e Initial load duke parents: diff changeset	3443 nstack.push(n, i); // Save parent and next use's index.
a61af66fc99e Initial load duke parents: diff changeset	3444 n = use; // Process all children of current use.
a61af66fc99e Initial load duke parents: diff changeset	3445 cnt = use->outcnt();
a61af66fc99e Initial load duke parents: diff changeset	3446 i = 0;
a61af66fc99e Initial load duke parents: diff changeset	3447 }
a61af66fc99e Initial load duke parents: diff changeset	3448 } else {
a61af66fc99e Initial load duke parents: diff changeset	3449 // Do not visit around the backedge of loops via data edges.
a61af66fc99e Initial load duke parents: diff changeset	3450 // push dead code onto a worklist
a61af66fc99e Initial load duke parents: diff changeset	3451 _deadlist.push(use);
a61af66fc99e Initial load duke parents: diff changeset	3452 }
a61af66fc99e Initial load duke parents: diff changeset	3453 } else {
a61af66fc99e Initial load duke parents: diff changeset	3454 // All of n's children have been processed, complete post-processing.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3455 build_loop_late_post(n);
0 a61af66fc99e Initial load duke parents: diff changeset	3456 if (nstack.is_empty()) {
a61af66fc99e Initial load duke parents: diff changeset	3457 // Finished all nodes on stack.
a61af66fc99e Initial load duke parents: diff changeset	3458 // Process next node on the worklist.
a61af66fc99e Initial load duke parents: diff changeset	3459 break;
a61af66fc99e Initial load duke parents: diff changeset	3460 }
a61af66fc99e Initial load duke parents: diff changeset	3461 // Get saved parent node and next use's index. Visit the rest of uses.
a61af66fc99e Initial load duke parents: diff changeset	3462 n = nstack.node();
a61af66fc99e Initial load duke parents: diff changeset	3463 cnt = n->outcnt();
a61af66fc99e Initial load duke parents: diff changeset	3464 i = nstack.index();
a61af66fc99e Initial load duke parents: diff changeset	3465 nstack.pop();
a61af66fc99e Initial load duke parents: diff changeset	3466 }
a61af66fc99e Initial load duke parents: diff changeset	3467 }
a61af66fc99e Initial load duke parents: diff changeset	3468 }
a61af66fc99e Initial load duke parents: diff changeset	3469 }
a61af66fc99e Initial load duke parents: diff changeset	3470
a61af66fc99e Initial load duke parents: diff changeset	3471 //------------------------------build_loop_late_post---------------------------
a61af66fc99e Initial load duke parents: diff changeset	3472 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping.
a61af66fc99e Initial load duke parents: diff changeset	3473 // Second pass finds latest legal placement, and ideal loop placement.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3474 void PhaseIdealLoop::build_loop_late_post( Node *n ) {
0 a61af66fc99e Initial load duke parents: diff changeset	3475
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3476 if (n->req() == 2 && n->Opcode() == Op_ConvI2L && !C->major_progress() && !_verify_only) {
0 a61af66fc99e Initial load duke parents: diff changeset	3477 _igvn._worklist.push(n); // Maybe we'll normalize it, if no more loops.
a61af66fc99e Initial load duke parents: diff changeset	3478 }
a61af66fc99e Initial load duke parents: diff changeset	3479
17887 cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3480 #ifdef ASSERT
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3481 if (_verify_only && !n->is_CFG()) {
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3482 // Check def-use domination.
