Mercurial > hg > truffle
annotate src/share/vm/opto/loopnode.cpp @ 7666:31540ca73e81
Remove ControlFlowException in SimpleLanguage.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 01 Feb 2013 19:53:52 +0100 |
parents | 377508648226 |
children | 8b3da8d14c93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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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 { | |
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59 if (is_inner_loop()) st->print( "inner " ); |
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60 if (is_partial_peel_loop()) st->print( "partial_peel " ); |
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61 if (partial_peel_has_failed()) st->print( "partial_peel_failed " ); |
0 | 62 } |
63 #endif | |
64 | |
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65 //------------------------------is_valid_counted_loop------------------------- |
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66 bool LoopNode::is_valid_counted_loop() const { |
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67 if (is_CountedLoop()) { |
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68 CountedLoopNode* l = as_CountedLoop(); |
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69 CountedLoopEndNode* le = l->loopexit(); |
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70 if (le != NULL && |
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71 le->proj_out(1 /* true */) == l->in(LoopNode::LoopBackControl)) { |
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72 Node* phi = l->phi(); |
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73 Node* exit = le->proj_out(0 /* false */); |
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74 if (exit != NULL && exit->Opcode() == Op_IfFalse && |
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75 phi != NULL && phi->is_Phi() && |
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76 phi->in(LoopNode::LoopBackControl) == l->incr() && |
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77 le->loopnode() == l && le->stride_is_con()) { |
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78 return true; |
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79 } |
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80 } |
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81 } |
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82 return false; |
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83 } |
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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; | |
91 if( n->in(0) ) { | |
92 early = n->in(0); | |
93 if( !early->is_CFG() ) // Might be a non-CFG multi-def | |
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, "" ); | |
102 for( ; i < n->req(); i++ ) { | |
103 Node *cin = get_ctrl(n->in(i)); | |
104 assert( cin, "" ); | |
105 // Keep deepest dominator depth | |
106 uint c_d = dom_depth(cin); | |
107 if( c_d > e_d ) { // Deeper guy? | |
108 early = cin; // Keep deepest found so far | |
109 e_d = c_d; | |
110 } else if( c_d == e_d && // Same depth? | |
111 early != cin ) { // If not equal, must use slower algorithm | |
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; | |
116 while( 1 ) { | |
117 n1 = idom(n1); // Walk up until break cycle | |
118 n2 = idom(n2); | |
119 if( n1 == cin || // Walked early up to cin | |
120 dom_depth(n2) < c_d ) | |
121 break; // early is deeper; keep him | |
122 if( n2 == early || // Walked cin up to early | |
123 dom_depth(n1) < c_d ) { | |
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 | |
135 return early; | |
136 } | |
137 | |
138 //------------------------------set_early_ctrl--------------------------------- | |
139 // Set earliest legal control | |
140 void PhaseIdealLoop::set_early_ctrl( Node *n ) { | |
141 Node *early = get_early_ctrl(n); | |
142 | |
143 // Record earliest legal location | |
144 set_ctrl(n, early); | |
145 } | |
146 | |
147 //------------------------------set_subtree_ctrl------------------------------- | |
148 // set missing _ctrl entries on new nodes | |
149 void PhaseIdealLoop::set_subtree_ctrl( Node *n ) { | |
150 // Already set? Get out. | |
151 if( _nodes[n->_idx] ) return; | |
152 // Recursively set _nodes array to indicate where the Node goes | |
153 uint i; | |
154 for( i = 0; i < n->req(); ++i ) { | |
155 Node *m = n->in(i); | |
156 if( m && m != C->root() ) | |
157 set_subtree_ctrl( m ); | |
158 } | |
159 | |
160 // Fixup self | |
161 set_early_ctrl( n ); | |
162 } | |
163 | |
164 //------------------------------is_counted_loop-------------------------------- | |
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165 bool PhaseIdealLoop::is_counted_loop( Node *x, IdealLoopTree *loop ) { |
0 | 166 PhaseGVN *gvn = &_igvn; |
167 | |
168 // Counted loop head must be a good RegionNode with only 3 not NULL | |
169 // control input edges: Self, Entry, LoopBack. | |
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170 if (x->in(LoopNode::Self) == NULL || x->req() != 3) |
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171 return false; |
0 | 172 |
173 Node *init_control = x->in(LoopNode::EntryControl); | |
174 Node *back_control = x->in(LoopNode::LoopBackControl); | |
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175 if (init_control == NULL || back_control == NULL) // Partially dead |
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176 return false; |
0 | 177 // Must also check for TOP when looking for a dead loop |
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178 if (init_control->is_top() || back_control->is_top()) |
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179 return false; |
0 | 180 |
181 // Allow funny placement of Safepoint | |
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182 if (back_control->Opcode() == Op_SafePoint) |
0 | 183 back_control = back_control->in(TypeFunc::Control); |
184 | |
185 // Controlling test for loop | |
186 Node *iftrue = back_control; | |
187 uint iftrue_op = iftrue->Opcode(); | |
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188 if (iftrue_op != Op_IfTrue && |
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189 iftrue_op != Op_IfFalse) |
0 | 190 // I have a weird back-control. Probably the loop-exit test is in |
191 // the middle of the loop and I am looking at some trailing control-flow | |
192 // merge point. To fix this I would have to partially peel the loop. | |
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193 return false; // Obscure back-control |
0 | 194 |
195 // Get boolean guarding loop-back test | |
196 Node *iff = iftrue->in(0); | |
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197 if (get_loop(iff) != loop || !iff->in(1)->is_Bool()) |
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198 return false; |
0 | 199 BoolNode *test = iff->in(1)->as_Bool(); |
200 BoolTest::mask bt = test->_test._test; | |
201 float cl_prob = iff->as_If()->_prob; | |
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202 if (iftrue_op == Op_IfFalse) { |
0 | 203 bt = BoolTest(bt).negate(); |
204 cl_prob = 1.0 - cl_prob; | |
205 } | |
206 // Get backedge compare | |
207 Node *cmp = test->in(1); | |
208 int cmp_op = cmp->Opcode(); | |
3345 | 209 if (cmp_op != Op_CmpI) |
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210 return false; // Avoid pointer & float compares |
0 | 211 |
212 // Find the trip-counter increment & limit. Limit must be loop invariant. | |
213 Node *incr = cmp->in(1); | |
214 Node *limit = cmp->in(2); | |
215 | |
216 // --------- | |
217 // need 'loop()' test to tell if limit is loop invariant | |
218 // --------- | |
219 | |
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220 if (!is_member(loop, get_ctrl(incr))) { // Swapped trip counter and limit? |
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221 Node *tmp = incr; // Then reverse order into the CmpI |
0 | 222 incr = limit; |
223 limit = tmp; | |
224 bt = BoolTest(bt).commute(); // And commute the exit test | |
225 } | |
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226 if (is_member(loop, get_ctrl(limit))) // Limit must be loop-invariant |
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227 return false; |
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228 if (!is_member(loop, get_ctrl(incr))) // Trip counter must be loop-variant |
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229 return false; |
0 | 230 |
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231 Node* phi_incr = NULL; |
0 | 232 // Trip-counter increment must be commutative & associative. |
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233 if (incr->is_Phi()) { |
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234 if (incr->as_Phi()->region() != x || incr->req() != 3) |
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235 return false; // Not simple trip counter expression |
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236 phi_incr = incr; |
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237 incr = phi_incr->in(LoopNode::LoopBackControl); // Assume incr is on backedge of Phi |
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238 if (!is_member(loop, get_ctrl(incr))) // Trip counter must be loop-variant |
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239 return false; |
0 | 240 } |
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241 |
0 | 242 Node* trunc1 = NULL; |
243 Node* trunc2 = NULL; | |
244 const TypeInt* iv_trunc_t = NULL; | |
245 if (!(incr = CountedLoopNode::match_incr_with_optional_truncation(incr, &trunc1, &trunc2, &iv_trunc_t))) { | |
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246 return false; // Funny increment opcode |
0 | 247 } |
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248 assert(incr->Opcode() == Op_AddI, "wrong increment code"); |
0 | 249 |
250 // Get merge point | |
251 Node *xphi = incr->in(1); | |
252 Node *stride = incr->in(2); | |
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253 if (!stride->is_Con()) { // Oops, swap these |
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254 if (!xphi->is_Con()) // Is the other guy a constant? |
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255 return false; // Nope, unknown stride, bail out |
0 | 256 Node *tmp = xphi; // 'incr' is commutative, so ok to swap |
257 xphi = stride; | |
258 stride = tmp; | |
259 } | |
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260 // Stride must be constant |
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261 int stride_con = stride->get_int(); |
3345 | 262 if (stride_con == 0) |
263 return false; // missed some peephole opt | |
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264 |
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265 if (!xphi->is_Phi()) |
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266 return false; // Too much math on the trip counter |
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267 if (phi_incr != NULL && phi_incr != xphi) |
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268 return false; |
0 | 269 PhiNode *phi = xphi->as_Phi(); |
270 | |
271 // Phi must be of loop header; backedge must wrap to increment | |
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272 if (phi->region() != x) |
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273 return false; |
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274 if (trunc1 == NULL && phi->in(LoopNode::LoopBackControl) != incr || |
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275 trunc1 != NULL && phi->in(LoopNode::LoopBackControl) != trunc1) { |
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276 return false; |
0 | 277 } |
278 Node *init_trip = phi->in(LoopNode::EntryControl); | |
279 | |
280 // If iv trunc type is smaller than int, check for possible wrap. | |
281 if (!TypeInt::INT->higher_equal(iv_trunc_t)) { | |
282 assert(trunc1 != NULL, "must have found some truncation"); | |
283 | |
284 // Get a better type for the phi (filtered thru if's) | |
285 const TypeInt* phi_ft = filtered_type(phi); | |
286 | |
287 // Can iv take on a value that will wrap? | |
288 // | |
289 // Ensure iv's limit is not within "stride" of the wrap value. | |
290 // | |
291 // Example for "short" type | |
292 // Truncation ensures value is in the range -32768..32767 (iv_trunc_t) | |
293 // If the stride is +10, then the last value of the induction | |
294 // variable before the increment (phi_ft->_hi) must be | |
295 // <= 32767 - 10 and (phi_ft->_lo) must be >= -32768 to | |
296 // ensure no truncation occurs after the increment. | |
297 | |
298 if (stride_con > 0) { | |
299 if (iv_trunc_t->_hi - phi_ft->_hi < stride_con || | |
300 iv_trunc_t->_lo > phi_ft->_lo) { | |
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301 return false; // truncation may occur |
0 | 302 } |
303 } else if (stride_con < 0) { | |
304 if (iv_trunc_t->_lo - phi_ft->_lo > stride_con || | |
305 iv_trunc_t->_hi < phi_ft->_hi) { | |
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306 return false; // truncation may occur |
0 | 307 } |
308 } | |
309 // No possibility of wrap so truncation can be discarded | |
310 // Promote iv type to Int | |
311 } else { | |
312 assert(trunc1 == NULL && trunc2 == NULL, "no truncation for int"); | |
313 } | |
314 | |
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315 // If the condition is inverted and we will be rolling |
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316 // through MININT to MAXINT, then bail out. |
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317 if (bt == BoolTest::eq || // Bail out, but this loop trips at most twice! |
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318 // Odd stride |
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319 bt == BoolTest::ne && stride_con != 1 && stride_con != -1 || |
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320 // Count down loop rolls through MAXINT |
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321 (bt == BoolTest::le || bt == BoolTest::lt) && stride_con < 0 || |
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322 // Count up loop rolls through MININT |
3345 | 323 (bt == BoolTest::ge || bt == BoolTest::gt) && stride_con > 0) { |
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324 return false; // Bail out |
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325 } |
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326 |
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327 const TypeInt* init_t = gvn->type(init_trip)->is_int(); |
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328 const TypeInt* limit_t = gvn->type(limit)->is_int(); |
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329 |
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330 if (stride_con > 0) { |
6846 | 331 jlong init_p = (jlong)init_t->_lo + stride_con; |
332 if (init_p > (jlong)max_jint || init_p > (jlong)limit_t->_hi) | |
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333 return false; // cyclic loop or this loop trips only once |
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334 } else { |
6846 | 335 jlong init_p = (jlong)init_t->_hi + stride_con; |
336 if (init_p < (jlong)min_jint || init_p < (jlong)limit_t->_lo) | |
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337 return false; // cyclic loop or this loop trips only once |
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338 } |
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339 |
0 | 340 // ================================================= |
341 // ---- SUCCESS! Found A Trip-Counted Loop! ----- | |
342 // | |
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343 assert(x->Opcode() == Op_Loop, "regular loops only"); |
0 | 344 C->print_method("Before CountedLoop", 3); |
3345 | 345 |
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346 Node *hook = new (C) Node(6); |
3345 | 347 |
348 if (LoopLimitCheck) { | |
349 | |
350 // =================================================== | |
351 // Generate loop limit check to avoid integer overflow | |
352 // in cases like next (cyclic loops): | |
353 // | |
354 // for (i=0; i <= max_jint; i++) {} | |
355 // for (i=0; i < max_jint; i+=2) {} | |
356 // | |
357 // | |
358 // Limit check predicate depends on the loop test: | |
359 // | |
360 // for(;i != limit; i++) --> limit <= (max_jint) | |
361 // for(;i < limit; i+=stride) --> limit <= (max_jint - stride + 1) | |
362 // for(;i <= limit; i+=stride) --> limit <= (max_jint - stride ) | |
363 // | |
364 | |
365 // Check if limit is excluded to do more precise int overflow check. | |
366 bool incl_limit = (bt == BoolTest::le || bt == BoolTest::ge); | |
367 int stride_m = stride_con - (incl_limit ? 0 : (stride_con > 0 ? 1 : -1)); | |
368 | |
369 // If compare points directly to the phi we need to adjust | |
370 // the compare so that it points to the incr. Limit have | |
371 // to be adjusted to keep trip count the same and the | |
372 // adjusted limit should be checked for int overflow. | |
373 if (phi_incr != NULL) { | |
374 stride_m += stride_con; | |
375 } | |
376 | |
377 if (limit->is_Con()) { | |
378 int limit_con = limit->get_int(); | |
379 if ((stride_con > 0 && limit_con > (max_jint - stride_m)) || | |
380 (stride_con < 0 && limit_con < (min_jint - stride_m))) { | |
381 // Bailout: it could be integer overflow. | |
382 return false; | |
383 } | |
384 } else if ((stride_con > 0 && limit_t->_hi <= (max_jint - stride_m)) || | |
385 (stride_con < 0 && limit_t->_lo >= (min_jint - stride_m))) { | |
386 // Limit's type may satisfy the condition, for example, | |
387 // when it is an array length. | |
388 } else { | |
389 // Generate loop's limit check. | |
390 // Loop limit check predicate should be near the loop. | |
391 ProjNode *limit_check_proj = find_predicate_insertion_point(init_control, Deoptimization::Reason_loop_limit_check); | |
392 if (!limit_check_proj) { | |
393 // The limit check predicate is not generated if this method trapped here before. | |
394 #ifdef ASSERT | |
395 if (TraceLoopLimitCheck) { | |
396 tty->print("missing loop limit check:"); | |
397 loop->dump_head(); | |
398 x->dump(1); | |
399 } | |
400 #endif | |
401 return false; | |
402 } | |
403 | |
404 IfNode* check_iff = limit_check_proj->in(0)->as_If(); | |
405 Node* cmp_limit; | |
406 Node* bol; | |
407 | |
408 if (stride_con > 0) { | |
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409 cmp_limit = new (C) CmpINode(limit, _igvn.intcon(max_jint - stride_m)); |
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410 bol = new (C) BoolNode(cmp_limit, BoolTest::le); |
3345 | 411 } else { |
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412 cmp_limit = new (C) CmpINode(limit, _igvn.intcon(min_jint - stride_m)); |
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413 bol = new (C) BoolNode(cmp_limit, BoolTest::ge); |
3345 | 414 } |
415 cmp_limit = _igvn.register_new_node_with_optimizer(cmp_limit); | |
416 bol = _igvn.register_new_node_with_optimizer(bol); | |
417 set_subtree_ctrl(bol); | |
418 | |
419 // Replace condition in original predicate but preserve Opaque node | |
420 // so that previous predicates could be found. | |
421 assert(check_iff->in(1)->Opcode() == Op_Conv2B && | |
422 check_iff->in(1)->in(1)->Opcode() == Op_Opaque1, ""); | |
423 Node* opq = check_iff->in(1)->in(1); | |
424 _igvn.hash_delete(opq); | |
425 opq->set_req(1, bol); | |
426 // Update ctrl. | |
427 set_ctrl(opq, check_iff->in(0)); | |
428 set_ctrl(check_iff->in(1), check_iff->in(0)); | |
429 | |
2445 | 430 #ifndef PRODUCT |
3345 | 431 // report that the loop predication has been actually performed |
432 // for this loop | |
433 if (TraceLoopLimitCheck) { | |
434 tty->print_cr("Counted Loop Limit Check generated:"); | |
435 debug_only( bol->dump(2); ) | |
436 } | |
437 #endif | |
438 } | |
439 | |
440 if (phi_incr != NULL) { | |
441 // If compare points directly to the phi we need to adjust | |
442 // the compare so that it points to the incr. Limit have | |
443 // to be adjusted to keep trip count the same and we | |
444 // should avoid int overflow. | |
445 // | |
446 // i = init; do {} while(i++ < limit); | |
447 // is converted to | |
448 // i = init; do {} while(++i < limit+1); | |
449 // | |
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450 limit = gvn->transform(new (C) AddINode(limit, stride)); |
2445 | 451 } |
3345 | 452 |
453 // Now we need to canonicalize loop condition. | |
454 if (bt == BoolTest::ne) { | |
455 assert(stride_con == 1 || stride_con == -1, "simple increment only"); | |
3782 | 456 // 'ne' can be replaced with 'lt' only when init < limit. |
457 if (stride_con > 0 && init_t->_hi < limit_t->_lo) | |
458 bt = BoolTest::lt; | |
459 // 'ne' can be replaced with 'gt' only when init > limit. | |
460 if (stride_con < 0 && init_t->_lo > limit_t->_hi) | |
461 bt = BoolTest::gt; | |
3345 | 462 } |
463 | |
464 if (incl_limit) { | |
465 // The limit check guaranties that 'limit <= (max_jint - stride)' so | |
466 // we can convert 'i <= limit' to 'i < limit+1' since stride != 0. | |
467 // | |
468 Node* one = (stride_con > 0) ? gvn->intcon( 1) : gvn->intcon(-1); | |
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469 limit = gvn->transform(new (C) AddINode(limit, one)); |
3345 | 470 if (bt == BoolTest::le) |
471 bt = BoolTest::lt; | |
472 else if (bt == BoolTest::ge) | |
473 bt = BoolTest::gt; | |
474 else | |
475 ShouldNotReachHere(); | |
476 } | |
477 set_subtree_ctrl( limit ); | |
478 | |
479 } else { // LoopLimitCheck | |
480 | |
0 | 481 // If compare points to incr, we are ok. Otherwise the compare |
482 // can directly point to the phi; in this case adjust the compare so that | |
605 | 483 // it points to the incr by adjusting the limit. |
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484 if (cmp->in(1) == phi || cmp->in(2) == phi) |
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485 limit = gvn->transform(new (C) AddINode(limit,stride)); |
0 | 486 |
487 // trip-count for +-tive stride should be: (limit - init_trip + stride - 1)/stride. | |
