Mercurial > hg > truffle
annotate src/share/vm/c1/c1_ValueMap.cpp @ 6842:b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp
| author | mikael |
|---|---|
| date | Tue, 09 Oct 2012 10:09:34 -0700 |
| parents | 0bfcb7a3e12d |
| children | 46f6f063b272 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 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 "c1/c1_Canonicalizer.hpp" | |
| 27 #include "c1/c1_IR.hpp" | |
| 28 #include "c1/c1_ValueMap.hpp" | |
| 29 #include "utilities/bitMap.inline.hpp" | |
| 0 | 30 |
| 31 | |
| 32 #ifndef PRODUCT | |
| 33 | |
| 34 int ValueMap::_number_of_finds = 0; | |
| 35 int ValueMap::_number_of_hits = 0; | |
| 36 int ValueMap::_number_of_kills = 0; | |
| 37 | |
| 38 #define TRACE_VALUE_NUMBERING(code) if (PrintValueNumbering) { code; } | |
| 39 | |
| 40 #else | |
| 41 | |
| 42 #define TRACE_VALUE_NUMBERING(code) | |
| 43 | |
| 44 #endif | |
| 45 | |
| 46 | |
| 47 ValueMap::ValueMap() | |
| 48 : _nesting(0) | |
| 49 , _entries(ValueMapInitialSize, NULL) | |
| 50 , _killed_values() | |
| 51 , _entry_count(0) | |
| 52 { | |
| 53 NOT_PRODUCT(reset_statistics()); | |
| 54 } | |
| 55 | |
| 56 | |
| 57 ValueMap::ValueMap(ValueMap* old) | |
| 58 : _nesting(old->_nesting + 1) | |
| 59 , _entries(old->_entries.length()) | |
| 60 , _killed_values() | |
| 61 , _entry_count(old->_entry_count) | |
| 62 { | |
| 63 for (int i = size() - 1; i >= 0; i--) { | |
| 64 _entries.at_put(i, old->entry_at(i)); | |
| 65 } | |
| 66 _killed_values.set_from(&old->_killed_values); | |
| 67 } | |
| 68 | |
| 69 | |
| 70 void ValueMap::increase_table_size() { | |
| 71 int old_size = size(); | |
| 72 int new_size = old_size * 2 + 1; | |
| 73 | |
| 74 ValueMapEntryList worklist(8); | |
| 75 ValueMapEntryArray new_entries(new_size, NULL); | |
| 76 int new_entry_count = 0; | |
| 77 | |
| 78 TRACE_VALUE_NUMBERING(tty->print_cr("increasing table size from %d to %d", old_size, new_size)); | |
| 79 | |
| 80 for (int i = old_size - 1; i >= 0; i--) { | |
| 81 ValueMapEntry* entry; | |
| 82 for (entry = entry_at(i); entry != NULL; entry = entry->next()) { | |
| 83 if (!is_killed(entry->value())) { | |
| 84 worklist.push(entry); | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 while (!worklist.is_empty()) { | |
| 89 entry = worklist.pop(); | |
| 90 int new_index = entry_index(entry->hash(), new_size); | |
| 91 | |
| 92 if (entry->nesting() != nesting() && new_entries.at(new_index) != entry->next()) { | |
| 93 // changing entries with a lower nesting than the current nesting of the table | |
| 94 // is not allowed because then the same entry is contained in multiple value maps. | |
| 95 // clone entry when next-pointer must be changed | |
| 96 entry = new ValueMapEntry(entry->hash(), entry->value(), entry->nesting(), NULL); | |
| 97 } | |
| 98 entry->set_next(new_entries.at(new_index)); | |
| 99 new_entries.at_put(new_index, entry); | |
| 100 new_entry_count++; | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 _entries = new_entries; | |
| 105 _entry_count = new_entry_count; | |
| 106 } | |
| 107 | |
| 108 | |
| 109 Value ValueMap::find_insert(Value x) { | |
| 110 const intx hash = x->hash(); | |
| 111 if (hash != 0) { | |
| 112 // 0 hash means: exclude from value numbering | |
| 113 NOT_PRODUCT(_number_of_finds++); | |
| 114 | |
| 115 for (ValueMapEntry* entry = entry_at(entry_index(hash, size())); entry != NULL; entry = entry->next()) { | |
| 116 if (entry->hash() == hash) { | |
| 117 Value f = entry->value(); | |
| 118 | |
| 119 if (!is_killed(f) && f->is_equal(x)) { | |
| 120 NOT_PRODUCT(_number_of_hits++); | |
