Mercurial > hg > truffle
annotate src/share/vm/opto/loopnode.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
---|---|
date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 3213ba4d3dff |
children | cd3c534f8f4a |
rev | line source |
---|---|
0 | 1 /* |
10405 | 2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciMethodData.hpp" | |
27 #include "compiler/compileLog.hpp" | |
28 #include "libadt/vectset.hpp" | |
29 #include "memory/allocation.inline.hpp" | |
30 #include "opto/addnode.hpp" | |
31 #include "opto/callnode.hpp" | |
32 #include "opto/connode.hpp" | |
33 #include "opto/divnode.hpp" | |
34 #include "opto/idealGraphPrinter.hpp" | |
35 #include "opto/loopnode.hpp" | |
36 #include "opto/mulnode.hpp" | |
37 #include "opto/rootnode.hpp" | |
38 #include "opto/superword.hpp" | |
0 | 39 |
40 //============================================================================= | |
41 //------------------------------is_loop_iv------------------------------------- | |
42 // Determine if a node is Counted loop induction variable. | |
43 // The method is declared in node.hpp. | |
44 const Node* Node::is_loop_iv() const { | |
45 if (this->is_Phi() && !this->as_Phi()->is_copy() && | |
46 this->as_Phi()->region()->is_CountedLoop() && | |
47 this->as_Phi()->region()->as_CountedLoop()->phi() == this) { | |
48 return this; | |
49 } else { | |
50 return NULL; | |
51 } | |
52 } | |
53 | |
54 //============================================================================= | |
55 //------------------------------dump_spec-------------------------------------- | |
56 // Dump special per-node info | |
57 #ifndef PRODUCT | |
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 | 62 } |
63 #endif | |
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 | 85 //------------------------------get_early_ctrl--------------------------------- |
86 // Compute earliest legal control | |
87 Node *PhaseIdealLoop::get_early_ctrl( Node *n ) { | |
88 assert( !n->is_Phi() && !n->is_CFG(), "this code only handles data nodes" ); | |
89 uint i; | |
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 | 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 | 94 early = get_ctrl(early); // So treat input as a straight data input |
95 i = 1; | |
96 } else { | |
97 early = get_ctrl(n->in(1)); | |
98 i = 2; | |
99 } | |
100 uint e_d = dom_depth(early); | |
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 | 103 Node *cin = get_ctrl(n->in(i)); |
104 assert( cin, "" ); | |
105 // Keep deepest dominator depth | |
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 | 108 early = cin; // Keep deepest found so far |
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 | 112 // If same depth but not equal, one _must_ dominate the other |
113 // and we want the deeper (i.e., dominated) guy. | |
114 Node *n1 = early; | |
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 | 117 n1 = idom(n1); // Walk up until break cycle |
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 | 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 | 124 early = cin; // cin is deeper; keep him |
125 break; | |
126 } | |
127 } | |
128 e_d = dom_depth(early); // Reset depth register cache | |
129 } | |
130 } | |
131 | |
132 // Return earliest legal location | |
133 assert(early == find_non_split_ctrl(early), "unexpected early control"); | |
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 | 140 return early; |
141 } | |
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 | 237 //------------------------------set_early_ctrl--------------------------------- |
238 // Set earliest legal control | |
239 void PhaseIdealLoop::set_early_ctrl( Node *n ) { | |
240 Node *early = get_early_ctrl(n); | |
241 | |
242 // Record earliest legal location | |
243 set_ctrl(n, early); | |
244 } | |
245 | |
246 //------------------------------set_subtree_ctrl------------------------------- | |
247 // set missing _ctrl entries on new nodes | |
248 void PhaseIdealLoop::set_subtree_ctrl( Node *n ) { | |
249 // Already set? Get out. | |
250 if( _nodes[n->_idx] ) return; | |
251 // Recursively set _nodes array to indicate where the Node goes | |
252 uint i; | |
253 for( i = 0; i < n->req(); ++i ) { | |
254 Node *m = n->in(i); | |
255 if( m && m != C->root() ) | |
256 set_subtree_ctrl( m ); | |
257 } | |
258 | |
259 // Fixup self | |
260 set_early_ctrl( n ); | |
261 } | |
262 | |
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 | 265 PhaseGVN *gvn = &_igvn; |
266 | |
267 // Counted loop head must be a good RegionNode with only 3 not NULL | |
268 // control input edges: Self, Entry, LoopBack. | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
269 if (x->in(LoopNode::Self) == NULL || x->req() != 3) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
270 return false; |
0 | 271 |
272 Node *init_control = x->in(LoopNode::EntryControl); | |
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 | 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 | 279 |
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 | 282 back_control = back_control->in(TypeFunc::Control); |
283 | |
284 // Controlling test for loop | |
285 Node *iftrue = back_control; | |
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 | 289 // I have a weird back-control. Probably the loop-exit test is in |
290 // the middle of the loop and I am looking at some trailing control-flow | |
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 | 293 |
294 // Get boolean guarding loop-back test | |
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 | 298 BoolNode *test = iff->in(1)->as_Bool(); |
299 BoolTest::mask bt = test->_test._test; | |
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 | 302 bt = BoolTest(bt).negate(); |
303 cl_prob = 1.0 - cl_prob; | |
304 } | |
305 // Get backedge compare | |
306 Node *cmp = test->in(1); | |
307 int cmp_op = cmp->Opcode(); | |
3345 | 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 | 310 |
311 // Find the trip-counter increment & limit. Limit must be loop invariant. | |
312 Node *incr = cmp->in(1); | |
313 Node *limit = cmp->in(2); | |
314 | |
315 // --------- | |
316 // need 'loop()' test to tell if limit is loop invariant | |
317 // --------- | |
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 | 321 incr = limit; |
322 limit = tmp; | |
323 bt = BoolTest(bt).commute(); // And commute the exit test | |
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 | 329 |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
330 Node* phi_incr = NULL; |
0 | 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 | 339 } |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
340 |
0 | 341 Node* trunc1 = NULL; |
342 Node* trunc2 = NULL; | |
343 const TypeInt* iv_trunc_t = NULL; | |
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 | 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 | 348 |
349 // Get merge point | |
350 Node *xphi = incr->in(1); | |
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 | 355 Node *tmp = xphi; // 'incr' is commutative, so ok to swap |
356 xphi = stride; | |
357 stride = tmp; | |
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 | 361 if (stride_con == 0) |
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 | 368 PhiNode *phi = xphi->as_Phi(); |
369 | |
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 | 376 } |
377 Node *init_trip = phi->in(LoopNode::EntryControl); | |
378 | |
379 // If iv trunc type is smaller than int, check for possible wrap. | |
380 if (!TypeInt::INT->higher_equal(iv_trunc_t)) { | |
381 assert(trunc1 != NULL, "must have found some truncation"); | |
382 | |
383 // Get a better type for the phi (filtered thru if's) | |
384 const TypeInt* phi_ft = filtered_type(phi); | |
385 | |
386 // Can iv take on a value that will wrap? | |
387 // | |
388 // Ensure iv's limit is not within "stride" of the wrap value. | |
389 // | |
390 // Example for "short" type | |
391 // Truncation ensures value is in the range -32768..32767 (iv_trunc_t) | |
392 // If the stride is +10, then the last value of the induction | |
393 // variable before the increment (phi_ft->_hi) must be | |
394 // <= 32767 - 10 and (phi_ft->_lo) must be >= -32768 to | |
395 // ensure no truncation occurs after the increment. | |
396 | |
397 if (stride_con > 0) { | |
398 if (iv_trunc_t->_hi - phi_ft->_hi < stride_con || | |
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 | 401 } |
402 } else if (stride_con < 0) { | |
403 if (iv_trunc_t->_lo - phi_ft->_lo > stride_con || | |
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 | 406 } |
407 } | |
408 // No possibility of wrap so truncation can be discarded | |
409 // Promote iv type to Int | |
410 } else { | |
411 assert(trunc1 == NULL && trunc2 == NULL, "no truncation for int"); | |
412 } | |
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 | 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 | 430 jlong init_p = (jlong)init_t->_lo + stride_con; |
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 | 434 jlong init_p = (jlong)init_t->_hi + stride_con; |
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 |
0 | 439 // ================================================= |
440 // ---- SUCCESS! Found A Trip-Counted Loop! ----- | |
441 // | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
442 assert(x->Opcode() == Op_Loop, "regular loops only"); |
10405 | 443 C->print_method(PHASE_BEFORE_CLOOPS, 3); |
3345 | 444 |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
445 Node *hook = new (C) Node(6); |
3345 | 446 |
447 if (LoopLimitCheck) { | |
448 | |
449 // =================================================== | |
450 // Generate loop limit check to avoid integer overflow | |
451 // in cases like next (cyclic loops): | |
452 // | |
453 // for (i=0; i <= max_jint; i++) {} | |
454 // for (i=0; i < max_jint; i+=2) {} | |
455 // | |
456 // | |
457 // Limit check predicate depends on the loop test: | |
458 // | |
459 // for(;i != limit; i++) --> limit <= (max_jint) | |
460 // for(;i < limit; i+=stride) --> limit <= (max_jint - stride + 1) | |
461 // for(;i <= limit; i+=stride) --> limit <= (max_jint - stride ) | |
462 // | |
463 | |
464 // Check if limit is excluded to do more precise int overflow check. | |
465 bool incl_limit = (bt == BoolTest::le || bt == BoolTest::ge); | |
466 int stride_m = stride_con - (incl_limit ? 0 : (stride_con > 0 ? 1 : -1)); | |
467 | |
468 // If compare points directly to the phi we need to adjust | |
469 // the compare so that it points to the incr. Limit have | |
470 // to be adjusted to keep trip count the same and the | |
471 // adjusted limit should be checked for int overflow. | |
472 if (phi_incr != NULL) { | |
473 stride_m += stride_con; | |
474 } | |
475 | |
476 if (limit->is_Con()) { | |
477 int limit_con = limit->get_int(); | |
478 if ((stride_con > 0 && limit_con > (max_jint - stride_m)) || | |
479 (stride_con < 0 && limit_con < (min_jint - stride_m))) { | |
480 // Bailout: it could be integer overflow. | |
481 return false; | |
482 } | |
483 } else if ((stride_con > 0 && limit_t->_hi <= (max_jint - stride_m)) || | |
484 (stride_con < 0 && limit_t->_lo >= (min_jint - stride_m))) { | |
485 // Limit's type may satisfy the condition, for example, | |
486 // when it is an array length. | |
487 } else { | |
488 // Generate loop's limit check. | |
489 // Loop limit check predicate should be near the loop. | |
490 ProjNode *limit_check_proj = find_predicate_insertion_point(init_control, Deoptimization::Reason_loop_limit_check); | |
491 if (!limit_check_proj) { | |
492 // The limit check predicate is not generated if this method trapped here before. | |
493 #ifdef ASSERT | |
494 if (TraceLoopLimitCheck) { | |
495 tty->print("missing loop limit check:"); | |
496 loop->dump_head(); | |
497 x->dump(1); | |
498 } | |
499 #endif | |
500 return false; | |
501 } | |
502 | |
503 IfNode* check_iff = limit_check_proj->in(0)->as_If(); | |
504 Node* cmp_limit; | |
505 Node* bol; | |
506 | |
507 if (stride_con > 0) { | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
508 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
|
509 bol = new (C) BoolNode(cmp_limit, BoolTest::le); |
3345 | 510 } else { |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
511 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
|
512 bol = new (C) BoolNode(cmp_limit, BoolTest::ge); |
3345 | 513 } |
514 cmp_limit = _igvn.register_new_node_with_optimizer(cmp_limit); | |
515 bol = _igvn.register_new_node_with_optimizer(bol); | |
516 set_subtree_ctrl(bol); | |
517 | |
518 // Replace condition in original predicate but preserve Opaque node | |
519 // so that previous predicates could be found. | |
520 assert(check_iff->in(1)->Opcode() == Op_Conv2B && | |
521 check_iff->in(1)->in(1)->Opcode() == Op_Opaque1, ""); | |
522 Node* opq = check_iff->in(1)->in(1); | |
523 _igvn.hash_delete(opq); | |
524 opq->set_req(1, bol); | |
525 // Update ctrl. | |
526 set_ctrl(opq, check_iff->in(0)); | |
527 set_ctrl(check_iff->in(1), check_iff->in(0)); | |
528 | |
2445 | 529 #ifndef PRODUCT |
3345 | 530 // report that the loop predication has been actually performed |
531 // for this loop | |
532 if (TraceLoopLimitCheck) { | |
533 tty->print_cr("Counted Loop Limit Check generated:"); | |
534 debug_only( bol->dump(2); ) | |
535 } | |
536 #endif | |
537 } | |
538 | |
539 if (phi_incr != NULL) { | |
540 // If compare points directly to the phi we need to adjust | |
541 // the compare so that it points to the incr. Limit have | |
542 // to be adjusted to keep trip count the same and we | |
543 // should avoid int overflow. | |
544 // | |
545 // i = init; do {} while(i++ < limit); | |
546 // is converted to | |
547 // i = init; do {} while(++i < limit+1); | |
548 // | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
549 limit = gvn->transform(new (C) AddINode(limit, stride)); |
2445 | 550 } |
3345 | 551 |
552 // Now we need to canonicalize loop condition. | |
553 if (bt == BoolTest::ne) { | |
554 assert(stride_con == 1 || stride_con == -1, "simple increment only"); | |
3782 | 555 // 'ne' can be replaced with 'lt' only when init < limit. |
556 if (stride_con > 0 && init_t->_hi < limit_t->_lo) | |
557 bt = BoolTest::lt; | |
558 // 'ne' can be replaced with 'gt' only when init > limit. | |
559 if (stride_con < 0 && init_t->_lo > limit_t->_hi) | |
560 bt = BoolTest::gt; | |
3345 | 561 } |
562 | |
563 if (incl_limit) { | |
564 // The limit check guaranties that 'limit <= (max_jint - stride)' so | |
565 // we can convert 'i <= limit' to 'i < limit+1' since stride != 0. | |
566 // | |
567 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
|
568 limit = gvn->transform(new (C) AddINode(limit, one)); |
3345 | 569 if (bt == BoolTest::le) |
570 bt = BoolTest::lt; | |
571 else if (bt == BoolTest::ge) | |
572 bt = BoolTest::gt; | |
573 else | |
574 ShouldNotReachHere(); | |
575 } | |
576 set_subtree_ctrl( limit ); | |
577 | |
578 } else { // LoopLimitCheck | |
579 | |
0 | 580 // If compare points to incr, we are ok. Otherwise the compare |
581 // can directly point to the phi; in this case adjust the compare so that | |
605 | 582 // 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
|
583 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
|
584 limit = gvn->transform(new (C) AddINode(limit,stride)); |
0 | 585 |
586 // trip-count for +-tive stride should be: (limit - init_trip + stride - 1)/stride. | |
587 // Final value for iterator should be: trip_count * stride + init_trip. | |
588 Node *one_p = gvn->intcon( 1); | |
589 Node *one_m = gvn->intcon(-1); | |
590 | |
591 Node *trip_count = NULL; | |
592 switch( bt ) { | |
593 case BoolTest::eq: | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
594 ShouldNotReachHere(); |
0 | 595 case BoolTest::ne: // Ahh, the case we desire |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
596 if (stride_con == 1) |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
597 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
|
598 else if (stride_con == -1) |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
599 trip_count = gvn->transform(new (C) SubINode(init_trip,limit)); |
0 | 600 else |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
601 ShouldNotReachHere(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
602 set_subtree_ctrl(trip_count); |
0 | 603 //_loop.map(trip_count->_idx,loop(limit)); |
604 break; | |
605 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
|
606 limit = gvn->transform(new (C) AddINode(limit,one_p)); |
0 | 607 set_subtree_ctrl( limit ); |
608 hook->init_req(4, limit); | |
609 | |
610 bt = BoolTest::lt; | |
611 // Make the new limit be in the same loop nest as the old limit | |
612 //_loop.map(limit->_idx,limit_loop); | |
613 // Fall into next case | |
614 case BoolTest::lt: { // Maybe convert to '!=' case | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
615 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
|
616 ShouldNotReachHere(); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
617 Node *range = gvn->transform(new (C) SubINode(limit,init_trip)); |
0 | 618 set_subtree_ctrl( range ); |
619 hook->init_req(0, range); | |
620 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
621 Node *bias = gvn->transform(new (C) AddINode(range,stride)); |
0 | 622 set_subtree_ctrl( bias ); |
623 hook->init_req(1, bias); | |
624 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
625 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_m)); |
0 | 626 set_subtree_ctrl( bias1 ); |
627 hook->init_req(2, bias1); | |
628 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
629 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride)); |
0 | 630 set_subtree_ctrl( trip_count ); |
631 hook->init_req(3, trip_count); | |
632 break; | |
633 } | |
634 | |
635 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
|
636 limit = gvn->transform(new (C) AddINode(limit,one_m)); |
0 | 637 set_subtree_ctrl( limit ); |
638 hook->init_req(4 ,limit); | |
639 | |
640 bt = BoolTest::gt; | |
641 // Make the new limit be in the same loop nest as the old limit | |
642 //_loop.map(limit->_idx,limit_loop); | |
643 // Fall into next case | |
644 case BoolTest::gt: { // Maybe convert to '!=' case | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
645 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
|
646 ShouldNotReachHere(); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
647 Node *range = gvn->transform(new (C) SubINode(limit,init_trip)); |
0 | 648 set_subtree_ctrl( range ); |
649 hook->init_req(0, range); | |
650 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
651 Node *bias = gvn->transform(new (C) AddINode(range,stride)); |
0 | 652 set_subtree_ctrl( bias ); |
653 hook->init_req(1, bias); | |
654 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
655 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_p)); |
0 | 656 set_subtree_ctrl( bias1 ); |
657 hook->init_req(2, bias1); | |
658 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
659 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride)); |
0 | 660 set_subtree_ctrl( trip_count ); |
661 hook->init_req(3, trip_count); | |
662 break; | |
663 } | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
664 } // switch( bt ) |
0 | 665 |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
666 Node *span = gvn->transform(new (C) MulINode(trip_count,stride)); |
0 | 667 set_subtree_ctrl( span ); |
668 hook->init_req(5, span); | |
669 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
670 limit = gvn->transform(new (C) AddINode(span,init_trip)); |
0 | 671 set_subtree_ctrl( limit ); |
672 | |
3345 | 673 } // LoopLimitCheck |
674 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
675 // Check for SafePoint on backedge and remove |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
676 Node *sfpt = x->in(LoopNode::LoopBackControl); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
677 if (sfpt->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt)) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
678 lazy_replace( sfpt, iftrue ); |
6636 | 679 if (loop->_safepts != NULL) { |
680 loop->_safepts->yank(sfpt); | |
681 } | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
682 loop->_tail = iftrue; |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
683 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
684 |
0 | 685 // Build a canonical trip test. |
686 // Clone code, as old values may be in use. | |
687 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
|
688 incr->set_req(1,phi); |
0 | 689 incr->set_req(2,stride); |
690 incr = _igvn.register_new_node_with_optimizer(incr); | |
691 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
|
692 _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
|
693 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
|
694 |
2c24ef16533d
7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64
kvn
parents:
3850
diff
changeset
|
695 // 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
|
696 // 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
|
