Mercurial > hg > truffle
annotate src/share/vm/opto/loopPredicate.cpp @ 12956:3213ba4d3dff
8024069: replace_in_map() should operate on parent maps
Summary: type information gets lost because replace_in_map() doesn't update parent maps
Reviewed-by: kvn, twisti
| author | roland |
|---|---|
| date | Sat, 19 Oct 2013 12:16:43 +0200 |
| parents | 6f3fd5150b67 |
| children | de6a9e811145 |
| rev | line source |
|---|---|
| 2445 | 1 /* |
|
6842
b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
mikael
parents:
6804
diff
changeset
|
2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| 2445 | 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "opto/loopnode.hpp" | |
| 27 #include "opto/addnode.hpp" | |
| 28 #include "opto/callnode.hpp" | |
| 29 #include "opto/connode.hpp" | |
| 30 #include "opto/loopnode.hpp" | |
| 31 #include "opto/mulnode.hpp" | |
| 32 #include "opto/rootnode.hpp" | |
| 33 #include "opto/subnode.hpp" | |
| 34 | |
| 35 /* | |
| 36 * The general idea of Loop Predication is to insert a predicate on the entry | |
| 37 * path to a loop, and raise a uncommon trap if the check of the condition fails. | |
| 38 * The condition checks are promoted from inside the loop body, and thus | |
| 39 * the checks inside the loop could be eliminated. Currently, loop predication | |
| 40 * optimization has been applied to remove array range check and loop invariant | |
| 41 * checks (such as null checks). | |
| 42 */ | |
| 43 | |
| 44 //-------------------------------register_control------------------------- | |
| 45 void PhaseIdealLoop::register_control(Node* n, IdealLoopTree *loop, Node* pred) { | |
| 46 assert(n->is_CFG(), "must be control node"); | |
| 47 _igvn.register_new_node_with_optimizer(n); | |
| 48 loop->_body.push(n); | |
| 49 set_loop(n, loop); | |
| 50 // When called from beautify_loops() idom is not constructed yet. | |
| 51 if (_idom != NULL) { | |
| 52 set_idom(n, pred, dom_depth(pred)); | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 //------------------------------create_new_if_for_predicate------------------------ | |
| 57 // create a new if above the uct_if_pattern for the predicate to be promoted. | |
| 58 // | |
| 59 // before after | |
| 60 // ---------- ---------- | |
| 61 // ctrl ctrl | |
| 62 // | | | |
| 63 // | | | |
| 64 // v v | |
| 65 // iff new_iff | |
| 66 // / \ / \ | |
| 67 // / \ / \ | |
| 68 // v v v v | |
| 69 // uncommon_proj cont_proj if_uct if_cont | |
| 70 // \ | | | | | |
| 71 // \ | | | | | |
| 72 // v v v | v | |
| 73 // rgn loop | iff | |
| 74 // | | / \ | |
| 75 // | | / \ | |
| 76 // v | v v | |
| 77 // uncommon_trap | uncommon_proj cont_proj | |
| 78 // \ \ | | | |
| 79 // \ \ | | | |
| 80 // v v v v | |
| 81 // rgn loop | |
| 82 // | | |
| 83 // | | |
| 84 // v | |
| 85 // uncommon_trap | |
| 86 // | |
| 87 // | |
| 88 // We will create a region to guard the uct call if there is no one there. | |
| 89 // The true projecttion (if_cont) of the new_iff is returned. | |
| 90 // This code is also used to clone predicates to clonned loops. | |
| 91 ProjNode* PhaseIdealLoop::create_new_if_for_predicate(ProjNode* cont_proj, Node* new_entry, | |
| 92 Deoptimization::DeoptReason reason) { | |
|
12956
3213ba4d3dff
8024069: replace_in_map() should operate on parent maps
roland
parents:
10278
diff
changeset
|
93 assert(cont_proj->is_uncommon_trap_if_pattern(reason), "must be a uct if pattern!"); |
| 2445 | 94 IfNode* iff = cont_proj->in(0)->as_If(); |
| 95 | |
| 96 ProjNode *uncommon_proj = iff->proj_out(1 - cont_proj->_con); | |
| 97 Node *rgn = uncommon_proj->unique_ctrl_out(); | |
| 98 assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct"); | |
| 99 | |
| 100 uint proj_index = 1; // region's edge corresponding to uncommon_proj | |
| 101 if (!rgn->is_Region()) { // create a region to guard the call | |
| 102 assert(rgn->is_Call(), "must be call uct"); | |
| 103 CallNode* call = rgn->as_Call(); | |
| 104 IdealLoopTree* loop = get_loop(call); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
105 rgn = new (C) RegionNode(1); |
| 2445 | 106 rgn->add_req(uncommon_proj); |
| 107 register_control(rgn, loop, uncommon_proj); | |
| 108 _igvn.hash_delete(call); | |
| 109 call->set_req(0, rgn); | |
| 110 // When called from beautify_loops() idom is not constructed yet. | |
| 111 if (_idom != NULL) { | |
| 112 set_idom(call, rgn, dom_depth(rgn)); | |
| 113 } | |
| 114 } else { | |
| 115 // Find region's edge corresponding to uncommon_proj | |
| 116 for (; proj_index < rgn->req(); proj_index++) | |
| 117 if (rgn->in(proj_index) == uncommon_proj) break; | |
| 118 assert(proj_index < rgn->req(), "sanity"); | |
| 119 } | |
| 120 | |
| 121 Node* entry = iff->in(0); | |
| 122 if (new_entry != NULL) { | |
| 123 // Clonning the predicate to new location. | |
| 124 entry = new_entry; | |
| 125 } | |
| 126 // Create new_iff | |
| 127 IdealLoopTree* lp = get_loop(entry); | |
| 128 IfNode *new_iff = iff->clone()->as_If(); | |
| 129 new_iff->set_req(0, entry); | |