488 // Final value for iterator should be: trip_count * stride + init_trip. | |
489 Node *one_p = gvn->intcon( 1); | |
490 Node *one_m = gvn->intcon(-1); | |
491 | |
492 Node *trip_count = NULL; | |
493 switch( bt ) { | |
494 case BoolTest::eq: | |
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495 ShouldNotReachHere(); |
0 | 496 case BoolTest::ne: // Ahh, the case we desire |
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497 if (stride_con == 1) |
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498 trip_count = gvn->transform(new (C) SubINode(limit,init_trip)); |
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499 else if (stride_con == -1) |
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500 trip_count = gvn->transform(new (C) SubINode(init_trip,limit)); |
0 | 501 else |
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502 ShouldNotReachHere(); |
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503 set_subtree_ctrl(trip_count); |
0 | 504 //_loop.map(trip_count->_idx,loop(limit)); |
505 break; | |
506 case BoolTest::le: // Maybe convert to '<' case | |
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507 limit = gvn->transform(new (C) AddINode(limit,one_p)); |
0 | 508 set_subtree_ctrl( limit ); |
509 hook->init_req(4, limit); | |
510 | |
511 bt = BoolTest::lt; | |
512 // Make the new limit be in the same loop nest as the old limit | |
513 //_loop.map(limit->_idx,limit_loop); | |
514 // Fall into next case | |
515 case BoolTest::lt: { // Maybe convert to '!=' case | |
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516 if (stride_con < 0) // Count down loop rolls through MAXINT |
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517 ShouldNotReachHere(); |
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518 Node *range = gvn->transform(new (C) SubINode(limit,init_trip)); |
0 | 519 set_subtree_ctrl( range ); |
520 hook->init_req(0, range); | |
521 | |
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522 Node *bias = gvn->transform(new (C) AddINode(range,stride)); |
0 | 523 set_subtree_ctrl( bias ); |
524 hook->init_req(1, bias); | |
525 | |
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526 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_m)); |
0 | 527 set_subtree_ctrl( bias1 ); |
528 hook->init_req(2, bias1); | |
529 | |
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530 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride)); |
0 | 531 set_subtree_ctrl( trip_count ); |
532 hook->init_req(3, trip_count); | |
533 break; | |
534 } | |
535 | |
536 case BoolTest::ge: // Maybe convert to '>' case | |
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537 limit = gvn->transform(new (C) AddINode(limit,one_m)); |
0 | 538 set_subtree_ctrl( limit ); |
539 hook->init_req(4 ,limit); | |
540 | |
541 bt = BoolTest::gt; | |
542 // Make the new limit be in the same loop nest as the old limit | |
543 //_loop.map(limit->_idx,limit_loop); | |
544 // Fall into next case | |
545 case BoolTest::gt: { // Maybe convert to '!=' case | |
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546 if (stride_con > 0) // count up loop rolls through MININT |
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547 ShouldNotReachHere(); |
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548 Node *range = gvn->transform(new (C) SubINode(limit,init_trip)); |
0 | 549 set_subtree_ctrl( range ); |
550 hook->init_req(0, range); | |
551 | |
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552 Node *bias = gvn->transform(new (C) AddINode(range,stride)); |
0 | 553 set_subtree_ctrl( bias ); |
554 hook->init_req(1, bias); | |
555 | |
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556 Node *bias1 = gvn->transform(new (C) AddINode(bias,one_p)); |
0 | 557 set_subtree_ctrl( bias1 ); |
558 hook->init_req(2, bias1); | |
559 | |
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560 trip_count = gvn->transform(new (C) DivINode(0,bias1,stride)); |
0 | 561 set_subtree_ctrl( trip_count ); |
562 hook->init_req(3, trip_count); | |
563 break; | |
564 } | |
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565 } // switch( bt ) |
0 | 566 |
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567 Node *span = gvn->transform(new (C) MulINode(trip_count,stride)); |
0 | 568 set_subtree_ctrl( span ); |
569 hook->init_req(5, span); | |
570 | |
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571 limit = gvn->transform(new (C) AddINode(span,init_trip)); |
0 | 572 set_subtree_ctrl( limit ); |
573 | |
3345 | 574 } // LoopLimitCheck |
575 | |
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576 // Check for SafePoint on backedge and remove |
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577 Node *sfpt = x->in(LoopNode::LoopBackControl); |
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578 if (sfpt->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt)) { |
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579 lazy_replace( sfpt, iftrue ); |
6636 | 580 if (loop->_safepts != NULL) { |
581 loop->_safepts->yank(sfpt); | |
582 } | |
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583 loop->_tail = iftrue; |
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584 } |
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585 |
0 | 586 // Build a canonical trip test. |
587 // Clone code, as old values may be in use. | |
588 incr = incr->clone(); | |
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589 incr->set_req(1,phi); |
0 | 590 incr->set_req(2,stride); |
591 incr = _igvn.register_new_node_with_optimizer(incr); | |
592 set_early_ctrl( incr ); | |
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593 _igvn.hash_delete(phi); |
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594 phi->set_req_X( LoopNode::LoopBackControl, incr, &_igvn ); |
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595 |
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596 // If phi type is more restrictive than Int, raise to |
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597 // Int to prevent (almost) infinite recursion in igvn |
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598 // which can only handle integer types for constants or minint..maxint. |
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599 if (!TypeInt::INT->higher_equal(phi->bottom_type())) { |
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600 Node* nphi = PhiNode::make(phi->in(0), phi->in(LoopNode::EntryControl), TypeInt::INT); |
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601 nphi->set_req(LoopNode::LoopBackControl, phi->in(LoopNode::LoopBackControl)); |
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602 nphi = _igvn.register_new_node_with_optimizer(nphi); |
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603 set_ctrl(nphi, get_ctrl(phi)); |
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604 _igvn.replace_node(phi, nphi); |
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605 phi = nphi->as_Phi(); |
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606 } |
0 | 607 cmp = cmp->clone(); |
608 cmp->set_req(1,incr); | |
609 cmp->set_req(2,limit); | |
610 cmp = _igvn.register_new_node_with_optimizer(cmp); | |
611 set_ctrl(cmp, iff->in(0)); | |
612 | |
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613 test = test->clone()->as_Bool(); |
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614 (*(BoolTest*)&test->_test)._test = bt; |
0 | 615 test->set_req(1,cmp); |
616 _igvn.register_new_node_with_optimizer(test); | |
617 set_ctrl(test, iff->in(0)); | |
618 | |
619 // Replace the old IfNode with a new LoopEndNode | |
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620 Node *lex = _igvn.register_new_node_with_optimizer(new (C) CountedLoopEndNode( iff->in(0), test, cl_prob, iff->as_If()->_fcnt )); |
0 | 621 IfNode *le = lex->as_If(); |
622 uint dd = dom_depth(iff); | |
623 set_idom(le, le->in(0), dd); // Update dominance for loop exit | |
624 set_loop(le, loop); | |
625 | |
626 // Get the loop-exit control | |
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627 Node *iffalse = iff->as_If()->proj_out(!(iftrue_op == Op_IfTrue)); |
0 | 628 |
629 // Need to swap loop-exit and loop-back control? | |
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630 if (iftrue_op == Op_IfFalse) { |
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631 Node *ift2=_igvn.register_new_node_with_optimizer(new (C) IfTrueNode (le)); |
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632 Node *iff2=_igvn.register_new_node_with_optimizer(new (C) IfFalseNode(le)); |
0 | 633 |
634 loop->_tail = back_control = ift2; | |
635 set_loop(ift2, loop); | |
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636 set_loop(iff2, get_loop(iffalse)); |
0 | 637 |
638 // Lazy update of 'get_ctrl' mechanism. | |
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639 lazy_replace_proj( iffalse, iff2 ); |
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640 lazy_replace_proj( iftrue, ift2 ); |
0 | 641 |
642 // Swap names | |
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643 iffalse = iff2; |
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644 iftrue = ift2; |
0 | 645 } else { |
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646 _igvn.hash_delete(iffalse); |
0 | 647 _igvn.hash_delete(iftrue); |
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648 iffalse->set_req_X( 0, le, &_igvn ); |
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649 iftrue ->set_req_X( 0, le, &_igvn ); |
0 | 650 } |
651 | |
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652 set_idom(iftrue, le, dd+1); |
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653 set_idom(iffalse, le, dd+1); |
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654 assert(iff->outcnt() == 0, "should be dead now"); |
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655 lazy_replace( iff, le ); // fix 'get_ctrl' |
0 | 656 |
657 // Now setup a new CountedLoopNode to replace the existing LoopNode | |
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658 CountedLoopNode *l = new (C) CountedLoopNode(init_control, back_control); |
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659 l->set_unswitch_count(x->as_Loop()->unswitch_count()); // Preserve |
0 | 660 // The following assert is approximately true, and defines the intention |
661 // of can_be_counted_loop. It fails, however, because phase->type | |
662 // is not yet initialized for this loop and its parts. | |
663 //assert(l->can_be_counted_loop(this), "sanity"); | |
664 _igvn.register_new_node_with_optimizer(l); | |
665 set_loop(l, loop); | |
666 loop->_head = l; | |
667 // Fix all data nodes placed at the old loop head. | |
668 // Uses the lazy-update mechanism of 'get_ctrl'. | |
669 lazy_replace( x, l ); | |
670 set_idom(l, init_control, dom_depth(x)); | |
671 | |
605 | 672 // Check for immediately preceding SafePoint and remove |
0 | 673 Node *sfpt2 = le->in(0); |
6636 | 674 if (sfpt2->Opcode() == Op_SafePoint && is_deleteable_safept(sfpt2)) { |
0 | 675 lazy_replace( sfpt2, sfpt2->in(TypeFunc::Control)); |
6636 | 676 if (loop->_safepts != NULL) { |
677 loop->_safepts->yank(sfpt2); | |
678 } | |
679 } | |
0 | 680 |
681 // Free up intermediate goo | |
682 _igvn.remove_dead_node(hook); | |
683 | |
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684 #ifdef ASSERT |
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685 assert(l->is_valid_counted_loop(), "counted loop shape is messed up"); |
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686 assert(l == loop->_head && l->phi() == phi && l->loopexit() == lex, "" ); |
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687 #endif |
3345 | 688 #ifndef PRODUCT |
689 if (TraceLoopOpts) { | |
690 tty->print("Counted "); | |
691 loop->dump_head(); | |
692 } | |
693 #endif | |
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694 |
0 | 695 C->print_method("After CountedLoop", 3); |
696 | |
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697 return true; |
0 | 698 } |
699 | |
3345 | 700 //----------------------exact_limit------------------------------------------- |
701 Node* PhaseIdealLoop::exact_limit( IdealLoopTree *loop ) { | |
702 assert(loop->_head->is_CountedLoop(), ""); | |
703 CountedLoopNode *cl = loop->_head->as_CountedLoop(); | |
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704 assert(cl->is_valid_counted_loop(), ""); |
3345 | 705 |
706 if (!LoopLimitCheck || ABS(cl->stride_con()) == 1 || | |
707 cl->limit()->Opcode() == Op_LoopLimit) { | |
708 // Old code has exact limit (it could be incorrect in case of int overflow). | |
709 // Loop limit is exact with stride == 1. And loop may already have exact limit. | |
710 return cl->limit(); | |
711 } | |
712 Node *limit = NULL; | |
713 #ifdef ASSERT | |
714 BoolTest::mask bt = cl->loopexit()->test_trip(); | |
715 assert(bt == BoolTest::lt || bt == BoolTest::gt, "canonical test is expected"); | |
716 #endif | |
717 if (cl->has_exact_trip_count()) { | |
718 // Simple case: loop has constant boundaries. | |
6846 | 719 // Use jlongs to avoid integer overflow. |
3345 | 720 int stride_con = cl->stride_con(); |
6846 | 721 jlong init_con = cl->init_trip()->get_int(); |
722 jlong limit_con = cl->limit()->get_int(); | |
3345 | 723 julong trip_cnt = cl->trip_count(); |
6846 | 724 jlong final_con = init_con + trip_cnt*stride_con; |
3345 | 725 int final_int = (int)final_con; |
726 // The final value should be in integer range since the loop | |
727 // is counted and the limit was checked for overflow. | |
6846 | 728 assert(final_con == (jlong)final_int, "final value should be integer"); |
3345 | 729 limit = _igvn.intcon(final_int); |
730 } else { | |
731 // Create new LoopLimit node to get exact limit (final iv value). | |
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732 limit = new (C) LoopLimitNode(C, cl->init_trip(), cl->limit(), cl->stride()); |
3345 | 733 register_new_node(limit, cl->in(LoopNode::EntryControl)); |
734 } | |
735 assert(limit != NULL, "sanity"); | |
736 return limit; | |
737 } | |
0 | 738 |
739 //------------------------------Ideal------------------------------------------ | |
740 // Return a node which is more "ideal" than the current node. | |
741 // Attempt to convert into a counted-loop. | |
742 Node *LoopNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
743 if (!can_be_counted_loop(phase)) { | |
744 phase->C->set_major_progress(); | |
745 } | |
746 return RegionNode::Ideal(phase, can_reshape); | |
747 } | |
748 | |
749 | |
750 //============================================================================= | |
751 //------------------------------Ideal------------------------------------------ | |
752 // Return a node which is more "ideal" than the current node. | |
753 // Attempt to convert into a counted-loop. | |
754 Node *CountedLoopNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
755 return RegionNode::Ideal(phase, can_reshape); | |
756 } | |
757 | |
758 //------------------------------dump_spec-------------------------------------- | |
759 // Dump special per-node info | |
760 #ifndef PRODUCT | |
761 void CountedLoopNode::dump_spec(outputStream *st) const { | |
762 LoopNode::dump_spec(st); | |
3345 | 763 if (stride_is_con()) { |
0 | 764 st->print("stride: %d ",stride_con()); |
765 } | |
3345 | 766 if (is_pre_loop ()) st->print("pre of N%d" , _main_idx); |
767 if (is_main_loop()) st->print("main of N%d", _idx); | |
768 if (is_post_loop()) st->print("post of N%d", _main_idx); | |
0 | 769 } |
770 #endif | |
771 | |
772 //============================================================================= | |
773 int CountedLoopEndNode::stride_con() const { | |
774 return stride()->bottom_type()->is_int()->get_con(); | |
775 } | |
776 | |
3345 | 777 //============================================================================= |
778 //------------------------------Value----------------------------------------- | |
779 const Type *LoopLimitNode::Value( PhaseTransform *phase ) const { | |
780 const Type* init_t = phase->type(in(Init)); | |
781 const Type* limit_t = phase->type(in(Limit)); | |
782 const Type* stride_t = phase->type(in(Stride)); | |
783 // Either input is TOP ==> the result is TOP | |
784 if (init_t == Type::TOP) return Type::TOP; | |
785 if (limit_t == Type::TOP) return Type::TOP; | |
786 if (stride_t == Type::TOP) return Type::TOP; | |
787 | |
788 int stride_con = stride_t->is_int()->get_con(); | |
789 if (stride_con == 1) | |
790 return NULL; // Identity | |
791 | |
792 if (init_t->is_int()->is_con() && limit_t->is_int()->is_con()) { | |
6846 | 793 // Use jlongs to avoid integer overflow. |
794 jlong init_con = init_t->is_int()->get_con(); | |
795 jlong limit_con = limit_t->is_int()->get_con(); | |
3345 | 796 int stride_m = stride_con - (stride_con > 0 ? 1 : -1); |
6846 | 797 jlong trip_count = (limit_con - init_con + stride_m)/stride_con; |
798 jlong final_con = init_con + stride_con*trip_count; | |
3345 | 799 int final_int = (int)final_con; |
800 // The final value should be in integer range since the loop | |
801 // is counted and the limit was checked for overflow. | |
6846 | 802 assert(final_con == (jlong)final_int, "final value should be integer"); |
3345 | 803 return TypeInt::make(final_int); |
804 } | |
805 | |
806 return bottom_type(); // TypeInt::INT | |
807 } | |
808 | |
809 //------------------------------Ideal------------------------------------------ | |
810 // Return a node which is more "ideal" than the current node. | |
811 Node *LoopLimitNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
812 if (phase->type(in(Init)) == Type::TOP || | |
813 phase->type(in(Limit)) == Type::TOP || | |
814 phase->type(in(Stride)) == Type::TOP) | |
815 return NULL; // Dead | |
816 | |
817 int stride_con = phase->type(in(Stride))->is_int()->get_con(); | |
818 if (stride_con == 1) | |
819 return NULL; // Identity | |
820 | |
821 if (in(Init)->is_Con() && in(Limit)->is_Con()) | |
822 return NULL; // Value | |
823 | |
824 // Delay following optimizations until all loop optimizations | |
825 // done to keep Ideal graph simple. | |
826 if (!can_reshape || phase->C->major_progress()) | |
827 return NULL; | |
828 | |
829 const TypeInt* init_t = phase->type(in(Init) )->is_int(); | |
830 const TypeInt* limit_t = phase->type(in(Limit))->is_int(); | |
831 int stride_p; | |
6846 | 832 jlong lim, ini; |
3345 | 833 julong max; |
834 if (stride_con > 0) { | |
835 stride_p = stride_con; | |
836 lim = limit_t->_hi; | |
837 ini = init_t->_lo; | |
838 max = (julong)max_jint; | |
839 } else { | |
840 stride_p = -stride_con; | |
841 lim = init_t->_hi; | |
842 ini = limit_t->_lo; | |
843 max = (julong)min_jint; | |
844 } | |
845 julong range = lim - ini + stride_p; | |
846 if (range <= max) { | |
847 // Convert to integer expression if it is not overflow. | |
848 Node* stride_m = phase->intcon(stride_con - (stride_con > 0 ? 1 : -1)); | |
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849 Node *range = phase->transform(new (phase->C) SubINode(in(Limit), in(Init))); |
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850 Node *bias = phase->transform(new (phase->C) AddINode(range, stride_m)); |
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851 Node *trip = phase->transform(new (phase->C) DivINode(0, bias, in(Stride))); |
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852 Node *span = phase->transform(new (phase->C) MulINode(trip, in(Stride))); |
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853 return new (phase->C) AddINode(span, in(Init)); // exact limit |
3345 | 854 } |
855 | |
856 if (is_power_of_2(stride_p) || // divisor is 2^n | |
857 !Matcher::has_match_rule(Op_LoopLimit)) { // or no specialized Mach node? | |
858 // Convert to long expression to avoid integer overflow | |
859 // and let igvn optimizer convert this division. | |
860 // | |
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861 Node* init = phase->transform( new (phase->C) ConvI2LNode(in(Init))); |
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862 Node* limit = phase->transform( new (phase->C) ConvI2LNode(in(Limit))); |
3345 | 863 Node* stride = phase->longcon(stride_con); |
864 Node* stride_m = phase->longcon(stride_con - (stride_con > 0 ? 1 : -1)); | |
865 | |
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866 Node *range = phase->transform(new (phase->C) SubLNode(limit, init)); |
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867 Node *bias = phase->transform(new (phase->C) AddLNode(range, stride_m)); |
3345 | 868 Node *span; |
869 if (stride_con > 0 && is_power_of_2(stride_p)) { | |
870 // bias >= 0 if stride >0, so if stride is 2^n we can use &(-stride) | |
871 // and avoid generating rounding for division. Zero trip guard should | |
872 // guarantee that init < limit but sometimes the guard is missing and | |
873 // we can get situation when init > limit. Note, for the empty loop | |
874 // optimization zero trip guard is generated explicitly which leaves | |
875 // only RCE predicate where exact limit is used and the predicate | |
876 // will simply fail forcing recompilation. | |
877 Node* neg_stride = phase->longcon(-stride_con); | |
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878 span = phase->transform(new (phase->C) AndLNode(bias, neg_stride)); |
3345 | 879 } else { |
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880 Node *trip = phase->transform(new (phase->C) DivLNode(0, bias, stride)); |
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881 span = phase->transform(new (phase->C) MulLNode(trip, stride)); |
3345 | 882 } |
883 // Convert back to int | |
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884 Node *span_int = phase->transform(new (phase->C) ConvL2INode(span)); |
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885 return new (phase->C) AddINode(span_int, in(Init)); // exact limit |
3345 | 886 } |
887 | |
888 return NULL; // No progress | |
889 } | |
890 | |
891 //------------------------------Identity--------------------------------------- | |
892 // If stride == 1 return limit node. | |