697 // 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
|
698 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
|
699 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
|
700 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
|
701 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
|
702 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
|
703 _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
|
704 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
|
705 } |
0 | 706 cmp = cmp->clone(); |
707 cmp->set_req(1,incr); | |
708 cmp->set_req(2,limit); | |
709 cmp = _igvn.register_new_node_with_optimizer(cmp); | |
710 set_ctrl(cmp, iff->in(0)); | |
711 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
712 test = test->clone()->as_Bool(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
713 (*(BoolTest*)&test->_test)._test = bt; |
0 | 714 test->set_req(1,cmp); |
715 _igvn.register_new_node_with_optimizer(test); | |
716 set_ctrl(test, iff->in(0)); | |
717 | |
718 // 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
|
719 Node *lex = _igvn.register_new_node_with_optimizer(new (C) CountedLoopEndNode( iff->in(0), test, cl_prob, iff->as_If()->_fcnt )); |
0 | 720 IfNode *le = lex->as_If(); |
721 uint dd = dom_depth(iff); | |
722 set_idom(le, le->in(0), dd); // Update dominance for loop exit | |
723 set_loop(le, loop); | |
724 | |
725 // Get the loop-exit control | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
726 Node *iffalse = iff->as_If()->proj_out(!(iftrue_op == Op_IfTrue)); |
0 | 727 |
728 // 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
|
729 if (iftrue_op == Op_IfFalse) { |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
730 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
|
731 Node *iff2=_igvn.register_new_node_with_optimizer(new (C) IfFalseNode(le)); |
0 | 732 |
733 loop->_tail = back_control = ift2; | |
734 set_loop(ift2, loop); | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
735 set_loop(iff2, get_loop(iffalse)); |
0 | 736 |
737 // Lazy update of 'get_ctrl' mechanism. | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
738 lazy_replace_proj( iffalse, iff2 ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
739 lazy_replace_proj( iftrue, ift2 ); |
0 | 740 |
741 // Swap names | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
742 iffalse = iff2; |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
743 iftrue = ift2; |
0 | 744 } else { |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
745 _igvn.hash_delete(iffalse); |
0 | 746 _igvn.hash_delete(iftrue); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
747 iffalse->set_req_X( 0, le, &_igvn ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
748 iftrue ->set_req_X( 0, le, &_igvn ); |
0 | 749 } |
750 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
751 set_idom(iftrue, le, dd+1); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
752 set_idom(iffalse, le, dd+1); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
753 assert(iff->outcnt() == 0, "should be dead now"); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
754 lazy_replace( iff, le ); // fix 'get_ctrl' |
0 | 755 |
756 // 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
|
757 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
|
758 l->set_unswitch_count(x->as_Loop()->unswitch_count()); // Preserve |
0 | 759 // The following assert is approximately true, and defines the intention |
760 // of can_be_counted_loop. It fails, however, because phase->type | |
761 // is not yet initialized for this loop and its parts. | |
762 //assert(l->can_be_counted_loop(this), "sanity"); | |
763 _igvn.register_new_node_with_optimizer(l); | |
764 set_loop(l, loop); | |
765 loop->_head = l; | |
766 // Fix all data nodes placed at the old loop head. | |
767 // Uses the lazy-update mechanism of 'get_ctrl'. | |
768 lazy_replace( x, l ); | |
769 set_idom(l, init_control, dom_depth(x)); | |
770 | |
605 | 771 // Check for immediately preceding SafePoint and remove |
0 | 772 Node *sfpt2 = le->in(0); |
6636 | 773 if (sfpt2->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt2)) { |
0 | 774 lazy_replace( sfpt2, sfpt2->in(TypeFunc::Control)); |
6636 | 775 if (loop->_safepts != NULL) { |
776 loop->_safepts->yank(sfpt2); | |
777 } | |
778 } | |
0 | 779 |
780 // Free up intermediate goo | |
781 _igvn.remove_dead_node(hook); | |
782 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
783 #ifdef ASSERT |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
784 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
|
785 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
|
786 #endif |
3345 | 787 #ifndef PRODUCT |
788 if (TraceLoopOpts) { | |
789 tty->print("Counted "); | |
790 loop->dump_head(); | |
791 } | |
792 #endif | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
793 |
10405 | 794 C->print_method(PHASE_AFTER_CLOOPS, 3); |
0 | 795 |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
796 return true; |
0 | 797 } |
798 | |
3345 | 799 //----------------------exact_limit------------------------------------------- |
800 Node* PhaseIdealLoop::exact_limit( IdealLoopTree *loop ) { | |
801 assert(loop->_head->is_CountedLoop(), ""); | |
802 CountedLoopNode *cl = loop->_head->as_CountedLoop(); | |
3850
6987871cfb9b
7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents:
3845
diff
changeset
|
803 assert(cl->is_valid_counted_loop(), ""); |
3345 | 804 |
805 if (!LoopLimitCheck || ABS(cl->stride_con()) == 1 || | |
806 cl->limit()->Opcode() == Op_LoopLimit) { | |
807 // Old code has exact limit (it could be incorrect in case of int overflow). | |
808 // Loop limit is exact with stride == 1. And loop may already have exact limit. | |
809 return cl->limit(); | |
810 } | |
811 Node *limit = NULL; | |
812 #ifdef ASSERT | |
813 BoolTest::mask bt = cl->loopexit()->test_trip(); | |
814 assert(bt == BoolTest::lt || bt == BoolTest::gt, "canonical test is expected"); | |
815 #endif | |
816 if (cl->has_exact_trip_count()) { | |
817 // Simple case: loop has constant boundaries. | |
6846 | 818 // Use jlongs to avoid integer overflow. |
3345 | 819 int stride_con = cl->stride_con(); |
6846 | 820 jlong init_con = cl->init_trip()->get_int(); |
821 jlong limit_con = cl->limit()->get_int(); | |
3345 | 822 julong trip_cnt = cl->trip_count(); |
6846 | 823 jlong final_con = init_con + trip_cnt*stride_con; |
3345 | 824 int final_int = (int)final_con; |
825 // The final value should be in integer range since the loop | |
826 // is counted and the limit was checked for overflow. | |
6846 | 827 assert(final_con == (jlong)final_int, "final value should be integer"); |
3345 | 828 limit = _igvn.intcon(final_int); |
829 } else { | |
830 // 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
|
831 limit = new (C) LoopLimitNode(C, cl->init_trip(), cl->limit(), cl->stride()); |
3345 | 832 register_new_node(limit, cl->in(LoopNode::EntryControl)); |
833 } | |
834 assert(limit != NULL, "sanity"); | |
835 return limit; | |
836 } | |
0 | 837 |
838 //------------------------------Ideal------------------------------------------ | |
839 // Return a node which is more "ideal" than the current node. | |
840 // Attempt to convert into a counted-loop. | |
841 Node *LoopNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
842 if (!can_be_counted_loop(phase)) { | |
843 phase->C->set_major_progress(); | |
844 } | |
845 return RegionNode::Ideal(phase, can_reshape); | |
846 } | |
847 | |
848 | |
849 //============================================================================= | |
850 //------------------------------Ideal------------------------------------------ | |
851 // Return a node which is more "ideal" than the current node. | |
852 // Attempt to convert into a counted-loop. | |
853 Node *CountedLoopNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
854 return RegionNode::Ideal(phase, can_reshape); | |
855 } | |
856 | |
857 //------------------------------dump_spec-------------------------------------- | |
858 // Dump special per-node info | |
859 #ifndef PRODUCT | |
860 void CountedLoopNode::dump_spec(outputStream *st) const { | |
861 LoopNode::dump_spec(st); | |
3345 | 862 if (stride_is_con()) { |
0 | 863 st->print("stride: %d ",stride_con()); |
864 } | |
3345 | 865 if (is_pre_loop ()) st->print("pre of N%d" , _main_idx); |
866 if (is_main_loop()) st->print("main of N%d", _idx); | |
867 if (is_post_loop()) st->print("post of N%d", _main_idx); | |
0 | 868 } |
869 #endif | |
870 | |
871 //============================================================================= | |
872 int CountedLoopEndNode::stride_con() const { | |
873 return stride()->bottom_type()->is_int()->get_con(); | |
874 } | |
875 | |
3345 | 876 //============================================================================= |
877 //------------------------------Value----------------------------------------- | |
878 const Type *LoopLimitNode::Value( PhaseTransform *phase ) const { | |
879 const Type* init_t = phase->type(in(Init)); | |
880 const Type* limit_t = phase->type(in(Limit)); | |
881 const Type* stride_t = phase->type(in(Stride)); | |
882 // Either input is TOP ==> the result is TOP | |
883 if (init_t == Type::TOP) return Type::TOP; | |
884 if (limit_t == Type::TOP) return Type::TOP; | |
885 if (stride_t == Type::TOP) return Type::TOP; | |
886 | |
887 int stride_con = stride_t->is_int()->get_con(); | |
888 if (stride_con == 1) | |
889 return NULL; // Identity | |
890 | |
891 if (init_t->is_int()->is_con() && limit_t->is_int()->is_con()) { | |
6846 | 892 // Use jlongs to avoid integer overflow. |
893 jlong init_con = init_t->is_int()->get_con(); | |
894 jlong limit_con = limit_t->is_int()->get_con(); | |
3345 | 895 int stride_m = stride_con - (stride_con > 0 ? 1 : -1); |
6846 | 896 jlong trip_count = (limit_con - init_con + stride_m)/stride_con; |
897 jlong final_con = init_con + stride_con*trip_count; | |
3345 | 898 int final_int = (int)final_con; |
899 // The final value should be in integer range since the loop | |
900 // is counted and the limit was checked for overflow. | |
6846 | 901 assert(final_con == (jlong)final_int, "final value should be integer"); |
3345 | 902 return TypeInt::make(final_int); |
903 } | |
904 | |
905 return bottom_type(); // TypeInt::INT | |
906 } | |
907 | |
908 //------------------------------Ideal------------------------------------------ | |
909 // Return a node which is more "ideal" than the current node. | |
910 Node *LoopLimitNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
911 if (phase->type(in(Init)) == Type::TOP || | |
912 phase->type(in(Limit)) == Type::TOP || | |
913 phase->type(in(Stride)) == Type::TOP) | |
914 return NULL; // Dead | |
915 | |
916 int stride_con = phase->type(in(Stride))->is_int()->get_con(); | |
917 if (stride_con == 1) | |
918 return NULL; // Identity | |
919 | |
920 if (in(Init)->is_Con() && in(Limit)->is_Con()) | |
921 return NULL; // Value | |
922 | |
923 // Delay following optimizations until all loop optimizations | |
924 // done to keep Ideal graph simple. | |
925 if (!can_reshape || phase->C->major_progress()) | |
926 return NULL; | |
927 | |
928 const TypeInt* init_t = phase->type(in(Init) )->is_int(); | |
929 const TypeInt* limit_t = phase->type(in(Limit))->is_int(); | |
930 int stride_p; | |
6846 | 931 jlong lim, ini; |
3345 | 932 julong max; |
933 if (stride_con > 0) { | |
934 stride_p = stride_con; | |
935 lim = limit_t->_hi; | |
936 ini = init_t->_lo; | |
937 max = (julong)max_jint; | |
938 } else { | |
939 stride_p = -stride_con; | |
940 lim = init_t->_hi; | |
941 ini = limit_t->_lo; | |
942 max = (julong)min_jint; | |
943 } | |
944 julong range = lim - ini + stride_p; | |
945 if (range <= max) { | |
946 // Convert to integer expression if it is not overflow. | |
947 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
|
948 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
|
949 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
|
950 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
|
951 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
|
952 return new (phase->C) AddINode(span, in(Init)); // exact limit |
3345 | 953 } |
954 | |
955 if (is_power_of_2(stride_p) || // divisor is 2^n | |
956 !Matcher::has_match_rule(Op_LoopLimit)) { // or no specialized Mach node? | |
957 // Convert to long expression to avoid integer overflow | |
958 // and let igvn optimizer convert this division. | |
959 // | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
960 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
|
961 Node* limit = phase->transform( new (phase->C) ConvI2LNode(in(Limit))); |
3345 | 962 Node* stride = phase->longcon(stride_con); |
963 Node* stride_m = phase->longcon(stride_con - (stride_con > 0 ? 1 : -1)); | |
964 | |
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) SubLNode(limit, 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) AddLNode(range, stride_m)); |
3345 | 967 Node *span; |
968 if (stride_con > 0 && is_power_of_2(stride_p)) { | |
969 // bias >= 0 if stride >0, so if stride is 2^n we can use &(-stride) | |
970 // and avoid generating rounding for division. Zero trip guard should | |
971 // guarantee that init < limit but sometimes the guard is missing and | |
972 // we can get situation when init > limit. Note, for the empty loop | |
973 // optimization zero trip guard is generated explicitly which leaves | |
974 // only RCE predicate where exact limit is used and the predicate | |
975 // will simply fail forcing recompilation. | |
976 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
|
977 span = phase->transform(new (phase->C) AndLNode(bias, neg_stride)); |
3345 | 978 } else { |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
979 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
|
980 span = phase->transform(new (phase->C) MulLNode(trip, stride)); |
3345 | 981 } |
982 // Convert back to int | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
983 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
|
984 return new (phase->C) AddINode(span_int, in(Init)); // exact limit |
3345 | 985 } |
986 | |
987 return NULL; // No progress | |
988 } | |
989 | |
990 //------------------------------Identity--------------------------------------- | |
991 // If stride == 1 return limit node. | |
992 Node *LoopLimitNode::Identity( PhaseTransform *phase ) { | |
993 int stride_con = phase->type(in(Stride))->is_int()->get_con(); | |
994 if (stride_con == 1 || stride_con == -1) | |
995 return in(Limit); | |
996 return this; | |
997 } | |
998 | |
999 //============================================================================= | |
0 | 1000 //----------------------match_incr_with_optional_truncation-------------------- |
1001 // Match increment with optional truncation: | |
1002 // CHAR: (i+1)&0x7fff, BYTE: ((i+1)<<8)>>8, or SHORT: ((i+1)<<16)>>16 | |
1003 // Return NULL for failure. Success returns the increment node. | |
1004 Node* CountedLoopNode::match_incr_with_optional_truncation( | |
1005 Node* expr, Node** trunc1, Node** trunc2, const TypeInt** trunc_type) { | |
1006 // Quick cutouts: | |
4862
f457154eee8b
7140882: Don't return booleans from methods returning pointers
brutisso
parents:
4779
diff
changeset
|
1007 if (expr == NULL || expr->req() != 3) return NULL; |
0 | 1008 |
1009 Node *t1 = NULL; | |
1010 Node *t2 = NULL; | |
1011 const TypeInt* trunc_t = TypeInt::INT; | |
1012 Node* n1 = expr; | |
1013 int n1op = n1->Opcode(); | |
1014 | |
1015 // Try to strip (n1 & M) or (n1 << N >> N) from n1. | |
1016 if (n1op == Op_AndI && | |
1017 n1->in(2)->is_Con() && | |
1018 n1->in(2)->bottom_type()->is_int()->get_con() == 0x7fff) { | |
1019 // %%% This check should match any mask of 2**K-1. | |
1020 t1 = n1; | |
1021 n1 = t1->in(1); | |
1022 n1op = n1->Opcode(); | |
1023 trunc_t = TypeInt::CHAR; | |
1024 } else if (n1op == Op_RShiftI && | |
1025 n1->in(1) != NULL && | |
1026 n1->in(1)->Opcode() == Op_LShiftI && | |
1027 n1->in(2) == n1->in(1)->in(2) && | |
1028 n1->in(2)->is_Con()) { | |
1029 jint shift = n1->in(2)->bottom_type()->is_int()->get_con(); | |
1030 // %%% This check should match any shift in [1..31]. | |
1031 if (shift == 16 || shift == 8) { | |
1032 t1 = n1; | |
1033 t2 = t1->in(1); | |
1034 n1 = t2->in(1); | |
1035 n1op = n1->Opcode(); | |
1036 if (shift == 16) { | |
1037 trunc_t = TypeInt::SHORT; | |
1038 } else if (shift == 8) { | |
1039 trunc_t = TypeInt::BYTE; | |
1040 } | |
1041 } | |
1042 } | |
1043 | |
1044 // If (maybe after stripping) it is an AddI, we won: | |
1045 if (n1op == Op_AddI) { | |
1046 *trunc1 = t1; | |
1047 *trunc2 = t2; | |
1048 *trunc_type = trunc_t; | |
1049 return n1; | |
1050 } | |
1051 | |
1052 // failed | |
1053 return NULL; | |
1054 } | |
1055 | |
1056 | |
1057 //------------------------------filtered_type-------------------------------- | |
1058 // Return a type based on condition control flow | |
1059 // A successful return will be a type that is restricted due | |
1060 // to a series of dominating if-tests, such as: | |
1061 // if (i < 10) { | |
1062 // if (i > 0) { | |
1063 // here: "i" type is [1..10) | |
1064 // } | |
1065 // } | |
1066 // or a control flow merge | |
1067 // if (i < 10) { | |
1068 // do { | |
1069 // phi( , ) -- at top of loop type is [min_int..10) | |
1070 // i = ? | |
1071 // } while ( i < 10) | |
1072 // | |
1073 const TypeInt* PhaseIdealLoop::filtered_type( Node *n, Node* n_ctrl) { | |
1074 assert(n && n->bottom_type()->is_int(), "must be int"); | |
1075 const TypeInt* filtered_t = NULL; | |
1076 if (!n->is_Phi()) { | |
1077 assert(n_ctrl != NULL || n_ctrl == C->top(), "valid control"); | |
1078 filtered_t = filtered_type_from_dominators(n, n_ctrl); | |
1079 | |
1080 } else { | |
1081 Node* phi = n->as_Phi(); | |
1082 Node* region = phi->in(0); | |
1083 assert(n_ctrl == NULL || n_ctrl == region, "ctrl parameter must be region"); | |
1084 if (region && region != C->top()) { | |
1085 for (uint i = 1; i < phi->req(); i++) { | |
1086 Node* val = phi->in(i); | |
1087 Node* use_c = region->in(i); | |
1088 const TypeInt* val_t = filtered_type_from_dominators(val, use_c); | |
1089 if (val_t != NULL) { | |
1090 if (filtered_t == NULL) { | |
1091 filtered_t = val_t; | |
1092 } else { | |
1093 filtered_t = filtered_t->meet(val_t)->is_int(); | |
1094 } | |
1095 } | |
1096 } | |
1097 } | |
1098 } | |
1099 const TypeInt* n_t = _igvn.type(n)->is_int(); | |
1100 if (filtered_t != NULL) { | |
1101 n_t = n_t->join(filtered_t)->is_int(); | |
1102 } | |
1103 return n_t; | |
1104 } | |
1105 | |
1106 | |
1107 //------------------------------filtered_type_from_dominators-------------------------------- | |
1108 // Return a possibly more restrictive type for val based on condition control flow of dominators | |
1109 const TypeInt* PhaseIdealLoop::filtered_type_from_dominators( Node* val, Node *use_ctrl) { | |
1110 if (val->is_Con()) { | |
1111 return val->bottom_type()->is_int(); | |
1112 } | |
1113 uint if_limit = 10; // Max number of dominating if's visited | |
1114 const TypeInt* rtn_t = NULL; | |
1115 | |
1116 if (use_ctrl && use_ctrl != C->top()) { | |
1117 Node* val_ctrl = get_ctrl(val); | |
1118 uint val_dom_depth = dom_depth(val_ctrl); | |
1119 Node* pred = use_ctrl; | |
1120 uint if_cnt = 0; | |
1121 while (if_cnt < if_limit) { | |
1122 if ((pred->Opcode() == Op_IfTrue || pred->Opcode() == Op_IfFalse)) { | |
1123 if_cnt++; | |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1124 const TypeInt* if_t = IfNode::filtered_int_type(&_igvn, val, pred); |
0 | 1125 if (if_t != NULL) { |
1126 if (rtn_t == NULL) { | |
1127 rtn_t = if_t; | |
1128 } else { | |
1129 rtn_t = rtn_t->join(if_t)->is_int(); | |
1130 } | |
1131 } | |
1132 } | |
1133 pred = idom(pred); | |
1134 if (pred == NULL || pred == C->top()) { | |
1135 break; | |
1136 } | |
1137 // Stop if going beyond definition block of val | |
1138 if (dom_depth(pred) < val_dom_depth) { | |
1139 break; | |
1140 } | |
1141 } | |
1142 } | |
1143 return rtn_t; | |
1144 } | |
1145 | |
1146 | |
1147 //------------------------------dump_spec-------------------------------------- | |
1148 // Dump special per-node info | |
1149 #ifndef PRODUCT | |
1150 void CountedLoopEndNode::dump_spec(outputStream *st) const { | |
1151 if( in(TestValue)->is_Bool() ) { | |
1152 BoolTest bt( test_trip()); // Added this for g++. | |
1153 | |
1154 st->print("["); | |
1155 bt.dump_on(st); | |
1156 st->print("]"); | |
1157 } | |
1158 st->print(" "); | |
1159 IfNode::dump_spec(st); | |
1160 } | |
1161 #endif | |
1162 | |
1163 //============================================================================= | |
1164 //------------------------------is_member-------------------------------------- | |
1165 // Is 'l' a member of 'this'? | |
1166 int IdealLoopTree::is_member( const IdealLoopTree *l ) const { | |
1167 while( l->_nest > _nest ) l = l->_parent; | |
1168 return l == this; | |
1169 } | |
1170 | |
1171 //------------------------------set_nest--------------------------------------- | |
1172 // Set loop tree nesting depth. Accumulate _has_call bits. | |