| 130 register_control(new_iff, lp, entry); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
131 Node *if_cont = new (C) IfTrueNode(new_iff); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
132 Node *if_uct = new (C) IfFalseNode(new_iff); |
| 2445 | 133 if (cont_proj->is_IfFalse()) { |
| 134 // Swap | |
| 135 Node* tmp = if_uct; if_uct = if_cont; if_cont = tmp; | |
| 136 } | |
| 137 register_control(if_cont, lp, new_iff); | |
| 138 register_control(if_uct, get_loop(rgn), new_iff); | |
| 139 | |
| 140 // if_uct to rgn | |
| 141 _igvn.hash_delete(rgn); | |
| 142 rgn->add_req(if_uct); | |
| 143 // When called from beautify_loops() idom is not constructed yet. | |
| 144 if (_idom != NULL) { | |
| 145 Node* ridom = idom(rgn); | |
| 146 Node* nrdom = dom_lca(ridom, new_iff); | |
| 147 set_idom(rgn, nrdom, dom_depth(rgn)); | |
| 148 } | |
| 149 | |
| 150 // If rgn has phis add new edges which has the same | |
| 151 // value as on original uncommon_proj pass. | |
| 152 assert(rgn->in(rgn->req() -1) == if_uct, "new edge should be last"); | |
| 153 bool has_phi = false; | |
| 154 for (DUIterator_Fast imax, i = rgn->fast_outs(imax); i < imax; i++) { | |
| 155 Node* use = rgn->fast_out(i); | |
| 156 if (use->is_Phi() && use->outcnt() > 0) { | |
| 157 assert(use->in(0) == rgn, ""); | |
|
6144
5e990493719e
7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node*, int, Node*) where applicable
kvn
parents:
3850
diff
changeset
|
158 _igvn.rehash_node_delayed(use); |
| 2445 | 159 use->add_req(use->in(proj_index)); |
| 160 has_phi = true; | |
| 161 } | |
| 162 } | |
| 163 assert(!has_phi || rgn->req() > 3, "no phis when region is created"); | |
| 164 | |
| 165 if (new_entry == NULL) { | |
| 166 // Attach if_cont to iff | |
| 167 _igvn.hash_delete(iff); | |
| 168 iff->set_req(0, if_cont); | |
| 169 if (_idom != NULL) { | |
| 170 set_idom(iff, if_cont, dom_depth(iff)); | |
| 171 } | |
| 172 } | |
| 173 return if_cont->as_Proj(); | |
| 174 } | |
| 175 | |
| 176 //------------------------------create_new_if_for_predicate------------------------ | |
| 177 // Create a new if below new_entry for the predicate to be cloned (IGVN optimization) | |
| 178 ProjNode* PhaseIterGVN::create_new_if_for_predicate(ProjNode* cont_proj, Node* new_entry, | |
| 179 Deoptimization::DeoptReason reason) { | |
| 180 assert(new_entry != 0, "only used for clone predicate"); | |
|
12956
3213ba4d3dff
8024069: replace_in_map() should operate on parent maps
roland
parents:
10278
diff
changeset
|
181 assert(cont_proj->is_uncommon_trap_if_pattern(reason), "must be a uct if pattern!"); |
| 2445 | 182 IfNode* iff = cont_proj->in(0)->as_If(); |
| 183 | |
| 184 ProjNode *uncommon_proj = iff->proj_out(1 - cont_proj->_con); | |
| 185 Node *rgn = uncommon_proj->unique_ctrl_out(); | |
| 186 assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct"); | |
| 187 | |
| 188 uint proj_index = 1; // region's edge corresponding to uncommon_proj | |
| 189 if (!rgn->is_Region()) { // create a region to guard the call | |
| 190 assert(rgn->is_Call(), "must be call uct"); | |
| 191 CallNode* call = rgn->as_Call(); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
192 rgn = new (C) RegionNode(1); |
| 2445 | 193 register_new_node_with_optimizer(rgn); |
| 194 rgn->add_req(uncommon_proj); | |
| 195 hash_delete(call); | |
| 196 call->set_req(0, rgn); | |
| 197 } else { | |
| 198 // Find region's edge corresponding to uncommon_proj | |
| 199 for (; proj_index < rgn->req(); proj_index++) | |
| 200 if (rgn->in(proj_index) == uncommon_proj) break; | |
| 201 assert(proj_index < rgn->req(), "sanity"); | |
| 202 } | |
| 203 | |
| 204 // Create new_iff in new location. | |
| 205 IfNode *new_iff = iff->clone()->as_If(); | |
| 206 new_iff->set_req(0, new_entry); | |
| 207 | |
| 208 register_new_node_with_optimizer(new_iff); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
209 Node *if_cont = new (C) IfTrueNode(new_iff); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
210 Node *if_uct = new (C) IfFalseNode(new_iff); |
| 2445 | 211 if (cont_proj->is_IfFalse()) { |
| 212 // Swap | |
| 213 Node* tmp = if_uct; if_uct = if_cont; if_cont = tmp; | |
| 214 } | |
| 215 register_new_node_with_optimizer(if_cont); | |
| 216 register_new_node_with_optimizer(if_uct); | |
| 217 | |
| 218 // if_uct to rgn | |
| 219 hash_delete(rgn); | |
| 220 rgn->add_req(if_uct); | |
| 221 | |
| 222 // If rgn has phis add corresponding new edges which has the same | |
| 223 // value as on original uncommon_proj pass. | |
| 224 assert(rgn->in(rgn->req() -1) == if_uct, "new edge should be last"); | |
| 225 bool has_phi = false; | |
| 226 for (DUIterator_Fast imax, i = rgn->fast_outs(imax); i < imax; i++) { | |
| 227 Node* use = rgn->fast_out(i); | |
| 228 if (use->is_Phi() && use->outcnt() > 0) { | |
|
6144
5e990493719e
7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node*, int, Node*) where applicable
kvn
parents:
3850
diff
changeset
|
229 rehash_node_delayed(use); |
| 2445 | 230 use->add_req(use->in(proj_index)); |