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3483 compute_lca_of_uses(n, get_ctrl(n), true /* verify */);
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3484 }
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3485 #endif
cd3c534f8f4a 8039050: Crash in C2 compiler at Node::rematerialize kvn parents: 12956 diff changeset	3486
0 a61af66fc99e Initial load duke parents: diff changeset	3487 // CFG and pinned nodes already handled
a61af66fc99e Initial load duke parents: diff changeset	3488 if( n->in(0) ) {
a61af66fc99e Initial load duke parents: diff changeset	3489 if( n->in(0)->is_top() ) return; // Dead?
a61af66fc99e Initial load duke parents: diff changeset	3490
a61af66fc99e Initial load duke parents: diff changeset	3491 // We'd like +VerifyLoopOptimizations to not believe that Mod's/Loads
a61af66fc99e Initial load duke parents: diff changeset	3492 // _must_ be pinned (they have to observe their control edge of course).
a61af66fc99e Initial load duke parents: diff changeset	3493 // Unlike Stores (which modify an unallocable resource, the memory
a61af66fc99e Initial load duke parents: diff changeset	3494 // state), Mods/Loads can float around. So free them up.
a61af66fc99e Initial load duke parents: diff changeset	3495 bool pinned = true;
a61af66fc99e Initial load duke parents: diff changeset	3496 switch( n->Opcode() ) {
a61af66fc99e Initial load duke parents: diff changeset	3497 case Op_DivI:
a61af66fc99e Initial load duke parents: diff changeset	3498 case Op_DivF:
a61af66fc99e Initial load duke parents: diff changeset	3499 case Op_DivD:
a61af66fc99e Initial load duke parents: diff changeset	3500 case Op_ModI:
a61af66fc99e Initial load duke parents: diff changeset	3501 case Op_ModF:
a61af66fc99e Initial load duke parents: diff changeset	3502 case Op_ModD:
a61af66fc99e Initial load duke parents: diff changeset	3503 case Op_LoadB: // Same with Loads; they can sink
6179 8c92982cbbc4 7119644: Increase superword's vector size up to 256 bits kvn parents: 6144 diff changeset	3504 case Op_LoadUB: // during loop optimizations.
8c92982cbbc4 7119644: Increase superword's vector size up to 256 bits kvn parents: 6144 diff changeset	3505 case Op_LoadUS:
0 a61af66fc99e Initial load duke parents: diff changeset	3506 case Op_LoadD:
a61af66fc99e Initial load duke parents: diff changeset	3507 case Op_LoadF:
a61af66fc99e Initial load duke parents: diff changeset	3508 case Op_LoadI:
a61af66fc99e Initial load duke parents: diff changeset	3509 case Op_LoadKlass:
293 c3e045194476 6731641: assert(m->adr_type() == mach->adr_type(),"matcher should not change adr type") kvn parents: 235 diff changeset	3510 case Op_LoadNKlass:
0 a61af66fc99e Initial load duke parents: diff changeset	3511 case Op_LoadL:
a61af66fc99e Initial load duke parents: diff changeset	3512 case Op_LoadS:
a61af66fc99e Initial load duke parents: diff changeset	3513 case Op_LoadP:
293 c3e045194476 6731641: assert(m->adr_type() == mach->adr_type(),"matcher should not change adr type") kvn parents: 235 diff changeset	3514 case Op_LoadN:
0 a61af66fc99e Initial load duke parents: diff changeset	3515 case Op_LoadRange:
a61af66fc99e Initial load duke parents: diff changeset	3516 case Op_LoadD_unaligned:
a61af66fc99e Initial load duke parents: diff changeset	3517 case Op_LoadL_unaligned:
a61af66fc99e Initial load duke parents: diff changeset	3518 case Op_StrComp: // Does a bunch of load-like effects
681 fbde8ec322d0 6761600: Use sse 4.2 in intrinsics cfang parents: 628 diff changeset	3519 case Op_StrEquals:
fbde8ec322d0 6761600: Use sse 4.2 in intrinsics cfang parents: 628 diff changeset	3520 case Op_StrIndexOf:
169 9148c65abefc 6695049: (coll) Create an x86 intrinsic for Arrays.equals rasbold parents: 39 diff changeset	3521 case Op_AryEq:
0 a61af66fc99e Initial load duke parents: diff changeset	3522 pinned = false;
a61af66fc99e Initial load duke parents: diff changeset	3523 }
a61af66fc99e Initial load duke parents: diff changeset	3524 if( pinned ) {
605 98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3525 IdealLoopTree *chosen_loop = get_loop(n->is_CFG() ? n : get_ctrl(n));
98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3526 if( !chosen_loop->_child ) // Inner loop?