1173 int IdealLoopTree::set_nest( uint depth ) { | |
1174 _nest = depth; | |
1175 int bits = _has_call; | |
1176 if( _child ) bits |= _child->set_nest(depth+1); | |
1177 if( bits ) _has_call = 1; | |
1178 if( _next ) bits |= _next ->set_nest(depth ); | |
1179 return bits; | |
1180 } | |
1181 | |
1182 //------------------------------split_fall_in---------------------------------- | |
1183 // Split out multiple fall-in edges from the loop header. Move them to a | |
1184 // private RegionNode before the loop. This becomes the loop landing pad. | |
1185 void IdealLoopTree::split_fall_in( PhaseIdealLoop *phase, int fall_in_cnt ) { | |
1186 PhaseIterGVN &igvn = phase->_igvn; | |
1187 uint i; | |
1188 | |
1189 // 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
|
1190 Node *landing_pad = new (phase->C) RegionNode( fall_in_cnt+1 ); |
0 | 1191 phase->set_loop(landing_pad,_parent); |
1192 // Gather all the fall-in control paths into the landing pad | |
1193 uint icnt = fall_in_cnt; | |
1194 uint oreq = _head->req(); | |
1195 for( i = oreq-1; i>0; i-- ) | |
1196 if( !phase->is_member( this, _head->in(i) ) ) | |
1197 landing_pad->set_req(icnt--,_head->in(i)); | |
1198 | |
1199 // Peel off PhiNode edges as well | |
1200 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1201 Node *oj = _head->fast_out(j); | |
1202 if( oj->is_Phi() ) { | |
1203 PhiNode* old_phi = oj->as_Phi(); | |
1204 assert( old_phi->region() == _head, "" ); | |
1205 igvn.hash_delete(old_phi); // Yank from hash before hacking edges | |
1206 Node *p = PhiNode::make_blank(landing_pad, old_phi); | |
1207 uint icnt = fall_in_cnt; | |
1208 for( i = oreq-1; i>0; i-- ) { | |
1209 if( !phase->is_member( this, _head->in(i) ) ) { | |
1210 p->init_req(icnt--, old_phi->in(i)); | |
1211 // Go ahead and clean out old edges from old phi | |
1212 old_phi->del_req(i); | |
1213 } | |
1214 } | |
1215 // Search for CSE's here, because ZKM.jar does a lot of | |
1216 // loop hackery and we need to be a little incremental | |
1217 // with the CSE to avoid O(N^2) node blow-up. | |
1218 Node *p2 = igvn.hash_find_insert(p); // Look for a CSE | |
1219 if( p2 ) { // Found CSE | |
1220 p->destruct(); // Recover useless new node | |
1221 p = p2; // Use old node | |
1222 } else { | |
1223 igvn.register_new_node_with_optimizer(p, old_phi); | |
1224 } | |
1225 // Make old Phi refer to new Phi. | |
1226 old_phi->add_req(p); | |
1227 // Check for the special case of making the old phi useless and | |
1228 // disappear it. In JavaGrande I have a case where this useless | |
1229 // Phi is the loop limit and prevents recognizing a CountedLoop | |
1230 // which in turn prevents removing an empty loop. | |
1231 Node *id_old_phi = old_phi->Identity( &igvn ); | |
1232 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
|
1233 // Note that I cannot call 'replace_node' here, because |
0 | 1234 // that will yank the edge from old_phi to the Region and |
1235 // I'm mid-iteration over the Region's uses. | |
1236 for (DUIterator_Last imin, i = old_phi->last_outs(imin); i >= imin; ) { | |
1237 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
|
1238 igvn.rehash_node_delayed(use); |
0 | 1239 uint uses_found = 0; |
1240 for (uint j = 0; j < use->len(); j++) { | |
1241 if (use->in(j) == old_phi) { | |
1242 if (j < use->req()) use->set_req (j, id_old_phi); | |
1243 else use->set_prec(j, id_old_phi); | |
1244 uses_found++; | |
1245 } | |
1246 } | |
1247 i -= uses_found; // we deleted 1 or more copies of this edge | |
1248 } | |
1249 } | |
1250 igvn._worklist.push(old_phi); | |
1251 } | |
1252 } | |
1253 // Finally clean out the fall-in edges from the RegionNode | |
1254 for( i = oreq-1; i>0; i-- ) { | |
1255 if( !phase->is_member( this, _head->in(i) ) ) { | |
1256 _head->del_req(i); | |
1257 } | |
1258 } | |
1259 // Transform landing pad | |
1260 igvn.register_new_node_with_optimizer(landing_pad, _head); | |
1261 // Insert landing pad into the header | |
1262 _head->add_req(landing_pad); | |
1263 } | |
1264 | |
1265 //------------------------------split_outer_loop------------------------------- | |
1266 // Split out the outermost loop from this shared header. | |
1267 void IdealLoopTree::split_outer_loop( PhaseIdealLoop *phase ) { | |
1268 PhaseIterGVN &igvn = phase->_igvn; | |
1269 | |
1270 // Find index of outermost loop; it should also be my tail. | |
1271 uint outer_idx = 1; | |
1272 while( _head->in(outer_idx) != _tail ) outer_idx++; | |
1273 | |
1274 // Make a LoopNode for the outermost loop. | |
1275 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
|
1276 Node *outer = new (phase->C) LoopNode( ctl, _head->in(outer_idx) ); |
0 | 1277 outer = igvn.register_new_node_with_optimizer(outer, _head); |
1278 phase->set_created_loop_node(); | |
2445 | 1279 |
0 | 1280 // Outermost loop falls into '_head' loop |
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3782
diff
changeset
|
1281 _head->set_req(LoopNode::EntryControl, outer); |
0 | 1282 _head->del_req(outer_idx); |
1283 // Split all the Phis up between '_head' loop and 'outer' loop. | |
1284 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1285 Node *out = _head->fast_out(j); | |
1286 if( out->is_Phi() ) { | |
1287 PhiNode *old_phi = out->as_Phi(); | |
1288 assert( old_phi->region() == _head, "" ); | |
1289 Node *phi = PhiNode::make_blank(outer, old_phi); | |
1290 phi->init_req(LoopNode::EntryControl, old_phi->in(LoopNode::EntryControl)); | |
1291 phi->init_req(LoopNode::LoopBackControl, old_phi->in(outer_idx)); | |
1292 phi = igvn.register_new_node_with_optimizer(phi, old_phi); | |
1293 // 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
|
1294 igvn.replace_input_of(old_phi, LoopNode::EntryControl, phi); |
0 | 1295 old_phi->del_req(outer_idx); |
1296 } | |
1297 } | |
1298 | |
1299 // Use the new loop head instead of the old shared one | |
1300 _head = outer; | |
1301 phase->set_loop(_head, this); | |
1302 } | |
1303 | |
1304 //------------------------------fix_parent------------------------------------- | |
1305 static void fix_parent( IdealLoopTree *loop, IdealLoopTree *parent ) { | |
1306 loop->_parent = parent; | |
1307 if( loop->_child ) fix_parent( loop->_child, loop ); | |
1308 if( loop->_next ) fix_parent( loop->_next , parent ); | |
1309 } | |
1310 | |
1311 //------------------------------estimate_path_freq----------------------------- | |
1312 static float estimate_path_freq( Node *n ) { | |
1313 // Try to extract some path frequency info | |
1314 IfNode *iff; | |
1315 for( int i = 0; i < 50; i++ ) { // Skip through a bunch of uncommon tests | |
1316 uint nop = n->Opcode(); | |
1317 if( nop == Op_SafePoint ) { // Skip any safepoint | |
1318 n = n->in(0); | |
1319 continue; | |
1320 } | |
1321 if( nop == Op_CatchProj ) { // Get count from a prior call | |
1322 // Assume call does not always throw exceptions: means the call-site | |
1323 // count is also the frequency of the fall-through path. | |
1324 assert( n->is_CatchProj(), "" ); | |
1325 if( ((CatchProjNode*)n)->_con != CatchProjNode::fall_through_index ) | |
1326 return 0.0f; // Assume call exception path is rare | |
1327 Node *call = n->in(0)->in(0)->in(0); | |
1328 assert( call->is_Call(), "expect a call here" ); | |
1329 const JVMState *jvms = ((CallNode*)call)->jvms(); | |
1330 ciMethodData* methodData = jvms->method()->method_data(); | |
1331 if (!methodData->is_mature()) return 0.0f; // No call-site data | |
1332 ciProfileData* data = methodData->bci_to_data(jvms->bci()); | |
1333 if ((data == NULL) || !data->is_CounterData()) { | |
1334 // no call profile available, try call's control input | |
1335 n = n->in(0); | |
1336 continue; | |
1337 } | |
1338 return data->as_CounterData()->count()/FreqCountInvocations; | |
1339 } | |
1340 // See if there's a gating IF test | |
1341 Node *n_c = n->in(0); | |
1342 if( !n_c->is_If() ) break; // No estimate available | |
1343 iff = n_c->as_If(); | |
1344 if( iff->_fcnt != COUNT_UNKNOWN ) // Have a valid count? | |
1345 // Compute how much count comes on this path | |
1346 return ((nop == Op_IfTrue) ? iff->_prob : 1.0f - iff->_prob) * iff->_fcnt; | |
1347 // Have no count info. Skip dull uncommon-trap like branches. | |
1348 if( (nop == Op_IfTrue && iff->_prob < PROB_LIKELY_MAG(5)) || | |
1349 (nop == Op_IfFalse && iff->_prob > PROB_UNLIKELY_MAG(5)) ) | |
1350 break; | |
1351 // Skip through never-taken branch; look for a real loop exit. | |
1352 n = iff->in(0); | |
1353 } | |
1354 return 0.0f; // No estimate available | |
1355 } | |
1356 | |
1357 //------------------------------merge_many_backedges--------------------------- | |
1358 // Merge all the backedges from the shared header into a private Region. | |
1359 // Feed that region as the one backedge to this loop. | |
1360 void IdealLoopTree::merge_many_backedges( PhaseIdealLoop *phase ) { | |
1361 uint i; | |
1362 | |
1363 // Scan for the top 2 hottest backedges | |
1364 float hotcnt = 0.0f; | |
1365 float warmcnt = 0.0f; | |
1366 uint hot_idx = 0; | |
1367 // Loop starts at 2 because slot 1 is the fall-in path | |
1368 for( i = 2; i < _head->req(); i++ ) { | |
1369 float cnt = estimate_path_freq(_head->in(i)); | |
1370 if( cnt > hotcnt ) { // Grab hottest path | |
1371 warmcnt = hotcnt; | |
1372 hotcnt = cnt; | |
1373 hot_idx = i; | |
1374 } else if( cnt > warmcnt ) { // And 2nd hottest path | |
1375 warmcnt = cnt; | |
1376 } | |
1377 } | |
1378 | |
1379 // See if the hottest backedge is worthy of being an inner loop | |
1380 // by being much hotter than the next hottest backedge. | |
1381 if( hotcnt <= 0.0001 || | |
1382 hotcnt < 2.0*warmcnt ) hot_idx = 0;// No hot backedge | |
1383 | |
1384 // Peel out the backedges into a private merge point; peel | |
1385 // them all except optionally hot_idx. | |
1386 PhaseIterGVN &igvn = phase->_igvn; | |
1387 | |
1388 Node *hot_tail = NULL; | |
1389 // 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
|
1390 Node *r = new (phase->C) RegionNode(1); |
0 | 1391 for( i = 2; i < _head->req(); i++ ) { |
1392 if( i != hot_idx ) | |
1393 r->add_req( _head->in(i) ); | |
1394 else hot_tail = _head->in(i); | |
1395 } | |
1396 igvn.register_new_node_with_optimizer(r, _head); | |
1397 // Plug region into end of loop _head, followed by hot_tail | |
1398 while( _head->req() > 3 ) _head->del_req( _head->req()-1 ); | |
1399 _head->set_req(2, r); | |
1400 if( hot_idx ) _head->add_req(hot_tail); | |
1401 | |
1402 // Split all the Phis up between '_head' loop and the Region 'r' | |
1403 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1404 Node *out = _head->fast_out(j); | |
1405 if( out->is_Phi() ) { | |
1406 PhiNode* n = out->as_Phi(); | |
1407 igvn.hash_delete(n); // Delete from hash before hacking edges | |
1408 Node *hot_phi = NULL; | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
1409 Node *phi = new (phase->C) PhiNode(r, n->type(), n->adr_type()); |
0 | 1410 // Check all inputs for the ones to peel out |
1411 uint j = 1; | |
1412 for( uint i = 2; i < n->req(); i++ ) { | |
1413 if( i != hot_idx ) | |
1414 phi->set_req( j++, n->in(i) ); | |
1415 else hot_phi = n->in(i); | |
1416 } | |
1417 // Register the phi but do not transform until whole place transforms | |
1418 igvn.register_new_node_with_optimizer(phi, n); | |
1419 // Add the merge phi to the old Phi | |
1420 while( n->req() > 3 ) n->del_req( n->req()-1 ); | |
1421 n->set_req(2, phi); | |
1422 if( hot_idx ) n->add_req(hot_phi); | |
1423 } | |
1424 } | |
1425 | |
1426 | |
1427 // Insert a new IdealLoopTree inserted below me. Turn it into a clone | |
1428 // of self loop tree. Turn self into a loop headed by _head and with | |
1429 // tail being the new merge point. | |
1430 IdealLoopTree *ilt = new IdealLoopTree( phase, _head, _tail ); | |
1431 phase->set_loop(_tail,ilt); // Adjust tail | |
1432 _tail = r; // Self's tail is new merge point | |
1433 phase->set_loop(r,this); | |
1434 ilt->_child = _child; // New guy has my children | |
1435 _child = ilt; // Self has new guy as only child | |
1436 ilt->_parent = this; // new guy has self for parent | |
1437 ilt->_nest = _nest; // Same nesting depth (for now) | |
1438 | |
1439 // Starting with 'ilt', look for child loop trees using the same shared | |
1440 // header. Flatten these out; they will no longer be loops in the end. | |
1441 IdealLoopTree **pilt = &_child; | |
1442 while( ilt ) { | |
1443 if( ilt->_head == _head ) { | |
1444 uint i; | |
1445 for( i = 2; i < _head->req(); i++ ) | |
1446 if( _head->in(i) == ilt->_tail ) | |
1447 break; // Still a loop | |
1448 if( i == _head->req() ) { // No longer a loop | |
1449 // Flatten ilt. Hang ilt's "_next" list from the end of | |
1450 // ilt's '_child' list. Move the ilt's _child up to replace ilt. | |
1451 IdealLoopTree **cp = &ilt->_child; | |
1452 while( *cp ) cp = &(*cp)->_next; // Find end of child list | |
1453 *cp = ilt->_next; // Hang next list at end of child list | |
1454 *pilt = ilt->_child; // Move child up to replace ilt | |
1455 ilt->_head = NULL; // Flag as a loop UNIONED into parent | |
1456 ilt = ilt->_child; // Repeat using new ilt | |
1457 continue; // do not advance over ilt->_child | |
1458 } | |
1459 assert( ilt->_tail == hot_tail, "expected to only find the hot inner loop here" ); | |
1460 phase->set_loop(_head,ilt); | |
1461 } | |
1462 pilt = &ilt->_child; // Advance to next | |
1463 ilt = *pilt; | |
1464 } | |
1465 | |
1466 if( _child ) fix_parent( _child, this ); | |
1467 } | |
1468 | |
1469 //------------------------------beautify_loops--------------------------------- | |
1470 // Split shared headers and insert loop landing pads. | |
1471 // Insert a LoopNode to replace the RegionNode. | |
1472 // Return TRUE if loop tree is structurally changed. | |
1473 bool IdealLoopTree::beautify_loops( PhaseIdealLoop *phase ) { | |
1474 bool result = false; | |
1475 // Cache parts in locals for easy | |
1476 PhaseIterGVN &igvn = phase->_igvn; | |
1477 | |
1478 igvn.hash_delete(_head); // Yank from hash before hacking edges | |
1479 | |
1480 // Check for multiple fall-in paths. Peel off a landing pad if need be. | |
1481 int fall_in_cnt = 0; | |
1482 for( uint i = 1; i < _head->req(); i++ ) | |
1483 if( !phase->is_member( this, _head->in(i) ) ) | |
1484 fall_in_cnt++; | |
1485 assert( fall_in_cnt, "at least 1 fall-in path" ); | |
1486 if( fall_in_cnt > 1 ) // Need a loop landing pad to merge fall-ins | |
1487 split_fall_in( phase, fall_in_cnt ); | |
1488 | |
1489 // Swap inputs to the _head and all Phis to move the fall-in edge to | |
1490 // the left. | |
1491 fall_in_cnt = 1; | |
1492 while( phase->is_member( this, _head->in(fall_in_cnt) ) ) | |
1493 fall_in_cnt++; | |
1494 if( fall_in_cnt > 1 ) { | |
1495 // Since I am just swapping inputs I do not need to update def-use info | |
1496 Node *tmp = _head->in(1); | |
1497 _head->set_req( 1, _head->in(fall_in_cnt) ); | |
1498 _head->set_req( fall_in_cnt, tmp ); | |
1499 // Swap also all Phis | |
1500 for (DUIterator_Fast imax, i = _head->fast_outs(imax); i < imax; i++) { | |
1501 Node* phi = _head->fast_out(i); | |
1502 if( phi->is_Phi() ) { | |
1503 igvn.hash_delete(phi); // Yank from hash before hacking edges | |
1504 tmp = phi->in(1); | |
1505 phi->set_req( 1, phi->in(fall_in_cnt) ); | |
1506 phi->set_req( fall_in_cnt, tmp ); | |
1507 } | |
1508 } | |
1509 } | |
1510 assert( !phase->is_member( this, _head->in(1) ), "left edge is fall-in" ); | |
1511 assert( phase->is_member( this, _head->in(2) ), "right edge is loop" ); | |
1512 | |
1513 // If I am a shared header (multiple backedges), peel off the many | |
1514 // backedges into a private merge point and use the merge point as | |
1515 // the one true backedge. | |
1516 if( _head->req() > 3 ) { | |
2445 | 1517 // Merge the many backedges into a single backedge but leave |
1518 // the hottest backedge as separate edge for the following peel. | |
0 | 1519 merge_many_backedges( phase ); |
1520 result = true; | |
1521 } | |
1522 | |
2445 | 1523 // If I have one hot backedge, peel off myself loop. |
0 | 1524 // I better be the outermost loop. |
1525 if( _head->req() > 3 ) { | |
1526 split_outer_loop( phase ); | |
1527 result = true; | |
1528 | |
1529 } else if( !_head->is_Loop() && !_irreducible ) { | |
1530 // 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
|
1531 Node *l = new (phase->C) LoopNode( _head->in(1), _head->in(2) ); |
0 | 1532 l = igvn.register_new_node_with_optimizer(l, _head); |
1533 phase->set_created_loop_node(); | |
1534 // 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
|
1535 phase->_igvn.replace_node( _head, l ); |
0 | 1536 _head = l; |
1537 phase->set_loop(_head, this); | |
1538 } | |
1539 | |
1540 // Now recursively beautify nested loops | |
1541 if( _child ) result |= _child->beautify_loops( phase ); | |
1542 if( _next ) result |= _next ->beautify_loops( phase ); | |
1543 return result; | |
1544 } | |
1545 | |
1546 //------------------------------allpaths_check_safepts---------------------------- | |
1547 // Allpaths backwards scan from loop tail, terminating each path at first safepoint | |
1548 // encountered. Helper for check_safepts. | |
1549 void IdealLoopTree::allpaths_check_safepts(VectorSet &visited, Node_List &stack) { | |
1550 assert(stack.size() == 0, "empty stack"); | |
1551 stack.push(_tail); | |
1552 visited.Clear(); | |
1553 visited.set(_tail->_idx); | |
1554 while (stack.size() > 0) { | |
1555 Node* n = stack.pop(); | |
1556 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) { | |
1557 // Terminate this path | |
1558 } else if (n->Opcode() == Op_SafePoint) { | |
1559 if (_phase->get_loop(n) != this) { | |
1560 if (_required_safept == NULL) _required_safept = new Node_List(); | |
1561 _required_safept->push(n); // save the one closest to the tail | |
1562 } | |
1563 // Terminate this path | |
1564 } else { | |
1565 uint start = n->is_Region() ? 1 : 0; | |
1566 uint end = n->is_Region() && !n->is_Loop() ? n->req() : start + 1; | |
1567 for (uint i = start; i < end; i++) { | |
1568 Node* in = n->in(i); | |
1569 assert(in->is_CFG(), "must be"); | |
1570 if (!visited.test_set(in->_idx) && is_member(_phase->get_loop(in))) { | |
1571 stack.push(in); | |
1572 } | |
1573 } | |
1574 } | |
1575 } | |
1576 } | |
1577 | |
1578 //------------------------------check_safepts---------------------------- | |
1579 // Given dominators, try to find loops with calls that must always be | |
1580 // executed (call dominates loop tail). These loops do not need non-call | |
1581 // safepoints (ncsfpt). | |
1582 // | |
1583 // A complication is that a safepoint in a inner loop may be needed | |
1584 // by an outer loop. In the following, the inner loop sees it has a | |
1585 // call (block 3) on every path from the head (block 2) to the | |
1586 // backedge (arc 3->2). So it deletes the ncsfpt (non-call safepoint) | |
1587 // in block 2, _but_ this leaves the outer loop without a safepoint. | |
1588 // | |
1589 // entry 0 | |
1590 // | | |
1591 // v | |
1592 // outer 1,2 +->1 | |
1593 // | | | |
1594 // | v | |
1595 // | 2<---+ ncsfpt in 2 | |
1596 // |_/|\ | | |
1597 // | v | | |
1598 // inner 2,3 / 3 | call in 3 | |
1599 // / | | | |
1600 // v +--+ | |
1601 // exit 4 | |
1602 // | |
1603 // | |
1604 // This method creates a list (_required_safept) of ncsfpt nodes that must | |
1605 // be protected is created for each loop. When a ncsfpt maybe deleted, it | |
1606 // is first looked for in the lists for the outer loops of the current loop. | |
1607 // | |
1608 // The insights into the problem: | |
1609 // A) counted loops are okay | |
1610 // B) innermost loops are okay (only an inner loop can delete | |
1611 // a ncsfpt needed by an outer loop) | |
1612 // C) a loop is immune from an inner loop deleting a safepoint | |
1613 // if the loop has a call on the idom-path | |
1614 // D) a loop is also immune if it has a ncsfpt (non-call safepoint) on the | |
1615 // idom-path that is not in a nested loop | |
1616 // E) otherwise, an ncsfpt on the idom-path that is nested in an inner | |
1617 // loop needs to be prevented from deletion by an inner loop | |
1618 // | |
1619 // There are two analyses: | |
1620 // 1) The first, and cheaper one, scans the loop body from | |
1621 // tail to head following the idom (immediate dominator) | |
1622 // chain, looking for the cases (C,D,E) above. | |
1623 // Since inner loops are scanned before outer loops, there is summary | |
1624 // information about inner loops. Inner loops can be skipped over | |
1625 // when the tail of an inner loop is encountered. | |
1626 // | |
1627 // 2) The second, invoked if the first fails to find a call or ncsfpt on | |
1628 // the idom path (which is rare), scans all predecessor control paths | |
1629 // from the tail to the head, terminating a path when a call or sfpt | |
1630 // is encountered, to find the ncsfpt's that are closest to the tail. | |
1631 // | |
1632 void IdealLoopTree::check_safepts(VectorSet &visited, Node_List &stack) { | |
1633 // Bottom up traversal | |
1634 IdealLoopTree* ch = _child; | |
6636 | 1635 if (_child) _child->check_safepts(visited, stack); |