| 231 has_phi = true; | |
| 232 } | |
| 233 } | |
| 234 assert(!has_phi || rgn->req() > 3, "no phis when region is created"); | |
| 235 | |
| 236 return if_cont->as_Proj(); | |
| 237 } | |
| 238 | |
| 239 //--------------------------clone_predicate----------------------- | |
| 240 ProjNode* PhaseIdealLoop::clone_predicate(ProjNode* predicate_proj, Node* new_entry, | |
| 241 Deoptimization::DeoptReason reason, | |
| 242 PhaseIdealLoop* loop_phase, | |
| 243 PhaseIterGVN* igvn) { | |
| 244 ProjNode* new_predicate_proj; | |
| 245 if (loop_phase != NULL) { | |
| 246 new_predicate_proj = loop_phase->create_new_if_for_predicate(predicate_proj, new_entry, reason); | |
| 247 } else { | |
| 248 new_predicate_proj = igvn->create_new_if_for_predicate(predicate_proj, new_entry, reason); | |
| 249 } | |
| 250 IfNode* iff = new_predicate_proj->in(0)->as_If(); | |
| 251 Node* ctrl = iff->in(0); | |
| 252 | |
| 253 // Match original condition since predicate's projections could be swapped. | |
| 254 assert(predicate_proj->in(0)->in(1)->in(1)->Opcode()==Op_Opaque1, "must be"); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
255 Node* opq = new (igvn->C) Opaque1Node(igvn->C, predicate_proj->in(0)->in(1)->in(1)->in(1)); |
| 2445 | 256 igvn->C->add_predicate_opaq(opq); |
| 257 | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
258 Node* bol = new (igvn->C) Conv2BNode(opq); |
| 2445 | 259 if (loop_phase != NULL) { |
| 260 loop_phase->register_new_node(opq, ctrl); | |
| 261 loop_phase->register_new_node(bol, ctrl); | |
| 262 } else { | |
| 263 igvn->register_new_node_with_optimizer(opq); | |
| 264 igvn->register_new_node_with_optimizer(bol); | |
| 265 } | |
| 266 igvn->hash_delete(iff); | |
| 267 iff->set_req(1, bol); | |
| 268 return new_predicate_proj; | |
| 269 } | |
| 270 | |
| 271 | |
| 272 //--------------------------clone_loop_predicates----------------------- | |
| 273 // Interface from IGVN | |
| 3345 | 274 Node* PhaseIterGVN::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) { |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
275 return PhaseIdealLoop::clone_loop_predicates(old_entry, new_entry, clone_limit_check, NULL, this); |
| 2445 | 276 } |
| 277 | |
| 278 // Interface from PhaseIdealLoop | |
| 3345 | 279 Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) { |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
280 return clone_loop_predicates(old_entry, new_entry, clone_limit_check, this, &this->_igvn); |
| 2445 | 281 } |
| 282 | |
| 283 // Clone loop predicates to cloned loops (peeled, unswitched, split_if). | |
| 284 Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry, | |
| 3345 | 285 bool clone_limit_check, |
| 2445 | 286 PhaseIdealLoop* loop_phase, |
| 287 PhaseIterGVN* igvn) { | |
| 288 #ifdef ASSERT | |
| 289 if (new_entry == NULL || !(new_entry->is_Proj() || new_entry->is_Region() || new_entry->is_SafePoint())) { | |
| 290 if (new_entry != NULL) | |
| 291 new_entry->dump(); | |
| 292 assert(false, "not IfTrue, IfFalse, Region or SafePoint"); | |
| 293 } | |
| 294 #endif | |
| 295 // Search original predicates | |
| 296 Node* entry = old_entry; | |
| 3345 | 297 ProjNode* limit_check_proj = NULL; |
| 298 if (LoopLimitCheck) { | |
| 299 limit_check_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
| 300 if (limit_check_proj != NULL) { | |
| 301 entry = entry->in(0)->in(0); | |
| 302 } | |
| 303 } | |
| 2445 | 304 if (UseLoopPredicate) { |
| 305 ProjNode* predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); | |
| 306 if (predicate_proj != NULL) { // right pattern that can be used by loop predication | |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
307 // clone predicate |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
308 new_entry = clone_predicate(predicate_proj, new_entry, |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
309 Deoptimization::Reason_predicate, |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
310 loop_phase, igvn); |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
311 assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone predicate"); |
| 2445 | 312 if (TraceLoopPredicate) { |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
313 tty->print("Loop Predicate cloned: "); |
| 2445 | 314 debug_only( new_entry->in(0)->dump(); ) |
| 315 } | |
| 316 } | |
| 317 } | |
| 3345 | 318 if (limit_check_proj != NULL && clone_limit_check) { |
| 319 // Clone loop limit check last to insert it before loop. | |
| 320 // Don't clone a limit check which was already finalized | |
| 321 // for this counted loop (only one limit check is needed). | |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
322 new_entry = clone_predicate(limit_check_proj, new_entry, |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
323 Deoptimization::Reason_loop_limit_check, |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
324 loop_phase, igvn); |
|
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