893 Node *LoopLimitNode::Identity( PhaseTransform *phase ) { | |
894 int stride_con = phase->type(in(Stride))->is_int()->get_con(); | |
895 if (stride_con == 1 || stride_con == -1) | |
896 return in(Limit); | |
897 return this; | |
898 } | |
899 | |
900 //============================================================================= | |
0 | 901 //----------------------match_incr_with_optional_truncation-------------------- |
902 // Match increment with optional truncation: | |
903 // CHAR: (i+1)&0x7fff, BYTE: ((i+1)<<8)>>8, or SHORT: ((i+1)<<16)>>16 | |
904 // Return NULL for failure. Success returns the increment node. | |
905 Node* CountedLoopNode::match_incr_with_optional_truncation( | |
906 Node* expr, Node** trunc1, Node** trunc2, const TypeInt** trunc_type) { | |
907 // Quick cutouts: | |
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908 if (expr == NULL || expr->req() != 3) return NULL; |
0 | 909 |
910 Node *t1 = NULL; | |
911 Node *t2 = NULL; | |
912 const TypeInt* trunc_t = TypeInt::INT; | |
913 Node* n1 = expr; | |
914 int n1op = n1->Opcode(); | |
915 | |
916 // Try to strip (n1 & M) or (n1 << N >> N) from n1. | |
917 if (n1op == Op_AndI && | |
918 n1->in(2)->is_Con() && | |
919 n1->in(2)->bottom_type()->is_int()->get_con() == 0x7fff) { | |
920 // %%% This check should match any mask of 2**K-1. | |
921 t1 = n1; | |
922 n1 = t1->in(1); | |
923 n1op = n1->Opcode(); | |
924 trunc_t = TypeInt::CHAR; | |
925 } else if (n1op == Op_RShiftI && | |
926 n1->in(1) != NULL && | |
927 n1->in(1)->Opcode() == Op_LShiftI && | |
928 n1->in(2) == n1->in(1)->in(2) && | |
929 n1->in(2)->is_Con()) { | |
930 jint shift = n1->in(2)->bottom_type()->is_int()->get_con(); | |
931 // %%% This check should match any shift in [1..31]. | |
932 if (shift == 16 || shift == 8) { | |
933 t1 = n1; | |
934 t2 = t1->in(1); | |
935 n1 = t2->in(1); | |
936 n1op = n1->Opcode(); | |
937 if (shift == 16) { | |
938 trunc_t = TypeInt::SHORT; | |
939 } else if (shift == 8) { | |
940 trunc_t = TypeInt::BYTE; | |
941 } | |
942 } | |
943 } | |
944 | |
945 // If (maybe after stripping) it is an AddI, we won: | |
946 if (n1op == Op_AddI) { | |
947 *trunc1 = t1; | |
948 *trunc2 = t2; | |
949 *trunc_type = trunc_t; | |
950 return n1; | |
951 } | |
952 | |
953 // failed | |
954 return NULL; | |
955 } | |
956 | |
957 | |
958 //------------------------------filtered_type-------------------------------- | |
959 // Return a type based on condition control flow | |
960 // A successful return will be a type that is restricted due | |
961 // to a series of dominating if-tests, such as: | |
962 // if (i < 10) { | |
963 // if (i > 0) { | |
964 // here: "i" type is [1..10) | |
965 // } | |
966 // } | |
967 // or a control flow merge | |
968 // if (i < 10) { | |
969 // do { | |
970 // phi( , ) -- at top of loop type is [min_int..10) | |
971 // i = ? | |
972 // } while ( i < 10) | |
973 // | |
974 const TypeInt* PhaseIdealLoop::filtered_type( Node *n, Node* n_ctrl) { | |
975 assert(n && n->bottom_type()->is_int(), "must be int"); | |
976 const TypeInt* filtered_t = NULL; | |
977 if (!n->is_Phi()) { | |
978 assert(n_ctrl != NULL || n_ctrl == C->top(), "valid control"); | |
979 filtered_t = filtered_type_from_dominators(n, n_ctrl); | |
980 | |
981 } else { | |
982 Node* phi = n->as_Phi(); | |
983 Node* region = phi->in(0); | |
984 assert(n_ctrl == NULL || n_ctrl == region, "ctrl parameter must be region"); | |
985 if (region && region != C->top()) { | |
986 for (uint i = 1; i < phi->req(); i++) { | |
987 Node* val = phi->in(i); | |
988 Node* use_c = region->in(i); | |
989 const TypeInt* val_t = filtered_type_from_dominators(val, use_c); | |
990 if (val_t != NULL) { | |
991 if (filtered_t == NULL) { | |
992 filtered_t = val_t; | |
993 } else { | |
994 filtered_t = filtered_t->meet(val_t)->is_int(); | |
995 } | |
996 } | |
997 } | |
998 } | |
999 } | |
1000 const TypeInt* n_t = _igvn.type(n)->is_int(); | |
1001 if (filtered_t != NULL) { | |
1002 n_t = n_t->join(filtered_t)->is_int(); | |
1003 } | |
1004 return n_t; | |
1005 } | |
1006 | |
1007 | |
1008 //------------------------------filtered_type_from_dominators-------------------------------- | |
1009 // Return a possibly more restrictive type for val based on condition control flow of dominators | |
1010 const TypeInt* PhaseIdealLoop::filtered_type_from_dominators( Node* val, Node *use_ctrl) { | |
1011 if (val->is_Con()) { | |
1012 return val->bottom_type()->is_int(); | |
1013 } | |
1014 uint if_limit = 10; // Max number of dominating if's visited | |
1015 const TypeInt* rtn_t = NULL; | |
1016 | |
1017 if (use_ctrl && use_ctrl != C->top()) { | |
1018 Node* val_ctrl = get_ctrl(val); | |
1019 uint val_dom_depth = dom_depth(val_ctrl); | |
1020 Node* pred = use_ctrl; | |
1021 uint if_cnt = 0; | |
1022 while (if_cnt < if_limit) { | |
1023 if ((pred->Opcode() == Op_IfTrue || pred->Opcode() == Op_IfFalse)) { | |
1024 if_cnt++; | |
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1025 const TypeInt* if_t = IfNode::filtered_int_type(&_igvn, val, pred); |
0 | 1026 if (if_t != NULL) { |
1027 if (rtn_t == NULL) { | |
1028 rtn_t = if_t; | |
1029 } else { | |
1030 rtn_t = rtn_t->join(if_t)->is_int(); | |
1031 } | |
1032 } | |
1033 } | |
1034 pred = idom(pred); | |
1035 if (pred == NULL || pred == C->top()) { | |
1036 break; | |
1037 } | |
1038 // Stop if going beyond definition block of val | |
1039 if (dom_depth(pred) < val_dom_depth) { | |
1040 break; | |
1041 } | |
1042 } | |
1043 } | |
1044 return rtn_t; | |
1045 } | |
1046 | |
1047 | |
1048 //------------------------------dump_spec-------------------------------------- | |
1049 // Dump special per-node info | |
1050 #ifndef PRODUCT | |
1051 void CountedLoopEndNode::dump_spec(outputStream *st) const { | |
1052 if( in(TestValue)->is_Bool() ) { | |
1053 BoolTest bt( test_trip()); // Added this for g++. | |
1054 | |
1055 st->print("["); | |
1056 bt.dump_on(st); | |
1057 st->print("]"); | |
1058 } | |
1059 st->print(" "); | |
1060 IfNode::dump_spec(st); | |
1061 } | |
1062 #endif | |
1063 | |
1064 //============================================================================= | |
1065 //------------------------------is_member-------------------------------------- | |
1066 // Is 'l' a member of 'this'? | |
1067 int IdealLoopTree::is_member( const IdealLoopTree *l ) const { | |
1068 while( l->_nest > _nest ) l = l->_parent; | |
1069 return l == this; | |
1070 } | |
1071 | |
1072 //------------------------------set_nest--------------------------------------- | |
1073 // Set loop tree nesting depth. Accumulate _has_call bits. | |
1074 int IdealLoopTree::set_nest( uint depth ) { | |
1075 _nest = depth; | |
1076 int bits = _has_call; | |
1077 if( _child ) bits |= _child->set_nest(depth+1); | |
1078 if( bits ) _has_call = 1; | |
1079 if( _next ) bits |= _next ->set_nest(depth ); | |
1080 return bits; | |
1081 } | |
1082 | |
1083 //------------------------------split_fall_in---------------------------------- | |
1084 // Split out multiple fall-in edges from the loop header. Move them to a | |
1085 // private RegionNode before the loop. This becomes the loop landing pad. | |
1086 void IdealLoopTree::split_fall_in( PhaseIdealLoop *phase, int fall_in_cnt ) { | |
1087 PhaseIterGVN &igvn = phase->_igvn; | |
1088 uint i; | |
1089 | |
1090 // Make a new RegionNode to be the landing pad. | |
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1091 Node *landing_pad = new (phase->C) RegionNode( fall_in_cnt+1 ); |
0 | 1092 phase->set_loop(landing_pad,_parent); |
1093 // Gather all the fall-in control paths into the landing pad | |
1094 uint icnt = fall_in_cnt; | |
1095 uint oreq = _head->req(); | |
1096 for( i = oreq-1; i>0; i-- ) | |
1097 if( !phase->is_member( this, _head->in(i) ) ) | |
1098 landing_pad->set_req(icnt--,_head->in(i)); | |
1099 | |
1100 // Peel off PhiNode edges as well | |
1101 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1102 Node *oj = _head->fast_out(j); | |
1103 if( oj->is_Phi() ) { | |
1104 PhiNode* old_phi = oj->as_Phi(); | |
1105 assert( old_phi->region() == _head, "" ); | |
1106 igvn.hash_delete(old_phi); // Yank from hash before hacking edges | |
1107 Node *p = PhiNode::make_blank(landing_pad, old_phi); | |
1108 uint icnt = fall_in_cnt; | |
1109 for( i = oreq-1; i>0; i-- ) { | |
1110 if( !phase->is_member( this, _head->in(i) ) ) { | |
1111 p->init_req(icnt--, old_phi->in(i)); | |
1112 // Go ahead and clean out old edges from old phi | |
1113 old_phi->del_req(i); | |
1114 } | |
1115 } | |
1116 // Search for CSE's here, because ZKM.jar does a lot of | |
1117 // loop hackery and we need to be a little incremental | |
1118 // with the CSE to avoid O(N^2) node blow-up. | |
1119 Node *p2 = igvn.hash_find_insert(p); // Look for a CSE | |
1120 if( p2 ) { // Found CSE | |
1121 p->destruct(); // Recover useless new node | |
1122 p = p2; // Use old node | |
1123 } else { | |
1124 igvn.register_new_node_with_optimizer(p, old_phi); | |
1125 } | |
1126 // Make old Phi refer to new Phi. | |
1127 old_phi->add_req(p); | |
1128 // Check for the special case of making the old phi useless and | |
1129 // disappear it. In JavaGrande I have a case where this useless | |
1130 // Phi is the loop limit and prevents recognizing a CountedLoop | |
1131 // which in turn prevents removing an empty loop. | |
1132 Node *id_old_phi = old_phi->Identity( &igvn ); | |
1133 if( id_old_phi != old_phi ) { // Found a simple identity? | |
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1134 // Note that I cannot call 'replace_node' here, because |
0 | 1135 // that will yank the edge from old_phi to the Region and |
1136 // I'm mid-iteration over the Region's uses. | |
1137 for (DUIterator_Last imin, i = old_phi->last_outs(imin); i >= imin; ) { | |
1138 Node* use = old_phi->last_out(i); | |
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1139 igvn.rehash_node_delayed(use); |
0 | 1140 uint uses_found = 0; |
1141 for (uint j = 0; j < use->len(); j++) { | |
1142 if (use->in(j) == old_phi) { | |
1143 if (j < use->req()) use->set_req (j, id_old_phi); | |
1144 else use->set_prec(j, id_old_phi); | |
1145 uses_found++; | |
1146 } | |
1147 } | |
1148 i -= uses_found; // we deleted 1 or more copies of this edge | |
1149 } | |
1150 } | |
1151 igvn._worklist.push(old_phi); | |
1152 } | |
1153 } | |
1154 // Finally clean out the fall-in edges from the RegionNode | |
1155 for( i = oreq-1; i>0; i-- ) { | |
1156 if( !phase->is_member( this, _head->in(i) ) ) { | |
1157 _head->del_req(i); | |
1158 } | |
1159 } | |
1160 // Transform landing pad | |
1161 igvn.register_new_node_with_optimizer(landing_pad, _head); | |
1162 // Insert landing pad into the header | |
1163 _head->add_req(landing_pad); | |
1164 } | |
1165 | |
1166 //------------------------------split_outer_loop------------------------------- | |
1167 // Split out the outermost loop from this shared header. | |
1168 void IdealLoopTree::split_outer_loop( PhaseIdealLoop *phase ) { | |
1169 PhaseIterGVN &igvn = phase->_igvn; | |
1170 | |
1171 // Find index of outermost loop; it should also be my tail. | |
1172 uint outer_idx = 1; | |
1173 while( _head->in(outer_idx) != _tail ) outer_idx++; | |
1174 | |
1175 // Make a LoopNode for the outermost loop. | |
1176 Node *ctl = _head->in(LoopNode::EntryControl); | |
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1177 Node *outer = new (phase->C) LoopNode( ctl, _head->in(outer_idx) ); |
0 | 1178 outer = igvn.register_new_node_with_optimizer(outer, _head); |
1179 phase->set_created_loop_node(); | |
2445 | 1180 |
0 | 1181 // Outermost loop falls into '_head' loop |
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1182 _head->set_req(LoopNode::EntryControl, outer); |
0 | 1183 _head->del_req(outer_idx); |
1184 // Split all the Phis up between '_head' loop and 'outer' loop. | |
1185 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1186 Node *out = _head->fast_out(j); | |
1187 if( out->is_Phi() ) { | |
1188 PhiNode *old_phi = out->as_Phi(); | |
1189 assert( old_phi->region() == _head, "" ); | |
1190 Node *phi = PhiNode::make_blank(outer, old_phi); | |
1191 phi->init_req(LoopNode::EntryControl, old_phi->in(LoopNode::EntryControl)); | |
1192 phi->init_req(LoopNode::LoopBackControl, old_phi->in(outer_idx)); | |
1193 phi = igvn.register_new_node_with_optimizer(phi, old_phi); | |
1194 // Make old Phi point to new Phi on the fall-in path | |
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1195 igvn.replace_input_of(old_phi, LoopNode::EntryControl, phi); |
0 | 1196 old_phi->del_req(outer_idx); |
1197 } | |
1198 } | |
1199 | |
1200 // Use the new loop head instead of the old shared one | |
1201 _head = outer; | |
1202 phase->set_loop(_head, this); | |
1203 } | |
1204 | |
1205 //------------------------------fix_parent------------------------------------- | |
1206 static void fix_parent( IdealLoopTree *loop, IdealLoopTree *parent ) { | |
1207 loop->_parent = parent; | |
1208 if( loop->_child ) fix_parent( loop->_child, loop ); | |
1209 if( loop->_next ) fix_parent( loop->_next , parent ); | |
1210 } | |
1211 | |
1212 //------------------------------estimate_path_freq----------------------------- | |
1213 static float estimate_path_freq( Node *n ) { | |
1214 // Try to extract some path frequency info | |
1215 IfNode *iff; | |
1216 for( int i = 0; i < 50; i++ ) { // Skip through a bunch of uncommon tests | |
1217 uint nop = n->Opcode(); | |
1218 if( nop == Op_SafePoint ) { // Skip any safepoint | |
1219 n = n->in(0); | |
1220 continue; | |
1221 } | |
1222 if( nop == Op_CatchProj ) { // Get count from a prior call | |
1223 // Assume call does not always throw exceptions: means the call-site | |
1224 // count is also the frequency of the fall-through path. | |
1225 assert( n->is_CatchProj(), "" ); | |
1226 if( ((CatchProjNode*)n)->_con != CatchProjNode::fall_through_index ) | |
1227 return 0.0f; // Assume call exception path is rare | |
1228 Node *call = n->in(0)->in(0)->in(0); | |
1229 assert( call->is_Call(), "expect a call here" ); | |
1230 const JVMState *jvms = ((CallNode*)call)->jvms(); | |
1231 ciMethodData* methodData = jvms->method()->method_data(); | |
1232 if (!methodData->is_mature()) return 0.0f; // No call-site data | |
1233 ciProfileData* data = methodData->bci_to_data(jvms->bci()); | |
1234 if ((data == NULL) || !data->is_CounterData()) { | |
1235 // no call profile available, try call's control input | |
1236 n = n->in(0); | |
1237 continue; | |
1238 } | |
1239 return data->as_CounterData()->count()/FreqCountInvocations; | |
1240 } | |
1241 // See if there's a gating IF test | |
1242 Node *n_c = n->in(0); | |
1243 if( !n_c->is_If() ) break; // No estimate available | |
1244 iff = n_c->as_If(); | |
1245 if( iff->_fcnt != COUNT_UNKNOWN ) // Have a valid count? | |
1246 // Compute how much count comes on this path | |
1247 return ((nop == Op_IfTrue) ? iff->_prob : 1.0f - iff->_prob) * iff->_fcnt; | |
1248 // Have no count info. Skip dull uncommon-trap like branches. | |
1249 if( (nop == Op_IfTrue && iff->_prob < PROB_LIKELY_MAG(5)) || | |
1250 (nop == Op_IfFalse && iff->_prob > PROB_UNLIKELY_MAG(5)) ) | |
1251 break; | |
1252 // Skip through never-taken branch; look for a real loop exit. | |
1253 n = iff->in(0); | |
1254 } | |
1255 return 0.0f; // No estimate available | |
1256 } | |
1257 | |
1258 //------------------------------merge_many_backedges--------------------------- | |
1259 // Merge all the backedges from the shared header into a private Region. | |
1260 // Feed that region as the one backedge to this loop. | |
1261 void IdealLoopTree::merge_many_backedges( PhaseIdealLoop *phase ) { | |
1262 uint i; | |
1263 | |
1264 // Scan for the top 2 hottest backedges | |
1265 float hotcnt = 0.0f; | |
1266 float warmcnt = 0.0f; | |
1267 uint hot_idx = 0; | |
1268 // Loop starts at 2 because slot 1 is the fall-in path | |
1269 for( i = 2; i < _head->req(); i++ ) { | |
1270 float cnt = estimate_path_freq(_head->in(i)); | |
1271 if( cnt > hotcnt ) { // Grab hottest path | |
1272 warmcnt = hotcnt; | |
1273 hotcnt = cnt; | |
1274 hot_idx = i; | |
1275 } else if( cnt > warmcnt ) { // And 2nd hottest path | |
1276 warmcnt = cnt; | |
1277 } | |
1278 } | |
1279 | |
1280 // See if the hottest backedge is worthy of being an inner loop | |
1281 // by being much hotter than the next hottest backedge. | |
1282 if( hotcnt <= 0.0001 || | |
1283 hotcnt < 2.0*warmcnt ) hot_idx = 0;// No hot backedge | |
1284 | |
1285 // Peel out the backedges into a private merge point; peel | |
1286 // them all except optionally hot_idx. | |
1287 PhaseIterGVN &igvn = phase->_igvn; | |
1288 | |
1289 Node *hot_tail = NULL; | |
1290 // Make a Region for the merge point | |
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1291 Node *r = new (phase->C) RegionNode(1); |
0 | 1292 for( i = 2; i < _head->req(); i++ ) { |
1293 if( i != hot_idx ) | |
1294 r->add_req( _head->in(i) ); | |
1295 else hot_tail = _head->in(i); | |
1296 } | |
1297 igvn.register_new_node_with_optimizer(r, _head); | |
1298 // Plug region into end of loop _head, followed by hot_tail | |
1299 while( _head->req() > 3 ) _head->del_req( _head->req()-1 ); | |
1300 _head->set_req(2, r); | |
1301 if( hot_idx ) _head->add_req(hot_tail); | |
1302 | |
1303 // Split all the Phis up between '_head' loop and the Region 'r' | |
1304 for (DUIterator_Fast jmax, j = _head->fast_outs(jmax); j < jmax; j++) { | |
1305 Node *out = _head->fast_out(j); | |
1306 if( out->is_Phi() ) { | |
1307 PhiNode* n = out->as_Phi(); | |
1308 igvn.hash_delete(n); // Delete from hash before hacking edges | |
1309 Node *hot_phi = NULL; | |
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1310 Node *phi = new (phase->C) PhiNode(r, n->type(), n->adr_type()); |
0 | 1311 // Check all inputs for the ones to peel out |
1312 uint j = 1; | |
1313 for( uint i = 2; i < n->req(); i++ ) { | |
1314 if( i != hot_idx ) | |
1315 phi->set_req( j++, n->in(i) ); | |
1316 else hot_phi = n->in(i); | |
1317 } | |
1318 // Register the phi but do not transform until whole place transforms | |
1319 igvn.register_new_node_with_optimizer(phi, n); | |
1320 // Add the merge phi to the old Phi | |
1321 while( n->req() > 3 ) n->del_req( n->req()-1 ); | |
1322 n->set_req(2, phi); | |
1323 if( hot_idx ) n->add_req(hot_phi); | |
1324 } | |
1325 } | |
1326 | |
1327 | |
1328 // Insert a new IdealLoopTree inserted below me. Turn it into a clone | |
1329 // of self loop tree. Turn self into a loop headed by _head and with | |
1330 // tail being the new merge point. | |
1331 IdealLoopTree *ilt = new IdealLoopTree( phase, _head, _tail ); | |
1332 phase->set_loop(_tail,ilt); // Adjust tail | |
1333 _tail = r; // Self's tail is new merge point | |
1334 phase->set_loop(r,this); | |
1335 ilt->_child = _child; // New guy has my children | |
1336 _child = ilt; // Self has new guy as only child | |
1337 ilt->_parent = this; // new guy has self for parent | |
1338 ilt->_nest = _nest; // Same nesting depth (for now) | |
1339 | |
1340 // Starting with 'ilt', look for child loop trees using the same shared | |
1341 // header. Flatten these out; they will no longer be loops in the end. | |
1342 IdealLoopTree **pilt = &_child; | |
1343 while( ilt ) { | |
1344 if( ilt->_head == _head ) { | |
1345 uint i; | |
1346 for( i = 2; i < _head->req(); i++ ) | |
1347 if( _head->in(i) == ilt->_tail ) | |
1348 break; // Still a loop | |
1349 if( i == _head->req() ) { // No longer a loop | |
1350 // Flatten ilt. Hang ilt's "_next" list from the end of | |
1351 // ilt's '_child' list. Move the ilt's _child up to replace ilt. | |
1352 IdealLoopTree **cp = &ilt->_child; | |
1353 while( *cp ) cp = &(*cp)->_next; // Find end of child list | |
1354 *cp = ilt->_next; // Hang next list at end of child list | |
1355 *pilt = ilt->_child; // Move child up to replace ilt | |
1356 ilt->_head = NULL; // Flag as a loop UNIONED into parent | |
1357 ilt = ilt->_child; // Repeat using new ilt | |
1358 continue; // do not advance over ilt->_child | |
1359 } | |
1360 assert( ilt->_tail == hot_tail, "expected to only find the hot inner loop here" ); | |
1361 phase->set_loop(_head,ilt); | |
1362 } | |
1363 pilt = &ilt->_child; // Advance to next | |
1364 ilt = *pilt; | |
1365 } | |
1366 | |
1367 if( _child ) fix_parent( _child, this ); | |
1368 } | |
1369 | |
1370 //------------------------------beautify_loops--------------------------------- | |
1371 // Split shared headers and insert loop landing pads. | |
1372 // Insert a LoopNode to replace the RegionNode. | |
1373 // Return TRUE if loop tree is structurally changed. | |
1374 bool IdealLoopTree::beautify_loops( PhaseIdealLoop *phase ) { | |
1375 bool result = false; | |
1376 // Cache parts in locals for easy | |
1377 PhaseIterGVN &igvn = phase->_igvn; | |
1378 | |
1379 igvn.hash_delete(_head); // Yank from hash before hacking edges | |
1380 | |
1381 // Check for multiple fall-in paths. Peel off a landing pad if need be. | |
1382 int fall_in_cnt = 0; | |
1383 for( uint i = 1; i < _head->req(); i++ ) | |
1384 if( !phase->is_member( this, _head->in(i) ) ) | |
1385 fall_in_cnt++; | |
1386 assert( fall_in_cnt, "at least 1 fall-in path" ); | |
1387 if( fall_in_cnt > 1 ) // Need a loop landing pad to merge fall-ins | |
1388 split_fall_in( phase, fall_in_cnt ); | |
1389 | |
1390 // Swap inputs to the _head and all Phis to move the fall-in edge to | |
1391 // the left. | |
1392 fall_in_cnt = 1; | |
1393 while( phase->is_member( this, _head->in(fall_in_cnt) ) ) | |
1394 fall_in_cnt++; | |
1395 if( fall_in_cnt > 1 ) { | |
1396 // Since I am just swapping inputs I do not need to update def-use info | |
1397 Node *tmp = _head->in(1); | |
1398 _head->set_req( 1, _head->in(fall_in_cnt) ); | |
1399 _head->set_req( fall_in_cnt, tmp ); | |
1400 // Swap also all Phis | |
1401 for (DUIterator_Fast imax, i = _head->fast_outs(imax); i < imax; i++) { | |
1402 Node* phi = _head->fast_out(i); | |
1403 if( phi->is_Phi() ) { | |
1404 igvn.hash_delete(phi); // Yank from hash before hacking edges | |
1405 tmp = phi->in(1); | |
1406 phi->set_req( 1, phi->in(fall_in_cnt) ); | |
1407 phi->set_req( fall_in_cnt, tmp ); | |
1408 } | |
1409 } | |
1410 } | |