1636 if (_next) _next ->check_safepts(visited, stack); | |
0 | 1637 |
1638 if (!_head->is_CountedLoop() && !_has_sfpt && _parent != NULL && !_irreducible) { | |
1639 bool has_call = false; // call on dom-path | |
1640 bool has_local_ncsfpt = false; // ncsfpt on dom-path at this loop depth | |
1641 Node* nonlocal_ncsfpt = NULL; // ncsfpt on dom-path at a deeper depth | |
1642 // Scan the dom-path nodes from tail to head | |
1643 for (Node* n = tail(); n != _head; n = _phase->idom(n)) { | |
1644 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) { | |
1645 has_call = true; | |
1646 _has_sfpt = 1; // Then no need for a safept! | |
1647 break; | |
1648 } else if (n->Opcode() == Op_SafePoint) { | |
1649 if (_phase->get_loop(n) == this) { | |
1650 has_local_ncsfpt = true; | |
1651 break; | |
1652 } | |
1653 if (nonlocal_ncsfpt == NULL) { | |
1654 nonlocal_ncsfpt = n; // save the one closest to the tail | |
1655 } | |
1656 } else { | |
1657 IdealLoopTree* nlpt = _phase->get_loop(n); | |
1658 if (this != nlpt) { | |
1659 // If at an inner loop tail, see if the inner loop has already | |
1660 // recorded seeing a call on the dom-path (and stop.) If not, | |
1661 // jump to the head of the inner loop. | |
1662 assert(is_member(nlpt), "nested loop"); | |
1663 Node* tail = nlpt->_tail; | |
1664 if (tail->in(0)->is_If()) tail = tail->in(0); | |
1665 if (n == tail) { | |
1666 // If inner loop has call on dom-path, so does outer loop | |
1667 if (nlpt->_has_sfpt) { | |
1668 has_call = true; | |
1669 _has_sfpt = 1; | |
1670 break; | |
1671 } | |
1672 // Skip to head of inner loop | |
1673 assert(_phase->is_dominator(_head, nlpt->_head), "inner head dominated by outer head"); | |
1674 n = nlpt->_head; | |
1675 } | |
1676 } | |
1677 } | |
1678 } | |
1679 // Record safept's that this loop needs preserved when an | |
1680 // inner loop attempts to delete it's safepoints. | |
1681 if (_child != NULL && !has_call && !has_local_ncsfpt) { | |
1682 if (nonlocal_ncsfpt != NULL) { | |
1683 if (_required_safept == NULL) _required_safept = new Node_List(); | |
1684 _required_safept->push(nonlocal_ncsfpt); | |
1685 } else { | |
1686 // Failed to find a suitable safept on the dom-path. Now use | |
1687 // an all paths walk from tail to head, looking for safepoints to preserve. | |
1688 allpaths_check_safepts(visited, stack); | |
1689 } | |
1690 } | |
1691 } | |
1692 } | |
1693 | |
1694 //---------------------------is_deleteable_safept---------------------------- | |
1695 // Is safept not required by an outer loop? | |
1696 bool PhaseIdealLoop::is_deleteable_safept(Node* sfpt) { | |
1697 assert(sfpt->Opcode() == Op_SafePoint, ""); | |
1698 IdealLoopTree* lp = get_loop(sfpt)->_parent; | |
1699 while (lp != NULL) { | |
1700 Node_List* sfpts = lp->_required_safept; | |
1701 if (sfpts != NULL) { | |
1702 for (uint i = 0; i < sfpts->size(); i++) { | |
1703 if (sfpt == sfpts->at(i)) | |
1704 return false; | |
1705 } | |
1706 } | |
1707 lp = lp->_parent; | |
1708 } | |
1709 return true; | |
1710 } | |
1711 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1712 //---------------------------replace_parallel_iv------------------------------- |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1713 // Replace parallel induction variable (parallel to trip counter) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1714 void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1715 assert(loop->_head->is_CountedLoop(), ""); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1716 CountedLoopNode *cl = loop->_head->as_CountedLoop(); |
3850
6987871cfb9b
7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents:
3845
diff
changeset
|
1717 if (!cl->is_valid_counted_loop()) |
6987871cfb9b
7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents:
3845
diff
changeset
|
1718 return; // skip malformed counted loop |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1719 Node *incr = cl->incr(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1720 if (incr == NULL) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1721 return; // Dead loop? |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1722 Node *init = cl->init_trip(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1723 Node *phi = cl->phi(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1724 int stride_con = cl->stride_con(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1725 |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1726 // Visit all children, looking for Phis |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1727 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
|
1728 Node *out = cl->out(i); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1729 // Look for other phis (secondary IVs). Skip dead ones |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1730 if (!out->is_Phi() || out == phi || !has_node(out)) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1731 continue; |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1732 PhiNode* phi2 = out->as_Phi(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1733 Node *incr2 = phi2->in( LoopNode::LoopBackControl ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1734 // Look for induction variables of the form: X += constant |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1735 if (phi2->region() != loop->_head || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1736 incr2->req() != 3 || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1737 incr2->in(1) != phi2 || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1738 incr2 == incr || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1739 incr2->Opcode() != Op_AddI || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1740 !incr2->in(2)->is_Con()) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1741 continue; |
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 // Check for parallel induction variable (parallel to trip counter) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1744 // 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
|
1745 // 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
|
1746 // 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
|
1747 // expressions. |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1748 Node *init2 = phi2->in( LoopNode::EntryControl ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1749 int stride_con2 = incr2->in(2)->get_int(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1750 |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1751 // 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
|
1752 // 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
|
1753 // 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
|
1754 // 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
|
1755 // 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
|
1756 // 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
|
1757 // also easy to handle. |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1758 int ratio_con = stride_con2/stride_con; |
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 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
|
1761 #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
|
1762 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
|
1763 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
|
1764 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
|
1765 } |
2c24ef16533d
7035946: Up to 15% regression on JDK 7 b136 vs b135 on specjvm2008.crypto.rsa on x64
kvn
parents:
3850
diff
changeset
|
1766 #endif |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1767 // Convert to using the trip counter. The parallel induction |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1768 // 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
|
1769 // amount, the difference between their respective initial values. |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1770 // It is scaled by the 'ratio_con'. |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1771 Node* ratio = _igvn.intcon(ratio_con); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1772 set_ctrl(ratio, C->root()); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
1773 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
|
1774 _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
|
1775 set_early_ctrl(ratio_init); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
1776 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
|
1777 _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
|
1778 set_early_ctrl(diff); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
1779 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
|
1780 _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
|
1781 set_ctrl(ratio_idx, cl); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
1782 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
|
1783 _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
|
1784 set_ctrl(add, cl); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1785 _igvn.replace_node( phi2, add ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1786 // Sometimes an induction variable is unused |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1787 if (add->outcnt() == 0) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1788 _igvn.remove_dead_node(add); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1789 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1790 --i; // deleted this phi; rescan starting with next position |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1791 continue; |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1792 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1793 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1794 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1795 |
0 | 1796 //------------------------------counted_loop----------------------------------- |
1797 // Convert to counted loops where possible | |
1798 void IdealLoopTree::counted_loop( PhaseIdealLoop *phase ) { | |
1799 | |
1800 // For grins, set the inner-loop flag here | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1801 if (!_child) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1802 if (_head->is_Loop()) _head->as_Loop()->set_inner_loop(); |
0 | 1803 } |
1804 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1805 if (_head->is_CountedLoop() || |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1806 phase->is_counted_loop(_head, this)) { |
0 | 1807 _has_sfpt = 1; // Indicate we do not need a safepoint here |
1808 | |
6636 | 1809 // Look for safepoints to remove. |
1810 Node_List* sfpts = _safepts; | |
1811 if (sfpts != NULL) { | |
1812 for (uint i = 0; i < sfpts->size(); i++) { | |
1813 Node* n = sfpts->at(i); | |
1814 assert(phase->get_loop(n) == this, ""); | |
1815 if (phase->is_deleteable_safept(n)) { | |
1816 phase->lazy_replace(n, n->in(TypeFunc::Control)); | |
1817 } | |
1818 } | |
1819 } | |
0 | 1820 |
1821 // Look for induction variables | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1822 phase->replace_parallel_iv(this); |
0 | 1823 |
1824 } else if (_parent != NULL && !_irreducible) { | |
1825 // Not a counted loop. | |
6636 | 1826 // Look for a safepoint on the idom-path. |
1827 Node* sfpt = tail(); | |
1828 for (; sfpt != _head; sfpt = phase->idom(sfpt)) { | |
1829 if (sfpt->Opcode() == Op_SafePoint && phase->get_loop(sfpt) == this) | |
1830 break; // Found one | |
0 | 1831 } |
6636 | 1832 // Delete other safepoints in this loop. |
1833 Node_List* sfpts = _safepts; | |
1834 if (sfpts != NULL && sfpt != _head && sfpt->Opcode() == Op_SafePoint) { | |
1835 for (uint i = 0; i < sfpts->size(); i++) { | |
1836 Node* n = sfpts->at(i); | |
1837 assert(phase->get_loop(n) == this, ""); | |
1838 if (n != sfpt && phase->is_deleteable_safept(n)) { | |
1839 phase->lazy_replace(n, n->in(TypeFunc::Control)); | |
1840 } | |
1841 } | |
0 | 1842 } |
1843 } | |
1844 | |
1845 // Recursively | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1846 if (_child) _child->counted_loop( phase ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1847 if (_next) _next ->counted_loop( phase ); |
0 | 1848 } |
1849 | |
1850 #ifndef PRODUCT | |
1851 //------------------------------dump_head-------------------------------------- | |
1852 // Dump 1 liner for loop header info | |
1853 void IdealLoopTree::dump_head( ) const { | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1854 for (uint i=0; i<_nest; i++) |
0 | 1855 tty->print(" "); |
1856 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
|
1857 if (_irreducible) tty->print(" IRREDUCIBLE"); |
3345 | 1858 Node* entry = _head->in(LoopNode::EntryControl); |
1859 if (LoopLimitCheck) { | |
1860 Node* predicate = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
1861 if (predicate != NULL ) { | |
1862 tty->print(" limit_check"); | |
1863 entry = entry->in(0)->in(0); | |
1864 } | |
1865 } | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1866 if (UseLoopPredicate) { |
3345 | 1867 entry = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); |
2445 | 1868 if (entry != NULL) { |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1869 tty->print(" predicated"); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1870 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1871 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1872 if (_head->is_CountedLoop()) { |
0 | 1873 CountedLoopNode *cl = _head->as_CountedLoop(); |
1874 tty->print(" counted"); | |
2465 | 1875 |
1876 Node* init_n = cl->init_trip(); | |
1877 if (init_n != NULL && init_n->is_Con()) | |
1878 tty->print(" [%d,", cl->init_trip()->get_int()); | |
1879 else | |
1880 tty->print(" [int,"); | |
1881 Node* limit_n = cl->limit(); | |
1882 if (limit_n != NULL && limit_n->is_Con()) | |
1883 tty->print("%d),", cl->limit()->get_int()); | |
1884 else | |
1885 tty->print("int),"); | |
1886 int stride_con = cl->stride_con(); | |
1887 if (stride_con > 0) tty->print("+"); | |
1888 tty->print("%d", stride_con); | |
1889 | |
6614
006050192a5a
6340864: Implement vectorization optimizations in hotspot-server
kvn
parents:
6179
diff
changeset
|
1890 tty->print(" (%d iters) ", (int)cl->profile_trip_cnt()); |
006050192a5a
6340864: Implement vectorization optimizations in hotspot-server
kvn
parents:
6179
diff
changeset
|
1891 |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1892 if (cl->is_pre_loop ()) tty->print(" pre" ); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1893 if (cl->is_main_loop()) tty->print(" main"); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1894 if (cl->is_post_loop()) tty->print(" post"); |
0 | 1895 } |
1896 tty->cr(); | |
1897 } | |
1898 | |
1899 //------------------------------dump------------------------------------------- | |
1900 // Dump loops by loop tree | |
1901 void IdealLoopTree::dump( ) const { | |
1902 dump_head(); | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1903 if (_child) _child->dump(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1904 if (_next) _next ->dump(); |
0 | 1905 } |
1906 | |
1907 #endif | |
1908 | |
367
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1909 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
|
1910 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
|
1911 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
|
1912 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
|
1913 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
|
1914 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
|
1915 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
|
1916 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
|
1917 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1918 } else { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1919 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
|
1920 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
|
1921 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
|
1922 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
|
1923 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
|
1924 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
|
1925 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
|
1926 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1927 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
|
1928 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
|
1929 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
|
1930 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
|
1931 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
|
1932 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1933 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
|
1934 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
|
1935 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
|
1936 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
|
1937 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1938 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
1939 |
1172 | 1940 //---------------------collect_potentially_useful_predicates----------------------- |
1941 // Helper function to collect potentially useful predicates to prevent them from | |
1942 // being eliminated by PhaseIdealLoop::eliminate_useless_predicates | |
1943 void PhaseIdealLoop::collect_potentially_useful_predicates( | |
1944 IdealLoopTree * loop, Unique_Node_List &useful_predicates) { | |
1945 if (loop->_child) { // child | |
1946 collect_potentially_useful_predicates(loop->_child, useful_predicates); | |
1947 } | |
1948 | |
1949 // 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
|
1950 if (loop->_head->is_Loop() && |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1951 !loop->_irreducible && |
1172 | 1952 !loop->tail()->is_top()) { |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1953 LoopNode* lpn = loop->_head->as_Loop(); |
1172 | 1954 Node* entry = lpn->in(LoopNode::EntryControl); |
3345 | 1955 Node* predicate_proj = find_predicate(entry); // loop_limit_check first |
1172 | 1956 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
|
1957 assert(entry->in(0)->in(1)->in(1)->Opcode() == Op_Opaque1, "must be"); |
1172 | 1958 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one |
3345 | 1959 entry = entry->in(0)->in(0); |
1960 } | |
1961 predicate_proj = find_predicate(entry); // Predicate | |
1962 if (predicate_proj != NULL ) { | |
1963 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one | |
1172 | 1964 } |
1965 } | |
1966 | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1967 if (loop->_next) { // sibling |
1172 | 1968 collect_potentially_useful_predicates(loop->_next, useful_predicates); |
1969 } | |
1970 } | |
1971 | |
1972 //------------------------eliminate_useless_predicates----------------------------- | |
1973 // Eliminate all inserted predicates if they could not be used by loop predication. | |
3345 | 1974 // Note: it will also eliminates loop limits check predicate since it also uses |
1975 // Opaque1 node (see Parse::add_predicate()). | |
1172 | 1976 void PhaseIdealLoop::eliminate_useless_predicates() { |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1977 if (C->predicate_count() == 0) |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
1978 return; // no predicate left |
1172 | 1979 |
1980 Unique_Node_List useful_predicates; // to store useful predicates | |
1981 if (C->has_loops()) { | |
1982 collect_potentially_useful_predicates(_ltree_root->_child, useful_predicates); | |
1983 } | |
1984 | |
1985 for (int i = C->predicate_count(); i > 0; i--) { | |
1986 Node * n = C->predicate_opaque1_node(i-1); | |
1987 assert(n->Opcode() == Op_Opaque1, "must be"); | |
1988 if (!useful_predicates.member(n)) { // not in the useful list | |
1989 _igvn.replace_node(n, n->in(1)); | |
1990 } | |
1991 } | |
1992 } | |
1993 | |
8048
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
1994 //------------------------process_expensive_nodes----------------------------- |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
1995 // 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
|
1996 // 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
|
1997 // 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
|
1998 // 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
|
1999 // not executed more frequently. |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2000 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
|
2001 assert(OptimizeExpensiveOps, "optimization off?"); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2002 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2003 // 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
|
2004 C->sort_expensive_nodes(); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2005 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2006 bool progress = false; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2007 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2008 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
|
2009 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
|