325 assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone limit check"); |
| 3345 | 326 if (TraceLoopLimitCheck) { |
|
3845
c96c3eb1efae
7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents:
3840
diff
changeset
|
327 tty->print("Loop Limit Check cloned: "); |
| 3345 | 328 debug_only( new_entry->in(0)->dump(); ) |
| 329 } | |
| 330 } | |
| 2445 | 331 return new_entry; |
| 332 } | |
| 333 | |
| 334 //--------------------------skip_loop_predicates------------------------------ | |
| 335 // Skip related predicates. | |
| 336 Node* PhaseIdealLoop::skip_loop_predicates(Node* entry) { | |
| 337 Node* predicate = NULL; | |
| 3345 | 338 if (LoopLimitCheck) { |
| 339 predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
| 340 if (predicate != NULL) { | |
| 341 entry = entry->in(0)->in(0); | |
| 342 } | |
| 343 } | |
| 2445 | 344 if (UseLoopPredicate) { |
| 345 predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); | |
| 346 if (predicate != NULL) { // right pattern that can be used by loop predication | |
| 347 IfNode* iff = entry->in(0)->as_If(); | |
| 348 ProjNode* uncommon_proj = iff->proj_out(1 - entry->as_Proj()->_con); | |
| 349 Node* rgn = uncommon_proj->unique_ctrl_out(); | |
| 350 assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct"); | |
| 351 entry = entry->in(0)->in(0); | |
| 352 while (entry != NULL && entry->is_Proj() && entry->in(0)->is_If()) { | |
| 353 uncommon_proj = entry->in(0)->as_If()->proj_out(1 - entry->as_Proj()->_con); | |
| 354 if (uncommon_proj->unique_ctrl_out() != rgn) | |
| 355 break; | |
| 356 entry = entry->in(0)->in(0); | |
| 357 } | |
| 358 } | |
| 359 } | |
| 360 return entry; | |
| 361 } | |
| 362 | |
| 363 //--------------------------find_predicate_insertion_point------------------- | |
| 364 // Find a good location to insert a predicate | |
| 365 ProjNode* PhaseIdealLoop::find_predicate_insertion_point(Node* start_c, Deoptimization::DeoptReason reason) { | |
| 366 if (start_c == NULL || !start_c->is_Proj()) | |
| 367 return NULL; | |
|
12956
3213ba4d3dff
8024069: replace_in_map() should operate on parent maps
roland
parents:
10278
diff
changeset
|
368 if (start_c->as_Proj()->is_uncommon_trap_if_pattern(reason)) { |
| 2445 | 369 return start_c->as_Proj(); |
| 370 } | |
| 371 return NULL; | |
| 372 } | |
| 373 | |
| 374 //--------------------------find_predicate------------------------------------ | |
| 375 // Find a predicate | |
| 376 Node* PhaseIdealLoop::find_predicate(Node* entry) { | |
| 377 Node* predicate = NULL; | |
| 3345 | 378 if (LoopLimitCheck) { |
| 379 predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
| 380 if (predicate != NULL) { // right pattern that can be used by loop predication | |
| 381 return entry; | |
| 382 } | |
| 383 } | |
| 2445 | 384 if (UseLoopPredicate) { |
| 385 predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); | |
| 386 if (predicate != NULL) { // right pattern that can be used by loop predication | |
| 387 return entry; | |
| 388 } | |
| 389 } | |
| 390 return NULL; | |
| 391 } | |
| 392 | |
| 393 //------------------------------Invariance----------------------------------- | |
| 394 // Helper class for loop_predication_impl to compute invariance on the fly and | |
| 395 // clone invariants. | |
| 396 class Invariance : public StackObj { | |
| 397 VectorSet _visited, _invariant; | |
| 398 Node_Stack _stack; | |
| 399 VectorSet _clone_visited; | |
| 400 Node_List _old_new; // map of old to new (clone) | |
| 401 IdealLoopTree* _lpt; | |
| 402 PhaseIdealLoop* _phase; | |
| 403 | |
| 404 // Helper function to set up the invariance for invariance computation | |
| 405 // If n is a known invariant, set up directly. Otherwise, look up the | |
| 406 // the possibility to push n onto the stack for further processing. | |
| 407 void visit(Node* use, Node* n) { | |
| 408 if (_lpt->is_invariant(n)) { // known invariant | |
| 409 _invariant.set(n->_idx); | |
| 410 } else if (!n->is_CFG()) { | |
| 411 Node *n_ctrl = _phase->ctrl_or_self(n); | |
| 412 Node *u_ctrl = _phase->ctrl_or_self(use); // self if use is a CFG | |
| 413 if (_phase->is_dominator(n_ctrl, u_ctrl)) { | |
| 414 _stack.push(n, n->in(0) == NULL ? 1 : 0); | |
| 415 } | |
| 416 } | |
| 417 } | |
| 418 | |
| 419 // Compute invariance for "the_node" and (possibly) all its inputs recursively | |
| 420 // on the fly | |
| 421 void compute_invariance(Node* n) { | |
| 422 assert(_visited.test(n->_idx), "must be"); | |
| 423 visit(n, n); | |
| 424 while (_stack.is_nonempty()) { | |
| 425 Node* n = _stack.node(); | |
| 426 uint idx = _stack.index(); | |
| 427 if (idx == n->req()) { // all inputs are processed | |
| 428 _stack.pop(); | |
| 429 // n is invariant if it's inputs are all invariant | |
| 430 bool all_inputs_invariant = true; | |
| 431 for (uint i = 0; i < n->req(); i++) { | |
| 432 Node* in = n->in(i); | |
| 433 if (in == NULL) continue; | |
| 434 assert(_visited.test(in->_idx), "must have visited input"); | |
| 435 if (!_invariant.test(in->_idx)) { // bad guy | |
| 436 all_inputs_invariant = false; | |