1411 assert( !phase->is_member( this, _head->in(1) ), "left edge is fall-in" ); | |
1412 assert( phase->is_member( this, _head->in(2) ), "right edge is loop" ); | |
1413 | |
1414 // If I am a shared header (multiple backedges), peel off the many | |
1415 // backedges into a private merge point and use the merge point as | |
1416 // the one true backedge. | |
1417 if( _head->req() > 3 ) { | |
2445 | 1418 // Merge the many backedges into a single backedge but leave |
1419 // the hottest backedge as separate edge for the following peel. | |
0 | 1420 merge_many_backedges( phase ); |
1421 result = true; | |
1422 } | |
1423 | |
2445 | 1424 // If I have one hot backedge, peel off myself loop. |
0 | 1425 // I better be the outermost loop. |
1426 if( _head->req() > 3 ) { | |
1427 split_outer_loop( phase ); | |
1428 result = true; | |
1429 | |
1430 } else if( !_head->is_Loop() && !_irreducible ) { | |
1431 // Make a new LoopNode to replace the old loop head | |
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1432 Node *l = new (phase->C) LoopNode( _head->in(1), _head->in(2) ); |
0 | 1433 l = igvn.register_new_node_with_optimizer(l, _head); |
1434 phase->set_created_loop_node(); | |
1435 // Go ahead and replace _head | |
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1436 phase->_igvn.replace_node( _head, l ); |
0 | 1437 _head = l; |
1438 phase->set_loop(_head, this); | |
1439 } | |
1440 | |
1441 // Now recursively beautify nested loops | |
1442 if( _child ) result |= _child->beautify_loops( phase ); | |
1443 if( _next ) result |= _next ->beautify_loops( phase ); | |
1444 return result; | |
1445 } | |
1446 | |
1447 //------------------------------allpaths_check_safepts---------------------------- | |
1448 // Allpaths backwards scan from loop tail, terminating each path at first safepoint | |
1449 // encountered. Helper for check_safepts. | |
1450 void IdealLoopTree::allpaths_check_safepts(VectorSet &visited, Node_List &stack) { | |
1451 assert(stack.size() == 0, "empty stack"); | |
1452 stack.push(_tail); | |
1453 visited.Clear(); | |
1454 visited.set(_tail->_idx); | |
1455 while (stack.size() > 0) { | |
1456 Node* n = stack.pop(); | |
1457 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) { | |
1458 // Terminate this path | |
1459 } else if (n->Opcode() == Op_SafePoint) { | |
1460 if (_phase->get_loop(n) != this) { | |
1461 if (_required_safept == NULL) _required_safept = new Node_List(); | |
1462 _required_safept->push(n); // save the one closest to the tail | |
1463 } | |
1464 // Terminate this path | |
1465 } else { | |
1466 uint start = n->is_Region() ? 1 : 0; | |
1467 uint end = n->is_Region() && !n->is_Loop() ? n->req() : start + 1; | |
1468 for (uint i = start; i < end; i++) { | |
1469 Node* in = n->in(i); | |
1470 assert(in->is_CFG(), "must be"); | |
1471 if (!visited.test_set(in->_idx) && is_member(_phase->get_loop(in))) { | |
1472 stack.push(in); | |
1473 } | |
1474 } | |
1475 } | |
1476 } | |
1477 } | |
1478 | |
1479 //------------------------------check_safepts---------------------------- | |
1480 // Given dominators, try to find loops with calls that must always be | |
1481 // executed (call dominates loop tail). These loops do not need non-call | |
1482 // safepoints (ncsfpt). | |
1483 // | |
1484 // A complication is that a safepoint in a inner loop may be needed | |
1485 // by an outer loop. In the following, the inner loop sees it has a | |
1486 // call (block 3) on every path from the head (block 2) to the | |
1487 // backedge (arc 3->2). So it deletes the ncsfpt (non-call safepoint) | |
1488 // in block 2, _but_ this leaves the outer loop without a safepoint. | |
1489 // | |
1490 // entry 0 | |
1491 // | | |
1492 // v | |
1493 // outer 1,2 +->1 | |
1494 // | | | |
1495 // | v | |
1496 // | 2<---+ ncsfpt in 2 | |
1497 // |_/|\ | | |
1498 // | v | | |
1499 // inner 2,3 / 3 | call in 3 | |
1500 // / | | | |
1501 // v +--+ | |
1502 // exit 4 | |
1503 // | |
1504 // | |
1505 // This method creates a list (_required_safept) of ncsfpt nodes that must | |
1506 // be protected is created for each loop. When a ncsfpt maybe deleted, it | |
1507 // is first looked for in the lists for the outer loops of the current loop. | |
1508 // | |
1509 // The insights into the problem: | |
1510 // A) counted loops are okay | |
1511 // B) innermost loops are okay (only an inner loop can delete | |
1512 // a ncsfpt needed by an outer loop) | |
1513 // C) a loop is immune from an inner loop deleting a safepoint | |
1514 // if the loop has a call on the idom-path | |
1515 // D) a loop is also immune if it has a ncsfpt (non-call safepoint) on the | |
1516 // idom-path that is not in a nested loop | |
1517 // E) otherwise, an ncsfpt on the idom-path that is nested in an inner | |
1518 // loop needs to be prevented from deletion by an inner loop | |
1519 // | |
1520 // There are two analyses: | |
1521 // 1) The first, and cheaper one, scans the loop body from | |
1522 // tail to head following the idom (immediate dominator) | |
1523 // chain, looking for the cases (C,D,E) above. | |
1524 // Since inner loops are scanned before outer loops, there is summary | |
1525 // information about inner loops. Inner loops can be skipped over | |
1526 // when the tail of an inner loop is encountered. | |
1527 // | |
1528 // 2) The second, invoked if the first fails to find a call or ncsfpt on | |
1529 // the idom path (which is rare), scans all predecessor control paths | |
1530 // from the tail to the head, terminating a path when a call or sfpt | |
1531 // is encountered, to find the ncsfpt's that are closest to the tail. | |
1532 // | |
1533 void IdealLoopTree::check_safepts(VectorSet &visited, Node_List &stack) { | |
1534 // Bottom up traversal | |
1535 IdealLoopTree* ch = _child; | |
6636 | 1536 if (_child) _child->check_safepts(visited, stack); |
1537 if (_next) _next ->check_safepts(visited, stack); | |
0 | 1538 |
1539 if (!_head->is_CountedLoop() && !_has_sfpt && _parent != NULL && !_irreducible) { | |
1540 bool has_call = false; // call on dom-path | |
1541 bool has_local_ncsfpt = false; // ncsfpt on dom-path at this loop depth | |
1542 Node* nonlocal_ncsfpt = NULL; // ncsfpt on dom-path at a deeper depth | |
1543 // Scan the dom-path nodes from tail to head | |
1544 for (Node* n = tail(); n != _head; n = _phase->idom(n)) { | |
1545 if (n->is_Call() && n->as_Call()->guaranteed_safepoint()) { | |
1546 has_call = true; | |
1547 _has_sfpt = 1; // Then no need for a safept! | |
1548 break; | |
1549 } else if (n->Opcode() == Op_SafePoint) { | |
1550 if (_phase->get_loop(n) == this) { | |
1551 has_local_ncsfpt = true; | |
1552 break; | |
1553 } | |
1554 if (nonlocal_ncsfpt == NULL) { | |
1555 nonlocal_ncsfpt = n; // save the one closest to the tail | |
1556 } | |
1557 } else { | |
1558 IdealLoopTree* nlpt = _phase->get_loop(n); | |
1559 if (this != nlpt) { | |
1560 // If at an inner loop tail, see if the inner loop has already | |
1561 // recorded seeing a call on the dom-path (and stop.) If not, | |
1562 // jump to the head of the inner loop. | |
1563 assert(is_member(nlpt), "nested loop"); | |
1564 Node* tail = nlpt->_tail; | |
1565 if (tail->in(0)->is_If()) tail = tail->in(0); | |
1566 if (n == tail) { | |
1567 // If inner loop has call on dom-path, so does outer loop | |
1568 if (nlpt->_has_sfpt) { | |
1569 has_call = true; | |
1570 _has_sfpt = 1; | |
1571 break; | |
1572 } | |
1573 // Skip to head of inner loop | |
1574 assert(_phase->is_dominator(_head, nlpt->_head), "inner head dominated by outer head"); | |
1575 n = nlpt->_head; | |
1576 } | |
1577 } | |
1578 } | |
1579 } | |
1580 // Record safept's that this loop needs preserved when an | |
1581 // inner loop attempts to delete it's safepoints. | |
1582 if (_child != NULL && !has_call && !has_local_ncsfpt) { | |
1583 if (nonlocal_ncsfpt != NULL) { | |
1584 if (_required_safept == NULL) _required_safept = new Node_List(); | |
1585 _required_safept->push(nonlocal_ncsfpt); | |
1586 } else { | |
1587 // Failed to find a suitable safept on the dom-path. Now use | |
1588 // an all paths walk from tail to head, looking for safepoints to preserve. | |
1589 allpaths_check_safepts(visited, stack); | |
1590 } | |
1591 } | |
1592 } | |
1593 } | |
1594 | |
1595 //---------------------------is_deleteable_safept---------------------------- | |
1596 // Is safept not required by an outer loop? | |
1597 bool PhaseIdealLoop::is_deleteable_safept(Node* sfpt) { | |
1598 assert(sfpt->Opcode() == Op_SafePoint, ""); | |
1599 IdealLoopTree* lp = get_loop(sfpt)->_parent; | |
1600 while (lp != NULL) { | |
1601 Node_List* sfpts = lp->_required_safept; | |
1602 if (sfpts != NULL) { | |
1603 for (uint i = 0; i < sfpts->size(); i++) { | |
1604 if (sfpt == sfpts->at(i)) | |
1605 return false; | |
1606 } | |
1607 } | |
1608 lp = lp->_parent; | |
1609 } | |
1610 return true; | |
1611 } | |
1612 | |
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1613 //---------------------------replace_parallel_iv------------------------------- |
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1614 // Replace parallel induction variable (parallel to trip counter) |
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1615 void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) { |
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1616 assert(loop->_head->is_CountedLoop(), ""); |
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1617 CountedLoopNode *cl = loop->_head->as_CountedLoop(); |
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1618 if (!cl->is_valid_counted_loop()) |
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1619 return; // skip malformed counted loop |
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1620 Node *incr = cl->incr(); |
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1621 if (incr == NULL) |
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1622 return; // Dead loop? |
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1623 Node *init = cl->init_trip(); |
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1624 Node *phi = cl->phi(); |
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1625 int stride_con = cl->stride_con(); |
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1626 |
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1627 // Visit all children, looking for Phis |
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1628 for (DUIterator i = cl->outs(); cl->has_out(i); i++) { |
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1629 Node *out = cl->out(i); |
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1630 // Look for other phis (secondary IVs). Skip dead ones |
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1631 if (!out->is_Phi() || out == phi || !has_node(out)) |
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1632 continue; |
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1633 PhiNode* phi2 = out->as_Phi(); |
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1634 Node *incr2 = phi2->in( LoopNode::LoopBackControl ); |
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1635 // Look for induction variables of the form: X += constant |
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1636 if (phi2->region() != loop->_head || |
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1637 incr2->req() != 3 || |
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1638 incr2->in(1) != phi2 || |
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1639 incr2 == incr || |
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1640 incr2->Opcode() != Op_AddI || |
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1641 !incr2->in(2)->is_Con()) |
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1642 continue; |
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1643 |
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1644 // Check for parallel induction variable (parallel to trip counter) |
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1645 // via an affine function. In particular, count-down loops with |
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1646 // count-up array indices are common. We only RCE references off |
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1647 // the trip-counter, so we need to convert all these to trip-counter |
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1648 // expressions. |
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1649 Node *init2 = phi2->in( LoopNode::EntryControl ); |
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1650 int stride_con2 = incr2->in(2)->get_int(); |
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1651 |
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1652 // The general case here gets a little tricky. We want to find the |
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1653 // GCD of all possible parallel IV's and make a new IV using this |
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1654 // GCD for the loop. Then all possible IVs are simple multiples of |
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1655 // the GCD. In practice, this will cover very few extra loops. |
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1656 // Instead we require 'stride_con2' to be a multiple of 'stride_con', |
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1657 // where +/-1 is the common case, but other integer multiples are |
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1658 // also easy to handle. |
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1659 int ratio_con = stride_con2/stride_con; |
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1660 |
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1661 if ((ratio_con * stride_con) == stride_con2) { // Check for exact |
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1662 #ifndef PRODUCT |
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1663 if (TraceLoopOpts) { |
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1664 tty->print("Parallel IV: %d ", phi2->_idx); |
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1665 loop->dump_head(); |
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1666 } |
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1667 #endif |
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1668 // Convert to using the trip counter. The parallel induction |
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1669 // variable differs from the trip counter by a loop-invariant |
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1670 // amount, the difference between their respective initial values. |
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1671 // It is scaled by the 'ratio_con'. |
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1672 Node* ratio = _igvn.intcon(ratio_con); |
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1673 set_ctrl(ratio, C->root()); |
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1674 Node* ratio_init = new (C) MulINode(init, ratio); |
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1675 _igvn.register_new_node_with_optimizer(ratio_init, init); |
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1676 set_early_ctrl(ratio_init); |
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1677 Node* diff = new (C) SubINode(init2, ratio_init); |
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1678 _igvn.register_new_node_with_optimizer(diff, init2); |
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1679 set_early_ctrl(diff); |
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1680 Node* ratio_idx = new (C) MulINode(phi, ratio); |
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1681 _igvn.register_new_node_with_optimizer(ratio_idx, phi); |
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1682 set_ctrl(ratio_idx, cl); |
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1683 Node* add = new (C) AddINode(ratio_idx, diff); |
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1684 _igvn.register_new_node_with_optimizer(add); |
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1685 set_ctrl(add, cl); |
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1686 _igvn.replace_node( phi2, add ); |
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1687 // Sometimes an induction variable is unused |
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1688 if (add->outcnt() == 0) { |
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1689 _igvn.remove_dead_node(add); |
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1690 } |
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1691 --i; // deleted this phi; rescan starting with next position |
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1692 continue; |
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1693 } |
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1694 } |
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1695 } |
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1696 |
0 | 1697 //------------------------------counted_loop----------------------------------- |
1698 // Convert to counted loops where possible | |
1699 void IdealLoopTree::counted_loop( PhaseIdealLoop *phase ) { | |
1700 | |
1701 // For grins, set the inner-loop flag here | |
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1702 if (!_child) { |
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1703 if (_head->is_Loop()) _head->as_Loop()->set_inner_loop(); |
0 | 1704 } |
1705 | |
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1706 if (_head->is_CountedLoop() || |
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1707 phase->is_counted_loop(_head, this)) { |
0 | 1708 _has_sfpt = 1; // Indicate we do not need a safepoint here |
1709 | |
6636 | 1710 // Look for safepoints to remove. |
1711 Node_List* sfpts = _safepts; | |
1712 if (sfpts != NULL) { | |
1713 for (uint i = 0; i < sfpts->size(); i++) { | |
1714 Node* n = sfpts->at(i); | |
1715 assert(phase->get_loop(n) == this, ""); | |
1716 if (phase->is_deleteable_safept(n)) { | |
1717 phase->lazy_replace(n, n->in(TypeFunc::Control)); | |
1718 } | |
1719 } | |
1720 } | |
0 | 1721 |
1722 // Look for induction variables | |
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1723 phase->replace_parallel_iv(this); |
0 | 1724 |
1725 } else if (_parent != NULL && !_irreducible) { | |
1726 // Not a counted loop. | |
6636 | 1727 // Look for a safepoint on the idom-path. |
1728 Node* sfpt = tail(); | |
1729 for (; sfpt != _head; sfpt = phase->idom(sfpt)) { | |
1730 if (sfpt->Opcode() == Op_SafePoint && phase->get_loop(sfpt) == this) | |
1731 break; // Found one | |
0 | 1732 } |
6636 | 1733 // Delete other safepoints in this loop. |
1734 Node_List* sfpts = _safepts; | |
1735 if (sfpts != NULL && sfpt != _head && sfpt->Opcode() == Op_SafePoint) { | |
1736 for (uint i = 0; i < sfpts->size(); i++) { | |
1737 Node* n = sfpts->at(i); | |
1738 assert(phase->get_loop(n) == this, ""); | |
1739 if (n != sfpt && phase->is_deleteable_safept(n)) { | |
1740 phase->lazy_replace(n, n->in(TypeFunc::Control)); | |
1741 } | |
1742 } | |
0 | 1743 } |
1744 } | |
1745 | |
1746 // Recursively | |
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1747 if (_child) _child->counted_loop( phase ); |
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1748 if (_next) _next ->counted_loop( phase ); |
0 | 1749 } |
1750 | |
1751 #ifndef PRODUCT | |
1752 //------------------------------dump_head-------------------------------------- | |
1753 // Dump 1 liner for loop header info | |
1754 void IdealLoopTree::dump_head( ) const { | |
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1755 for (uint i=0; i<_nest; i++) |
0 | 1756 tty->print(" "); |
1757 tty->print("Loop: N%d/N%d ",_head->_idx,_tail->_idx); | |
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1758 if (_irreducible) tty->print(" IRREDUCIBLE"); |
3345 | 1759 Node* entry = _head->in(LoopNode::EntryControl); |
1760 if (LoopLimitCheck) { | |
1761 Node* predicate = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
1762 if (predicate != NULL ) { | |
1763 tty->print(" limit_check"); | |
1764 entry = entry->in(0)->in(0); | |
1765 } | |
1766 } | |
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1767 if (UseLoopPredicate) { |
3345 | 1768 entry = PhaseIdealLoop::find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); |
2445 | 1769 if (entry != NULL) { |
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1770 tty->print(" predicated"); |
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1771 } |
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1772 } |
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1773 if (_head->is_CountedLoop()) { |
0 | 1774 CountedLoopNode *cl = _head->as_CountedLoop(); |
1775 tty->print(" counted"); | |
2465 | 1776 |
1777 Node* init_n = cl->init_trip(); | |
1778 if (init_n != NULL && init_n->is_Con()) | |
1779 tty->print(" [%d,", cl->init_trip()->get_int()); | |
1780 else | |
1781 tty->print(" [int,"); | |
1782 Node* limit_n = cl->limit(); | |
1783 if (limit_n != NULL && limit_n->is_Con()) | |
1784 tty->print("%d),", cl->limit()->get_int()); | |
1785 else | |
1786 tty->print("int),"); | |
1787 int stride_con = cl->stride_con(); | |
1788 if (stride_con > 0) tty->print("+"); | |
1789 tty->print("%d", stride_con); | |
1790 | |
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1791 tty->print(" (%d iters) ", (int)cl->profile_trip_cnt()); |
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1792 |
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1793 if (cl->is_pre_loop ()) tty->print(" pre" ); |
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1794 if (cl->is_main_loop()) tty->print(" main"); |
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1795 if (cl->is_post_loop()) tty->print(" post"); |
0 | 1796 } |
1797 tty->cr(); | |
1798 } | |
1799 | |
1800 //------------------------------dump------------------------------------------- | |
1801 // Dump loops by loop tree | |
1802 void IdealLoopTree::dump( ) const { | |
1803 dump_head(); | |
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1804 if (_child) _child->dump(); |