98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3527 chosen_loop->_body.push(n); // Collect inner loops
0 a61af66fc99e Initial load duke parents: diff changeset	3528 return;
a61af66fc99e Initial load duke parents: diff changeset	3529 }
a61af66fc99e Initial load duke parents: diff changeset	3530 } else { // No slot zero
a61af66fc99e Initial load duke parents: diff changeset	3531 if( n->is_CFG() ) { // CFG with no slot 0 is dead
a61af66fc99e Initial load duke parents: diff changeset	3532 _nodes.map(n->_idx,0); // No block setting, it's globally dead
a61af66fc99e Initial load duke parents: diff changeset	3533 return;
a61af66fc99e Initial load duke parents: diff changeset	3534 }
a61af66fc99e Initial load duke parents: diff changeset	3535 assert(!n->is_CFG() \|\| n->outcnt() == 0, "");
a61af66fc99e Initial load duke parents: diff changeset	3536 }
a61af66fc99e Initial load duke parents: diff changeset	3537
a61af66fc99e Initial load duke parents: diff changeset	3538 // Do I have a "safe range" I can select over?
a61af66fc99e Initial load duke parents: diff changeset	3539 Node *early = get_ctrl(n);// Early location already computed
a61af66fc99e Initial load duke parents: diff changeset	3540
a61af66fc99e Initial load duke parents: diff changeset	3541 // Compute latest point this Node can go
a61af66fc99e Initial load duke parents: diff changeset	3542 Node *LCA = get_late_ctrl( n, early );
a61af66fc99e Initial load duke parents: diff changeset	3543 // LCA is NULL due to uses being dead
a61af66fc99e Initial load duke parents: diff changeset	3544 if( LCA == NULL ) {
a61af66fc99e Initial load duke parents: diff changeset	3545 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3546 for (DUIterator i1 = n->outs(); n->has_out(i1); i1++) {
a61af66fc99e Initial load duke parents: diff changeset	3547 assert( _nodes[n->out(i1)->_idx] == NULL, "all uses must also be dead");
a61af66fc99e Initial load duke parents: diff changeset	3548 }
a61af66fc99e Initial load duke parents: diff changeset	3549 #endif
a61af66fc99e Initial load duke parents: diff changeset	3550 _nodes.map(n->_idx, 0); // This node is useless
a61af66fc99e Initial load duke parents: diff changeset	3551 _deadlist.push(n);
a61af66fc99e Initial load duke parents: diff changeset	3552 return;
a61af66fc99e Initial load duke parents: diff changeset	3553 }
a61af66fc99e Initial load duke parents: diff changeset	3554 assert(LCA != NULL && !LCA->is_top(), "no dead nodes");
a61af66fc99e Initial load duke parents: diff changeset	3555
a61af66fc99e Initial load duke parents: diff changeset	3556 Node *legal = LCA; // Walk 'legal' up the IDOM chain
a61af66fc99e Initial load duke parents: diff changeset	3557 Node *least = legal; // Best legal position so far
a61af66fc99e Initial load duke parents: diff changeset	3558 while( early != legal ) { // While not at earliest legal
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3559 #ifdef ASSERT
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3560 if (legal->is_Start() && !early->is_Root()) {
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3561 // Bad graph. Print idom path and fail.
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	3562 dump_bad_graph("Bad graph detected in build_loop_late", n, early, LCA);
1172 b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3563 assert(false, "Bad graph detected in build_loop_late");
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3564 }
b2b6a9bf6238 6894779: Loop Predication for Loop Optimizer in C2 cfang parents: 1083 diff changeset	3565 #endif
0 a61af66fc99e Initial load duke parents: diff changeset	3566 // Find least loop nesting depth
a61af66fc99e Initial load duke parents: diff changeset	3567 legal = idom(legal); // Bump up the IDOM tree
a61af66fc99e Initial load duke parents: diff changeset	3568 // Check for lower nesting depth
a61af66fc99e Initial load duke parents: diff changeset	3569 if( get_loop(legal)->_nest < get_loop(least)->_nest )
a61af66fc99e Initial load duke parents: diff changeset	3570 least = legal;
a61af66fc99e Initial load duke parents: diff changeset	3571 }
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3572 assert(early == legal \|\| legal != C->root(), "bad dominance of inputs");
0 a61af66fc99e Initial load duke parents: diff changeset	3573
a61af66fc99e Initial load duke parents: diff changeset	3574 // Try not to place code on a loop entry projection
a61af66fc99e Initial load duke parents: diff changeset	3575 // which can inhibit range check elimination.