| 437 break; | |
| 438 } | |
| 439 } | |
| 440 if (all_inputs_invariant) { | |
| 441 _invariant.set(n->_idx); // I am a invariant too | |
| 442 } | |
| 443 } else { // process next input | |
| 444 _stack.set_index(idx + 1); | |
| 445 Node* m = n->in(idx); | |
| 446 if (m != NULL && !_visited.test_set(m->_idx)) { | |
| 447 visit(n, m); | |
| 448 } | |
| 449 } | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 // Helper function to set up _old_new map for clone_nodes. | |
| 454 // If n is a known invariant, set up directly ("clone" of n == n). | |
| 455 // Otherwise, push n onto the stack for real cloning. | |
| 456 void clone_visit(Node* n) { | |
| 457 assert(_invariant.test(n->_idx), "must be invariant"); | |
| 458 if (_lpt->is_invariant(n)) { // known invariant | |
| 459 _old_new.map(n->_idx, n); | |
| 460 } else { // to be cloned | |
| 461 assert(!n->is_CFG(), "should not see CFG here"); | |
| 462 _stack.push(n, n->in(0) == NULL ? 1 : 0); | |
| 463 } | |
| 464 } | |
| 465 | |
| 466 // Clone "n" and (possibly) all its inputs recursively | |
| 467 void clone_nodes(Node* n, Node* ctrl) { | |
| 468 clone_visit(n); | |
| 469 while (_stack.is_nonempty()) { | |
| 470 Node* n = _stack.node(); | |
| 471 uint idx = _stack.index(); | |
| 472 if (idx == n->req()) { // all inputs processed, clone n! | |
| 473 _stack.pop(); | |
| 474 // clone invariant node | |
| 475 Node* n_cl = n->clone(); | |
| 476 _old_new.map(n->_idx, n_cl); | |
| 477 _phase->register_new_node(n_cl, ctrl); | |
| 478 for (uint i = 0; i < n->req(); i++) { | |
| 479 Node* in = n_cl->in(i); | |
| 480 if (in == NULL) continue; | |
| 481 n_cl->set_req(i, _old_new[in->_idx]); | |
| 482 } | |
| 483 } else { // process next input | |
| 484 _stack.set_index(idx + 1); | |
| 485 Node* m = n->in(idx); | |
| 486 if (m != NULL && !_clone_visited.test_set(m->_idx)) { | |
| 487 clone_visit(m); // visit the input | |
| 488 } | |
| 489 } | |
| 490 } | |
| 491 } | |
| 492 | |
| 493 public: | |
| 494 Invariance(Arena* area, IdealLoopTree* lpt) : | |
| 495 _lpt(lpt), _phase(lpt->_phase), | |
| 496 _visited(area), _invariant(area), _stack(area, 10 /* guess */), | |
| 497 _clone_visited(area), _old_new(area) | |
| 498 {} | |
| 499 | |
| 500 // Map old to n for invariance computation and clone | |
| 501 void map_ctrl(Node* old, Node* n) { | |
| 502 assert(old->is_CFG() && n->is_CFG(), "must be"); | |
| 503 _old_new.map(old->_idx, n); // "clone" of old is n | |
| 504 _invariant.set(old->_idx); // old is invariant | |
| 505 _clone_visited.set(old->_idx); | |
| 506 } | |
| 507 | |
| 508 // Driver function to compute invariance | |
| 509 bool is_invariant(Node* n) { | |
| 510 if (!_visited.test_set(n->_idx)) | |
| 511 compute_invariance(n); | |
| 512 return (_invariant.test(n->_idx) != 0); | |
| 513 } | |
| 514 | |
| 515 // Driver function to clone invariant | |
| 516 Node* clone(Node* n, Node* ctrl) { | |
| 517 assert(ctrl->is_CFG(), "must be"); | |
| 518 assert(_invariant.test(n->_idx), "must be an invariant"); | |
| 519 if (!_clone_visited.test(n->_idx)) | |
| 520 clone_nodes(n, ctrl); | |
| 521 return _old_new[n->_idx]; | |
| 522 } | |
| 523 }; | |
| 524 | |
| 525 //------------------------------is_range_check_if ----------------------------------- | |
| 526 // Returns true if the predicate of iff is in "scale*iv + offset u< load_range(ptr)" format | |
| 527 // Note: this function is particularly designed for loop predication. We require load_range | |
| 528 // and offset to be loop invariant computed on the fly by "invar" | |
| 529 bool IdealLoopTree::is_range_check_if(IfNode *iff, PhaseIdealLoop *phase, Invariance& invar) const { | |
| 530 if (!is_loop_exit(iff)) { | |
| 531 return false; | |
| 532 } | |
| 533 if (!iff->in(1)->is_Bool()) { | |
| 534 return false; | |
| 535 } | |
| 536 const BoolNode *bol = iff->in(1)->as_Bool(); | |
| 537 if (bol->_test._test != BoolTest::lt) { | |
| 538 return false; | |
| 539 } | |
| 540 if (!bol->in(1)->is_Cmp()) { | |
| 541 return false; | |
| 542 } | |
| 543 const CmpNode *cmp = bol->in(1)->as_Cmp(); | |
| 544 if (cmp->Opcode() != Op_CmpU) { | |
| 545 return false; | |
| 546 } | |
| 547 Node* range = cmp->in(2); | |
| 548 if (range->Opcode() != Op_LoadRange) { | |
| 549 const TypeInt* tint = phase->_igvn.type(range)->isa_int(); | |
| 3345 | 550 if (tint == NULL || tint->empty() || tint->_lo < 0) { |
| 2445 | 551 // Allow predication on positive values that aren't LoadRanges. |
| 552 // This allows optimization of loops where the length of the | |
| 553 // array is a known value and doesn't need to be loaded back | |
| 554 // from the array. | |
| 555 return false; | |
| 556 } | |
| 557 } | |
| 558 if (!invar.is_invariant(range)) { | |
| 559 return false; | |
| 560 } | |
| 561 Node *iv = _head->as_CountedLoop()->phi(); | |
| 562 int scale = 0; | |
| 563 Node *offset = NULL; | |
| 564 if (!phase->is_scaled_iv_plus_offset(cmp->in(1), iv, &scale, &offset)) { | |
| 565 return false; | |
| 566 } | |