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1805 if (_next) _next ->dump(); |
0 | 1806 } |
1807 | |
1808 #endif | |
1809 | |
367
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1810 static void log_loop_tree(IdealLoopTree* root, IdealLoopTree* loop, CompileLog* log) { |
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1811 if (loop == root) { |
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1812 if (loop->_child != NULL) { |
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1813 log->begin_head("loop_tree"); |
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1814 log->end_head(); |
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1815 if( loop->_child ) log_loop_tree(root, loop->_child, log); |
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1816 log->tail("loop_tree"); |
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1817 assert(loop->_next == NULL, "what?"); |
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1818 } |
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1819 } else { |
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1820 Node* head = loop->_head; |
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1821 log->begin_head("loop"); |
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1822 log->print(" idx='%d' ", head->_idx); |
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1823 if (loop->_irreducible) log->print("irreducible='1' "); |
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1824 if (head->is_Loop()) { |
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1825 if (head->as_Loop()->is_inner_loop()) log->print("inner_loop='1' "); |
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1826 if (head->as_Loop()->is_partial_peel_loop()) log->print("partial_peel_loop='1' "); |
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1827 } |
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1828 if (head->is_CountedLoop()) { |
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1829 CountedLoopNode* cl = head->as_CountedLoop(); |
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1830 if (cl->is_pre_loop()) log->print("pre_loop='%d' ", cl->main_idx()); |
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1831 if (cl->is_main_loop()) log->print("main_loop='%d' ", cl->_idx); |
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1832 if (cl->is_post_loop()) log->print("post_loop='%d' ", cl->main_idx()); |
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1833 } |
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1834 log->end_head(); |
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1835 if( loop->_child ) log_loop_tree(root, loop->_child, log); |
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1836 log->tail("loop"); |
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1837 if( loop->_next ) log_loop_tree(root, loop->_next, log); |
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1838 } |
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1839 } |
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1840 |
1172 | 1841 //---------------------collect_potentially_useful_predicates----------------------- |
1842 // Helper function to collect potentially useful predicates to prevent them from | |
1843 // being eliminated by PhaseIdealLoop::eliminate_useless_predicates | |
1844 void PhaseIdealLoop::collect_potentially_useful_predicates( | |
1845 IdealLoopTree * loop, Unique_Node_List &useful_predicates) { | |
1846 if (loop->_child) { // child | |
1847 collect_potentially_useful_predicates(loop->_child, useful_predicates); | |
1848 } | |
1849 | |
1850 // self (only loops that we can apply loop predication may use their predicates) | |
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1851 if (loop->_head->is_Loop() && |
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1852 !loop->_irreducible && |
1172 | 1853 !loop->tail()->is_top()) { |
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1854 LoopNode* lpn = loop->_head->as_Loop(); |
1172 | 1855 Node* entry = lpn->in(LoopNode::EntryControl); |
3345 | 1856 Node* predicate_proj = find_predicate(entry); // loop_limit_check first |
1172 | 1857 if (predicate_proj != NULL ) { // right pattern that can be used by loop predication |
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1858 assert(entry->in(0)->in(1)->in(1)->Opcode() == Op_Opaque1, "must be"); |
1172 | 1859 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one |
3345 | 1860 entry = entry->in(0)->in(0); |
1861 } | |
1862 predicate_proj = find_predicate(entry); // Predicate | |
1863 if (predicate_proj != NULL ) { | |
1864 useful_predicates.push(entry->in(0)->in(1)->in(1)); // good one | |
1172 | 1865 } |
1866 } | |
1867 | |
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1868 if (loop->_next) { // sibling |
1172 | 1869 collect_potentially_useful_predicates(loop->_next, useful_predicates); |
1870 } | |
1871 } | |
1872 | |
1873 //------------------------eliminate_useless_predicates----------------------------- | |
1874 // Eliminate all inserted predicates if they could not be used by loop predication. | |
3345 | 1875 // Note: it will also eliminates loop limits check predicate since it also uses |
1876 // Opaque1 node (see Parse::add_predicate()). | |
1172 | 1877 void PhaseIdealLoop::eliminate_useless_predicates() { |
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1878 if (C->predicate_count() == 0) |
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1879 return; // no predicate left |
1172 | 1880 |
1881 Unique_Node_List useful_predicates; // to store useful predicates | |
1882 if (C->has_loops()) { | |
1883 collect_potentially_useful_predicates(_ltree_root->_child, useful_predicates); | |
1884 } | |
1885 | |
1886 for (int i = C->predicate_count(); i > 0; i--) { | |
1887 Node * n = C->predicate_opaque1_node(i-1); | |
1888 assert(n->Opcode() == Op_Opaque1, "must be"); | |
1889 if (!useful_predicates.member(n)) { // not in the useful list | |
1890 _igvn.replace_node(n, n->in(1)); | |
1891 } | |
1892 } | |
1893 } | |
1894 | |
0 | 1895 //============================================================================= |
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1896 //----------------------------build_and_optimize------------------------------- |
0 | 1897 // Create a PhaseLoop. Build the ideal Loop tree. Map each Ideal Node to |
1898 // its corresponding LoopNode. If 'optimize' is true, do some loop cleanups. | |
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1899 void PhaseIdealLoop::build_and_optimize(bool do_split_ifs, bool skip_loop_opts) { |
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1900 ResourceMark rm; |
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1901 |
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1902 int old_progress = C->major_progress(); |
2403 | 1903 uint orig_worklist_size = _igvn._worklist.size(); |
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1904 |
0 | 1905 // Reset major-progress flag for the driver's heuristics |
1906 C->clear_major_progress(); | |
1907 | |
1908 #ifndef PRODUCT | |
1909 // Capture for later assert | |
1910 uint unique = C->unique(); | |
1911 _loop_invokes++; | |
1912 _loop_work += unique; | |
1913 #endif | |
1914 | |
1915 // True if the method has at least 1 irreducible loop | |
1916 _has_irreducible_loops = false; | |
1917 | |
1918 _created_loop_node = false; | |
1919 | |
1920 Arena *a = Thread::current()->resource_area(); | |
1921 VectorSet visited(a); | |
1922 // Pre-grow the mapping from Nodes to IdealLoopTrees. | |
1923 _nodes.map(C->unique(), NULL); | |
1924 memset(_nodes.adr(), 0, wordSize * C->unique()); | |
1925 | |
1926 // Pre-build the top-level outermost loop tree entry | |
1927 _ltree_root = new IdealLoopTree( this, C->root(), C->root() ); | |
1928 // Do not need a safepoint at the top level | |
1929 _ltree_root->_has_sfpt = 1; | |
1930 | |
2445 | 1931 // Initialize Dominators. |
1932 // Checked in clone_loop_predicate() during beautify_loops(). | |
1933 _idom_size = 0; | |
1934 _idom = NULL; | |
1935 _dom_depth = NULL; | |
1936 _dom_stk = NULL; | |
1937 | |
0 | 1938 // Empty pre-order array |
1939 allocate_preorders(); | |
1940 | |
1941 // Build a loop tree on the fly. Build a mapping from CFG nodes to | |
1942 // IdealLoopTree entries. Data nodes are NOT walked. | |
1943 build_loop_tree(); | |
1944 // Check for bailout, and return | |
1945 if (C->failing()) { | |
1946 return; | |
1947 } | |
1948 | |
1949 // No loops after all | |
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1950 if( !_ltree_root->_child && !_verify_only ) C->set_has_loops(false); |
0 | 1951 |
1952 // There should always be an outer loop containing the Root and Return nodes. | |
1953 // If not, we have a degenerate empty program. Bail out in this case. | |
1954 if (!has_node(C->root())) { | |
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1955 if (!_verify_only) { |
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1956 C->clear_major_progress(); |
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1957 C->record_method_not_compilable("empty program detected during loop optimization"); |
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1958 } |
0 | 1959 return; |
1960 } | |
1961 | |
1962 // Nothing to do, so get out | |
4115 | 1963 if( !C->has_loops() && !skip_loop_opts && !do_split_ifs && !_verify_me && !_verify_only ) { |
0 | 1964 _igvn.optimize(); // Cleanup NeverBranches |
1965 return; | |
1966 } | |
1967 | |
1968 // Set loop nesting depth | |
1969 _ltree_root->set_nest( 0 ); | |
1970 | |
1971 // Split shared headers and insert loop landing pads. | |
1972 // Do not bother doing this on the Root loop of course. | |
921
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1973 if( !_verify_me && !_verify_only && _ltree_root->_child ) { |
2403 | 1974 C->print_method("Before beautify loops", 3); |
0 | 1975 if( _ltree_root->_child->beautify_loops( this ) ) { |
1976 // Re-build loop tree! | |
1977 _ltree_root->_child = NULL; | |
1978 _nodes.clear(); | |
1979 reallocate_preorders(); | |
1980 build_loop_tree(); | |
1981 // Check for bailout, and return | |
1982 if (C->failing()) { | |
1983 return; | |
1984 } | |
1985 // Reset loop nesting depth | |
1986 _ltree_root->set_nest( 0 ); | |
222 | 1987 |
1988 C->print_method("After beautify loops", 3); | |
0 | 1989 } |
1990 } | |
1991 | |
1992 // Build Dominators for elision of NULL checks & loop finding. | |
1993 // Since nodes do not have a slot for immediate dominator, make | |
605 | 1994 // a persistent side array for that info indexed on node->_idx. |
0 | 1995 _idom_size = C->unique(); |
1996 _idom = NEW_RESOURCE_ARRAY( Node*, _idom_size ); | |
1997 _dom_depth = NEW_RESOURCE_ARRAY( uint, _idom_size ); | |
1998 _dom_stk = NULL; // Allocated on demand in recompute_dom_depth | |
1999 memset( _dom_depth, 0, _idom_size * sizeof(uint) ); | |
2000 | |
2001 Dominators(); | |
2002 | |
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2003 if (!_verify_only) { |
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2004 // As a side effect, Dominators removed any unreachable CFG paths |
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2005 // into RegionNodes. It doesn't do this test against Root, so |
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2006 // we do it here. |
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2007 for( uint i = 1; i < C->root()->req(); i++ ) { |
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2008 if( !_nodes[C->root()->in(i)->_idx] ) { // Dead path into Root? |
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2009 _igvn.delete_input_of(C->root(), i); |
921
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2010 i--; // Rerun same iteration on compressed edges |
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2011 } |
0 | 2012 } |
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2013 |
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2014 // Given dominators, try to find inner loops with calls that must |
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2015 // always be executed (call dominates loop tail). These loops do |
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2016 // not need a separate safepoint. |
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2017 Node_List cisstack(a); |
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2018 _ltree_root->check_safepts(visited, cisstack); |
0 | 2019 } |
2020 | |
2021 // Walk the DATA nodes and place into loops. Find earliest control | |
2022 // node. For CFG nodes, the _nodes array starts out and remains | |
2023 // holding the associated IdealLoopTree pointer. For DATA nodes, the | |
2024 // _nodes array holds the earliest legal controlling CFG node. | |
2025 | |
2026 // Allocate stack with enough space to avoid frequent realloc | |
2027 int stack_size = (C->unique() >> 1) + 16; // (unique>>1)+16 from Java2D stats | |
2028 Node_Stack nstack( a, stack_size ); | |
2029 | |
2030 visited.Clear(); | |
2031 Node_List worklist(a); | |
2032 // Don't need C->root() on worklist since | |
2033 // it will be processed among C->top() inputs | |
2034 worklist.push( C->top() ); | |
2035 visited.set( C->top()->_idx ); // Set C->top() as visited now | |
921
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2036 build_loop_early( visited, worklist, nstack ); |
0 | 2037 |
2038 // Given early legal placement, try finding counted loops. This placement | |
2039 // is good enough to discover most loop invariants. | |
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2040 if( !_verify_me && !_verify_only ) |
0 | 2041 _ltree_root->counted_loop( this ); |
2042 | |
2043 // Find latest loop placement. Find ideal loop placement. | |
2044 visited.Clear(); | |
2045 init_dom_lca_tags(); | |
2046 // Need C->root() on worklist when processing outs | |
2047 worklist.push( C->root() ); | |
2048 NOT_PRODUCT( C->verify_graph_edges(); ) | |
2049 worklist.push( C->top() ); | |
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2050 build_loop_late( visited, worklist, nstack ); |
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2051 |
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2052 if (_verify_only) { |
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2053 // restore major progress flag |
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2054 for (int i = 0; i < old_progress; i++) |
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2055 C->set_major_progress(); |
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2056 assert(C->unique() == unique, "verification mode made Nodes? ? ?"); |
2403 | 2057 assert(_igvn._worklist.size() == orig_worklist_size, "shouldn't push anything"); |
921
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2058 return; |
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2059 } |
0 | 2060 |
2445 | 2061 // Some parser-inserted loop predicates could never be used by loop |
2062 // predication or they were moved away from loop during some optimizations. | |
2063 // For example, peeling. Eliminate them before next loop optimizations. | |
3345 | 2064 if (UseLoopPredicate || LoopLimitCheck) { |
1172 | 2065 eliminate_useless_predicates(); |
2066 } | |
2067 | |
0 | 2068 // clear out the dead code |
2069 while(_deadlist.size()) { | |
921
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2070 _igvn.remove_globally_dead_node(_deadlist.pop()); |
0 | 2071 } |
2072 | |
2073 #ifndef PRODUCT | |
2074 C->verify_graph_edges(); | |
2383
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2075 if (_verify_me) { // Nested verify pass? |
0 | 2076 // Check to see if the verify mode is broken |
2077 assert(C->unique() == unique, "non-optimize mode made Nodes? ? ?"); | |
2078 return; | |
2079 } | |
2383
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2080 if(VerifyLoopOptimizations) verify(); |
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2081 if(TraceLoopOpts && C->has_loops()) { |
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2082 _ltree_root->dump(); |
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2083 } |
0 | 2084 #endif |
2085 | |
4064
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2086 if (skip_loop_opts) { |
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2087 // Cleanup any modified bits |
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2088 _igvn.optimize(); |
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2089 |
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2090 if (C->log() != NULL) { |
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2091 log_loop_tree(_ltree_root, _ltree_root, C->log()); |
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2092 } |
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2093 return; |
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2094 } |
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2095 |
0 | 2096 if (ReassociateInvariants) { |
2097 // Reassociate invariants and prep for split_thru_phi | |
2098 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) { | |
2099 IdealLoopTree* lpt = iter.current(); | |
2100 if (!lpt->is_counted() || !lpt->is_inner()) continue; | |
2101 | |
2102 lpt->reassociate_invariants(this); | |
2103 | |
2104 // Because RCE opportunities can be masked by split_thru_phi, | |
2105 // look for RCE candidates and inhibit split_thru_phi | |
2106 // on just their loop-phi's for this pass of loop opts | |
1172 | 2107 if (SplitIfBlocks && do_split_ifs) { |
0 | 2108 if (lpt->policy_range_check(this)) { |
39
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2109 lpt->_rce_candidate = 1; // = true |
0 | 2110 } |
2111 } | |
2112 } | |
2113 } | |
2114 | |
2115 // Check for aggressive application of split-if and other transforms | |
2116 // that require basic-block info (like cloning through Phi's) | |
2117 if( SplitIfBlocks && do_split_ifs ) { | |
2118 visited.Clear(); | |
2119 split_if_with_blocks( visited, nstack ); | |
2120 NOT_PRODUCT( if( VerifyLoopOptimizations ) verify(); ); | |
2121 } | |
2122 | |
1172 | 2123 // Perform loop predication before iteration splitting |
2445 | 2124 if (C->has_loops() && !C->major_progress() && (C->predicate_count() > 0)) { |
1172 | 2125 _ltree_root->_child->loop_predication(this); |
2126 } | |
2127 | |
1763 | 2128 if (OptimizeFill && UseLoopPredicate && C->has_loops() && !C->major_progress()) { |
2129 if (do_intrinsify_fill()) { | |
2130 C->set_major_progress(); | |
2131 } | |
2132 } | |
2133 | |
0 | 2134 // Perform iteration-splitting on inner loops. Split iterations to avoid |
2135 // range checks or one-shot null checks. | |
2136 | |
2137 // If split-if's didn't hack the graph too bad (no CFG changes) | |
2138 // then do loop opts. | |
1172 | 2139 if (C->has_loops() && !C->major_progress()) { |
0 | 2140 memset( worklist.adr(), 0, worklist.Size()*sizeof(Node*) ); |
2141 _ltree_root->_child->iteration_split( this, worklist ); | |
2142 // No verify after peeling! GCM has hoisted code out of the loop. | |
2143 // After peeling, the hoisted code could sink inside the peeled area. | |
2144 // The peeling code does not try to recompute the best location for | |
2145 // all the code before the peeled area, so the verify pass will always | |
2146 // complain about it. | |
2147 } | |
2148 // Do verify graph edges in any case | |
2149 NOT_PRODUCT( C->verify_graph_edges(); ); | |
2150 | |
1172 | 2151 if (!do_split_ifs) { |
0 | 2152 // We saw major progress in Split-If to get here. We forced a |
2153 // pass with unrolling and not split-if, however more split-if's | |
2154 // might make progress. If the unrolling didn't make progress | |
2155 // then the major-progress flag got cleared and we won't try | |
2156 // another round of Split-If. In particular the ever-common | |
2157 // instance-of/check-cast pattern requires at least 2 rounds of | |
2158 // Split-If to clear out. | |
2159 C->set_major_progress(); | |
2160 } | |
2161 | |
2162 // Repeat loop optimizations if new loops were seen | |
2163 if (created_loop_node()) { | |
2164 C->set_major_progress(); | |
2165 } | |
2166 | |
2445 | 2167 // Keep loop predicates and perform optimizations with them |
2168 // until no more loop optimizations could be done. | |
2169 // After that switch predicates off and do more loop optimizations. | |
2170 if (!C->major_progress() && (C->predicate_count() > 0)) { | |
2171 C->cleanup_loop_predicates(_igvn); | |
2172 #ifndef PRODUCT | |
2173 if (TraceLoopOpts) { | |
2174 tty->print_cr("PredicatesOff"); | |
2175 } | |
2176 #endif | |
2177 C->set_major_progress(); | |
2178 } | |
0 | 2179 |
2445 | 2180 // Convert scalar to superword operations at the end of all loop opts. |
0 | 2181 if (UseSuperWord && C->has_loops() && !C->major_progress()) { |
2182 // SuperWord transform | |
2183 SuperWord sw(this); | |
2184 for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) { | |
2185 IdealLoopTree* lpt = iter.current(); | |
2186 if (lpt->is_counted()) { | |
2187 sw.transform_loop(lpt); | |
2188 } | |
2189 } | |
2190 } | |
2191 | |
2192 // Cleanup any modified bits | |
2193 _igvn.optimize(); | |
2194 | |
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2195 // disable assert until issue with split_flow_path is resolved (6742111) |
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2196 // assert(!_has_irreducible_loops || C->parsed_irreducible_loop() || C->is_osr_compilation(), |
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2197 // "shouldn't introduce irreducible loops"); |
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2198 |
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2199 if (C->log() != NULL) { |
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2200 log_loop_tree(_ltree_root, _ltree_root, C->log()); |
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2201 } |
0 | 2202 } |
2203 | |
2204 #ifndef PRODUCT | |
2205 //------------------------------print_statistics------------------------------- | |
2206 int PhaseIdealLoop::_loop_invokes=0;// Count of PhaseIdealLoop invokes | |