a61af66fc99e Initial load duke parents: diff changeset	3576 if (least != early) {
a61af66fc99e Initial load duke parents: diff changeset	3577 Node* ctrl_out = least->unique_ctrl_out();
a61af66fc99e Initial load duke parents: diff changeset	3578 if (ctrl_out && ctrl_out->is_CountedLoop() &&
a61af66fc99e Initial load duke parents: diff changeset	3579 least == ctrl_out->in(LoopNode::EntryControl)) {
a61af66fc99e Initial load duke parents: diff changeset	3580 Node* least_dom = idom(least);
a61af66fc99e Initial load duke parents: diff changeset	3581 if (get_loop(least_dom)->is_member(get_loop(least))) {
a61af66fc99e Initial load duke parents: diff changeset	3582 least = least_dom;
a61af66fc99e Initial load duke parents: diff changeset	3583 }
a61af66fc99e Initial load duke parents: diff changeset	3584 }
a61af66fc99e Initial load duke parents: diff changeset	3585 }
a61af66fc99e Initial load duke parents: diff changeset	3586
a61af66fc99e Initial load duke parents: diff changeset	3587 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	3588 // If verifying, verify that 'verify_me' has a legal location
a61af66fc99e Initial load duke parents: diff changeset	3589 // and choose it as our location.
921 046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3590 if( _verify_me ) {
046932b72aa2 6862956: PhaseIdealLoop should have a CFG verification mode never parents: 681 diff changeset	3591 Node *v_ctrl = _verify_me->get_ctrl_no_update(n);
0 a61af66fc99e Initial load duke parents: diff changeset	3592 Node *legal = LCA;
a61af66fc99e Initial load duke parents: diff changeset	3593 while( early != legal ) { // While not at earliest legal
a61af66fc99e Initial load duke parents: diff changeset	3594 if( legal == v_ctrl ) break; // Check for prior good location
a61af66fc99e Initial load duke parents: diff changeset	3595 legal = idom(legal) ;// Bump up the IDOM tree
a61af66fc99e Initial load duke parents: diff changeset	3596 }
a61af66fc99e Initial load duke parents: diff changeset	3597 // Check for prior good location
a61af66fc99e Initial load duke parents: diff changeset	3598 if( legal == v_ctrl ) least = legal; // Keep prior if found
a61af66fc99e Initial load duke parents: diff changeset	3599 }
a61af66fc99e Initial load duke parents: diff changeset	3600 #endif
a61af66fc99e Initial load duke parents: diff changeset	3601
a61af66fc99e Initial load duke parents: diff changeset	3602 // Assign discovered "here or above" point
a61af66fc99e Initial load duke parents: diff changeset	3603 least = find_non_split_ctrl(least);
a61af66fc99e Initial load duke parents: diff changeset	3604 set_ctrl(n, least);
a61af66fc99e Initial load duke parents: diff changeset	3605
a61af66fc99e Initial load duke parents: diff changeset	3606 // Collect inner loop bodies
605 98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3607 IdealLoopTree *chosen_loop = get_loop(least);
98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3608 if( !chosen_loop->_child ) // Inner loop?