| 567 if (offset && !invar.is_invariant(offset)) { // offset must be invariant | |
| 568 return false; | |
| 569 } | |
| 570 return true; | |
| 571 } | |
| 572 | |
| 573 //------------------------------rc_predicate----------------------------------- | |
| 574 // Create a range check predicate | |
| 575 // | |
| 576 // for (i = init; i < limit; i += stride) { | |
| 577 // a[scale*i+offset] | |
| 578 // } | |
| 579 // | |
| 580 // Compute max(scale*i + offset) for init <= i < limit and build the predicate | |
| 581 // as "max(scale*i + offset) u< a.length". | |
| 582 // | |
| 583 // There are two cases for max(scale*i + offset): | |
| 584 // (1) stride*scale > 0 | |
| 585 // max(scale*i + offset) = scale*(limit-stride) + offset | |
| 586 // (2) stride*scale < 0 | |
| 587 // max(scale*i + offset) = scale*init + offset | |
| 3345 | 588 BoolNode* PhaseIdealLoop::rc_predicate(IdealLoopTree *loop, Node* ctrl, |
| 2445 | 589 int scale, Node* offset, |
| 590 Node* init, Node* limit, Node* stride, | |
| 591 Node* range, bool upper) { | |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
592 stringStream* predString = NULL; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
593 if (TraceLoopPredicate) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
594 predString = new stringStream(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
595 predString->print("rc_predicate "); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
596 } |
| 2445 | 597 |
| 598 Node* max_idx_expr = init; | |
| 599 int stride_con = stride->get_int(); | |
| 600 if ((stride_con > 0) == (scale > 0) == upper) { | |
| 3345 | 601 if (LoopLimitCheck) { |
| 602 // With LoopLimitCheck limit is not exact. | |
| 603 // Calculate exact limit here. | |
| 604 // Note, counted loop's test is '<' or '>'. | |
| 605 limit = exact_limit(loop); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
606 max_idx_expr = new (C) SubINode(limit, stride); |
| 3345 | 607 register_new_node(max_idx_expr, ctrl); |
| 608 if (TraceLoopPredicate) predString->print("(limit - stride) "); | |
| 609 } else { | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
610 max_idx_expr = new (C) SubINode(limit, stride); |
| 3345 | 611 register_new_node(max_idx_expr, ctrl); |
| 612 if (TraceLoopPredicate) predString->print("(limit - stride) "); | |
| 613 } | |
| 2445 | 614 } else { |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
615 if (TraceLoopPredicate) predString->print("init "); |
| 2445 | 616 } |
| 617 | |
| 618 if (scale != 1) { | |
| 619 ConNode* con_scale = _igvn.intcon(scale); | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
620 max_idx_expr = new (C) MulINode(max_idx_expr, con_scale); |
| 2445 | 621 register_new_node(max_idx_expr, ctrl); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
622 if (TraceLoopPredicate) predString->print("* %d ", scale); |
| 2445 | 623 } |
| 624 | |
| 625 if (offset && (!offset->is_Con() || offset->get_int() != 0)){ | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
626 max_idx_expr = new (C) AddINode(max_idx_expr, offset); |
| 2445 | 627 register_new_node(max_idx_expr, ctrl); |
| 628 if (TraceLoopPredicate) | |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
629 if (offset->is_Con()) predString->print("+ %d ", offset->get_int()); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
630 else predString->print("+ offset "); |
| 2445 | 631 } |
| 632 | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
633 CmpUNode* cmp = new (C) CmpUNode(max_idx_expr, range); |
| 2445 | 634 register_new_node(cmp, ctrl); |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
635 BoolNode* bol = new (C) BoolNode(cmp, BoolTest::lt); |
| 2445 | 636 register_new_node(bol, ctrl); |
| 637 | |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
638 if (TraceLoopPredicate) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
639 predString->print_cr("<u range"); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
640 tty->print(predString->as_string()); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2445
diff
changeset
|
641 } |
| 2445 | 642 return bol; |
| 643 } | |
| 644 | |
| 645 //------------------------------ loop_predication_impl-------------------------- | |
| 646 // Insert loop predicates for null checks and range checks | |
| 647 bool PhaseIdealLoop::loop_predication_impl(IdealLoopTree *loop) { | |
| 648 if (!UseLoopPredicate) return false; | |
| 649 | |
| 650 if (!loop->_head->is_Loop()) { | |
| 651 // Could be a simple region when irreducible loops are present. | |
| 652 return false; | |
| 653 } | |
| 3345 | 654 LoopNode* head = loop->_head->as_Loop(); |
| 2445 | 655 |
| 3345 | 656 if (head->unique_ctrl_out()->Opcode() == Op_NeverBranch) { |
| 2445 | 657 // do nothing for infinite loops |
| 658 return false; | |
| 659 } | |
| 660 | |
| 661 CountedLoopNode *cl = NULL; | |
|
3850
6987871cfb9b
7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents:
3845
diff
changeset
|
662 if (head->is_valid_counted_loop()) { |
| 3345 | 663 cl = head->as_CountedLoop(); |