2207 int PhaseIdealLoop::_loop_work=0; // Sum of PhaseIdealLoop x unique | |
2208 void PhaseIdealLoop::print_statistics() { | |
2209 tty->print_cr("PhaseIdealLoop=%d, sum _unique=%d", _loop_invokes, _loop_work); | |
2210 } | |
2211 | |
2212 //------------------------------verify----------------------------------------- | |
2213 // Build a verify-only PhaseIdealLoop, and see that it agrees with me. | |
2214 static int fail; // debug only, so its multi-thread dont care | |
2215 void PhaseIdealLoop::verify() const { | |
2216 int old_progress = C->major_progress(); | |
2217 ResourceMark rm; | |
921
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2218 PhaseIdealLoop loop_verify( _igvn, this ); |
0 | 2219 VectorSet visited(Thread::current()->resource_area()); |
2220 | |
2221 fail = 0; | |
2222 verify_compare( C->root(), &loop_verify, visited ); | |
2223 assert( fail == 0, "verify loops failed" ); | |
2224 // Verify loop structure is the same | |
2225 _ltree_root->verify_tree(loop_verify._ltree_root, NULL); | |
2226 // Reset major-progress. It was cleared by creating a verify version of | |
2227 // PhaseIdealLoop. | |
2228 for( int i=0; i<old_progress; i++ ) | |
2229 C->set_major_progress(); | |
2230 } | |
2231 | |
2232 //------------------------------verify_compare--------------------------------- | |
2233 // Make sure me and the given PhaseIdealLoop agree on key data structures | |
2234 void PhaseIdealLoop::verify_compare( Node *n, const PhaseIdealLoop *loop_verify, VectorSet &visited ) const { | |
2235 if( !n ) return; | |
2236 if( visited.test_set( n->_idx ) ) return; | |
2237 if( !_nodes[n->_idx] ) { // Unreachable | |
2238 assert( !loop_verify->_nodes[n->_idx], "both should be unreachable" ); | |
2239 return; | |
2240 } | |
2241 | |
2242 uint i; | |
2243 for( i = 0; i < n->req(); i++ ) | |
2244 verify_compare( n->in(i), loop_verify, visited ); | |
2245 | |
2246 // Check the '_nodes' block/loop structure | |
2247 i = n->_idx; | |
2248 if( has_ctrl(n) ) { // We have control; verify has loop or ctrl | |
2249 if( _nodes[i] != loop_verify->_nodes[i] && | |
2250 get_ctrl_no_update(n) != loop_verify->get_ctrl_no_update(n) ) { | |
2251 tty->print("Mismatched control setting for: "); | |
2252 n->dump(); | |
2253 if( fail++ > 10 ) return; | |
2254 Node *c = get_ctrl_no_update(n); | |
2255 tty->print("We have it as: "); | |
2256 if( c->in(0) ) c->dump(); | |
2257 else tty->print_cr("N%d",c->_idx); | |
2258 tty->print("Verify thinks: "); | |
2259 if( loop_verify->has_ctrl(n) ) | |
2260 loop_verify->get_ctrl_no_update(n)->dump(); | |
2261 else | |
2262 loop_verify->get_loop_idx(n)->dump(); | |
2263 tty->cr(); | |
2264 } | |
2265 } else { // We have a loop | |
2266 IdealLoopTree *us = get_loop_idx(n); | |
2267 if( loop_verify->has_ctrl(n) ) { | |
2268 tty->print("Mismatched loop setting for: "); | |
2269 n->dump(); | |
2270 if( fail++ > 10 ) return; | |
2271 tty->print("We have it as: "); | |
2272 us->dump(); | |
2273 tty->print("Verify thinks: "); | |
2274 loop_verify->get_ctrl_no_update(n)->dump(); | |
2275 tty->cr(); | |
2276 } else if (!C->major_progress()) { | |
2277 // Loop selection can be messed up if we did a major progress | |
2278 // operation, like split-if. Do not verify in that case. | |
2279 IdealLoopTree *them = loop_verify->get_loop_idx(n); | |
2280 if( us->_head != them->_head || us->_tail != them->_tail ) { | |
2281 tty->print("Unequals loops for: "); | |
2282 n->dump(); | |
2283 if( fail++ > 10 ) return; | |
2284 tty->print("We have it as: "); | |
2285 us->dump(); | |
2286 tty->print("Verify thinks: "); | |
2287 them->dump(); | |
2288 tty->cr(); | |
2289 } | |
2290 } | |
2291 } | |
2292 | |
2293 // Check for immediate dominators being equal | |
2294 if( i >= _idom_size ) { | |
2295 if( !n->is_CFG() ) return; | |
2296 tty->print("CFG Node with no idom: "); | |
2297 n->dump(); | |
2298 return; | |
2299 } | |
2300 if( !n->is_CFG() ) return; | |
2301 if( n == C->root() ) return; // No IDOM here | |
2302 | |
2303 assert(n->_idx == i, "sanity"); | |
2304 Node *id = idom_no_update(n); | |
2305 if( id != loop_verify->idom_no_update(n) ) { | |
2306 tty->print("Unequals idoms for: "); | |
2307 n->dump(); | |
2308 if( fail++ > 10 ) return; | |
2309 tty->print("We have it as: "); | |
2310 id->dump(); | |
2311 tty->print("Verify thinks: "); | |
2312 loop_verify->idom_no_update(n)->dump(); | |
2313 tty->cr(); | |
2314 } | |
2315 | |
2316 } | |
2317 | |
2318 //------------------------------verify_tree------------------------------------ | |
2319 // Verify that tree structures match. Because the CFG can change, siblings | |
2320 // within the loop tree can be reordered. We attempt to deal with that by | |
2321 // reordering the verify's loop tree if possible. | |
2322 void IdealLoopTree::verify_tree(IdealLoopTree *loop, const IdealLoopTree *parent) const { | |
2323 assert( _parent == parent, "Badly formed loop tree" ); | |
2324 | |
2325 // Siblings not in same order? Attempt to re-order. | |
2326 if( _head != loop->_head ) { | |
2327 // Find _next pointer to update | |
2328 IdealLoopTree **pp = &loop->_parent->_child; | |
2329 while( *pp != loop ) | |
2330 pp = &((*pp)->_next); | |
2331 // Find proper sibling to be next | |
2332 IdealLoopTree **nn = &loop->_next; | |
2333 while( (*nn) && (*nn)->_head != _head ) | |
2334 nn = &((*nn)->_next); | |
2335 | |
2336 // Check for no match. | |
2337 if( !(*nn) ) { | |
2338 // Annoyingly, irreducible loops can pick different headers | |
2339 // after a major_progress operation, so the rest of the loop | |
2340 // tree cannot be matched. | |
2341 if (_irreducible && Compile::current()->major_progress()) return; | |
2342 assert( 0, "failed to match loop tree" ); | |
2343 } | |
2344 | |
2345 // Move (*nn) to (*pp) | |
2346 IdealLoopTree *hit = *nn; | |
2347 *nn = hit->_next; | |
2348 hit->_next = loop; | |
2349 *pp = loop; | |
2350 loop = hit; | |
2351 // Now try again to verify | |
2352 } | |
2353 | |
2354 assert( _head == loop->_head , "mismatched loop head" ); | |
2355 Node *tail = _tail; // Inline a non-updating version of | |
2356 while( !tail->in(0) ) // the 'tail()' call. | |
2357 tail = tail->in(1); | |
2358 assert( tail == loop->_tail, "mismatched loop tail" ); | |
2359 | |
2360 // Counted loops that are guarded should be able to find their guards | |
2361 if( _head->is_CountedLoop() && _head->as_CountedLoop()->is_main_loop() ) { | |
2362 CountedLoopNode *cl = _head->as_CountedLoop(); | |
2363 Node *init = cl->init_trip(); | |
2364 Node *ctrl = cl->in(LoopNode::EntryControl); | |
2365 assert( ctrl->Opcode() == Op_IfTrue || ctrl->Opcode() == Op_IfFalse, "" ); | |
2366 Node *iff = ctrl->in(0); | |
2367 assert( iff->Opcode() == Op_If, "" ); | |
2368 Node *bol = iff->in(1); | |
2369 assert( bol->Opcode() == Op_Bool, "" ); | |
2370 Node *cmp = bol->in(1); | |
2371 assert( cmp->Opcode() == Op_CmpI, "" ); | |
2372 Node *add = cmp->in(1); | |
2373 Node *opaq; | |
2374 if( add->Opcode() == Op_Opaque1 ) { | |
2375 opaq = add; | |
2376 } else { | |
2377 assert( add->Opcode() == Op_AddI || add->Opcode() == Op_ConI , "" ); | |
2378 assert( add == init, "" ); | |
2379 opaq = cmp->in(2); | |
2380 } | |
2381 assert( opaq->Opcode() == Op_Opaque1, "" ); | |
2382 | |
2383 } | |
2384 | |
2385 if (_child != NULL) _child->verify_tree(loop->_child, this); | |
2386 if (_next != NULL) _next ->verify_tree(loop->_next, parent); | |
2387 // Innermost loops need to verify loop bodies, | |
2388 // but only if no 'major_progress' | |
2389 int fail = 0; | |
2390 if (!Compile::current()->major_progress() && _child == NULL) { | |
2391 for( uint i = 0; i < _body.size(); i++ ) { | |
2392 Node *n = _body.at(i); | |
2393 if (n->outcnt() == 0) continue; // Ignore dead | |
2394 uint j; | |
2395 for( j = 0; j < loop->_body.size(); j++ ) | |
2396 if( loop->_body.at(j) == n ) | |
2397 break; | |
2398 if( j == loop->_body.size() ) { // Not found in loop body | |
2399 // Last ditch effort to avoid assertion: Its possible that we | |
2400 // have some users (so outcnt not zero) but are still dead. | |
2401 // Try to find from root. | |
2402 if (Compile::current()->root()->find(n->_idx)) { | |
2403 fail++; | |
2404 tty->print("We have that verify does not: "); | |
2405 n->dump(); | |
2406 } | |
2407 } | |
2408 } | |
2409 for( uint i2 = 0; i2 < loop->_body.size(); i2++ ) { | |
2410 Node *n = loop->_body.at(i2); | |
2411 if (n->outcnt() == 0) continue; // Ignore dead | |
2412 uint j; | |
2413 for( j = 0; j < _body.size(); j++ ) | |
2414 if( _body.at(j) == n ) | |
2415 break; | |
2416 if( j == _body.size() ) { // Not found in loop body | |
2417 // Last ditch effort to avoid assertion: Its possible that we | |
2418 // have some users (so outcnt not zero) but are still dead. | |
2419 // Try to find from root. | |
2420 if (Compile::current()->root()->find(n->_idx)) { | |
2421 fail++; | |
2422 tty->print("Verify has that we do not: "); | |
2423 n->dump(); | |
2424 } | |
2425 } | |
2426 } | |
2427 assert( !fail, "loop body mismatch" ); | |
2428 } | |
2429 } | |
2430 | |
2431 #endif | |
2432 | |
2433 //------------------------------set_idom--------------------------------------- | |
2434 void PhaseIdealLoop::set_idom(Node* d, Node* n, uint dom_depth) { | |
2435 uint idx = d->_idx; | |
2436 if (idx >= _idom_size) { | |
2437 uint newsize = _idom_size<<1; | |
2438 while( idx >= newsize ) { | |
2439 newsize <<= 1; | |
2440 } | |
2441 _idom = REALLOC_RESOURCE_ARRAY( Node*, _idom,_idom_size,newsize); | |
2442 _dom_depth = REALLOC_RESOURCE_ARRAY( uint, _dom_depth,_idom_size,newsize); | |
2443 memset( _dom_depth + _idom_size, 0, (newsize - _idom_size) * sizeof(uint) ); | |
2444 _idom_size = newsize; | |
2445 } | |
2446 _idom[idx] = n; | |
2447 _dom_depth[idx] = dom_depth; | |
2448 } | |
2449 | |
2450 //------------------------------recompute_dom_depth--------------------------------------- | |
2451 // The dominator tree is constructed with only parent pointers. | |
2452 // This recomputes the depth in the tree by first tagging all | |
2453 // nodes as "no depth yet" marker. The next pass then runs up | |
2454 // the dom tree from each node marked "no depth yet", and computes | |
2455 // the depth on the way back down. | |
2456 void PhaseIdealLoop::recompute_dom_depth() { | |
2457 uint no_depth_marker = C->unique(); | |
2458 uint i; | |
2459 // Initialize depth to "no depth yet" | |
2460 for (i = 0; i < _idom_size; i++) { | |
2461 if (_dom_depth[i] > 0 && _idom[i] != NULL) { | |
2462 _dom_depth[i] = no_depth_marker; | |
2463 } | |
2464 } | |
2465 if (_dom_stk == NULL) { | |
2466 uint init_size = C->unique() / 100; // Guess that 1/100 is a reasonable initial size. | |
2467 if (init_size < 10) init_size = 10; | |
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2468 _dom_stk = new GrowableArray<uint>(init_size); |
0 | 2469 } |
2470 // Compute new depth for each node. | |
2471 for (i = 0; i < _idom_size; i++) { | |
2472 uint j = i; | |
2473 // Run up the dom tree to find a node with a depth | |
2474 while (_dom_depth[j] == no_depth_marker) { | |
2475 _dom_stk->push(j); | |
2476 j = _idom[j]->_idx; | |
2477 } | |
2478 // Compute the depth on the way back down this tree branch | |
2479 uint dd = _dom_depth[j] + 1; | |
2480 while (_dom_stk->length() > 0) { | |
2481 uint j = _dom_stk->pop(); | |
2482 _dom_depth[j] = dd; | |
2483 dd++; | |
2484 } | |
2485 } | |
2486 } | |
2487 | |
2488 //------------------------------sort------------------------------------------- | |
2489 // Insert 'loop' into the existing loop tree. 'innermost' is a leaf of the | |
2490 // loop tree, not the root. | |
2491 IdealLoopTree *PhaseIdealLoop::sort( IdealLoopTree *loop, IdealLoopTree *innermost ) { | |
2492 if( !innermost ) return loop; // New innermost loop | |
2493 | |
2494 int loop_preorder = get_preorder(loop->_head); // Cache pre-order number | |
2495 assert( loop_preorder, "not yet post-walked loop" ); | |
2496 IdealLoopTree **pp = &innermost; // Pointer to previous next-pointer | |
2497 IdealLoopTree *l = *pp; // Do I go before or after 'l'? | |
2498 | |
2499 // Insert at start of list | |
2500 while( l ) { // Insertion sort based on pre-order | |
2501 if( l == loop ) return innermost; // Already on list! | |
2502 int l_preorder = get_preorder(l->_head); // Cache pre-order number | |
2503 assert( l_preorder, "not yet post-walked l" ); | |
2504 // Check header pre-order number to figure proper nesting | |
2505 if( loop_preorder > l_preorder ) | |
2506 break; // End of insertion | |
2507 // If headers tie (e.g., shared headers) check tail pre-order numbers. | |
2508 // Since I split shared headers, you'd think this could not happen. | |
2509 // BUT: I must first do the preorder numbering before I can discover I | |
2510 // have shared headers, so the split headers all get the same preorder | |
2511 // number as the RegionNode they split from. | |
2512 if( loop_preorder == l_preorder && | |
2513 get_preorder(loop->_tail) < get_preorder(l->_tail) ) | |
2514 break; // Also check for shared headers (same pre#) | |
2515 pp = &l->_parent; // Chain up list | |
2516 l = *pp; | |
2517 } | |
2518 // Link into list | |
2519 // Point predecessor to me | |
2520 *pp = loop; | |
2521 // Point me to successor | |
2522 IdealLoopTree *p = loop->_parent; | |
2523 loop->_parent = l; // Point me to successor | |
2524 if( p ) sort( p, innermost ); // Insert my parents into list as well | |
2525 return innermost; | |
2526 } | |
2527 | |
2528 //------------------------------build_loop_tree-------------------------------- | |
2529 // I use a modified Vick/Tarjan algorithm. I need pre- and a post- visit | |
2530 // bits. The _nodes[] array is mapped by Node index and holds a NULL for | |
2531 // not-yet-pre-walked, pre-order # for pre-but-not-post-walked and holds the | |
2532 // tightest enclosing IdealLoopTree for post-walked. | |
2533 // | |
2534 // During my forward walk I do a short 1-layer lookahead to see if I can find | |
2535 // a loop backedge with that doesn't have any work on the backedge. This | |
2536 // helps me construct nested loops with shared headers better. | |
2537 // | |
2538 // Once I've done the forward recursion, I do the post-work. For each child | |
2539 // I check to see if there is a backedge. Backedges define a loop! I | |
2540 // insert an IdealLoopTree at the target of the backedge. | |
2541 // | |
2542 // During the post-work I also check to see if I have several children | |
2543 // belonging to different loops. If so, then this Node is a decision point | |
2544 // where control flow can choose to change loop nests. It is at this | |
2545 // decision point where I can figure out how loops are nested. At this | |
2546 // time I can properly order the different loop nests from my children. | |
2547 // Note that there may not be any backedges at the decision point! | |
2548 // | |
2549 // Since the decision point can be far removed from the backedges, I can't | |
2550 // order my loops at the time I discover them. Thus at the decision point | |
2551 // I need to inspect loop header pre-order numbers to properly nest my | |
2552 // loops. This means I need to sort my childrens' loops by pre-order. | |
2553 // The sort is of size number-of-control-children, which generally limits | |
2554 // it to size 2 (i.e., I just choose between my 2 target loops). | |
2555 void PhaseIdealLoop::build_loop_tree() { | |
2556 // Allocate stack of size C->unique()/2 to avoid frequent realloc | |
2557 GrowableArray <Node *> bltstack(C->unique() >> 1); | |
2558 Node *n = C->root(); | |
2559 bltstack.push(n); | |
2560 int pre_order = 1; | |
2561 int stack_size; | |
2562 | |
2563 while ( ( stack_size = bltstack.length() ) != 0 ) { | |
2564 n = bltstack.top(); // Leave node on stack | |
2565 if ( !is_visited(n) ) { | |
2566 // ---- Pre-pass Work ---- | |
2567 // Pre-walked but not post-walked nodes need a pre_order number. | |
2568 | |
2569 set_preorder_visited( n, pre_order ); // set as visited | |
2570 | |
2571 // ---- Scan over children ---- | |
2572 // Scan first over control projections that lead to loop headers. | |
2573 // This helps us find inner-to-outer loops with shared headers better. | |
2574 | |
2575 // Scan children's children for loop headers. | |
2576 for ( int i = n->outcnt() - 1; i >= 0; --i ) { | |
2577 Node* m = n->raw_out(i); // Child | |
2578 if( m->is_CFG() && !is_visited(m) ) { // Only for CFG children | |
2579 // Scan over children's children to find loop | |
2580 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
2581 Node* l = m->fast_out(j); | |
2582 if( is_visited(l) && // Been visited? | |
2583 !is_postvisited(l) && // But not post-visited | |
2584 get_preorder(l) < pre_order ) { // And smaller pre-order | |
2585 // Found! Scan the DFS down this path before doing other paths | |
2586 bltstack.push(m); | |
2587 break; | |
2588 } | |
2589 } | |
2590 } | |
2591 } | |
2592 pre_order++; | |
2593 } | |
2594 else if ( !is_postvisited(n) ) { | |
2595 // Note: build_loop_tree_impl() adds out edges on rare occasions, | |
2596 // such as com.sun.rsasign.am::a. | |
2597 // For non-recursive version, first, process current children. | |
2598 // On next iteration, check if additional children were added. | |
2599 for ( int k = n->outcnt() - 1; k >= 0; --k ) { | |
2600 Node* u = n->raw_out(k); | |
2601 if ( u->is_CFG() && !is_visited(u) ) { | |
2602 bltstack.push(u); | |
2603 } | |
2604 } | |
2605 if ( bltstack.length() == stack_size ) { | |
2606 // There were no additional children, post visit node now | |
2607 (void)bltstack.pop(); // Remove node from stack | |
2608 pre_order = build_loop_tree_impl( n, pre_order ); | |
2609 // Check for bailout | |
2610 if (C->failing()) { | |
2611 return; | |
2612 } | |
2613 // Check to grow _preorders[] array for the case when | |
2614 // build_loop_tree_impl() adds new nodes. | |
2615 check_grow_preorders(); | |
2616 } | |
2617 } | |
2618 else { | |
2619 (void)bltstack.pop(); // Remove post-visited node from stack | |
2620 } | |
2621 } | |
2622 } | |
2623 | |
2624 //------------------------------build_loop_tree_impl--------------------------- | |
2625 int PhaseIdealLoop::build_loop_tree_impl( Node *n, int pre_order ) { | |
2626 // ---- Post-pass Work ---- | |
2627 // Pre-walked but not post-walked nodes need a pre_order number. | |
2628 | |
2629 // Tightest enclosing loop for this Node | |
2630 IdealLoopTree *innermost = NULL; | |
2631 | |
2632 // For all children, see if any edge is a backedge. If so, make a loop | |
2633 // for it. Then find the tightest enclosing loop for the self Node. | |
2634 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2635 Node* m = n->fast_out(i); // Child | |
2636 if( n == m ) continue; // Ignore control self-cycles | |
2637 if( !m->is_CFG() ) continue;// Ignore non-CFG edges | |
2638 | |
2639 IdealLoopTree *l; // Child's loop | |
2640 if( !is_postvisited(m) ) { // Child visited but not post-visited? | |
2641 // Found a backedge | |
2642 assert( get_preorder(m) < pre_order, "should be backedge" ); | |
2643 // Check for the RootNode, which is already a LoopNode and is allowed | |
2644 // to have multiple "backedges". | |
2645 if( m == C->root()) { // Found the root? | |
2646 l = _ltree_root; // Root is the outermost LoopNode | |
2647 } else { // Else found a nested loop | |
2648 // Insert a LoopNode to mark this loop. | |
2649 l = new IdealLoopTree(this, m, n); | |
2650 } // End of Else found a nested loop | |
2651 if( !has_loop(m) ) // If 'm' does not already have a loop set | |
2652 set_loop(m, l); // Set loop header to loop now | |
2653 | |
2654 } else { // Else not a nested loop | |
2655 if( !_nodes[m->_idx] ) continue; // Dead code has no loop | |
2656 l = get_loop(m); // Get previously determined loop | |
2657 // If successor is header of a loop (nest), move up-loop till it | |
2658 // is a member of some outer enclosing loop. Since there are no | |
2659 // shared headers (I've split them already) I only need to go up | |
2660 // at most 1 level. | |
2661 while( l && l->_head == m ) // Successor heads loop? | |
2662 l = l->_parent; // Move up 1 for me | |
2663 // If this loop is not properly parented, then this loop | |
2664 // has no exit path out, i.e. its an infinite loop. | |
2665 if( !l ) { | |
2666 // Make loop "reachable" from root so the CFG is reachable. Basically | |
2667 // insert a bogus loop exit that is never taken. 'm', the loop head, | |
2668 // points to 'n', one (of possibly many) fall-in paths. There may be | |
2669 // many backedges as well. | |
2670 | |
2671 // Here I set the loop to be the root loop. I could have, after | |
2672 // inserting a bogus loop exit, restarted the recursion and found my | |
2673 // new loop exit. This would make the infinite loop a first-class | |
2674 // loop and it would then get properly optimized. What's the use of | |
2675 // optimizing an infinite loop? | |
2676 l = _ltree_root; // Oops, found infinite loop | |
2677 | |
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2678 if (!_verify_only) { |
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2679 // Insert the NeverBranch between 'm' and it's control user. |
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2680 NeverBranchNode *iff = new (C) NeverBranchNode( m ); |
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2681 _igvn.register_new_node_with_optimizer(iff); |
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2682 set_loop(iff, l); |
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2683 Node *if_t = new (C) CProjNode( iff, 0 ); |
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2684 _igvn.register_new_node_with_optimizer(if_t); |
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2685 set_loop(if_t, l); |
0 | 2686 |
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2687 Node* cfg = NULL; // Find the One True Control User of m |
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2688 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { |
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2689 Node* x = m->fast_out(j); |
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2690 if (x->is_CFG() && x != m && x != iff) |