98cb887364d3 6810672: Comment typos twisti parents: 558 diff changeset	3609 chosen_loop->_body.push(n);// Collect inner loops
0 a61af66fc99e Initial load duke parents: diff changeset	3610 }
a61af66fc99e Initial load duke parents: diff changeset	3611
4779 c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3612 #ifdef ASSERT
8048 8b3da8d14c93 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob roland parents: 6846 diff changeset	3613 void PhaseIdealLoop::dump_bad_graph(const char* msg, Node* n, Node* early, Node* LCA) {
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 17914 diff changeset	3614 tty->print_cr("%s", msg);
4779 c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3615 tty->print("n: "); n->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3616 tty->print("early(n): "); early->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3617 if (n->in(0) != NULL && !n->in(0)->is_top() &&
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3618 n->in(0) != early && !n->in(0)->is_Root()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3619 tty->print("n->in(0): "); n->in(0)->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3620 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3621 for (uint i = 1; i < n->req(); i++) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3622 Node* in1 = n->in(i);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3623 if (in1 != NULL && in1 != n && !in1->is_top()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3624 tty->print("n->in(%d): ", i); in1->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3625 Node* in1_early = get_ctrl(in1);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3626 tty->print("early(n->in(%d)): ", i); in1_early->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3627 if (in1->in(0) != NULL && !in1->in(0)->is_top() &&
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3628 in1->in(0) != in1_early && !in1->in(0)->is_Root()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3629 tty->print("n->in(%d)->in(0): ", i); in1->in(0)->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3630 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3631 for (uint j = 1; j < in1->req(); j++) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3632 Node* in2 = in1->in(j);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3633 if (in2 != NULL && in2 != n && in2 != in1 && !in2->is_top()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3634 tty->print("n->in(%d)->in(%d): ", i, j); in2->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3635 Node* in2_early = get_ctrl(in2);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3636 tty->print("early(n->in(%d)->in(%d)): ", i, j); in2_early->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3637 if (in2->in(0) != NULL && !in2->in(0)->is_top() &&
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3638 in2->in(0) != in2_early && !in2->in(0)->is_Root()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3639 tty->print("n->in(%d)->in(%d)->in(0): ", i, j); in2->in(0)->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3640 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3641 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3642 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3643 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3644 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3645 tty->cr();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3646 tty->print("LCA(n): "); LCA->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3647 for (uint i = 0; i < n->outcnt(); i++) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3648 Node* u1 = n->raw_out(i);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3649 if (u1 == n)
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3650 continue;
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3651 tty->print("n->out(%d): ", i); u1->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3652 if (u1->is_CFG()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3653 for (uint j = 0; j < u1->outcnt(); j++) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3654 Node* u2 = u1->raw_out(j);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3655 if (u2 != u1 && u2 != n && u2->is_CFG()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3656 tty->print("n->out(%d)->out(%d): ", i, j); u2->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3657 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3658 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3659 } else {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3660 Node* u1_later = get_ctrl(u1);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3661 tty->print("later(n->out(%d)): ", i); u1_later->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3662 if (u1->in(0) != NULL && !u1->in(0)->is_top() &&
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3663 u1->in(0) != u1_later && !u1->in(0)->is_Root()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3664 tty->print("n->out(%d)->in(0): ", i); u1->in(0)->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3665 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3666 for (uint j = 0; j < u1->outcnt(); j++) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3667 Node* u2 = u1->raw_out(j);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3668 if (u2 == n \|\| u2 == u1)
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3669 continue;
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3670 tty->print("n->out(%d)->out(%d): ", i, j); u2->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3671 if (!u2->is_CFG()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3672 Node* u2_later = get_ctrl(u2);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3673 tty->print("later(n->out(%d)->out(%d)): ", i, j); u2_later->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3674 if (u2->in(0) != NULL && !u2->in(0)->is_top() &&