| 2445 | 664 // do nothing for iteration-splitted loops |
| 665 if (!cl->is_normal_loop()) return false; | |
|
3840
4e761e7e6e12
7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents:
3345
diff
changeset
|
666 // Avoid RCE if Counted loop's test is '!='. |
|
4e761e7e6e12
7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents:
3345
diff
changeset
|
667 BoolTest::mask bt = cl->loopexit()->test_trip(); |
|
4e761e7e6e12
7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents:
3345
diff
changeset
|
668 if (bt != BoolTest::lt && bt != BoolTest::gt) |
|
4e761e7e6e12
7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents:
3345
diff
changeset
|
669 cl = NULL; |
| 2445 | 670 } |
| 671 | |
| 3345 | 672 Node* entry = head->in(LoopNode::EntryControl); |
| 673 ProjNode *predicate_proj = NULL; | |
| 674 // Loop limit check predicate should be near the loop. | |
| 675 if (LoopLimitCheck) { | |
| 676 predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check); | |
| 677 if (predicate_proj != NULL) | |
| 678 entry = predicate_proj->in(0)->in(0); | |
| 679 } | |
| 2445 | 680 |
| 3345 | 681 predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate); |
| 2445 | 682 if (!predicate_proj) { |
| 683 #ifndef PRODUCT | |
| 684 if (TraceLoopPredicate) { | |
| 685 tty->print("missing predicate:"); | |
| 686 loop->dump_head(); | |
| 3345 | 687 head->dump(1); |
| 2445 | 688 } |
| 689 #endif | |
| 690 return false; | |
| 691 } | |
| 692 ConNode* zero = _igvn.intcon(0); | |
| 693 set_ctrl(zero, C->root()); | |
| 694 | |
| 695 ResourceArea *area = Thread::current()->resource_area(); | |
| 696 Invariance invar(area, loop); | |
| 697 | |
| 698 // Create list of if-projs such that a newer proj dominates all older | |
| 699 // projs in the list, and they all dominate loop->tail() | |
| 700 Node_List if_proj_list(area); | |
| 701 Node *current_proj = loop->tail(); //start from tail | |
| 702 while (current_proj != head) { | |
| 703 if (loop == get_loop(current_proj) && // still in the loop ? | |
| 704 current_proj->is_Proj() && // is a projection ? | |
| 705 current_proj->in(0)->Opcode() == Op_If) { // is a if projection ? | |
| 706 if_proj_list.push(current_proj); | |
| 707 } | |
| 708 current_proj = idom(current_proj); | |
| 709 } | |
| 710 | |
| 711 bool hoisted = false; // true if at least one proj is promoted | |
| 712 while (if_proj_list.size() > 0) { | |
| 713 // Following are changed to nonnull when a predicate can be hoisted | |
| 714 ProjNode* new_predicate_proj = NULL; | |
| 715 | |
| 716 ProjNode* proj = if_proj_list.pop()->as_Proj(); | |
| 717 IfNode* iff = proj->in(0)->as_If(); | |
| 718 | |
|
12956
3213ba4d3dff
8024069: replace_in_map() should operate on parent maps
roland
parents:
10278
diff
changeset
|
719 if (!proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none)) { |
| 2445 | 720 if (loop->is_loop_exit(iff)) { |
| 721 // stop processing the remaining projs in the list because the execution of them | |
| 722 // depends on the condition of "iff" (iff->in(1)). | |
| 723 break; | |
| 724 } else { | |
| 725 // Both arms are inside the loop. There are two cases: | |
| 726 // (1) there is one backward branch. In this case, any remaining proj | |
| 727 // in the if_proj list post-dominates "iff". So, the condition of "iff" | |
| 728 // does not determine the execution the remining projs directly, and we | |
| 729 // can safely continue. | |
| 730 // (2) both arms are forwarded, i.e. a diamond shape. In this case, "proj" | |
| 731 // does not dominate loop->tail(), so it can not be in the if_proj list. | |
| 732 continue; | |
| 733 } | |
| 734 } | |
| 735 | |
| 736 Node* test = iff->in(1); | |
| 737 if (!test->is_Bool()){ //Conv2B, ... | |
| 738 continue; | |
| 739 } | |
| 740 BoolNode* bol = test->as_Bool(); | |
| 741 if (invar.is_invariant(bol)) { | |
| 742 // Invariant test | |
| 743 new_predicate_proj = create_new_if_for_predicate(predicate_proj, NULL, | |
| 744 Deoptimization::Reason_predicate); | |
| 745 Node* ctrl = new_predicate_proj->in(0)->as_If()->in(0); | |
| 746 BoolNode* new_predicate_bol = invar.clone(bol, ctrl)->as_Bool(); | |
| 747 | |
| 748 // Negate test if necessary | |
| 749 bool negated = false; | |
| 750 if (proj->_con != predicate_proj->_con) { | |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6144
diff
changeset
|
751 new_predicate_bol = new (C) BoolNode(new_predicate_bol->in(1), new_predicate_bol->_test.negate()); |
| 2445 | 752 register_new_node(new_predicate_bol, ctrl); |
| 753 negated = true; | |
| 754 } | |
| 755 IfNode* new_predicate_iff = new_predicate_proj->in(0)->as_If(); | |
| 756 _igvn.hash_delete(new_predicate_iff); | |
| 757 new_predicate_iff->set_req(1, new_predicate_bol); | |
| 758 #ifndef PRODUCT | |
| 759 if (TraceLoopPredicate) { | |
| 760 tty->print("Predicate invariant if%s: %d ", negated ? " negated" : "", new_predicate_iff->_idx); | |
| 761 loop->dump_head(); | |
| 762 } else if (TraceLoopOpts) { | |
| 763 tty->print("Predicate IC "); | |