| 121 TRACE_VALUE_NUMBERING(tty->print_cr("Value Numbering: %s %c%d equal to %c%d (size %d, entries %d, nesting-diff %d)", x->name(), x->type()->tchar(), x->id(), f->type()->tchar(), f->id(), size(), entry_count(), nesting() - entry->nesting())); | |
| 122 | |
| 123 if (entry->nesting() != nesting() && f->as_Constant() == NULL) { | |
| 124 // non-constant values of of another block must be pinned, | |
| 125 // otherwise it is possible that they are not evaluated | |
| 126 f->pin(Instruction::PinGlobalValueNumbering); | |
| 127 } | |
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128 assert(x->type()->tag() == f->type()->tag(), "should have same type"); |
| 0 | 129 |
| 130 return f; | |
| 131 | |
| 132 } | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 // x not found, so insert it | |
| 137 if (entry_count() >= size_threshold()) { | |
| 138 increase_table_size(); | |
| 139 } | |
| 140 int idx = entry_index(hash, size()); | |
| 141 _entries.at_put(idx, new ValueMapEntry(hash, x, nesting(), entry_at(idx))); | |
| 142 _entry_count++; | |
| 143 | |
| 144 TRACE_VALUE_NUMBERING(tty->print_cr("Value Numbering: insert %s %c%d (size %d, entries %d, nesting %d)", x->name(), x->type()->tchar(), x->id(), size(), entry_count(), nesting())); | |
| 145 } | |
| 146 | |
| 147 return x; | |
| 148 } | |
| 149 | |
| 150 | |
| 151 #define GENERIC_KILL_VALUE(must_kill_implementation) \ | |
| 152 NOT_PRODUCT(_number_of_kills++); \ | |
| 153 \ | |
| 154 for (int i = size() - 1; i >= 0; i--) { \ | |
| 155 ValueMapEntry* prev_entry = NULL; \ | |
| 156 for (ValueMapEntry* entry = entry_at(i); entry != NULL; entry = entry->next()) { \ | |
| 157 Value value = entry->value(); \ | |
| 158 \ | |
| 159 must_kill_implementation(must_kill, entry, value) \ | |
| 160 \ | |
| 161 if (must_kill) { \ | |
| 162 kill_value(value); \ | |
| 163 \ | |
| 164 if (prev_entry == NULL) { \ | |
| 165 _entries.at_put(i, entry->next()); \ | |
| 166 _entry_count--; \ | |
| 167 } else if (prev_entry->nesting() == nesting()) { \ | |
| 168 prev_entry->set_next(entry->next()); \ | |
| 169 _entry_count--; \ | |
| 170 } else { \ | |
| 171 prev_entry = entry; \ | |
| 172 } \ | |
| 173 \ | |
| 174 TRACE_VALUE_NUMBERING(tty->print_cr("Value Numbering: killed %s %c%d (size %d, entries %d, nesting-diff %d)", value->name(), value->type()->tchar(), value->id(), size(), entry_count(), nesting() - entry->nesting())); \ | |
| 175 } else { \ | |
| 176 prev_entry = entry; \ | |
| 177 } \ | |
| 178 } \ | |
| 179 } \ | |
| 180 | |
| 181 #define MUST_KILL_MEMORY(must_kill, entry, value) \ | |
| 182 bool must_kill = value->as_LoadField() != NULL || value->as_LoadIndexed() != NULL; | |
| 183 | |
| 184 #define MUST_KILL_ARRAY(must_kill, entry, value) \ | |
| 185 bool must_kill = value->as_LoadIndexed() != NULL \ | |
| 186 && value->type()->tag() == type->tag(); | |
| 187 | |
| 188 #define MUST_KILL_FIELD(must_kill, entry, value) \ | |
| 189 /* ciField's are not unique; must compare their contents */ \ | |
| 190 LoadField* lf = value->as_LoadField(); \ | |
| 191 bool must_kill = lf != NULL \ | |
| 192 && lf->field()->holder() == field->holder() \ | |
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193 && (all_offsets || lf->field()->offset() == field->offset()); |
| 0 | 194 |
| 195 #define MUST_KILL_EXCEPTION(must_kill, entry, value) \ | |
| 196 assert(entry->nesting() < nesting(), "must not find bigger nesting than current"); \ | |
| 197 bool must_kill = (entry->nesting() == nesting() - 1); | |
| 198 | |
| 199 | |
| 200 void ValueMap::kill_memory() { | |
| 201 GENERIC_KILL_VALUE(MUST_KILL_MEMORY); | |