2010 int start = i; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2011 // 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
|
2012 i++; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2013 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
|
2014 int end = i; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2015 // 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
|
2016 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
|
2017 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
|
2018 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
|
2019 continue; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2020 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2021 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
|
2022 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
|
2023 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
|
2024 continue; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2025 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2026 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2027 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
|
2028 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2029 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
|
2030 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
|
2031 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2032 Node* parent_c1 = c1; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2033 Node* parent_c2 = c2; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2034 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2035 // 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
|
2036 // 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
|
2037 // 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
|
2038 // If. |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2039 if (c1->is_Loop()) { |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2040 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
|
2041 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2042 if (c2->is_Loop()) { |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2043 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
|
2044 } |
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 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
|
2047 _igvn._worklist.push(n1); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2048 _igvn._worklist.push(n2); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2049 continue; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2050 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2051 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2052 // 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
|
2053 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
|
2054 c2 = c1; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2055 } 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
|
2056 c1 = c2; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2057 } 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
|
2058 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
|
2059 // 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
|
2060 // before the if. |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2061 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
|
2062 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2063 // Do the actual moves |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2064 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
|
2065 _igvn.hash_delete(n1); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2066 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
|
2067 _igvn.hash_insert(n1); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2068 _igvn._worklist.push(n1); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2069 progress = true; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2070 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2071 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
|
2072 _igvn.hash_delete(n2); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2073 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
|
2074 _igvn.hash_insert(n2); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2075 _igvn._worklist.push(n2); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2076 progress = true; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2077 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2078 } |
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 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2081 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2082 return progress; |
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 |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2085 |
0 | 2086 //============================================================================= |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2087 //----------------------------build_and_optimize------------------------------- |
0 | 2088 // Create a PhaseLoop. Build the ideal Loop tree. Map each Ideal Node to |
2089 // 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
|
2090 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
|
2091 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
|
2092 |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2093 int old_progress = C->major_progress(); |
2403 | 2094 uint orig_worklist_size = _igvn._worklist.size(); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2095 |
0 | 2096 // Reset major-progress flag for the driver's heuristics |
2097 C->clear_major_progress(); | |
2098 | |
2099 #ifndef PRODUCT | |
2100 // Capture for later assert | |
2101 uint unique = C->unique(); | |
2102 _loop_invokes++; | |
2103 _loop_work += unique; | |
2104 #endif | |
2105 | |
2106 // True if the method has at least 1 irreducible loop | |
2107 _has_irreducible_loops = false; | |
2108 | |
2109 _created_loop_node = false; | |
2110 | |
2111 Arena *a = Thread::current()->resource_area(); | |
2112 VectorSet visited(a); | |
2113 // Pre-grow the mapping from Nodes to IdealLoopTrees. | |
2114 _nodes.map(C->unique(), NULL); | |
2115 memset(_nodes.adr(), 0, wordSize * C->unique()); | |
2116 | |
2117 // Pre-build the top-level outermost loop tree entry | |
2118 _ltree_root = new IdealLoopTree( this, C->root(), C->root() ); | |
2119 // Do not need a safepoint at the top level | |
2120 _ltree_root->_has_sfpt = 1; | |
2121 | |
2445 | 2122 // Initialize Dominators. |
2123 // Checked in clone_loop_predicate() during beautify_loops(). | |
2124 _idom_size = 0; | |
2125 _idom = NULL; | |
2126 _dom_depth = NULL; | |
2127 _dom_stk = NULL; | |
2128 | |
0 | 2129 // Empty pre-order array |
2130 allocate_preorders(); | |
2131 | |
2132 // Build a loop tree on the fly. Build a mapping from CFG nodes to | |
2133 // IdealLoopTree entries. Data nodes are NOT walked. | |
2134 build_loop_tree(); | |
2135 // Check for bailout, and return | |
2136 if (C->failing()) { | |
2137 return; | |
2138 } | |
2139 | |
2140 // No loops after all | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2141 if( !_ltree_root->_child && !_verify_only ) C->set_has_loops(false); |
0 | 2142 |
2143 // There should always be an outer loop containing the Root and Return nodes. | |
2144 // If not, we have a degenerate empty program. Bail out in this case. | |
2145 if (!has_node(C->root())) { | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2146 if (!_verify_only) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2147 C->clear_major_progress(); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2148 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
|
2149 } |
0 | 2150 return; |
2151 } | |
2152 | |
2153 // 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
|
2154 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
|
2155 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
|
2156 if (stop_early && !do_expensive_nodes) { |
0 | 2157 _igvn.optimize(); // Cleanup NeverBranches |
2158 return; | |
2159 } | |
2160 | |
2161 // Set loop nesting depth | |
2162 _ltree_root->set_nest( 0 ); | |
2163 | |
2164 // Split shared headers and insert loop landing pads. | |
2165 // 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
|
2166 if( !_verify_me && !_verify_only && _ltree_root->_child ) { |
10405 | 2167 C->print_method(PHASE_BEFORE_BEAUTIFY_LOOPS, 3); |
0 | 2168 if( _ltree_root->_child->beautify_loops( this ) ) { |
2169 // Re-build loop tree! | |
2170 _ltree_root->_child = NULL; | |
2171 _nodes.clear(); | |
2172 reallocate_preorders(); | |
2173 build_loop_tree(); | |
2174 // Check for bailout, and return | |
2175 if (C->failing()) { | |
2176 return; | |
2177 } | |
2178 // Reset loop nesting depth | |
2179 _ltree_root->set_nest( 0 ); | |
222 | 2180 |
10405 | 2181 C->print_method(PHASE_AFTER_BEAUTIFY_LOOPS, 3); |
0 | 2182 } |
2183 } | |
2184 | |
2185 // Build Dominators for elision of NULL checks & loop finding. | |
2186 // Since nodes do not have a slot for immediate dominator, make | |
605 | 2187 // a persistent side array for that info indexed on node->_idx. |
0 | 2188 _idom_size = C->unique(); |
2189 _idom = NEW_RESOURCE_ARRAY( Node*, _idom_size ); | |
2190 _dom_depth = NEW_RESOURCE_ARRAY( uint, _idom_size ); | |
2191 _dom_stk = NULL; // Allocated on demand in recompute_dom_depth | |
2192 memset( _dom_depth, 0, _idom_size * sizeof(uint) ); | |
2193 | |
2194 Dominators(); | |
2195 | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2196 if (!_verify_only) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2197 // As a side effect, Dominators removed any unreachable CFG paths |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2198 // 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
|
2199 // we do it here. |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2200 for( uint i = 1; i < C->root()->req(); i++ ) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2201 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
|
2202 _igvn.delete_input_of(C->root(), i); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2203 i--; // Rerun same iteration on compressed edges |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2204 } |
0 | 2205 } |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2206 |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2207 // 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
|
2208 // always be executed (call dominates loop tail). These loops do |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2209 // not need a separate safepoint. |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2210 Node_List cisstack(a); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2211 _ltree_root->check_safepts(visited, cisstack); |
0 | 2212 } |
2213 | |
2214 // Walk the DATA nodes and place into loops. Find earliest control | |
2215 // node. For CFG nodes, the _nodes array starts out and remains | |
2216 // holding the associated IdealLoopTree pointer. For DATA nodes, the | |
2217 // _nodes array holds the earliest legal controlling CFG node. | |
2218 | |
2219 // Allocate stack with enough space to avoid frequent realloc | |
2220 int stack_size = (C->unique() >> 1) + 16; // (unique>>1)+16 from Java2D stats | |
2221 Node_Stack nstack( a, stack_size ); | |
2222 | |
2223 visited.Clear(); | |
2224 Node_List worklist(a); | |
2225 // Don't need C->root() on worklist since | |
2226 // it will be processed among C->top() inputs | |
2227 worklist.push( C->top() ); | |
2228 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
|
2229 build_loop_early( visited, worklist, nstack ); |
0 | 2230 |
2231 // Given early legal placement, try finding counted loops. This placement | |
2232 // is good enough to discover most loop invariants. | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2233 if( !_verify_me && !_verify_only ) |
0 | 2234 _ltree_root->counted_loop( this ); |
2235 | |
2236 // Find latest loop placement. Find ideal loop placement. | |
2237 visited.Clear(); | |
2238 init_dom_lca_tags(); | |
2239 // Need C->root() on worklist when processing outs | |
2240 worklist.push( C->root() ); | |
2241 NOT_PRODUCT( C->verify_graph_edges(); ) | |
2242 worklist.push( C->top() ); | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2243 build_loop_late( visited, worklist, nstack ); |
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 if (_verify_only) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2246 // restore major progress flag |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2247 for (int i = 0; i < old_progress; i++) |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2248 C->set_major_progress(); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2249 assert(C->unique() == unique, "verification mode made Nodes? ? ?"); |
2403 | 2250 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
|
2251 return; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2252 } |
0 | 2253 |
8868
30f42e691e70
8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address
kvn
parents:
8048
diff
changeset
|
2254 // 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
|
2255 while (_deadlist.size()) { |
30f42e691e70
8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address
kvn
parents:
8048
diff
changeset
|
2256 _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
|
2257 } |
30f42e691e70
8004640: C2 assert failure in memnode.cpp: NULL+offs not RAW address
kvn
parents:
8048
diff
changeset
|
2258 |
8048
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2259 if (stop_early) { |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2260 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
|
2261 if (process_expensive_nodes()) { |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2262 // 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
|
2263 // 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
|
2264 // 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
|
2265 // nodes again. |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2266 C->set_major_progress(); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2267 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2268 _igvn.optimize(); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2269 return; |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2270 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2271 |
2445 | 2272 // Some parser-inserted loop predicates could never be used by loop |
2273 // predication or they were moved away from loop during some optimizations. | |
2274 // For example, peeling. Eliminate them before next loop optimizations. | |
3345 | 2275 if (UseLoopPredicate || LoopLimitCheck) { |
1172 | 2276 eliminate_useless_predicates(); |
2277 } | |
2278 | |
0 | 2279 #ifndef PRODUCT |
2280 C->verify_graph_edges(); | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
2281 if (_verify_me) { // Nested verify pass? |
0 | 2282 // Check to see if the verify mode is broken |
2283 assert(C->unique() == unique, "non-optimize mode made Nodes? ? ?"); | |
2284 return; | |
2285 } | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
2286 if(VerifyLoopOptimizations) verify(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
2287 if(TraceLoopOpts && C->has_loops()) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
2288 _ltree_root->dump(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2248
diff
changeset
|
2289 } |
0 | 2290 #endif |
2291 | |
4064
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2292 if (skip_loop_opts) { |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2293 // Cleanup any modified bits |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2294 _igvn.optimize(); |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2295 |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2296 if (C->log() != NULL) { |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2297 log_loop_tree(_ltree_root, _ltree_root, C->log()); |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2298 } |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2299 return; |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2300 } |
670a74b863fc
7107042: assert(no_dead_loop) failed: dead loop detected
kvn
parents:
3936
diff
changeset
|
2301 |
0 | 2302 if (ReassociateInvariants) { |
2303 // Reassociate invariants and prep for split_thru_phi | |
2304 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) { | |
2305 IdealLoopTree* lpt = iter.current(); | |
2306 if (!lpt->is_counted() || !lpt->is_inner()) continue; | |
2307 | |
2308 lpt->reassociate_invariants(this); | |
2309 | |
2310 // Because RCE opportunities can be masked by split_thru_phi, | |
2311 // look for RCE candidates and inhibit split_thru_phi | |
2312 // on just their loop-phi's for this pass of loop opts | |
1172 | 2313 if (SplitIfBlocks && do_split_ifs) { |
0 | 2314 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
|
2315 lpt->_rce_candidate = 1; // = true |
0 | 2316 } |
2317 } | |
2318 } | |
2319 } | |
2320 | |
2321 // Check for aggressive application of split-if and other transforms | |
2322 // that require basic-block info (like cloning through Phi's) | |
2323 if( SplitIfBlocks && do_split_ifs ) { | |
2324 visited.Clear(); | |
2325 split_if_with_blocks( visited, nstack ); | |
2326 NOT_PRODUCT( if( VerifyLoopOptimizations ) verify(); ); | |
2327 } | |
2328 | |
8048
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2329 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
|
2330 C->set_major_progress(); |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2331 } |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
2332 |
1172 | 2333 // Perform loop predication before iteration splitting |
2445 | 2334 if (C->has_loops() && !C->major_progress() && (C->predicate_count() > 0)) { |
1172 | 2335 _ltree_root->_child->loop_predication(this); |
2336 } | |
2337 | |
1763 | 2338 if (OptimizeFill && UseLoopPredicate && C->has_loops() && !C->major_progress()) { |
2339 if (do_intrinsify_fill()) { | |
2340 C->set_major_progress(); | |
2341 } | |
2342 } | |
2343 | |
0 | 2344 // Perform iteration-splitting on inner loops. Split iterations to avoid |
2345 // range checks or one-shot null checks. | |
2346 | |
2347 // If split-if's didn't hack the graph too bad (no CFG changes) | |
2348 // then do loop opts. | |
1172 | 2349 if (C->has_loops() && !C->major_progress()) { |
0 | 2350 memset( worklist.adr(), 0, worklist.Size()*sizeof(Node*) ); |
2351 _ltree_root->_child->iteration_split( this, worklist ); | |
2352 // No verify after peeling! GCM has hoisted code out of the loop. | |
2353 // After peeling, the hoisted code could sink inside the peeled area. | |
2354 // The peeling code does not try to recompute the best location for | |
2355 // all the code before the peeled area, so the verify pass will always | |
2356 // complain about it. | |
2357 } | |
2358 // Do verify graph edges in any case | |
2359 NOT_PRODUCT( C->verify_graph_edges(); ); | |
2360 | |
1172 | 2361 if (!do_split_ifs) { |
0 | 2362 // We saw major progress in Split-If to get here. We forced a |
2363 // pass with unrolling and not split-if, however more split-if's | |
2364 // might make progress. If the unrolling didn't make progress | |
2365 // then the major-progress flag got cleared and we won't try | |
2366 // another round of Split-If. In particular the ever-common | |
2367 // instance-of/check-cast pattern requires at least 2 rounds of | |
2368 // Split-If to clear out. | |
2369 C->set_major_progress(); | |
2370 } | |
2371 | |
2372 // Repeat loop optimizations if new loops were seen | |
2373 if (created_loop_node()) { | |
2374 C->set_major_progress(); | |
2375 } | |
2376 | |
2445 | 2377 // Keep loop predicates and perform optimizations with them |
2378 // until no more loop optimizations could be done. | |
2379 // After that switch predicates off and do more loop optimizations. | |
2380 if (!C->major_progress() && (C->predicate_count() > 0)) { | |
2381 C->cleanup_loop_predicates(_igvn); | |
2382 #ifndef PRODUCT | |
2383 if (TraceLoopOpts) { | |
2384 tty->print_cr("PredicatesOff"); | |
2385 } | |
2386 #endif | |
2387 C->set_major_progress(); | |
2388 } | |
0 | 2389 |
2445 | 2390 // Convert scalar to superword operations at the end of all loop opts. |
0 | 2391 if (UseSuperWord && C->has_loops() && !C->major_progress()) { |
2392 // SuperWord transform | |
2393 SuperWord sw(this); | |
2394 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) { | |
2395 IdealLoopTree* lpt = iter.current(); | |
2396 if (lpt->is_counted()) { | |
2397 sw.transform_loop(lpt); | |
2398 } | |
2399 } | |
2400 } | |
2401 | |
2402 // Cleanup any modified bits | |
2403 _igvn.optimize(); | |
2404 | |
367
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
2405 // 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
|
2406 // 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
|
2407 // "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
|
2408 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
293
diff
changeset
|
2409 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
|
2410 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
|