| 764 loop->dump_head(); | |
| 765 } | |
| 766 #endif | |
| 10278 | 767 } else if ((cl != NULL) && (proj->_con == predicate_proj->_con) && |
| 768 loop->is_range_check_if(iff, this, invar)) { | |
| 2445 | 769 |
| 770 // Range check for counted loops | |
| 771 const Node* cmp = bol->in(1)->as_Cmp(); | |
| 772 Node* idx = cmp->in(1); | |
| 773 assert(!invar.is_invariant(idx), "index is variant"); | |
| 774 Node* rng = cmp->in(2); | |
| 3345 | 775 assert(rng->Opcode() == Op_LoadRange || _igvn.type(rng)->is_int() >= 0, "must be"); |
| 2445 | 776 assert(invar.is_invariant(rng), "range must be invariant"); |
| 777 int scale = 1; | |
| 778 Node* offset = zero; | |
| 779 bool ok = is_scaled_iv_plus_offset(idx, cl->phi(), &scale, &offset); | |
| 780 assert(ok, "must be index expression"); | |
| 781 | |
| 782 Node* init = cl->init_trip(); | |
| 783 Node* limit = cl->limit(); | |
| 784 Node* stride = cl->stride(); | |
| 785 | |
| 786 // Build if's for the upper and lower bound tests. The | |
| 787 // lower_bound test will dominate the upper bound test and all | |
| 788 // cloned or created nodes will use the lower bound test as | |
| 789 // their declared control. | |
| 790 ProjNode* lower_bound_proj = create_new_if_for_predicate(predicate_proj, NULL, Deoptimization::Reason_predicate); | |
| 791 ProjNode* upper_bound_proj = create_new_if_for_predicate(predicate_proj, NULL, Deoptimization::Reason_predicate); | |
| 792 assert(upper_bound_proj->in(0)->as_If()->in(0) == lower_bound_proj, "should dominate"); | |
| 793 Node *ctrl = lower_bound_proj->in(0)->as_If()->in(0); | |
| 794 | |
| 795 // Perform cloning to keep Invariance state correct since the | |
| 796 // late schedule will place invariant things in the loop. | |
| 797 rng = invar.clone(rng, ctrl); | |
| 798 if (offset && offset != zero) { | |
| 799 assert(invar.is_invariant(offset), "offset must be loop invariant"); | |
| 800 offset = invar.clone(offset, ctrl); | |
| 801 } | |
| 802 | |
| 803 // Test the lower bound | |
| 3345 | 804 Node* lower_bound_bol = rc_predicate(loop, ctrl, scale, offset, init, limit, stride, rng, false); |
| 2445 | 805 IfNode* lower_bound_iff = lower_bound_proj->in(0)->as_If(); |
| 806 _igvn.hash_delete(lower_bound_iff); | |
| 807 lower_bound_iff->set_req(1, lower_bound_bol); | |
| 808 if (TraceLoopPredicate) tty->print_cr("lower bound check if: %d", lower_bound_iff->_idx); | |
| 809 | |
| 810 // Test the upper bound | |
|
3840
4e761e7e6e12
7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents:
3345
diff
changeset
|
811 Node* upper_bound_bol = rc_predicate(loop, lower_bound_proj, scale, offset, init, limit, stride, rng, true); |
| 2445 | 812 IfNode* upper_bound_iff = upper_bound_proj->in(0)->as_If(); |
| 813 _igvn.hash_delete(upper_bound_iff); | |
| 814 upper_bound_iff->set_req(1, upper_bound_bol); | |
| 815 if (TraceLoopPredicate) tty->print_cr("upper bound check if: %d", lower_bound_iff->_idx); | |
| 816 | |
| 817 // Fall through into rest of the clean up code which will move | |
| 818 // any dependent nodes onto the upper bound test. | |
| 819 new_predicate_proj = upper_bound_proj; | |
| 820 | |
| 821 #ifndef PRODUCT | |
| 822 if (TraceLoopOpts && !TraceLoopPredicate) { | |
| 823 tty->print("Predicate RC "); | |
| 824 loop->dump_head(); | |
| 825 } | |
| 826 #endif | |
| 827 } else { | |
| 828 // Loop variant check (for example, range check in non-counted loop) | |
| 829 // with uncommon trap. | |
| 830 continue; | |
| 831 } | |
| 832 assert(new_predicate_proj != NULL, "sanity"); | |
| 833 // Success - attach condition (new_predicate_bol) to predicate if | |
| 834 invar.map_ctrl(proj, new_predicate_proj); // so that invariance test can be appropriate | |
| 835 | |
| 836 // Eliminate the old If in the loop body | |
| 837 dominated_by( new_predicate_proj, iff, proj->_con != new_predicate_proj->_con ); | |
| 838 | |
| 839 hoisted = true; | |
| 840 C->set_major_progress(); | |
| 841 } // end while | |
| 842 | |
| 843 #ifndef PRODUCT | |
| 844 // report that the loop predication has been actually performed | |
| 845 // for this loop | |
| 846 if (TraceLoopPredicate && hoisted) { | |
| 847 tty->print("Loop Predication Performed:"); | |
| 848 loop->dump_head(); | |
| 849 } | |
| 850 #endif | |
| 851 | |
| 852 return hoisted; | |
| 853 } | |
| 854 | |
| 855 //------------------------------loop_predication-------------------------------- | |
| 856 // driver routine for loop predication optimization | |
| 857 bool IdealLoopTree::loop_predication( PhaseIdealLoop *phase) { | |
| 858 bool hoisted = false; | |
| 859 // Recursively promote predicates | |
| 860 if (_child) { | |
| 861 hoisted = _child->loop_predication( phase); | |
| 862 } | |
| 863 | |
| 864 // self | |
| 865 if (!_irreducible && !tail()->is_top()) { | |
| 866 hoisted |= phase->loop_predication_impl(this); | |
| 867 } | |
| 868 | |
| 869 if (_next) { //sibling | |
| 870 hoisted |= _next->loop_predication( phase); | |
| 871 } | |
| 872 | |
| 873 return hoisted; | |
| 874 } |