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2691 { cfg = x; break; } |
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2692 } |
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2693 assert(cfg != NULL, "must find the control user of m"); |
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2694 uint k = 0; // Probably cfg->in(0) |
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2695 while( cfg->in(k) != m ) k++; // But check incase cfg is a Region |
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2696 cfg->set_req( k, if_t ); // Now point to NeverBranch |
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2697 |
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2698 // Now create the never-taken loop exit |
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2699 Node *if_f = new (C) CProjNode( iff, 1 ); |
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2700 _igvn.register_new_node_with_optimizer(if_f); |
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2701 set_loop(if_f, l); |
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2702 // Find frame ptr for Halt. Relies on the optimizer |
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2703 // V-N'ing. Easier and quicker than searching through |
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2704 // the program structure. |
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2705 Node *frame = new (C) ParmNode( C->start(), TypeFunc::FramePtr ); |
921
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2706 _igvn.register_new_node_with_optimizer(frame); |
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2707 // Halt & Catch Fire |
6804
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2708 Node *halt = new (C) HaltNode( if_f, frame ); |
921
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2709 _igvn.register_new_node_with_optimizer(halt); |
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2710 set_loop(halt, l); |
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2711 C->root()->add_req(halt); |
0 | 2712 } |
2713 set_loop(C->root(), _ltree_root); | |
2714 } | |
2715 } | |
2716 // Weeny check for irreducible. This child was already visited (this | |
2717 // IS the post-work phase). Is this child's loop header post-visited | |
2718 // as well? If so, then I found another entry into the loop. | |
921
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2719 if (!_verify_only) { |
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2720 while( is_postvisited(l->_head) ) { |
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2721 // found irreducible |
046932b72aa2
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2722 l->_irreducible = 1; // = true |
046932b72aa2
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2723 l = l->_parent; |
046932b72aa2
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2724 _has_irreducible_loops = true; |
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2725 // Check for bad CFG here to prevent crash, and bailout of compile |
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2726 if (l == NULL) { |
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2727 C->record_method_not_compilable("unhandled CFG detected during loop optimization"); |
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2728 return pre_order; |
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2729 } |
0 | 2730 } |
2731 } | |
2732 | |
2733 // This Node might be a decision point for loops. It is only if | |
2734 // it's children belong to several different loops. The sort call | |
2735 // does a trivial amount of work if there is only 1 child or all | |
2736 // children belong to the same loop. If however, the children | |
2737 // belong to different loops, the sort call will properly set the | |
2738 // _parent pointers to show how the loops nest. | |
2739 // | |
2740 // In any case, it returns the tightest enclosing loop. | |
2741 innermost = sort( l, innermost ); | |
2742 } | |
2743 | |
2744 // Def-use info will have some dead stuff; dead stuff will have no | |
2745 // loop decided on. | |
2746 | |
2747 // Am I a loop header? If so fix up my parent's child and next ptrs. | |
2748 if( innermost && innermost->_head == n ) { | |
2749 assert( get_loop(n) == innermost, "" ); | |
2750 IdealLoopTree *p = innermost->_parent; | |
2751 IdealLoopTree *l = innermost; | |
2752 while( p && l->_head == n ) { | |
2753 l->_next = p->_child; // Put self on parents 'next child' | |
2754 p->_child = l; // Make self as first child of parent | |
2755 l = p; // Now walk up the parent chain | |
2756 p = l->_parent; | |
2757 } | |
2758 } else { | |
2759 // Note that it is possible for a LoopNode to reach here, if the | |
2760 // backedge has been made unreachable (hence the LoopNode no longer | |
2761 // denotes a Loop, and will eventually be removed). | |
2762 | |
2763 // Record tightest enclosing loop for self. Mark as post-visited. | |
2764 set_loop(n, innermost); | |
2765 // Also record has_call flag early on | |
2766 if( innermost ) { | |
2767 if( n->is_Call() && !n->is_CallLeaf() && !n->is_macro() ) { | |
2768 // Do not count uncommon calls | |
2769 if( !n->is_CallStaticJava() || !n->as_CallStaticJava()->_name ) { | |
2770 Node *iff = n->in(0)->in(0); | |
6179
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2771 // No any calls for vectorized loops. |
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2772 if( UseSuperWord || !iff->is_If() || |
0 | 2773 (n->in(0)->Opcode() == Op_IfFalse && |
2774 (1.0 - iff->as_If()->_prob) >= 0.01) || | |
2775 (iff->as_If()->_prob >= 0.01) ) | |
2776 innermost->_has_call = 1; | |
2777 } | |
39
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2778 } else if( n->is_Allocate() && n->as_Allocate()->_is_scalar_replaceable ) { |
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2779 // Disable loop optimizations if the loop has a scalar replaceable |
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2780 // allocation. This disabling may cause a potential performance lost |
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2781 // if the allocation is not eliminated for some reason. |
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2782 innermost->_allow_optimizations = false; |
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2783 innermost->_has_call = 1; // = true |
6636 | 2784 } else if (n->Opcode() == Op_SafePoint) { |
2785 // Record all safepoints in this loop. | |
2786 if (innermost->_safepts == NULL) innermost->_safepts = new Node_List(); | |
2787 innermost->_safepts->push(n); | |
0 | 2788 } |
2789 } | |
2790 } | |
2791 | |
2792 // Flag as post-visited now | |
2793 set_postvisited(n); | |
2794 return pre_order; | |
2795 } | |
2796 | |
2797 | |
2798 //------------------------------build_loop_early------------------------------- | |
2799 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
2800 // First pass computes the earliest controlling node possible. This is the | |
2801 // controlling input with the deepest dominating depth. | |
921
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2802 void PhaseIdealLoop::build_loop_early( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) { |
0 | 2803 while (worklist.size() != 0) { |
2804 // Use local variables nstack_top_n & nstack_top_i to cache values | |
2805 // on nstack's top. | |
2806 Node *nstack_top_n = worklist.pop(); | |
2807 uint nstack_top_i = 0; | |
2808 //while_nstack_nonempty: | |
2809 while (true) { | |
2810 // Get parent node and next input's index from stack's top. | |
2811 Node *n = nstack_top_n; | |
2812 uint i = nstack_top_i; | |
2813 uint cnt = n->req(); // Count of inputs | |
2814 if (i == 0) { // Pre-process the node. | |
2815 if( has_node(n) && // Have either loop or control already? | |
2816 !has_ctrl(n) ) { // Have loop picked out already? | |
2817 // During "merge_many_backedges" we fold up several nested loops | |
2818 // into a single loop. This makes the members of the original | |
2819 // loop bodies pointing to dead loops; they need to move up | |
2820 // to the new UNION'd larger loop. I set the _head field of these | |
2821 // dead loops to NULL and the _parent field points to the owning | |
2822 // loop. Shades of UNION-FIND algorithm. | |
2823 IdealLoopTree *ilt; | |
2824 while( !(ilt = get_loop(n))->_head ) { | |
2825 // Normally I would use a set_loop here. But in this one special | |
2826 // case, it is legal (and expected) to change what loop a Node | |
2827 // belongs to. | |
2828 _nodes.map(n->_idx, (Node*)(ilt->_parent) ); | |
2829 } | |
2830 // Remove safepoints ONLY if I've already seen I don't need one. | |
2831 // (the old code here would yank a 2nd safepoint after seeing a | |
2832 // first one, even though the 1st did not dominate in the loop body | |
2833 // and thus could be avoided indefinitely) | |
921
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2834 if( !_verify_only && !_verify_me && ilt->_has_sfpt && n->Opcode() == Op_SafePoint && |
0 | 2835 is_deleteable_safept(n)) { |
2836 Node *in = n->in(TypeFunc::Control); | |
2837 lazy_replace(n,in); // Pull safepoint now | |
6636 | 2838 if (ilt->_safepts != NULL) { |
2839 ilt->_safepts->yank(n); | |
2840 } | |
0 | 2841 // Carry on with the recursion "as if" we are walking |
2842 // only the control input | |
2843 if( !visited.test_set( in->_idx ) ) { | |
2844 worklist.push(in); // Visit this guy later, using worklist | |
2845 } | |
2846 // Get next node from nstack: | |
2847 // - skip n's inputs processing by setting i > cnt; | |
2848 // - we also will not call set_early_ctrl(n) since | |
2849 // has_node(n) == true (see the condition above). | |
2850 i = cnt + 1; | |
2851 } | |
2852 } | |
2853 } // if (i == 0) | |
2854 | |
2855 // Visit all inputs | |
2856 bool done = true; // Assume all n's inputs will be processed | |
2857 while (i < cnt) { | |
2858 Node *in = n->in(i); | |
2859 ++i; | |
2860 if (in == NULL) continue; | |
2861 if (in->pinned() && !in->is_CFG()) | |
2862 set_ctrl(in, in->in(0)); | |
2863 int is_visited = visited.test_set( in->_idx ); | |
2864 if (!has_node(in)) { // No controlling input yet? | |
2865 assert( !in->is_CFG(), "CFG Node with no controlling input?" ); | |
2866 assert( !is_visited, "visit only once" ); | |
2867 nstack.push(n, i); // Save parent node and next input's index. | |
2868 nstack_top_n = in; // Process current input now. | |
2869 nstack_top_i = 0; | |
2870 done = false; // Not all n's inputs processed. | |
2871 break; // continue while_nstack_nonempty; | |
2872 } else if (!is_visited) { | |
2873 // This guy has a location picked out for him, but has not yet | |
2874 // been visited. Happens to all CFG nodes, for instance. | |
2875 // Visit him using the worklist instead of recursion, to break | |
2876 // cycles. Since he has a location already we do not need to | |
2877 // find his location before proceeding with the current Node. | |
2878 worklist.push(in); // Visit this guy later, using worklist | |
2879 } | |
2880 } | |
2881 if (done) { | |
2882 // All of n's inputs have been processed, complete post-processing. | |
2883 | |
605 | 2884 // Compute earliest point this Node can go. |
0 | 2885 // CFG, Phi, pinned nodes already know their controlling input. |
2886 if (!has_node(n)) { | |
2887 // Record earliest legal location | |
2888 set_early_ctrl( n ); | |
2889 } | |
2890 if (nstack.is_empty()) { | |
2891 // Finished all nodes on stack. | |
2892 // Process next node on the worklist. | |
2893 break; | |
2894 } | |
2895 // Get saved parent node and next input's index. | |
2896 nstack_top_n = nstack.node(); | |
2897 nstack_top_i = nstack.index(); | |
2898 nstack.pop(); | |
2899 } | |
2900 } // while (true) | |
2901 } | |
2902 } | |
2903 | |
2904 //------------------------------dom_lca_internal-------------------------------- | |
2905 // Pair-wise LCA | |
2906 Node *PhaseIdealLoop::dom_lca_internal( Node *n1, Node *n2 ) const { | |
2907 if( !n1 ) return n2; // Handle NULL original LCA | |
2908 assert( n1->is_CFG(), "" ); | |
2909 assert( n2->is_CFG(), "" ); | |
2910 // find LCA of all uses | |
2911 uint d1 = dom_depth(n1); | |
2912 uint d2 = dom_depth(n2); | |
2913 while (n1 != n2) { | |
2914 if (d1 > d2) { | |
2915 n1 = idom(n1); | |
2916 d1 = dom_depth(n1); | |
2917 } else if (d1 < d2) { | |
2918 n2 = idom(n2); | |
2919 d2 = dom_depth(n2); | |
2920 } else { | |
2921 // Here d1 == d2. Due to edits of the dominator-tree, sections | |
2922 // of the tree might have the same depth. These sections have | |
2923 // to be searched more carefully. | |
2924 | |
2925 // Scan up all the n1's with equal depth, looking for n2. | |
2926 Node *t1 = idom(n1); | |
2927 while (dom_depth(t1) == d1) { | |
2928 if (t1 == n2) return n2; | |
2929 t1 = idom(t1); | |
2930 } | |
2931 // Scan up all the n2's with equal depth, looking for n1. | |
2932 Node *t2 = idom(n2); | |
2933 while (dom_depth(t2) == d2) { | |
2934 if (t2 == n1) return n1; | |
2935 t2 = idom(t2); | |
2936 } | |
2937 // Move up to a new dominator-depth value as well as up the dom-tree. | |
2938 n1 = t1; | |
2939 n2 = t2; | |
2940 d1 = dom_depth(n1); | |
2941 d2 = dom_depth(n2); | |
2942 } | |
2943 } | |
2944 return n1; | |
2945 } | |
2946 | |
2947 //------------------------------compute_idom----------------------------------- | |
2948 // Locally compute IDOM using dom_lca call. Correct only if the incoming | |
2949 // IDOMs are correct. | |
2950 Node *PhaseIdealLoop::compute_idom( Node *region ) const { | |
2951 assert( region->is_Region(), "" ); | |
2952 Node *LCA = NULL; | |
2953 for( uint i = 1; i < region->req(); i++ ) { | |
2954 if( region->in(i) != C->top() ) | |
2955 LCA = dom_lca( LCA, region->in(i) ); | |
2956 } | |
2957 return LCA; | |
2958 } | |
2959 | |
921
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2960 bool PhaseIdealLoop::verify_dominance(Node* n, Node* use, Node* LCA, Node* early) { |
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2961 bool had_error = false; |
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2962 #ifdef ASSERT |
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2963 if (early != C->root()) { |
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2964 // Make sure that there's a dominance path from use to LCA |
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2965 Node* d = use; |
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2966 while (d != LCA) { |
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|
2967 d = idom(d); |
046932b72aa2
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2968 if (d == C->root()) { |
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|
2969 tty->print_cr("*** Use %d isn't dominated by def %s", use->_idx, n->_idx); |
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2970 n->dump(); |
046932b72aa2
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diff
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|
2971 use->dump(); |
046932b72aa2
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|
2972 had_error = true; |
046932b72aa2
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|
2973 break; |
046932b72aa2
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|
2974 } |
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|
2975 } |
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|
2976 } |
046932b72aa2
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|
2977 #endif |
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|
2978 return had_error; |
046932b72aa2
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|
2979 } |
0 | 2980 |
921
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2981 |
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2982 Node* PhaseIdealLoop::compute_lca_of_uses(Node* n, Node* early, bool verify) { |
0 | 2983 // Compute LCA over list of uses |
921
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2984 bool had_error = false; |
0 | 2985 Node *LCA = NULL; |
2986 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax && LCA != early; i++) { | |
2987 Node* c = n->fast_out(i); | |
2988 if (_nodes[c->_idx] == NULL) | |
2989 continue; // Skip the occasional dead node | |
2990 if( c->is_Phi() ) { // For Phis, we must land above on the path | |
2991 for( uint j=1; j<c->req(); j++ ) {// For all inputs | |
2992 if( c->in(j) == n ) { // Found matching input? | |
2993 Node *use = c->in(0)->in(j); | |
921
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2994 if (_verify_only && use->is_top()) continue; |
0 | 2995 LCA = dom_lca_for_get_late_ctrl( LCA, use, n ); |
921
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2996 if (verify) had_error = verify_dominance(n, use, LCA, early) || had_error; |
0 | 2997 } |
2998 } | |
2999 } else { | |
3000 // For CFG data-users, use is in the block just prior | |
3001 Node *use = has_ctrl(c) ? get_ctrl(c) : c->in(0); | |
3002 LCA = dom_lca_for_get_late_ctrl( LCA, use, n ); | |
921
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3003 if (verify) had_error = verify_dominance(n, use, LCA, early) || had_error; |
0 | 3004 } |
3005 } | |
921
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3006 assert(!had_error, "bad dominance"); |
046932b72aa2
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|
3007 return LCA; |
046932b72aa2
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|
3008 } |
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|
3009 |
046932b72aa2
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|
3010 //------------------------------get_late_ctrl---------------------------------- |
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3011 // Compute latest legal control. |
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3012 Node *PhaseIdealLoop::get_late_ctrl( Node *n, Node *early ) { |
046932b72aa2
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3013 assert(early != NULL, "early control should not be NULL"); |
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|
3014 |
046932b72aa2
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3015 Node* LCA = compute_lca_of_uses(n, early); |
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|
3016 #ifdef ASSERT |
046932b72aa2
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3017 if (LCA == C->root() && LCA != early) { |
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|
3018 // def doesn't dominate uses so print some useful debugging output |
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3019 compute_lca_of_uses(n, early, true); |
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3020 } |
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3021 #endif |
0 | 3022 |
3023 // if this is a load, check for anti-dependent stores | |
3024 // We use a conservative algorithm to identify potential interfering | |
3025 // instructions and for rescheduling the load. The users of the memory | |
3026 // input of this load are examined. Any use which is not a load and is | |
3027 // dominated by early is considered a potentially interfering store. | |
3028 // This can produce false positives. | |
3029 if (n->is_Load() && LCA != early) { | |
3030 Node_List worklist; | |
3031 | |
3032 Node *mem = n->in(MemNode::Memory); | |
3033 for (DUIterator_Fast imax, i = mem->fast_outs(imax); i < imax; i++) { | |
3034 Node* s = mem->fast_out(i); | |
3035 worklist.push(s); | |
3036 } | |
3037 while(worklist.size() != 0 && LCA != early) { | |
3038 Node* s = worklist.pop(); | |
3039 if (s->is_Load()) { | |
3040 continue; | |
3041 } else if (s->is_MergeMem()) { | |
3042 for (DUIterator_Fast imax, i = s->fast_outs(imax); i < imax; i++) { | |
3043 Node* s1 = s->fast_out(i); | |
3044 worklist.push(s1); | |
3045 } | |
3046 } else { | |
3047 Node *sctrl = has_ctrl(s) ? get_ctrl(s) : s->in(0); | |
3048 assert(sctrl != NULL || s->outcnt() == 0, "must have control"); | |
3049 if (sctrl != NULL && !sctrl->is_top() && is_dominator(early, sctrl)) { | |
3050 LCA = dom_lca_for_get_late_ctrl(LCA, sctrl, n); | |
3051 } | |
3052 } | |
3053 } | |
3054 } | |
3055 | |
3056 assert(LCA == find_non_split_ctrl(LCA), "unexpected late control"); | |
3057 return LCA; | |
3058 } | |
3059 | |
3060 // true if CFG node d dominates CFG node n | |
3061 bool PhaseIdealLoop::is_dominator(Node *d, Node *n) { | |
3062 if (d == n) | |
3063 return true; | |
3064 assert(d->is_CFG() && n->is_CFG(), "must have CFG nodes"); | |
3065 uint dd = dom_depth(d); | |
3066 while (dom_depth(n) >= dd) { | |
3067 if (n == d) | |
3068 return true; | |
3069 n = idom(n); | |
3070 } | |
3071 return false; | |
3072 } | |
3073 | |
3074 //------------------------------dom_lca_for_get_late_ctrl_internal------------- | |
3075 // Pair-wise LCA with tags. | |
3076 // Tag each index with the node 'tag' currently being processed | |
3077 // before advancing up the dominator chain using idom(). | |
3078 // Later calls that find a match to 'tag' know that this path has already | |
3079 // been considered in the current LCA (which is input 'n1' by convention). | |
3080 // Since get_late_ctrl() is only called once for each node, the tag array | |
3081 // does not need to be cleared between calls to get_late_ctrl(). | |
3082 // Algorithm trades a larger constant factor for better asymptotic behavior | |
3083 // | |
3084 Node *PhaseIdealLoop::dom_lca_for_get_late_ctrl_internal( Node *n1, Node *n2, Node *tag ) { | |
3085 uint d1 = dom_depth(n1); | |
3086 uint d2 = dom_depth(n2); | |
3087 | |
3088 do { | |
3089 if (d1 > d2) { | |
3090 // current lca is deeper than n2 | |
3091 _dom_lca_tags.map(n1->_idx, tag); | |
3092 n1 = idom(n1); | |
3093 d1 = dom_depth(n1); | |
3094 } else if (d1 < d2) { | |
3095 // n2 is deeper than current lca | |
3096 Node *memo = _dom_lca_tags[n2->_idx]; | |
3097 if( memo == tag ) { | |
3098 return n1; // Return the current LCA | |
3099 } | |
3100 _dom_lca_tags.map(n2->_idx, tag); | |
3101 n2 = idom(n2); | |
3102 d2 = dom_depth(n2); | |
3103 } else { | |
3104 // Here d1 == d2. Due to edits of the dominator-tree, sections | |
3105 // of the tree might have the same depth. These sections have | |
3106 // to be searched more carefully. | |
3107 | |
3108 // Scan up all the n1's with equal depth, looking for n2. | |