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3675 u2->in(0) != u2_later && !u2->in(0)->is_Root()) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3676 tty->print("n->out(%d)->in(0): ", i); u2->in(0)->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3677 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3678 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3679 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3680 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3681 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3682 tty->cr();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3683 int ct = 0;
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3684 Node *dbg_legal = LCA;
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3685 while(!dbg_legal->is_Start() && ct < 100) {
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3686 tty->print("idom[%d] ",ct); dbg_legal->dump();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3687 ct++;
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3688 dbg_legal = idom(dbg_legal);
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3689 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3690 tty->cr();
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3691 }
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3692 #endif
c8d8e124380c 7064302: JDK7 build 147 crashed after testing my java 6-compiled web app kvn parents: 4115 diff changeset	3693
0 a61af66fc99e Initial load duke parents: diff changeset	3694 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	3695 //------------------------------dump-------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3696 void PhaseIdealLoop::dump( ) const {
a61af66fc99e Initial load duke parents: diff changeset	3697 ResourceMark rm;
a61af66fc99e Initial load duke parents: diff changeset	3698 Arena* arena = Thread::current()->resource_area();
23421 c1091733abe6 8011858: Use Compile::live_nodes() instead of Compile::unique() in appropriate places zmajo parents: 22842 diff changeset	3699 Node_Stack stack(arena, C->live_nodes() >> 2);
0 a61af66fc99e Initial load duke parents: diff changeset	3700 Node_List rpo_list;
a61af66fc99e Initial load duke parents: diff changeset	3701 VectorSet visited(arena);
a61af66fc99e Initial load duke parents: diff changeset	3702 visited.set(C->top()->_idx);
a61af66fc99e Initial load duke parents: diff changeset	3703 rpo( C->root(), stack, visited, rpo_list );
a61af66fc99e Initial load duke parents: diff changeset	3704 // Dump root loop indexed by last element in PO order
a61af66fc99e Initial load duke parents: diff changeset	3705 dump( _ltree_root, rpo_list.size(), rpo_list );
a61af66fc99e Initial load duke parents: diff changeset	3706 }
a61af66fc99e Initial load duke parents: diff changeset	3707
a61af66fc99e Initial load duke parents: diff changeset	3708 void PhaseIdealLoop::dump( IdealLoopTree *loop, uint idx, Node_List &rpo_list ) const {
367 194b8e3a2fc4 6384206: Phis which are later unneeded are impairing our ability to inline based on static types never parents: 293 diff changeset	3709 loop->dump_head();
0 a61af66fc99e Initial load duke parents: diff changeset	3710
a61af66fc99e Initial load duke parents: diff changeset	3711 // Now scan for CFG nodes in the same loop
a61af66fc99e Initial load duke parents: diff changeset	3712 for( uint j=idx; j > 0; j-- ) {
a61af66fc99e Initial load duke parents: diff changeset	3713 Node *n = rpo_list[j-1];
a61af66fc99e Initial load duke parents: diff changeset	3714 if( !_nodes[n->_idx] ) // Skip dead nodes
a61af66fc99e Initial load duke parents: diff changeset	3715 continue;
a61af66fc99e Initial load duke parents: diff changeset	3716 if( get_loop(n) != loop ) { // Wrong loop nest
a61af66fc99e Initial load duke parents: diff changeset	3717 if( get_loop(n)->_head == n && // Found nested loop?
a61af66fc99e Initial load duke parents: diff changeset	3718 get_loop(n)->_parent == loop )
a61af66fc99e Initial load duke parents: diff changeset	3719 dump(get_loop(n),rpo_list.size(),rpo_list); // Print it nested-ly
a61af66fc99e Initial load duke parents: diff changeset	3720 continue;
a61af66fc99e Initial load duke parents: diff changeset	3721 }
a61af66fc99e Initial load duke parents: diff changeset	3722
a61af66fc99e Initial load duke parents: diff changeset	3723 // Dump controlling node
a61af66fc99e Initial load duke parents: diff changeset	3724 for( uint x = 0; x < loop->_nest; x++ )
a61af66fc99e Initial load duke parents: diff changeset	3725 tty->print(" ");
a61af66fc99e Initial load duke parents: diff changeset	3726 tty->print("C");
a61af66fc99e Initial load duke parents: diff changeset	3727 if( n == C->root() ) {
a61af66fc99e Initial load duke parents: diff changeset	3728 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	3729 } else {
a61af66fc99e Initial load duke parents: diff changeset	3730 Node* cached_idom = idom_no_update(n);
a61af66fc99e Initial load duke parents: diff changeset	3731 Node *computed_idom = n->in(0);
a61af66fc99e Initial load duke parents: diff changeset	3732 if( n->is_Region() ) {
a61af66fc99e Initial load duke parents: diff changeset	3733 computed_idom = compute_idom(n);
a61af66fc99e Initial load duke parents: diff changeset	3734 // computed_idom() will return n->in(0) when idom(n) is an IfNode (or
a61af66fc99e Initial load duke parents: diff changeset	3735 // any MultiBranch ctrl node), so apply a similar transform to
a61af66fc99e Initial load duke parents: diff changeset	3736 // the cached idom returned from idom_no_update.