2411 } |
0 | 2412 } |
2413 | |
2414 #ifndef PRODUCT | |
2415 //------------------------------print_statistics------------------------------- | |
2416 int PhaseIdealLoop::_loop_invokes=0;// Count of PhaseIdealLoop invokes | |
2417 int PhaseIdealLoop::_loop_work=0; // Sum of PhaseIdealLoop x unique | |
2418 void PhaseIdealLoop::print_statistics() { | |
2419 tty->print_cr("PhaseIdealLoop=%d, sum _unique=%d", _loop_invokes, _loop_work); | |
2420 } | |
2421 | |
2422 //------------------------------verify----------------------------------------- | |
2423 // Build a verify-only PhaseIdealLoop, and see that it agrees with me. | |
2424 static int fail; // debug only, so its multi-thread dont care | |
2425 void PhaseIdealLoop::verify() const { | |
2426 int old_progress = C->major_progress(); | |
2427 ResourceMark rm; | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2428 PhaseIdealLoop loop_verify( _igvn, this ); |
0 | 2429 VectorSet visited(Thread::current()->resource_area()); |
2430 | |
2431 fail = 0; | |
2432 verify_compare( C->root(), &loop_verify, visited ); | |
2433 assert( fail == 0, "verify loops failed" ); | |
2434 // Verify loop structure is the same | |
2435 _ltree_root->verify_tree(loop_verify._ltree_root, NULL); | |
2436 // Reset major-progress. It was cleared by creating a verify version of | |
2437 // PhaseIdealLoop. | |
2438 for( int i=0; i<old_progress; i++ ) | |
2439 C->set_major_progress(); | |
2440 } | |
2441 | |
2442 //------------------------------verify_compare--------------------------------- | |
2443 // Make sure me and the given PhaseIdealLoop agree on key data structures | |
2444 void PhaseIdealLoop::verify_compare( Node *n, const PhaseIdealLoop *loop_verify, VectorSet &visited ) const { | |
2445 if( !n ) return; | |
2446 if( visited.test_set( n->_idx ) ) return; | |
2447 if( !_nodes[n->_idx] ) { // Unreachable | |
2448 assert( !loop_verify->_nodes[n->_idx], "both should be unreachable" ); | |
2449 return; | |
2450 } | |
2451 | |
2452 uint i; | |
2453 for( i = 0; i < n->req(); i++ ) | |
2454 verify_compare( n->in(i), loop_verify, visited ); | |
2455 | |
2456 // Check the '_nodes' block/loop structure | |
2457 i = n->_idx; | |
2458 if( has_ctrl(n) ) { // We have control; verify has loop or ctrl | |
2459 if( _nodes[i] != loop_verify->_nodes[i] && | |
2460 get_ctrl_no_update(n) != loop_verify->get_ctrl_no_update(n) ) { | |
2461 tty->print("Mismatched control setting for: "); | |
2462 n->dump(); | |
2463 if( fail++ > 10 ) return; | |
2464 Node *c = get_ctrl_no_update(n); | |
2465 tty->print("We have it as: "); | |
2466 if( c->in(0) ) c->dump(); | |
2467 else tty->print_cr("N%d",c->_idx); | |
2468 tty->print("Verify thinks: "); | |
2469 if( loop_verify->has_ctrl(n) ) | |
2470 loop_verify->get_ctrl_no_update(n)->dump(); | |
2471 else | |
2472 loop_verify->get_loop_idx(n)->dump(); | |
2473 tty->cr(); | |
2474 } | |
2475 } else { // We have a loop | |
2476 IdealLoopTree *us = get_loop_idx(n); | |
2477 if( loop_verify->has_ctrl(n) ) { | |
2478 tty->print("Mismatched loop setting for: "); | |
2479 n->dump(); | |
2480 if( fail++ > 10 ) return; | |
2481 tty->print("We have it as: "); | |
2482 us->dump(); | |
2483 tty->print("Verify thinks: "); | |
2484 loop_verify->get_ctrl_no_update(n)->dump(); | |
2485 tty->cr(); | |
2486 } else if (!C->major_progress()) { | |
2487 // Loop selection can be messed up if we did a major progress | |
2488 // operation, like split-if. Do not verify in that case. | |
2489 IdealLoopTree *them = loop_verify->get_loop_idx(n); | |
2490 if( us->_head != them->_head || us->_tail != them->_tail ) { | |
2491 tty->print("Unequals loops for: "); | |
2492 n->dump(); | |
2493 if( fail++ > 10 ) return; | |
2494 tty->print("We have it as: "); | |
2495 us->dump(); | |
2496 tty->print("Verify thinks: "); | |
2497 them->dump(); | |
2498 tty->cr(); | |
2499 } | |
2500 } | |
2501 } | |
2502 | |
2503 // Check for immediate dominators being equal | |
2504 if( i >= _idom_size ) { | |
2505 if( !n->is_CFG() ) return; | |
2506 tty->print("CFG Node with no idom: "); | |
2507 n->dump(); | |
2508 return; | |
2509 } | |
2510 if( !n->is_CFG() ) return; | |
2511 if( n == C->root() ) return; // No IDOM here | |
2512 | |
2513 assert(n->_idx == i, "sanity"); | |
2514 Node *id = idom_no_update(n); | |
2515 if( id != loop_verify->idom_no_update(n) ) { | |
2516 tty->print("Unequals idoms for: "); | |
2517 n->dump(); | |
2518 if( fail++ > 10 ) return; | |
2519 tty->print("We have it as: "); | |
2520 id->dump(); | |
2521 tty->print("Verify thinks: "); | |
2522 loop_verify->idom_no_update(n)->dump(); | |
2523 tty->cr(); | |
2524 } | |
2525 | |
2526 } | |
2527 | |
2528 //------------------------------verify_tree------------------------------------ | |
2529 // Verify that tree structures match. Because the CFG can change, siblings | |
2530 // within the loop tree can be reordered. We attempt to deal with that by | |
2531 // reordering the verify's loop tree if possible. | |
2532 void IdealLoopTree::verify_tree(IdealLoopTree *loop, const IdealLoopTree *parent) const { | |
2533 assert( _parent == parent, "Badly formed loop tree" ); | |
2534 | |
2535 // Siblings not in same order? Attempt to re-order. | |
2536 if( _head != loop->_head ) { | |
2537 // Find _next pointer to update | |
2538 IdealLoopTree **pp = &loop->_parent->_child; | |
2539 while( *pp != loop ) | |
2540 pp = &((*pp)->_next); | |
2541 // Find proper sibling to be next | |
2542 IdealLoopTree **nn = &loop->_next; | |
2543 while( (*nn) && (*nn)->_head != _head ) | |
2544 nn = &((*nn)->_next); | |
2545 | |
2546 // Check for no match. | |
2547 if( !(*nn) ) { | |
2548 // Annoyingly, irreducible loops can pick different headers | |
2549 // after a major_progress operation, so the rest of the loop | |
2550 // tree cannot be matched. | |
2551 if (_irreducible && Compile::current()->major_progress()) return; | |
2552 assert( 0, "failed to match loop tree" ); | |
2553 } | |
2554 | |
2555 // Move (*nn) to (*pp) | |
2556 IdealLoopTree *hit = *nn; | |
2557 *nn = hit->_next; | |
2558 hit->_next = loop; | |
2559 *pp = loop; | |
2560 loop = hit; | |
2561 // Now try again to verify | |
2562 } | |
2563 | |
2564 assert( _head == loop->_head , "mismatched loop head" ); | |
2565 Node *tail = _tail; // Inline a non-updating version of | |
2566 while( !tail->in(0) ) // the 'tail()' call. | |
2567 tail = tail->in(1); | |
2568 assert( tail == loop->_tail, "mismatched loop tail" ); | |
2569 | |
2570 // Counted loops that are guarded should be able to find their guards | |
2571 if( _head->is_CountedLoop() && _head->as_CountedLoop()->is_main_loop() ) { | |
2572 CountedLoopNode *cl = _head->as_CountedLoop(); | |
2573 Node *init = cl->init_trip(); | |
2574 Node *ctrl = cl->in(LoopNode::EntryControl); | |
2575 assert( ctrl->Opcode() == Op_IfTrue || ctrl->Opcode() == Op_IfFalse, "" ); | |
2576 Node *iff = ctrl->in(0); | |
2577 assert( iff->Opcode() == Op_If, "" ); | |
2578 Node *bol = iff->in(1); | |
2579 assert( bol->Opcode() == Op_Bool, "" ); | |
2580 Node *cmp = bol->in(1); | |
2581 assert( cmp->Opcode() == Op_CmpI, "" ); | |
2582 Node *add = cmp->in(1); | |
2583 Node *opaq; | |
2584 if( add->Opcode() == Op_Opaque1 ) { | |
2585 opaq = add; | |
2586 } else { | |
2587 assert( add->Opcode() == Op_AddI || add->Opcode() == Op_ConI , "" ); | |
2588 assert( add == init, "" ); | |
2589 opaq = cmp->in(2); | |
2590 } | |
2591 assert( opaq->Opcode() == Op_Opaque1, "" ); | |
2592 | |
2593 } | |
2594 | |
2595 if (_child != NULL) _child->verify_tree(loop->_child, this); | |
2596 if (_next != NULL) _next ->verify_tree(loop->_next, parent); | |
2597 // Innermost loops need to verify loop bodies, | |
2598 // but only if no 'major_progress' | |
2599 int fail = 0; | |
2600 if (!Compile::current()->major_progress() && _child == NULL) { | |
2601 for( uint i = 0; i < _body.size(); i++ ) { | |
2602 Node *n = _body.at(i); | |
2603 if (n->outcnt() == 0) continue; // Ignore dead | |
2604 uint j; | |
2605 for( j = 0; j < loop->_body.size(); j++ ) | |
2606 if( loop->_body.at(j) == n ) | |
2607 break; | |
2608 if( j == loop->_body.size() ) { // Not found in loop body | |
2609 // Last ditch effort to avoid assertion: Its possible that we | |
2610 // have some users (so outcnt not zero) but are still dead. | |
2611 // Try to find from root. | |
2612 if (Compile::current()->root()->find(n->_idx)) { | |
2613 fail++; | |
2614 tty->print("We have that verify does not: "); | |
2615 n->dump(); | |
2616 } | |
2617 } | |
2618 } | |
2619 for( uint i2 = 0; i2 < loop->_body.size(); i2++ ) { | |
2620 Node *n = loop->_body.at(i2); | |
2621 if (n->outcnt() == 0) continue; // Ignore dead | |
2622 uint j; | |
2623 for( j = 0; j < _body.size(); j++ ) | |
2624 if( _body.at(j) == n ) | |
2625 break; | |
2626 if( j == _body.size() ) { // Not found in loop body | |
2627 // Last ditch effort to avoid assertion: Its possible that we | |
2628 // have some users (so outcnt not zero) but are still dead. | |
2629 // Try to find from root. | |
2630 if (Compile::current()->root()->find(n->_idx)) { | |
2631 fail++; | |
2632 tty->print("Verify has that we do not: "); | |
2633 n->dump(); | |
2634 } | |
2635 } | |
2636 } | |
2637 assert( !fail, "loop body mismatch" ); | |
2638 } | |
2639 } | |
2640 | |
2641 #endif | |
2642 | |
2643 //------------------------------set_idom--------------------------------------- | |
2644 void PhaseIdealLoop::set_idom(Node* d, Node* n, uint dom_depth) { | |
2645 uint idx = d->_idx; | |
2646 if (idx >= _idom_size) { | |
2647 uint newsize = _idom_size<<1; | |
2648 while( idx >= newsize ) { | |
2649 newsize <<= 1; | |
2650 } | |
2651 _idom = REALLOC_RESOURCE_ARRAY( Node*, _idom,_idom_size,newsize); | |
2652 _dom_depth = REALLOC_RESOURCE_ARRAY( uint, _dom_depth,_idom_size,newsize); | |
2653 memset( _dom_depth + _idom_size, 0, (newsize - _idom_size) * sizeof(uint) ); | |
2654 _idom_size = newsize; | |
2655 } | |
2656 _idom[idx] = n; | |
2657 _dom_depth[idx] = dom_depth; | |
2658 } | |
2659 | |
2660 //------------------------------recompute_dom_depth--------------------------------------- | |
2661 // The dominator tree is constructed with only parent pointers. | |
2662 // This recomputes the depth in the tree by first tagging all | |
2663 // nodes as "no depth yet" marker. The next pass then runs up | |
2664 // the dom tree from each node marked "no depth yet", and computes | |
2665 // the depth on the way back down. | |
2666 void PhaseIdealLoop::recompute_dom_depth() { | |
2667 uint no_depth_marker = C->unique(); | |
2668 uint i; | |
2669 // Initialize depth to "no depth yet" | |
2670 for (i = 0; i < _idom_size; i++) { | |
2671 if (_dom_depth[i] > 0 && _idom[i] != NULL) { | |
2672 _dom_depth[i] = no_depth_marker; | |
2673 } | |
2674 } | |
2675 if (_dom_stk == NULL) { | |
2676 uint init_size = C->unique() / 100; // Guess that 1/100 is a reasonable initial size. | |
2677 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
|
2678 _dom_stk = new GrowableArray<uint>(init_size); |
0 | 2679 } |
2680 // Compute new depth for each node. | |
2681 for (i = 0; i < _idom_size; i++) { | |
2682 uint j = i; | |
2683 // Run up the dom tree to find a node with a depth | |
2684 while (_dom_depth[j] == no_depth_marker) { | |
2685 _dom_stk->push(j); | |
2686 j = _idom[j]->_idx; | |
2687 } | |
2688 // Compute the depth on the way back down this tree branch | |
2689 uint dd = _dom_depth[j] + 1; | |
2690 while (_dom_stk->length() > 0) { | |
2691 uint j = _dom_stk->pop(); | |
2692 _dom_depth[j] = dd; | |
2693 dd++; | |
2694 } | |
2695 } | |
2696 } | |
2697 | |
2698 //------------------------------sort------------------------------------------- | |
2699 // Insert 'loop' into the existing loop tree. 'innermost' is a leaf of the | |
2700 // loop tree, not the root. | |
2701 IdealLoopTree *PhaseIdealLoop::sort( IdealLoopTree *loop, IdealLoopTree *innermost ) { | |
2702 if( !innermost ) return loop; // New innermost loop | |
2703 | |
2704 int loop_preorder = get_preorder(loop->_head); // Cache pre-order number | |
2705 assert( loop_preorder, "not yet post-walked loop" ); | |
2706 IdealLoopTree **pp = &innermost; // Pointer to previous next-pointer | |
2707 IdealLoopTree *l = *pp; // Do I go before or after 'l'? | |
2708 | |
2709 // Insert at start of list | |
2710 while( l ) { // Insertion sort based on pre-order | |
2711 if( l == loop ) return innermost; // Already on list! | |
2712 int l_preorder = get_preorder(l->_head); // Cache pre-order number | |
2713 assert( l_preorder, "not yet post-walked l" ); | |
2714 // Check header pre-order number to figure proper nesting | |
2715 if( loop_preorder > l_preorder ) | |
2716 break; // End of insertion | |
2717 // If headers tie (e.g., shared headers) check tail pre-order numbers. | |
2718 // Since I split shared headers, you'd think this could not happen. | |
2719 // BUT: I must first do the preorder numbering before I can discover I | |
2720 // have shared headers, so the split headers all get the same preorder | |
2721 // number as the RegionNode they split from. | |
2722 if( loop_preorder == l_preorder && | |
2723 get_preorder(loop->_tail) < get_preorder(l->_tail) ) | |
2724 break; // Also check for shared headers (same pre#) | |
2725 pp = &l->_parent; // Chain up list | |
2726 l = *pp; | |
2727 } | |
2728 // Link into list | |
2729 // Point predecessor to me | |
2730 *pp = loop; | |
2731 // Point me to successor | |
2732 IdealLoopTree *p = loop->_parent; | |
2733 loop->_parent = l; // Point me to successor | |
2734 if( p ) sort( p, innermost ); // Insert my parents into list as well | |
2735 return innermost; | |
2736 } | |
2737 | |
2738 //------------------------------build_loop_tree-------------------------------- | |
2739 // I use a modified Vick/Tarjan algorithm. I need pre- and a post- visit | |
2740 // bits. The _nodes[] array is mapped by Node index and holds a NULL for | |
2741 // not-yet-pre-walked, pre-order # for pre-but-not-post-walked and holds the | |
2742 // tightest enclosing IdealLoopTree for post-walked. | |
2743 // | |
2744 // During my forward walk I do a short 1-layer lookahead to see if I can find | |
2745 // a loop backedge with that doesn't have any work on the backedge. This | |
2746 // helps me construct nested loops with shared headers better. | |
2747 // | |
2748 // Once I've done the forward recursion, I do the post-work. For each child | |
2749 // I check to see if there is a backedge. Backedges define a loop! I | |
2750 // insert an IdealLoopTree at the target of the backedge. | |
2751 // | |
2752 // During the post-work I also check to see if I have several children | |
2753 // belonging to different loops. If so, then this Node is a decision point | |
2754 // where control flow can choose to change loop nests. It is at this | |
2755 // decision point where I can figure out how loops are nested. At this | |
2756 // time I can properly order the different loop nests from my children. | |
2757 // Note that there may not be any backedges at the decision point! | |
2758 // | |
2759 // Since the decision point can be far removed from the backedges, I can't | |
2760 // order my loops at the time I discover them. Thus at the decision point | |
2761 // I need to inspect loop header pre-order numbers to properly nest my | |
2762 // loops. This means I need to sort my childrens' loops by pre-order. | |
2763 // The sort is of size number-of-control-children, which generally limits | |
2764 // it to size 2 (i.e., I just choose between my 2 target loops). | |
2765 void PhaseIdealLoop::build_loop_tree() { | |
2766 // Allocate stack of size C->unique()/2 to avoid frequent realloc | |
2767 GrowableArray <Node *> bltstack(C->unique() >> 1); | |
2768 Node *n = C->root(); | |
2769 bltstack.push(n); | |
2770 int pre_order = 1; | |
2771 int stack_size; | |
2772 | |
2773 while ( ( stack_size = bltstack.length() ) != 0 ) { | |
2774 n = bltstack.top(); // Leave node on stack | |
2775 if ( !is_visited(n) ) { | |
2776 // ---- Pre-pass Work ---- | |
2777 // Pre-walked but not post-walked nodes need a pre_order number. | |
2778 | |
2779 set_preorder_visited( n, pre_order ); // set as visited | |
2780 | |
2781 // ---- Scan over children ---- | |
2782 // Scan first over control projections that lead to loop headers. | |
2783 // This helps us find inner-to-outer loops with shared headers better. | |
2784 | |
2785 // Scan children's children for loop headers. | |
2786 for ( int i = n->outcnt() - 1; i >= 0; --i ) { | |
2787 Node* m = n->raw_out(i); // Child | |
2788 if( m->is_CFG() && !is_visited(m) ) { // Only for CFG children | |
2789 // Scan over children's children to find loop | |
2790 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
2791 Node* l = m->fast_out(j); | |
2792 if( is_visited(l) && // Been visited? | |
2793 !is_postvisited(l) && // But not post-visited | |
2794 get_preorder(l) < pre_order ) { // And smaller pre-order | |
2795 // Found! Scan the DFS down this path before doing other paths | |
2796 bltstack.push(m); | |
2797 break; | |
2798 } | |
2799 } | |
2800 } | |
2801 } | |
2802 pre_order++; | |
2803 } | |
2804 else if ( !is_postvisited(n) ) { | |
2805 // Note: build_loop_tree_impl() adds out edges on rare occasions, | |
2806 // such as com.sun.rsasign.am::a. | |
2807 // For non-recursive version, first, process current children. | |
2808 // On next iteration, check if additional children were added. | |
2809 for ( int k = n->outcnt() - 1; k >= 0; --k ) { | |
2810 Node* u = n->raw_out(k); | |
2811 if ( u->is_CFG() && !is_visited(u) ) { | |
2812 bltstack.push(u); | |
2813 } | |
2814 } | |
2815 if ( bltstack.length() == stack_size ) { | |
2816 // There were no additional children, post visit node now | |
2817 (void)bltstack.pop(); // Remove node from stack | |
2818 pre_order = build_loop_tree_impl( n, pre_order ); | |
2819 // Check for bailout | |
2820 if (C->failing()) { | |
2821 return; | |
2822 } | |
2823 // Check to grow _preorders[] array for the case when | |
2824 // build_loop_tree_impl() adds new nodes. | |
2825 check_grow_preorders(); | |
2826 } | |
2827 } | |
2828 else { | |
2829 (void)bltstack.pop(); // Remove post-visited node from stack | |
2830 } | |
2831 } | |
2832 } | |
2833 | |
2834 //------------------------------build_loop_tree_impl--------------------------- | |
2835 int PhaseIdealLoop::build_loop_tree_impl( Node *n, int pre_order ) { | |
2836 // ---- Post-pass Work ---- | |
2837 // Pre-walked but not post-walked nodes need a pre_order number. | |
2838 | |
2839 // Tightest enclosing loop for this Node | |
2840 IdealLoopTree *innermost = NULL; | |
2841 | |
2842 // For all children, see if any edge is a backedge. If so, make a loop | |
2843 // for it. Then find the tightest enclosing loop for the self Node. | |
2844 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2845 Node* m = n->fast_out(i); // Child | |
2846 if( n == m ) continue; // Ignore control self-cycles | |
2847 if( !m->is_CFG() ) continue;// Ignore non-CFG edges | |
2848 | |
2849 IdealLoopTree *l; // Child's loop | |
2850 if( !is_postvisited(m) ) { // Child visited but not post-visited? | |
2851 // Found a backedge | |
2852 assert( get_preorder(m) < pre_order, "should be backedge" ); | |
2853 // Check for the RootNode, which is already a LoopNode and is allowed | |
2854 // to have multiple "backedges". | |
2855 if( m == C->root()) { // Found the root? | |
2856 l = _ltree_root; // Root is the outermost LoopNode | |
2857 } else { // Else found a nested loop | |
2858 // Insert a LoopNode to mark this loop. | |
2859 l = new IdealLoopTree(this, m, n); | |
2860 } // End of Else found a nested loop | |
2861 if( !has_loop(m) ) // If 'm' does not already have a loop set | |
2862 set_loop(m, l); // Set loop header to loop now | |
2863 | |
2864 } else { // Else not a nested loop | |
2865 if( !_nodes[m->_idx] ) continue; // Dead code has no loop | |
2866 l = get_loop(m); // Get previously determined loop | |
2867 // If successor is header of a loop (nest), move up-loop till it | |
2868 // is a member of some outer enclosing loop. Since there are no | |
2869 // shared headers (I've split them already) I only need to go up | |
2870 // at most 1 level. | |
2871 while( l && l->_head == m ) // Successor heads loop? | |
2872 l = l->_parent; // Move up 1 for me | |
2873 // If this loop is not properly parented, then this loop | |
2874 // has no exit path out, i.e. its an infinite loop. | |
2875 if( !l ) { | |
2876 // Make loop "reachable" from root so the CFG is reachable. Basically | |
2877 // insert a bogus loop exit that is never taken. 'm', the loop head, | |
2878 // points to 'n', one (of possibly many) fall-in paths. There may be | |
2879 // many backedges as well. | |
2880 | |
2881 // Here I set the loop to be the root loop. I could have, after | |
2882 // inserting a bogus loop exit, restarted the recursion and found my | |
2883 // new loop exit. This would make the infinite loop a first-class | |
2884 // loop and it would then get properly optimized. What's the use of | |
2885 // optimizing an infinite loop? | |