3109 _dom_lca_tags.map(n1->_idx, tag); | |
3110 Node *t1 = idom(n1); | |
3111 while (dom_depth(t1) == d1) { | |
3112 if (t1 == n2) return n2; | |
3113 _dom_lca_tags.map(t1->_idx, tag); | |
3114 t1 = idom(t1); | |
3115 } | |
3116 // Scan up all the n2's with equal depth, looking for n1. | |
3117 _dom_lca_tags.map(n2->_idx, tag); | |
3118 Node *t2 = idom(n2); | |
3119 while (dom_depth(t2) == d2) { | |
3120 if (t2 == n1) return n1; | |
3121 _dom_lca_tags.map(t2->_idx, tag); | |
3122 t2 = idom(t2); | |
3123 } | |
3124 // Move up to a new dominator-depth value as well as up the dom-tree. | |
3125 n1 = t1; | |
3126 n2 = t2; | |
3127 d1 = dom_depth(n1); | |
3128 d2 = dom_depth(n2); | |
3129 } | |
3130 } while (n1 != n2); | |
3131 return n1; | |
3132 } | |
3133 | |
3134 //------------------------------init_dom_lca_tags------------------------------ | |
3135 // Tag could be a node's integer index, 32bits instead of 64bits in some cases | |
3136 // Intended use does not involve any growth for the array, so it could | |
3137 // be of fixed size. | |
3138 void PhaseIdealLoop::init_dom_lca_tags() { | |
3139 uint limit = C->unique() + 1; | |
3140 _dom_lca_tags.map( limit, NULL ); | |
3141 #ifdef ASSERT | |
3142 for( uint i = 0; i < limit; ++i ) { | |
3143 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer"); | |
3144 } | |
3145 #endif // ASSERT | |
3146 } | |
3147 | |
3148 //------------------------------clear_dom_lca_tags------------------------------ | |
3149 // Tag could be a node's integer index, 32bits instead of 64bits in some cases | |
3150 // Intended use does not involve any growth for the array, so it could | |
3151 // be of fixed size. | |
3152 void PhaseIdealLoop::clear_dom_lca_tags() { | |
3153 uint limit = C->unique() + 1; | |
3154 _dom_lca_tags.map( limit, NULL ); | |
3155 _dom_lca_tags.clear(); | |
3156 #ifdef ASSERT | |
3157 for( uint i = 0; i < limit; ++i ) { | |
3158 assert(_dom_lca_tags[i] == NULL, "Must be distinct from each node pointer"); | |
3159 } | |
3160 #endif // ASSERT | |
3161 } | |
3162 | |
3163 //------------------------------build_loop_late-------------------------------- | |
3164 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
3165 // Second pass finds latest legal placement, and ideal loop placement. | |
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3166 void PhaseIdealLoop::build_loop_late( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ) { |
0 | 3167 while (worklist.size() != 0) { |
3168 Node *n = worklist.pop(); | |
3169 // Only visit once | |
3170 if (visited.test_set(n->_idx)) continue; | |
3171 uint cnt = n->outcnt(); | |
3172 uint i = 0; | |
3173 while (true) { | |
3174 assert( _nodes[n->_idx], "no dead nodes" ); | |
3175 // Visit all children | |
3176 if (i < cnt) { | |
3177 Node* use = n->raw_out(i); | |
3178 ++i; | |
3179 // Check for dead uses. Aggressively prune such junk. It might be | |
3180 // dead in the global sense, but still have local uses so I cannot | |
3181 // easily call 'remove_dead_node'. | |
3182 if( _nodes[use->_idx] != NULL || use->is_top() ) { // Not dead? | |
3183 // Due to cycles, we might not hit the same fixed point in the verify | |
3184 // pass as we do in the regular pass. Instead, visit such phis as | |
3185 // simple uses of the loop head. | |
3186 if( use->in(0) && (use->is_CFG() || use->is_Phi()) ) { | |
3187 if( !visited.test(use->_idx) ) | |
3188 worklist.push(use); | |
3189 } else if( !visited.test_set(use->_idx) ) { | |
3190 nstack.push(n, i); // Save parent and next use's index. | |
3191 n = use; // Process all children of current use. | |
3192 cnt = use->outcnt(); | |
3193 i = 0; | |
3194 } | |
3195 } else { | |
3196 // Do not visit around the backedge of loops via data edges. | |
3197 // push dead code onto a worklist | |
3198 _deadlist.push(use); | |
3199 } | |
3200 } else { | |
3201 // All of n's children have been processed, complete post-processing. | |
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3202 build_loop_late_post(n); |
0 | 3203 if (nstack.is_empty()) { |
3204 // Finished all nodes on stack. | |
3205 // Process next node on the worklist. | |
3206 break; | |
3207 } | |
3208 // Get saved parent node and next use's index. Visit the rest of uses. | |
3209 n = nstack.node(); | |
3210 cnt = n->outcnt(); | |
3211 i = nstack.index(); | |
3212 nstack.pop(); | |
3213 } | |
3214 } | |
3215 } | |
3216 } | |
3217 | |
3218 //------------------------------build_loop_late_post--------------------------- | |
3219 // Put Data nodes into some loop nest, by setting the _nodes[]->loop mapping. | |
3220 // Second pass finds latest legal placement, and ideal loop placement. | |
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3221 void PhaseIdealLoop::build_loop_late_post( Node *n ) { |
0 | 3222 |
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3223 if (n->req() == 2 && n->Opcode() == Op_ConvI2L && !C->major_progress() && !_verify_only) { |
0 | 3224 _igvn._worklist.push(n); // Maybe we'll normalize it, if no more loops. |
3225 } | |
3226 | |
3227 // CFG and pinned nodes already handled | |
3228 if( n->in(0) ) { | |
3229 if( n->in(0)->is_top() ) return; // Dead? | |
3230 | |
3231 // We'd like +VerifyLoopOptimizations to not believe that Mod's/Loads | |
3232 // _must_ be pinned (they have to observe their control edge of course). | |
3233 // Unlike Stores (which modify an unallocable resource, the memory | |
3234 // state), Mods/Loads can float around. So free them up. | |
3235 bool pinned = true; | |
3236 switch( n->Opcode() ) { | |
3237 case Op_DivI: | |
3238 case Op_DivF: | |
3239 case Op_DivD: | |
3240 case Op_ModI: | |
3241 case Op_ModF: | |
3242 case Op_ModD: | |
3243 case Op_LoadB: // Same with Loads; they can sink | |
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3244 case Op_LoadUB: // during loop optimizations. |
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3245 case Op_LoadUS: |
0 | 3246 case Op_LoadD: |
3247 case Op_LoadF: | |
3248 case Op_LoadI: | |
3249 case Op_LoadKlass: | |
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3250 case Op_LoadNKlass: |
0 | 3251 case Op_LoadL: |
3252 case Op_LoadS: | |
3253 case Op_LoadP: | |
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3254 case Op_LoadN: |
0 | 3255 case Op_LoadRange: |
3256 case Op_LoadD_unaligned: | |
3257 case Op_LoadL_unaligned: | |
3258 case Op_StrComp: // Does a bunch of load-like effects | |
681 | 3259 case Op_StrEquals: |
3260 case Op_StrIndexOf: | |
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3261 case Op_AryEq: |
0 | 3262 pinned = false; |
3263 } | |
3264 if( pinned ) { | |
605 | 3265 IdealLoopTree *chosen_loop = get_loop(n->is_CFG() ? n : get_ctrl(n)); |
3266 if( !chosen_loop->_child ) // Inner loop? | |
3267 chosen_loop->_body.push(n); // Collect inner loops | |
0 | 3268 return; |
3269 } | |
3270 } else { // No slot zero | |
3271 if( n->is_CFG() ) { // CFG with no slot 0 is dead | |
3272 _nodes.map(n->_idx,0); // No block setting, it's globally dead | |
3273 return; | |
3274 } | |
3275 assert(!n->is_CFG() || n->outcnt() == 0, ""); | |
3276 } | |
3277 | |
3278 // Do I have a "safe range" I can select over? | |
3279 Node *early = get_ctrl(n);// Early location already computed | |
3280 | |
3281 // Compute latest point this Node can go | |
3282 Node *LCA = get_late_ctrl( n, early ); | |
3283 // LCA is NULL due to uses being dead | |
3284 if( LCA == NULL ) { | |
3285 #ifdef ASSERT | |
3286 for (DUIterator i1 = n->outs(); n->has_out(i1); i1++) { | |
3287 assert( _nodes[n->out(i1)->_idx] == NULL, "all uses must also be dead"); | |
3288 } | |
3289 #endif | |
3290 _nodes.map(n->_idx, 0); // This node is useless | |
3291 _deadlist.push(n); | |
3292 return; | |
3293 } | |
3294 assert(LCA != NULL && !LCA->is_top(), "no dead nodes"); | |
3295 | |
3296 Node *legal = LCA; // Walk 'legal' up the IDOM chain | |
3297 Node *least = legal; // Best legal position so far | |
3298 while( early != legal ) { // While not at earliest legal | |
1172 | 3299 #ifdef ASSERT |
3300 if (legal->is_Start() && !early->is_Root()) { | |
3301 // Bad graph. Print idom path and fail. | |
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3302 dump_bad_graph(n, early, LCA); |
1172 | 3303 assert(false, "Bad graph detected in build_loop_late"); |
3304 } | |
3305 #endif | |
0 | 3306 // Find least loop nesting depth |
3307 legal = idom(legal); // Bump up the IDOM tree | |
3308 // Check for lower nesting depth | |
3309 if( get_loop(legal)->_nest < get_loop(least)->_nest ) | |
3310 least = legal; | |
3311 } | |
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3312 assert(early == legal || legal != C->root(), "bad dominance of inputs"); |
0 | 3313 |
3314 // Try not to place code on a loop entry projection | |
3315 // which can inhibit range check elimination. | |
3316 if (least != early) { | |
3317 Node* ctrl_out = least->unique_ctrl_out(); | |
3318 if (ctrl_out && ctrl_out->is_CountedLoop() && | |
3319 least == ctrl_out->in(LoopNode::EntryControl)) { | |
3320 Node* least_dom = idom(least); | |
3321 if (get_loop(least_dom)->is_member(get_loop(least))) { | |
3322 least = least_dom; | |
3323 } | |
3324 } | |
3325 } | |
3326 | |
3327 #ifdef ASSERT | |
3328 // If verifying, verify that 'verify_me' has a legal location | |
3329 // and choose it as our location. | |
921
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3330 if( _verify_me ) { |
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3331 Node *v_ctrl = _verify_me->get_ctrl_no_update(n); |
0 | 3332 Node *legal = LCA; |
3333 while( early != legal ) { // While not at earliest legal | |
3334 if( legal == v_ctrl ) break; // Check for prior good location | |
3335 legal = idom(legal) ;// Bump up the IDOM tree | |
3336 } | |
3337 // Check for prior good location | |
3338 if( legal == v_ctrl ) least = legal; // Keep prior if found | |
3339 } | |
3340 #endif | |
3341 | |
3342 // Assign discovered "here or above" point | |
3343 least = find_non_split_ctrl(least); | |
3344 set_ctrl(n, least); | |
3345 | |
3346 // Collect inner loop bodies | |
605 | 3347 IdealLoopTree *chosen_loop = get_loop(least); |
3348 if( !chosen_loop->_child ) // Inner loop? | |
3349 chosen_loop->_body.push(n);// Collect inner loops | |
0 | 3350 } |
3351 | |
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3352 #ifdef ASSERT |
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3353 void PhaseIdealLoop::dump_bad_graph(Node* n, Node* early, Node* LCA) { |
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3354 tty->print_cr( "Bad graph detected in build_loop_late"); |
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3355 tty->print("n: "); n->dump(); |
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3356 tty->print("early(n): "); early->dump(); |
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3357 if (n->in(0) != NULL && !n->in(0)->is_top() && |
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3358 n->in(0) != early && !n->in(0)->is_Root()) { |
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3359 tty->print("n->in(0): "); n->in(0)->dump(); |
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3360 } |
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3361 for (uint i = 1; i < n->req(); i++) { |
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3362 Node* in1 = n->in(i); |
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3363 if (in1 != NULL && in1 != n && !in1->is_top()) { |
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3364 tty->print("n->in(%d): ", i); in1->dump(); |
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3365 Node* in1_early = get_ctrl(in1); |
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3366 tty->print("early(n->in(%d)): ", i); in1_early->dump(); |
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3367 if (in1->in(0) != NULL && !in1->in(0)->is_top() && |
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3368 in1->in(0) != in1_early && !in1->in(0)->is_Root()) { |
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3369 tty->print("n->in(%d)->in(0): ", i); in1->in(0)->dump(); |
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3370 } |
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3371 for (uint j = 1; j < in1->req(); j++) { |
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3372 Node* in2 = in1->in(j); |
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3373 if (in2 != NULL && in2 != n && in2 != in1 && !in2->is_top()) { |
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3374 tty->print("n->in(%d)->in(%d): ", i, j); in2->dump(); |
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3375 Node* in2_early = get_ctrl(in2); |
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3376 tty->print("early(n->in(%d)->in(%d)): ", i, j); in2_early->dump(); |
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3377 if (in2->in(0) != NULL && !in2->in(0)->is_top() && |
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3378 in2->in(0) != in2_early && !in2->in(0)->is_Root()) { |
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3379 tty->print("n->in(%d)->in(%d)->in(0): ", i, j); in2->in(0)->dump(); |
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3380 } |
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3381 } |
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3382 } |
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3383 } |
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3384 } |
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3385 tty->cr(); |
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3386 tty->print("LCA(n): "); LCA->dump(); |
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3387 for (uint i = 0; i < n->outcnt(); i++) { |
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3388 Node* u1 = n->raw_out(i); |
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3389 if (u1 == n) |
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3390 continue; |
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3391 tty->print("n->out(%d): ", i); u1->dump(); |
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3392 if (u1->is_CFG()) { |
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3393 for (uint j = 0; j < u1->outcnt(); j++) { |
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3394 Node* u2 = u1->raw_out(j); |
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3395 if (u2 != u1 && u2 != n && u2->is_CFG()) { |
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3396 tty->print("n->out(%d)->out(%d): ", i, j); u2->dump(); |
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3397 } |
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3398 } |
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3399 } else { |
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3400 Node* u1_later = get_ctrl(u1); |
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3401 tty->print("later(n->out(%d)): ", i); u1_later->dump(); |
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3402 if (u1->in(0) != NULL && !u1->in(0)->is_top() && |
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3403 u1->in(0) != u1_later && !u1->in(0)->is_Root()) { |
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3404 tty->print("n->out(%d)->in(0): ", i); u1->in(0)->dump(); |
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3405 } |
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3406 for (uint j = 0; j < u1->outcnt(); j++) { |
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3407 Node* u2 = u1->raw_out(j); |
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3408 if (u2 == n || u2 == u1) |
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3409 continue; |
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3410 tty->print("n->out(%d)->out(%d): ", i, j); u2->dump(); |
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3411 if (!u2->is_CFG()) { |
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3412 Node* u2_later = get_ctrl(u2); |
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3413 tty->print("later(n->out(%d)->out(%d)): ", i, j); u2_later->dump(); |
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3414 if (u2->in(0) != NULL && !u2->in(0)->is_top() && |
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3415 u2->in(0) != u2_later && !u2->in(0)->is_Root()) { |
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3416 tty->print("n->out(%d)->in(0): ", i); u2->in(0)->dump(); |
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3417 } |
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3418 } |
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3419 } |
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3420 } |
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3421 } |
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3422 tty->cr(); |
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3423 int ct = 0; |
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3424 Node *dbg_legal = LCA; |
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3425 while(!dbg_legal->is_Start() && ct < 100) { |
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3426 tty->print("idom[%d] ",ct); dbg_legal->dump(); |
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3427 ct++; |
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3428 dbg_legal = idom(dbg_legal); |
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3429 } |
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3430 tty->cr(); |
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3431 } |
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3432 #endif |
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3433 |
0 | 3434 #ifndef PRODUCT |
3435 //------------------------------dump------------------------------------------- | |
3436 void PhaseIdealLoop::dump( ) const { | |
3437 ResourceMark rm; | |
3438 Arena* arena = Thread::current()->resource_area(); | |
3439 Node_Stack stack(arena, C->unique() >> 2); | |
3440 Node_List rpo_list; | |
3441 VectorSet visited(arena); | |
3442 visited.set(C->top()->_idx); | |
3443 rpo( C->root(), stack, visited, rpo_list ); | |
3444 // Dump root loop indexed by last element in PO order | |
3445 dump( _ltree_root, rpo_list.size(), rpo_list ); | |
3446 } | |
3447 | |
3448 void PhaseIdealLoop::dump( IdealLoopTree *loop, uint idx, Node_List &rpo_list ) const { | |
367
194b8e3a2fc4
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3449 loop->dump_head(); |
0 | 3450 |
3451 // Now scan for CFG nodes in the same loop | |
3452 for( uint j=idx; j > 0; j-- ) { | |
3453 Node *n = rpo_list[j-1]; | |
3454 if( !_nodes[n->_idx] ) // Skip dead nodes | |
3455 continue; | |
3456 if( get_loop(n) != loop ) { // Wrong loop nest | |
3457 if( get_loop(n)->_head == n && // Found nested loop? | |
3458 get_loop(n)->_parent == loop ) | |
3459 dump(get_loop(n),rpo_list.size(),rpo_list); // Print it nested-ly | |
3460 continue; | |
3461 } | |
3462 | |
3463 // Dump controlling node | |
3464 for( uint x = 0; x < loop->_nest; x++ ) | |
3465 tty->print(" "); | |
3466 tty->print("C"); | |
3467 if( n == C->root() ) { | |
3468 n->dump(); | |
3469 } else { | |
3470 Node* cached_idom = idom_no_update(n); | |
3471 Node *computed_idom = n->in(0); | |
3472 if( n->is_Region() ) { | |
3473 computed_idom = compute_idom(n); | |
3474 // computed_idom() will return n->in(0) when idom(n) is an IfNode (or | |
3475 // any MultiBranch ctrl node), so apply a similar transform to | |
3476 // the cached idom returned from idom_no_update. | |
3477 cached_idom = find_non_split_ctrl(cached_idom); | |
3478 } | |
3479 tty->print(" ID:%d",computed_idom->_idx); | |
3480 n->dump(); | |
3481 if( cached_idom != computed_idom ) { | |
3482 tty->print_cr("*** BROKEN IDOM! Computed as: %d, cached as: %d", | |
3483 computed_idom->_idx, cached_idom->_idx); | |
3484 } | |
3485 } | |
3486 // Dump nodes it controls | |
3487 for( uint k = 0; k < _nodes.Size(); k++ ) { | |
3488 // (k < C->unique() && get_ctrl(find(k)) == n) | |
3489 if (k < C->unique() && _nodes[k] == (Node*)((intptr_t)n + 1)) { | |
3490 Node *m = C->root()->find(k); | |
3491 if( m && m->outcnt() > 0 ) { | |
3492 if (!(has_ctrl(m) && get_ctrl_no_update(m) == n)) { | |
3493 tty->print_cr("*** BROKEN CTRL ACCESSOR! _nodes[k] is %p, ctrl is %p", | |
3494 _nodes[k], has_ctrl(m) ? get_ctrl_no_update(m) : NULL); | |
3495 } | |
3496 for( uint j = 0; j < loop->_nest; j++ ) | |
3497 tty->print(" "); | |
3498 tty->print(" "); | |
3499 m->dump(); | |
3500 } | |
3501 } | |
3502 } | |
3503 } | |
3504 } | |
3505 | |
3506 // Collect a R-P-O for the whole CFG. | |
3507 // Result list is in post-order (scan backwards for RPO) | |
3508 void PhaseIdealLoop::rpo( Node *start, Node_Stack &stk, VectorSet &visited, Node_List &rpo_list ) const { | |
3509 stk.push(start, 0); | |
3510 visited.set(start->_idx); | |
3511 | |
3512 while (stk.is_nonempty()) { | |
3513 Node* m = stk.node(); | |
3514 uint idx = stk.index(); | |
3515 if (idx < m->outcnt()) { | |
3516 stk.set_index(idx + 1); | |
3517 Node* n = m->raw_out(idx); | |
3518 if (n->is_CFG() && !visited.test_set(n->_idx)) { | |
3519 stk.push(n, 0); | |
3520 } | |
3521 } else { | |
3522 rpo_list.push(m); | |
3523 stk.pop(); | |
3524 } | |
3525 } | |
3526 } | |
3527 #endif | |
3528 | |
3529 | |
3530 //============================================================================= | |
3531 //------------------------------LoopTreeIterator----------------------------------- | |
3532 | |
3533 // Advance to next loop tree using a preorder, left-to-right traversal. | |
3534 void LoopTreeIterator::next() { | |
3535 assert(!done(), "must not be done."); | |
3536 if (_curnt->_child != NULL) { | |
3537 _curnt = _curnt->_child; | |
3538 } else if (_curnt->_next != NULL) { | |
3539 _curnt = _curnt->_next; | |
3540 } else { | |
3541 while (_curnt != _root && _curnt->_next == NULL) { | |
3542 _curnt = _curnt->_parent; | |
3543 } | |
3544 if (_curnt == _root) { | |
3545 _curnt = NULL; | |
3546 assert(done(), "must be done."); | |
3547 } else { | |
3548 assert(_curnt->_next != NULL, "must be more to do"); | |
3549 _curnt = _curnt->_next; | |
3550 } | |
3551 } | |
3552 } |