a61af66fc99e Initial load duke parents: diff changeset	3737 cached_idom = find_non_split_ctrl(cached_idom);
a61af66fc99e Initial load duke parents: diff changeset	3738 }
a61af66fc99e Initial load duke parents: diff changeset	3739 tty->print(" ID:%d",computed_idom->_idx);
a61af66fc99e Initial load duke parents: diff changeset	3740 n->dump();
a61af66fc99e Initial load duke parents: diff changeset	3741 if( cached_idom != computed_idom ) {
a61af66fc99e Initial load duke parents: diff changeset	3742 tty->print_cr("*** BROKEN IDOM! Computed as: %d, cached as: %d",
a61af66fc99e Initial load duke parents: diff changeset	3743 computed_idom->_idx, cached_idom->_idx);
a61af66fc99e Initial load duke parents: diff changeset	3744 }
a61af66fc99e Initial load duke parents: diff changeset	3745 }
a61af66fc99e Initial load duke parents: diff changeset	3746 // Dump nodes it controls
a61af66fc99e Initial load duke parents: diff changeset	3747 for( uint k = 0; k < _nodes.Size(); k++ ) {
a61af66fc99e Initial load duke parents: diff changeset	3748 // (k < C->unique() && get_ctrl(find(k)) == n)
a61af66fc99e Initial load duke parents: diff changeset	3749 if (k < C->unique() && _nodes[k] == (Node*)((intptr_t)n + 1)) {
a61af66fc99e Initial load duke parents: diff changeset	3750 Node *m = C->root()->find(k);
a61af66fc99e Initial load duke parents: diff changeset	3751 if( m && m->outcnt() > 0 ) {
a61af66fc99e Initial load duke parents: diff changeset	3752 if (!(has_ctrl(m) && get_ctrl_no_update(m) == n)) {
a61af66fc99e Initial load duke parents: diff changeset	3753 tty->print_cr("*** BROKEN CTRL ACCESSOR! _nodes[k] is %p, ctrl is %p",
a61af66fc99e Initial load duke parents: diff changeset	3754 _nodes[k], has_ctrl(m) ? get_ctrl_no_update(m) : NULL);
a61af66fc99e Initial load duke parents: diff changeset	3755 }
a61af66fc99e Initial load duke parents: diff changeset	3756 for( uint j = 0; j < loop->_nest; j++ )
a61af66fc99e Initial load duke parents: diff changeset	3757 tty->print(" ");
a61af66fc99e Initial load duke parents: diff changeset	3758 tty->print(" ");
a61af66fc99e Initial load duke parents: diff changeset	3759 m->dump();
a61af66fc99e Initial load duke parents: diff changeset	3760 }
a61af66fc99e Initial load duke parents: diff changeset	3761 }
a61af66fc99e Initial load duke parents: diff changeset	3762 }
a61af66fc99e Initial load duke parents: diff changeset	3763 }
a61af66fc99e Initial load duke parents: diff changeset	3764 }
a61af66fc99e Initial load duke parents: diff changeset	3765
a61af66fc99e Initial load duke parents: diff changeset	3766 // Collect a R-P-O for the whole CFG.