2886 l = _ltree_root; // Oops, found infinite loop | |
2887 | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2888 if (!_verify_only) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2889 // 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
|
2890 NeverBranchNode *iff = new (C) NeverBranchNode( m ); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2891 _igvn.register_new_node_with_optimizer(iff); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2892 set_loop(iff, l); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
2893 Node *if_t = new (C) CProjNode( iff, 0 ); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2894 _igvn.register_new_node_with_optimizer(if_t); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2895 set_loop(if_t, l); |
0 | 2896 |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2897 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
|
2898 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
|
2899 Node* x = m->fast_out(j); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2900 if (x->is_CFG() && x != m && x != iff) |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2901 { cfg = x; break; } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2902 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2903 assert(cfg != NULL, "must find the control user of m"); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2904 uint k = 0; // Probably cfg->in(0) |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2905 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
|
2906 cfg->set_req( k, if_t ); // Now point to NeverBranch |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2907 |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2908 // 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
|
2909 Node *if_f = new (C) CProjNode( iff, 1 ); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2910 _igvn.register_new_node_with_optimizer(if_f); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2911 set_loop(if_f, l); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2912 // Find frame ptr for Halt. Relies on the optimizer |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2913 // V-N'ing. Easier and quicker than searching through |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2914 // the program structure. |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
2915 Node *frame = new (C) ParmNode( C->start(), TypeFunc::FramePtr ); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2916 _igvn.register_new_node_with_optimizer(frame); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2917 // Halt & Catch Fire |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6636
diff
changeset
|
2918 Node *halt = new (C) HaltNode( if_f, frame ); |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2919 _igvn.register_new_node_with_optimizer(halt); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2920 set_loop(halt, l); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2921 C->root()->add_req(halt); |
0 | 2922 } |
2923 set_loop(C->root(), _ltree_root); | |
2924 } | |
2925 } | |
2926 // Weeny check for irreducible. This child was already visited (this | |
2927 // IS the post-work phase). Is this child's loop header post-visited | |
2928 // 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
|
2929 if (!_verify_only) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2930 while( is_postvisited(l->_head) ) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2931 // found irreducible |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2932 l->_irreducible = 1; // = true |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2933 l = l->_parent; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2934 _has_irreducible_loops = true; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2935 // 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
|
2936 if (l == NULL) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2937 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
|
2938 return pre_order; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
2939 } |
0 | 2940 } |
2941 } | |
2942 | |
2943 // This Node might be a decision point for loops. It is only if | |
2944 // it's children belong to several different loops. The sort call | |
2945 // does a trivial amount of work if there is only 1 child or all | |
2946 // children belong to the same loop. If however, the children | |
2947 // belong to different loops, the sort call will properly set the | |
2948 // _parent pointers to show how the loops nest. | |
2949 // | |
2950 // In any case, it returns the tightest enclosing loop. | |
2951 innermost = sort( l, innermost ); | |
2952 } | |
2953 | |
2954 // Def-use info will have some dead stuff; dead stuff will have no | |
2955 // loop decided on. | |
2956 | |
2957 // Am I a loop header? If so fix up my parent's child and next ptrs. | |
2958 if( innermost && innermost->_head == n ) { | |
2959 assert( get_loop(n) == innermost, "" ); | |
2960 IdealLoopTree *p = innermost->_parent; | |
2961 IdealLoopTree *l = innermost; | |
2962 while( p && l->_head == n ) { | |
2963 l->_next = p->_child; // Put self on parents 'next child' | |
2964 p->_child = l; // Make self as first child of parent | |
2965 l = p; // Now walk up the parent chain | |
2966 p = l->_parent; | |
2967 } | |
2968 } else { | |
2969 // Note that it is possible for a LoopNode to reach here, if the | |
2970 // backedge has been made unreachable (hence the LoopNode no longer | |
2971 // denotes a Loop, and will eventually be removed). | |
2972 | |
2973 // Record tightest enclosing loop for self. Mark as post-visited. | |
2974 set_loop(n, innermost); | |
2975 // Also record has_call flag early on | |
2976 if( innermost ) { | |
2977 if( n->is_Call() && !n->is_CallLeaf() && !n->is_macro() ) { | |
2978 // Do not count uncommon calls | |
2979 if( !n->is_CallStaticJava() || !n->as_CallStaticJava()->_name ) { | |
2980 Node *iff = n->in(0)->in(0); | |
6179
8c92982cbbc4
7119644: Increase superword's vector size up to 256 bits
kvn
parents:
6144
diff
changeset
|
2981 // No any calls for vectorized loops. |
8c92982cbbc4
7119644: Increase superword's vector size up to 256 bits
kvn
parents:
6144
diff
changeset
|
2982 if( UseSuperWord || !iff->is_If() || |
0 | 2983 (n->in(0)->Opcode() == Op_IfFalse && |
2984 (1.0 - iff->as_If()->_prob) >= 0.01) || | |
2985 (iff->as_If()->_prob >= 0.01) ) | |
2986 innermost->_has_call = 1; | |
2987 } | |
39
76256d272075
6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation
kvn
parents:
17
diff
changeset
|
2988 } 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
|
2989 // 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
|
2990 // 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
|
2991 // 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
|
2992 innermost->_allow_optimizations = false; |
76256d272075
6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation
kvn
parents:
17
diff
changeset
|
2993 innermost->_has_call = 1; // = true |
6636 | 2994 } else if (n->Opcode() == Op_SafePoint) { |
2995 // Record all safepoints in this loop. | |
2996 if (innermost->_safepts == NULL) innermost->_safepts = new Node_List(); | |
2997 innermost->_safepts->push(n); | |
0 | 2998 } |
2999 } | |
3000 } | |
3001 | |
3002 // Flag as post-visited now | |
3003 set_postvisited(n); | |
3004 return pre_order; | |
3005 } | |
3006 | |
3007 | |
3008 //------------------------------build_loop_early------------------------------- | |
3009 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
3010 // First pass computes the earliest controlling node possible. This is the | |
3011 // controlling input with the deepest dominating depth. | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3012 void PhaseIdealLoop::build_loop_early( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) { |
0 | 3013 while (worklist.size() != 0) { |
3014 // Use local variables nstack_top_n & nstack_top_i to cache values | |
3015 // on nstack's top. | |
3016 Node *nstack_top_n = worklist.pop(); | |
3017 uint nstack_top_i = 0; | |
3018 //while_nstack_nonempty: | |
3019 while (true) { | |
3020 // Get parent node and next input's index from stack's top. | |
3021 Node *n = nstack_top_n; | |
3022 uint i = nstack_top_i; | |
3023 uint cnt = n->req(); // Count of inputs | |
3024 if (i == 0) { // Pre-process the node. | |
3025 if( has_node(n) && // Have either loop or control already? | |
3026 !has_ctrl(n) ) { // Have loop picked out already? | |
3027 // During "merge_many_backedges" we fold up several nested loops | |
3028 // into a single loop. This makes the members of the original | |
3029 // loop bodies pointing to dead loops; they need to move up | |
3030 // to the new UNION'd larger loop. I set the _head field of these | |
3031 // dead loops to NULL and the _parent field points to the owning | |
3032 // loop. Shades of UNION-FIND algorithm. | |
3033 IdealLoopTree *ilt; | |
3034 while( !(ilt = get_loop(n))->_head ) { | |
3035 // Normally I would use a set_loop here. But in this one special | |
3036 // case, it is legal (and expected) to change what loop a Node | |
3037 // belongs to. | |
3038 _nodes.map(n->_idx, (Node*)(ilt->_parent) ); | |
3039 } | |
3040 // Remove safepoints ONLY if I've already seen I don't need one. | |
3041 // (the old code here would yank a 2nd safepoint after seeing a | |
3042 // first one, even though the 1st did not dominate in the loop body | |
3043 // and thus could be avoided indefinitely) | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3044 if( !_verify_only && !_verify_me && ilt->_has_sfpt && n->Opcode() == Op_SafePoint && |
0 | 3045 is_deleteable_safept(n)) { |
3046 Node *in = n->in(TypeFunc::Control); | |
3047 lazy_replace(n,in); // Pull safepoint now | |
6636 | 3048 if (ilt->_safepts != NULL) { |
3049 ilt->_safepts->yank(n); | |
3050 } | |
0 | 3051 // Carry on with the recursion "as if" we are walking |
3052 // only the control input | |
3053 if( !visited.test_set( in->_idx ) ) { | |
3054 worklist.push(in); // Visit this guy later, using worklist | |
3055 } | |
3056 // Get next node from nstack: | |
3057 // - skip n's inputs processing by setting i > cnt; | |
3058 // - we also will not call set_early_ctrl(n) since | |
3059 // has_node(n) == true (see the condition above). | |
3060 i = cnt + 1; | |
3061 } | |
3062 } | |
3063 } // if (i == 0) | |
3064 | |
3065 // Visit all inputs | |
3066 bool done = true; // Assume all n's inputs will be processed | |
3067 while (i < cnt) { | |
3068 Node *in = n->in(i); | |
3069 ++i; | |
3070 if (in == NULL) continue; | |
3071 if (in->pinned() && !in->is_CFG()) | |
3072 set_ctrl(in, in->in(0)); | |
3073 int is_visited = visited.test_set( in->_idx ); | |
3074 if (!has_node(in)) { // No controlling input yet? | |
3075 assert( !in->is_CFG(), "CFG Node with no controlling input?" ); | |
3076 assert( !is_visited, "visit only once" ); | |
3077 nstack.push(n, i); // Save parent node and next input's index. | |
3078 nstack_top_n = in; // Process current input now. | |
3079 nstack_top_i = 0; | |
3080 done = false; // Not all n's inputs processed. | |
3081 break; // continue while_nstack_nonempty; | |
3082 } else if (!is_visited) { | |
3083 // This guy has a location picked out for him, but has not yet | |
3084 // been visited. Happens to all CFG nodes, for instance. | |
3085 // Visit him using the worklist instead of recursion, to break | |
3086 // cycles. Since he has a location already we do not need to | |
3087 // find his location before proceeding with the current Node. | |
3088 worklist.push(in); // Visit this guy later, using worklist | |
3089 } | |
3090 } | |
3091 if (done) { | |
3092 // All of n's inputs have been processed, complete post-processing. | |
3093 | |
605 | 3094 // Compute earliest point this Node can go. |
0 | 3095 // CFG, Phi, pinned nodes already know their controlling input. |
3096 if (!has_node(n)) { | |
3097 // Record earliest legal location | |
3098 set_early_ctrl( n ); | |
3099 } | |
3100 if (nstack.is_empty()) { | |
3101 // Finished all nodes on stack. | |
3102 // Process next node on the worklist. | |
3103 break; | |
3104 } | |
3105 // Get saved parent node and next input's index. | |
3106 nstack_top_n = nstack.node(); | |
3107 nstack_top_i = nstack.index(); | |
3108 nstack.pop(); | |
3109 } | |
3110 } // while (true) | |
3111 } | |
3112 } | |
3113 | |
3114 //------------------------------dom_lca_internal-------------------------------- | |
3115 // Pair-wise LCA | |
3116 Node *PhaseIdealLoop::dom_lca_internal( Node *n1, Node *n2 ) const { | |
3117 if( !n1 ) return n2; // Handle NULL original LCA | |
3118 assert( n1->is_CFG(), "" ); | |
3119 assert( n2->is_CFG(), "" ); | |
3120 // find LCA of all uses | |
3121 uint d1 = dom_depth(n1); | |
3122 uint d2 = dom_depth(n2); | |
3123 while (n1 != n2) { | |
3124 if (d1 > d2) { | |
3125 n1 = idom(n1); | |
3126 d1 = dom_depth(n1); | |
3127 } else if (d1 < d2) { | |
3128 n2 = idom(n2); | |
3129 d2 = dom_depth(n2); | |
3130 } else { | |
3131 // Here d1 == d2. Due to edits of the dominator-tree, sections | |
3132 // of the tree might have the same depth. These sections have | |
3133 // to be searched more carefully. | |
3134 | |
3135 // Scan up all the n1's with equal depth, looking for n2. | |
3136 Node *t1 = idom(n1); | |
3137 while (dom_depth(t1) == d1) { | |
3138 if (t1 == n2) return n2; | |
3139 t1 = idom(t1); | |
3140 } | |
3141 // Scan up all the n2's with equal depth, looking for n1. | |
3142 Node *t2 = idom(n2); | |
3143 while (dom_depth(t2) == d2) { | |
3144 if (t2 == n1) return n1; | |
3145 t2 = idom(t2); | |
3146 } | |
3147 // Move up to a new dominator-depth value as well as up the dom-tree. | |
3148 n1 = t1; | |
3149 n2 = t2; | |
3150 d1 = dom_depth(n1); | |
3151 d2 = dom_depth(n2); | |
3152 } | |
3153 } | |
3154 return n1; | |
3155 } | |
3156 | |
3157 //------------------------------compute_idom----------------------------------- | |
3158 // Locally compute IDOM using dom_lca call. Correct only if the incoming | |
3159 // IDOMs are correct. | |
3160 Node *PhaseIdealLoop::compute_idom( Node *region ) const { | |
3161 assert( region->is_Region(), "" ); | |
3162 Node *LCA = NULL; | |
3163 for( uint i = 1; i < region->req(); i++ ) { | |
3164 if( region->in(i) != C->top() ) | |
3165 LCA = dom_lca( LCA, region->in(i) ); | |
3166 } | |
3167 return LCA; | |
3168 } | |
3169 | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3170 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
|
3171 bool had_error = false; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3172 #ifdef ASSERT |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3173 if (early != C->root()) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3174 // Make sure that there's a dominance path from use to LCA |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3175 Node* d = use; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3176 while (d != LCA) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3177 d = idom(d); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3178 if (d == C->root()) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3179 tty->print_cr("*** Use %d isn't dominated by def %s", use->_idx, n->_idx); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3180 n->dump(); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3181 use->dump(); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3182 had_error = true; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3183 break; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3184 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3185 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3186 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3187 #endif |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3188 return had_error; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3189 } |
0 | 3190 |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3191 |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3192 Node* PhaseIdealLoop::compute_lca_of_uses(Node* n, Node* early, bool verify) { |
0 | 3193 // Compute LCA over list of uses |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3194 bool had_error = false; |
0 | 3195 Node *LCA = NULL; |
3196 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax && LCA != early; i++) { | |
3197 Node* c = n->fast_out(i); | |
3198 if (_nodes[c->_idx] == NULL) | |
3199 continue; // Skip the occasional dead node | |
3200 if( c->is_Phi() ) { // For Phis, we must land above on the path | |
3201 for( uint j=1; j<c->req(); j++ ) {// For all inputs | |
3202 if( c->in(j) == n ) { // Found matching input? | |
3203 Node *use = c->in(0)->in(j); | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3204 if (_verify_only && use->is_top()) continue; |
0 | 3205 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
|
3206 if (verify) had_error = verify_dominance(n, use, LCA, early) || had_error; |
0 | 3207 } |
3208 } | |
3209 } else { | |
3210 // For CFG data-users, use is in the block just prior | |
3211 Node *use = has_ctrl(c) ? get_ctrl(c) : c->in(0); | |
3212 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
|
3213 if (verify) had_error = verify_dominance(n, use, LCA, early) || had_error; |
0 | 3214 } |
3215 } | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3216 assert(!had_error, "bad dominance"); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3217 return LCA; |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3218 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3219 |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3220 //------------------------------get_late_ctrl---------------------------------- |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3221 // Compute latest legal control. |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3222 Node *PhaseIdealLoop::get_late_ctrl( Node *n, Node *early ) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3223 assert(early != NULL, "early control should not be NULL"); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3224 |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3225 Node* LCA = compute_lca_of_uses(n, early); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3226 #ifdef ASSERT |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3227 if (LCA == C->root() && LCA != early) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3228 // 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
|
3229 compute_lca_of_uses(n, early, true); |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3230 } |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3231 #endif |
0 | 3232 |
3233 // if this is a load, check for anti-dependent stores | |
3234 // We use a conservative algorithm to identify potential interfering | |
3235 // instructions and for rescheduling the load. The users of the memory | |
3236 // input of this load are examined. Any use which is not a load and is | |
3237 // dominated by early is considered a potentially interfering store. | |
3238 // This can produce false positives. | |
3239 if (n->is_Load() && LCA != early) { | |
3240 Node_List worklist; | |
3241 | |
3242 Node *mem = n->in(MemNode::Memory); | |
3243 for (DUIterator_Fast imax, i = mem->fast_outs(imax); i < imax; i++) { | |
3244 Node* s = mem->fast_out(i); | |
3245 worklist.push(s); | |
3246 } | |
3247 while(worklist.size() != 0 && LCA != early) { | |
3248 Node* s = worklist.pop(); | |
3249 if (s->is_Load()) { | |
3250 continue; | |
3251 } else if (s->is_MergeMem()) { | |
3252 for (DUIterator_Fast imax, i = s->fast_outs(imax); i < imax; i++) { | |
3253 Node* s1 = s->fast_out(i); | |
3254 worklist.push(s1); | |
3255 } | |
3256 } else { | |
3257 Node *sctrl = has_ctrl(s) ? get_ctrl(s) : s->in(0); | |
3258 assert(sctrl != NULL || s->outcnt() == 0, "must have control"); | |
3259 if (sctrl != NULL && !sctrl->is_top() && is_dominator(early, sctrl)) { | |
3260 LCA = dom_lca_for_get_late_ctrl(LCA, sctrl, n); | |
3261 } | |
3262 } | |
3263 } | |
3264 } | |
3265 | |
3266 assert(LCA == find_non_split_ctrl(LCA), "unexpected late control"); | |
3267 return LCA; | |
3268 } | |
3269 | |
3270 // true if CFG node d dominates CFG node n | |
3271 bool PhaseIdealLoop::is_dominator(Node *d, Node *n) { | |
3272 if (d == n) | |
3273 return true; | |
3274 assert(d->is_CFG() && n->is_CFG(), "must have CFG nodes"); | |
3275 uint dd = dom_depth(d); | |
3276 while (dom_depth(n) >= dd) { | |
3277 if (n == d) | |
3278 return true; | |
3279 n = idom(n); | |
3280 } | |
3281 return false; | |
3282 } | |
3283 | |
3284 //------------------------------dom_lca_for_get_late_ctrl_internal------------- | |
3285 // Pair-wise LCA with tags. | |
3286 // Tag each index with the node 'tag' currently being processed | |
3287 // before advancing up the dominator chain using idom(). | |
3288 // Later calls that find a match to 'tag' know that this path has already | |
3289 // been considered in the current LCA (which is input 'n1' by convention). | |
3290 // Since get_late_ctrl() is only called once for each node, the tag array | |