a61af66fc99e Initial load duke parents: diff changeset	3767 // Result list is in post-order (scan backwards for RPO)
a61af66fc99e Initial load duke parents: diff changeset	3768 void PhaseIdealLoop::rpo( Node *start, Node_Stack &stk, VectorSet &visited, Node_List &rpo_list ) const {
a61af66fc99e Initial load duke parents: diff changeset	3769 stk.push(start, 0);
a61af66fc99e Initial load duke parents: diff changeset	3770 visited.set(start->_idx);
a61af66fc99e Initial load duke parents: diff changeset	3771
a61af66fc99e Initial load duke parents: diff changeset	3772 while (stk.is_nonempty()) {
a61af66fc99e Initial load duke parents: diff changeset	3773 Node* m = stk.node();
a61af66fc99e Initial load duke parents: diff changeset	3774 uint idx = stk.index();
a61af66fc99e Initial load duke parents: diff changeset	3775 if (idx < m->outcnt()) {
a61af66fc99e Initial load duke parents: diff changeset	3776 stk.set_index(idx + 1);
a61af66fc99e Initial load duke parents: diff changeset	3777 Node* n = m->raw_out(idx);
a61af66fc99e Initial load duke parents: diff changeset	3778 if (n->is_CFG() && !visited.test_set(n->_idx)) {
a61af66fc99e Initial load duke parents: diff changeset	3779 stk.push(n, 0);
a61af66fc99e Initial load duke parents: diff changeset	3780 }
a61af66fc99e Initial load duke parents: diff changeset	3781 } else {
a61af66fc99e Initial load duke parents: diff changeset	3782 rpo_list.push(m);
a61af66fc99e Initial load duke parents: diff changeset	3783 stk.pop();
a61af66fc99e Initial load duke parents: diff changeset	3784 }
a61af66fc99e Initial load duke parents: diff changeset	3785 }
a61af66fc99e Initial load duke parents: diff changeset	3786 }
a61af66fc99e Initial load duke parents: diff changeset	3787 #endif
a61af66fc99e Initial load duke parents: diff changeset	3788
a61af66fc99e Initial load duke parents: diff changeset	3789
a61af66fc99e Initial load duke parents: diff changeset	3790 //=============================================================================
a61af66fc99e Initial load duke parents: diff changeset	3791 //------------------------------LoopTreeIterator-----------------------------------
a61af66fc99e Initial load duke parents: diff changeset	3792
a61af66fc99e Initial load duke parents: diff changeset	3793 // Advance to next loop tree using a preorder, left-to-right traversal.
a61af66fc99e Initial load duke parents: diff changeset	3794 void LoopTreeIterator::next() {
a61af66fc99e Initial load duke parents: diff changeset	3795 assert(!done(), "must not be done.");
a61af66fc99e Initial load duke parents: diff changeset	3796 if (_curnt->_child != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	3797 _curnt = _curnt->_child;
a61af66fc99e Initial load duke parents: diff changeset	3798 } else if (_curnt->_next != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	3799 _curnt = _curnt->_next;
a61af66fc99e Initial load duke parents: diff changeset	3800 } else {
a61af66fc99e Initial load duke parents: diff changeset	3801 while (_curnt != _root && _curnt->_next == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	3802 _curnt = _curnt->_parent;
a61af66fc99e Initial load duke parents: diff changeset	3803 }
a61af66fc99e Initial load duke parents: diff changeset	3804 if (_curnt == _root) {
a61af66fc99e Initial load duke parents: diff changeset	3805 _curnt = NULL;
a61af66fc99e Initial load duke parents: diff changeset	3806 assert(done(), "must be done.");
a61af66fc99e Initial load duke parents: diff changeset	3807 } else {
a61af66fc99e Initial load duke parents: diff changeset	3808 assert(_curnt->_next != NULL, "must be more to do");
a61af66fc99e Initial load duke parents: diff changeset	3809 _curnt = _curnt->_next;
a61af66fc99e Initial load duke parents: diff changeset	3810 }
a61af66fc99e Initial load duke parents: diff changeset	3811 }
a61af66fc99e Initial load duke parents: diff changeset	3812 }

Mercurial > hg > graal-jvmci-8

annotate src/share/vm/opto/loopnode.cpp @ 23484:501f014415d8