3291 // does not need to be cleared between calls to get_late_ctrl(). | |
3292 // Algorithm trades a larger constant factor for better asymptotic behavior | |
3293 // | |
3294 Node *PhaseIdealLoop::dom_lca_for_get_late_ctrl_internal( Node *n1, Node *n2, Node *tag ) { | |
3295 uint d1 = dom_depth(n1); | |
3296 uint d2 = dom_depth(n2); | |
3297 | |
3298 do { | |
3299 if (d1 > d2) { | |
3300 // current lca is deeper than n2 | |
3301 _dom_lca_tags.map(n1->_idx, tag); | |
3302 n1 = idom(n1); | |
3303 d1 = dom_depth(n1); | |
3304 } else if (d1 < d2) { | |
3305 // n2 is deeper than current lca | |
3306 Node *memo = _dom_lca_tags[n2->_idx]; | |
3307 if( memo == tag ) { | |
3308 return n1; // Return the current LCA | |
3309 } | |
3310 _dom_lca_tags.map(n2->_idx, tag); | |
3311 n2 = idom(n2); | |
3312 d2 = dom_depth(n2); | |
3313 } else { | |
3314 // Here d1 == d2. Due to edits of the dominator-tree, sections | |
3315 // of the tree might have the same depth. These sections have | |
3316 // to be searched more carefully. | |
3317 | |
3318 // Scan up all the n1's with equal depth, looking for n2. | |
3319 _dom_lca_tags.map(n1->_idx, tag); | |
3320 Node *t1 = idom(n1); | |
3321 while (dom_depth(t1) == d1) { | |
3322 if (t1 == n2) return n2; | |
3323 _dom_lca_tags.map(t1->_idx, tag); | |
3324 t1 = idom(t1); | |
3325 } | |
3326 // Scan up all the n2's with equal depth, looking for n1. | |
3327 _dom_lca_tags.map(n2->_idx, tag); | |
3328 Node *t2 = idom(n2); | |
3329 while (dom_depth(t2) == d2) { | |
3330 if (t2 == n1) return n1; | |
3331 _dom_lca_tags.map(t2->_idx, tag); | |
3332 t2 = idom(t2); | |
3333 } | |
3334 // Move up to a new dominator-depth value as well as up the dom-tree. | |
3335 n1 = t1; | |
3336 n2 = t2; | |
3337 d1 = dom_depth(n1); | |
3338 d2 = dom_depth(n2); | |
3339 } | |
3340 } while (n1 != n2); | |
3341 return n1; | |
3342 } | |
3343 | |
3344 //------------------------------init_dom_lca_tags------------------------------ | |
3345 // Tag could be a node's integer index, 32bits instead of 64bits in some cases | |
3346 // Intended use does not involve any growth for the array, so it could | |
3347 // be of fixed size. | |
3348 void PhaseIdealLoop::init_dom_lca_tags() { | |
3349 uint limit = C->unique() + 1; | |
3350 _dom_lca_tags.map( limit, NULL ); | |
3351 #ifdef ASSERT | |
3352 for( uint i = 0; i < limit; ++i ) { | |
3353 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer"); | |
3354 } | |
3355 #endif // ASSERT | |
3356 } | |
3357 | |
3358 //------------------------------clear_dom_lca_tags------------------------------ | |
3359 // Tag could be a node's integer index, 32bits instead of 64bits in some cases | |
3360 // Intended use does not involve any growth for the array, so it could | |
3361 // be of fixed size. | |
3362 void PhaseIdealLoop::clear_dom_lca_tags() { | |
3363 uint limit = C->unique() + 1; | |
3364 _dom_lca_tags.map( limit, NULL ); | |
3365 _dom_lca_tags.clear(); | |
3366 #ifdef ASSERT | |
3367 for( uint i = 0; i < limit; ++i ) { | |
3368 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer"); | |
3369 } | |
3370 #endif // ASSERT | |
3371 } | |
3372 | |
3373 //------------------------------build_loop_late-------------------------------- | |
3374 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
3375 // 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
|
3376 void PhaseIdealLoop::build_loop_late( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) { |
0 | 3377 while (worklist.size() != 0) { |
3378 Node *n = worklist.pop(); | |
3379 // Only visit once | |
3380 if (visited.test_set(n->_idx)) continue; | |
3381 uint cnt = n->outcnt(); | |
3382 uint i = 0; | |
3383 while (true) { | |
3384 assert( _nodes[n->_idx], "no dead nodes" ); | |
3385 // Visit all children | |
3386 if (i < cnt) { | |
3387 Node* use = n->raw_out(i); | |
3388 ++i; | |
3389 // Check for dead uses. Aggressively prune such junk. It might be | |
3390 // dead in the global sense, but still have local uses so I cannot | |
3391 // easily call 'remove_dead_node'. | |
3392 if( _nodes[use->_idx] != NULL || use->is_top() ) { // Not dead? | |
3393 // Due to cycles, we might not hit the same fixed point in the verify | |
3394 // pass as we do in the regular pass. Instead, visit such phis as | |
3395 // simple uses of the loop head. | |
3396 if( use->in(0) && (use->is_CFG() || use->is_Phi()) ) { | |
3397 if( !visited.test(use->_idx) ) | |
3398 worklist.push(use); | |
3399 } else if( !visited.test_set(use->_idx) ) { | |
3400 nstack.push(n, i); // Save parent and next use's index. | |
3401 n = use; // Process all children of current use. | |
3402 cnt = use->outcnt(); | |
3403 i = 0; | |
3404 } | |
3405 } else { | |
3406 // Do not visit around the backedge of loops via data edges. | |
3407 // push dead code onto a worklist | |
3408 _deadlist.push(use); | |
3409 } | |
3410 } else { | |
3411 // 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
|
3412 build_loop_late_post(n); |
0 | 3413 if (nstack.is_empty()) { |
3414 // Finished all nodes on stack. | |
3415 // Process next node on the worklist. | |
3416 break; | |
3417 } | |
3418 // Get saved parent node and next use's index. Visit the rest of uses. | |
3419 n = nstack.node(); | |
3420 cnt = n->outcnt(); | |
3421 i = nstack.index(); | |
3422 nstack.pop(); | |
3423 } | |
3424 } | |
3425 } | |
3426 } | |
3427 | |
3428 //------------------------------build_loop_late_post--------------------------- | |
3429 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
3430 // 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
|
3431 void PhaseIdealLoop::build_loop_late_post( Node *n ) { |
0 | 3432 |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3433 if (n->req() == 2 && n->Opcode() == Op_ConvI2L && !C->major_progress() && !_verify_only) { |
0 | 3434 _igvn._worklist.push(n); // Maybe we'll normalize it, if no more loops. |
3435 } | |
3436 | |
3437 // CFG and pinned nodes already handled | |
3438 if( n->in(0) ) { | |
3439 if( n->in(0)->is_top() ) return; // Dead? | |
3440 | |
3441 // We'd like +VerifyLoopOptimizations to not believe that Mod's/Loads | |
3442 // _must_ be pinned (they have to observe their control edge of course). | |
3443 // Unlike Stores (which modify an unallocable resource, the memory | |
3444 // state), Mods/Loads can float around. So free them up. | |
3445 bool pinned = true; | |
3446 switch( n->Opcode() ) { | |
3447 case Op_DivI: | |
3448 case Op_DivF: | |
3449 case Op_DivD: | |
3450 case Op_ModI: | |
3451 case Op_ModF: | |
3452 case Op_ModD: | |
3453 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
|
3454 case Op_LoadUB: // during loop optimizations. |
8c92982cbbc4
7119644: Increase superword's vector size up to 256 bits
kvn
parents:
6144
diff
changeset
|
3455 case Op_LoadUS: |
0 | 3456 case Op_LoadD: |
3457 case Op_LoadF: | |
3458 case Op_LoadI: | |
3459 case Op_LoadKlass: | |
293
c3e045194476
6731641: assert(m->adr_type() == mach->adr_type(),"matcher should not change adr type")
kvn
parents:
235
diff
changeset
|
3460 case Op_LoadNKlass: |
0 | 3461 case Op_LoadL: |
3462 case Op_LoadS: | |
3463 case Op_LoadP: | |
293
c3e045194476
6731641: assert(m->adr_type() == mach->adr_type(),"matcher should not change adr type")
kvn
parents:
235
diff
changeset
|
3464 case Op_LoadN: |
0 | 3465 case Op_LoadRange: |
3466 case Op_LoadD_unaligned: | |
3467 case Op_LoadL_unaligned: | |
3468 case Op_StrComp: // Does a bunch of load-like effects | |
681 | 3469 case Op_StrEquals: |
3470 case Op_StrIndexOf: | |
169
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
39
diff
changeset
|
3471 case Op_AryEq: |
0 | 3472 pinned = false; |
3473 } | |
3474 if( pinned ) { | |
605 | 3475 IdealLoopTree *chosen_loop = get_loop(n->is_CFG() ? n : get_ctrl(n)); |
3476 if( !chosen_loop->_child ) // Inner loop? | |
3477 chosen_loop->_body.push(n); // Collect inner loops | |
0 | 3478 return; |
3479 } | |
3480 } else { // No slot zero | |
3481 if( n->is_CFG() ) { // CFG with no slot 0 is dead | |
3482 _nodes.map(n->_idx,0); // No block setting, it's globally dead | |
3483 return; | |
3484 } | |
3485 assert(!n->is_CFG() || n->outcnt() == 0, ""); | |
3486 } | |
3487 | |
3488 // Do I have a "safe range" I can select over? | |
3489 Node *early = get_ctrl(n);// Early location already computed | |
3490 | |
3491 // Compute latest point this Node can go | |
3492 Node *LCA = get_late_ctrl( n, early ); | |
3493 // LCA is NULL due to uses being dead | |
3494 if( LCA == NULL ) { | |
3495 #ifdef ASSERT | |
3496 for (DUIterator i1 = n->outs(); n->has_out(i1); i1++) { | |
3497 assert( _nodes[n->out(i1)->_idx] == NULL, "all uses must also be dead"); | |
3498 } | |
3499 #endif | |
3500 _nodes.map(n->_idx, 0); // This node is useless | |
3501 _deadlist.push(n); | |
3502 return; | |
3503 } | |
3504 assert(LCA != NULL && !LCA->is_top(), "no dead nodes"); | |
3505 | |
3506 Node *legal = LCA; // Walk 'legal' up the IDOM chain | |
3507 Node *least = legal; // Best legal position so far | |
3508 while( early != legal ) { // While not at earliest legal | |
1172 | 3509 #ifdef ASSERT |
3510 if (legal->is_Start() && !early->is_Root()) { | |
3511 // 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
|
3512 dump_bad_graph("Bad graph detected in build_loop_late", n, early, LCA); |
1172 | 3513 assert(false, "Bad graph detected in build_loop_late"); |
3514 } | |
3515 #endif | |
0 | 3516 // Find least loop nesting depth |
3517 legal = idom(legal); // Bump up the IDOM tree | |
3518 // Check for lower nesting depth | |
3519 if( get_loop(legal)->_nest < get_loop(least)->_nest ) | |
3520 least = legal; | |
3521 } | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3522 assert(early == legal || legal != C->root(), "bad dominance of inputs"); |
0 | 3523 |
3524 // Try not to place code on a loop entry projection | |
3525 // which can inhibit range check elimination. | |
3526 if (least != early) { | |
3527 Node* ctrl_out = least->unique_ctrl_out(); | |
3528 if (ctrl_out && ctrl_out->is_CountedLoop() && | |
3529 least == ctrl_out->in(LoopNode::EntryControl)) { | |
3530 Node* least_dom = idom(least); | |
3531 if (get_loop(least_dom)->is_member(get_loop(least))) { | |
3532 least = least_dom; | |
3533 } | |
3534 } | |
3535 } | |
3536 | |
3537 #ifdef ASSERT | |
3538 // If verifying, verify that 'verify_me' has a legal location | |
3539 // and choose it as our location. | |
921
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3540 if( _verify_me ) { |
046932b72aa2
6862956: PhaseIdealLoop should have a CFG verification mode
never
parents:
681
diff
changeset
|
3541 Node *v_ctrl = _verify_me->get_ctrl_no_update(n); |
0 | 3542 Node *legal = LCA; |
3543 while( early != legal ) { // While not at earliest legal | |
3544 if( legal == v_ctrl ) break; // Check for prior good location | |
3545 legal = idom(legal) ;// Bump up the IDOM tree | |
3546 } | |
3547 // Check for prior good location | |
3548 if( legal == v_ctrl ) least = legal; // Keep prior if found | |
3549 } | |
3550 #endif | |
3551 | |
3552 // Assign discovered "here or above" point | |
3553 least = find_non_split_ctrl(least); | |
3554 set_ctrl(n, least); | |
3555 | |
3556 // Collect inner loop bodies | |
605 | 3557 IdealLoopTree *chosen_loop = get_loop(least); |
3558 if( !chosen_loop->_child ) // Inner loop? | |
3559 chosen_loop->_body.push(n);// Collect inner loops | |
0 | 3560 } |
3561 | |
4779
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3562 #ifdef ASSERT |
8048
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
3563 void PhaseIdealLoop::dump_bad_graph(const char* msg, Node* n, Node* early, Node* LCA) { |
8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
roland
parents:
6846
diff
changeset
|
3564 tty->print_cr(msg); |
4779
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3565 tty->print("n: "); n->dump(); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3566 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
|
3567 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
|
3568 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
|
3569 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
|
3570 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3571 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
|
3572 Node* in1 = n->in(i); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3573 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
|
3574 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
|
3575 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
|
3576 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
|
3577 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
|
3578 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
|
3579 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
|
3580 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3581 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
|
3582 Node* in2 = in1->in(j); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3583 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
|
3584 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
|
3585 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
|
3586 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
|
3587 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
|
3588 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
|
3589 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
|
3590 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3591 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3592 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3593 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3594 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3595 tty->cr(); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3596 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
|
3597 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
|
3598 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
|
3599 if (u1 == n) |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3600 continue; |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3601 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
|
3602 if (u1->is_CFG()) { |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3603 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
|
3604 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
|
3605 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
|
3606 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
|
3607 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3608 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3609 } else { |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3610 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
|
3611 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
|
3612 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
|
3613 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
|
3614 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
|
3615 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3616 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
|
3617 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
|
3618 if (u2 == n || u2 == u1) |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3619 continue; |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3620 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
|
3621 if (!u2->is_CFG()) { |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3622 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
|
3623 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
|
3624 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
|
3625 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
|
3626 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
|
3627 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3628 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3629 } |
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 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3632 tty->cr(); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3633 int ct = 0; |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3634 Node *dbg_legal = LCA; |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3635 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
|
3636 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
|
3637 ct++; |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3638 dbg_legal = idom(dbg_legal); |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3639 } |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3640 tty->cr(); |
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 #endif |
c8d8e124380c
7064302: JDK7 build 147 crashed after testing my java 6-compiled web app
kvn
parents:
4115
diff
changeset
|
3643 |
0 | 3644 #ifndef PRODUCT |
3645 //------------------------------dump------------------------------------------- | |
3646 void PhaseIdealLoop::dump( ) const { | |
3647 ResourceMark rm; | |
3648 Arena* arena = Thread::current()->resource_area(); | |
3649 Node_Stack stack(arena, C->unique() >> 2); | |
3650 Node_List rpo_list; | |
3651 VectorSet visited(arena); | |
3652 visited.set(C->top()->_idx); | |
3653 rpo( C->root(), stack, visited, rpo_list ); | |
3654 // Dump root loop indexed by last element in PO order | |
3655 dump( _ltree_root, rpo_list.size(), rpo_list ); | |
3656 } | |
3657 | |
3658 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
|
3659 loop->dump_head(); |
0 | 3660 |
3661 // Now scan for CFG nodes in the same loop | |
3662 for( uint j=idx; j > 0; j-- ) { | |
3663 Node *n = rpo_list[j-1]; | |
3664 if( !_nodes[n->_idx] ) // Skip dead nodes | |
3665 continue; | |
3666 if( get_loop(n) != loop ) { // Wrong loop nest | |
3667 if( get_loop(n)->_head == n && // Found nested loop? | |
3668 get_loop(n)->_parent == loop ) | |
3669 dump(get_loop(n),rpo_list.size(),rpo_list); // Print it nested-ly | |
3670 continue; | |
3671 } | |
3672 | |
3673 // Dump controlling node | |
3674 for( uint x = 0; x < loop->_nest; x++ ) | |
3675 tty->print(" "); | |
3676 tty->print("C"); | |
3677 if( n == C->root() ) { | |
3678 n->dump(); | |
3679 } else { | |
3680 Node* cached_idom = idom_no_update(n); | |
3681 Node *computed_idom = n->in(0); | |
3682 if( n->is_Region() ) { | |
3683 computed_idom = compute_idom(n); | |
3684 // computed_idom() will return n->in(0) when idom(n) is an IfNode (or | |
3685 // any MultiBranch ctrl node), so apply a similar transform to | |
3686 // the cached idom returned from idom_no_update. | |
3687 cached_idom = find_non_split_ctrl(cached_idom); | |
3688 } | |
3689 tty->print(" ID:%d",computed_idom->_idx); | |
3690 n->dump(); | |
3691 if( cached_idom != computed_idom ) { | |
3692 tty->print_cr("*** BROKEN IDOM! Computed as: %d, cached as: %d", | |
3693 computed_idom->_idx, cached_idom->_idx); | |
3694 } | |
3695 } | |
3696 // Dump nodes it controls | |
3697 for( uint k = 0; k < _nodes.Size(); k++ ) { | |
3698 // (k < C->unique() && get_ctrl(find(k)) == n) | |
3699 if (k < C->unique() && _nodes[k] == (Node*)((intptr_t)n + 1)) { | |
3700 Node *m = C->root()->find(k); | |
3701 if( m && m->outcnt() > 0 ) { | |
3702 if (!(has_ctrl(m) && get_ctrl_no_update(m) == n)) { | |
3703 tty->print_cr("*** BROKEN CTRL ACCESSOR! _nodes[k] is %p, ctrl is %p", | |
3704 _nodes[k], has_ctrl(m) ? get_ctrl_no_update(m) : NULL); | |
3705 } | |
3706 for( uint j = 0; j < loop->_nest; j++ ) | |
3707 tty->print(" "); | |
3708 tty->print(" "); | |
3709 m->dump(); | |
3710 } | |
3711 } | |
3712 } | |
3713 } | |
3714 } | |
3715 | |
3716 // Collect a R-P-O for the whole CFG. | |
3717 // Result list is in post-order (scan backwards for RPO) | |
3718 void PhaseIdealLoop::rpo( Node *start, Node_Stack &stk, VectorSet &visited, Node_List &rpo_list ) const { | |
3719 stk.push(start, 0); | |
3720 visited.set(start->_idx); | |
3721 | |
3722 while (stk.is_nonempty()) { | |
3723 Node* m = stk.node(); | |
3724 uint idx = stk.index(); | |
3725 if (idx < m->outcnt()) { | |
3726 stk.set_index(idx + 1); | |
3727 Node* n = m->raw_out(idx); | |
3728 if (n->is_CFG() && !visited.test_set(n->_idx)) { | |
3729 stk.push(n, 0); | |
3730 } | |
3731 } else { | |
3732 rpo_list.push(m); | |
3733 stk.pop(); | |
3734 } | |
3735 } | |
3736 } | |
3737 #endif | |
3738 | |
3739 | |
3740 //============================================================================= | |
3741 //------------------------------LoopTreeIterator----------------------------------- | |
3742 | |
3743 // Advance to next loop tree using a preorder, left-to-right traversal. | |
3744 void LoopTreeIterator::next() { | |
3745 assert(!done(), "must not be done."); | |
3746 if (_curnt->_child != NULL) { | |
3747 _curnt = _curnt->_child; | |
3748 } else if (_curnt->_next != NULL) { | |
3749 _curnt = _curnt->_next; | |
3750 } else { | |
3751 while (_curnt != _root && _curnt->_next == NULL) { | |
3752 _curnt = _curnt->_parent; | |
3753 } | |
3754 if (_curnt == _root) { | |
3755 _curnt = NULL; | |
3756 assert(done(), "must be done."); | |
3757 } else { | |
3758 assert(_curnt->_next != NULL, "must be more to do"); | |
3759 _curnt = _curnt->_next; | |
3760 } | |
3761 } | |
3762 } |