| 202 } | |
| 203 | |
| 204 void ValueMap::kill_array(ValueType* type) { | |
| 205 GENERIC_KILL_VALUE(MUST_KILL_ARRAY); | |
| 206 } | |
| 207 | |
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208 void ValueMap::kill_field(ciField* field, bool all_offsets) { |
| 0 | 209 GENERIC_KILL_VALUE(MUST_KILL_FIELD); |
| 210 } | |
| 211 | |
| 212 void ValueMap::kill_exception() { | |
| 213 GENERIC_KILL_VALUE(MUST_KILL_EXCEPTION); | |
| 214 } | |
| 215 | |
| 216 | |
| 217 void ValueMap::kill_map(ValueMap* map) { | |
| 218 assert(is_global_value_numbering(), "only for global value numbering"); | |
| 219 _killed_values.set_union(&map->_killed_values); | |
| 220 } | |
| 221 | |
| 222 void ValueMap::kill_all() { | |
| 223 assert(is_local_value_numbering(), "only for local value numbering"); | |
| 224 for (int i = size() - 1; i >= 0; i--) { | |
| 225 _entries.at_put(i, NULL); | |
| 226 } | |
| 227 _entry_count = 0; | |
| 228 } | |
| 229 | |
| 230 | |
| 231 #ifndef PRODUCT | |
| 232 | |
| 233 void ValueMap::print() { | |
| 234 tty->print_cr("(size %d, entries %d, nesting %d)", size(), entry_count(), nesting()); | |
| 235 | |
| 236 int entries = 0; | |
| 237 for (int i = 0; i < size(); i++) { | |
| 238 if (entry_at(i) != NULL) { | |
| 239 tty->print(" %2d: ", i); | |
| 240 for (ValueMapEntry* entry = entry_at(i); entry != NULL; entry = entry->next()) { | |
| 241 Value value = entry->value(); | |
| 242 tty->print("%s %c%d (%s%d) -> ", value->name(), value->type()->tchar(), value->id(), is_killed(value) ? "x" : "", entry->nesting()); | |
| 243 entries++; | |
| 244 } | |
| 245 tty->print_cr("NULL"); | |
| 246 } | |
| 247 } | |
| 248 | |
| 249 _killed_values.print(); | |
| 250 assert(entry_count() == entries, "entry_count incorrect"); | |
| 251 } | |
| 252 | |
| 253 void ValueMap::reset_statistics() { | |
| 254 _number_of_finds = 0; | |
| 255 _number_of_hits = 0; | |
| 256 _number_of_kills = 0; | |
| 257 } | |
| 258 | |
| 259 void ValueMap::print_statistics() { | |
| 260 float hit_rate = 0; | |
| 261 if (_number_of_finds != 0) { | |
| 262 hit_rate = (float)_number_of_hits / _number_of_finds; | |
| 263 } | |
| 264 | |
| 265 tty->print_cr("finds:%3d hits:%3d kills:%3d hit rate: %1.4f", _number_of_finds, _number_of_hits, _number_of_kills, hit_rate); | |
| 266 } | |
| 267 | |
| 268 #endif | |
| 269 | |
| 270 | |
| 271 | |
| 272 class ShortLoopOptimizer : public ValueNumberingVisitor { | |
| 273 private: | |
| 274 GlobalValueNumbering* _gvn; | |
| 275 BlockList _loop_blocks; | |
| 276 bool _too_complicated_loop; | |
| 277 | |
| 278 // simplified access to methods of GlobalValueNumbering | |
| 279 ValueMap* current_map() { return _gvn->current_map(); } | |
| 280 ValueMap* value_map_of(BlockBegin* block) { return _gvn->value_map_of(block); } | |
| 281 | |
| 282 // implementation for abstract methods of ValueNumberingVisitor | |
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283 void kill_memory() { _too_complicated_loop = true; } |
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284 void kill_field(ciField* field, bool all_offsets) { current_map()->kill_field(field, all_offsets); }; |
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285 void kill_array(ValueType* type) { current_map()->kill_array(type); }; |
| 0 | 286 |
| 287 public: | |
| 288 ShortLoopOptimizer(GlobalValueNumbering* gvn) | |
| 289 : _gvn(gvn) | |
| 290 , _loop_blocks(ValueMapMaxLoopSize) | |
| 291 , _too_complicated_loop(false) | |
| 292 { | |
| 293 } | |
| 294 | |
| 295 bool process(BlockBegin* loop_header); | |
| 296 }; | |
| 297 | |
| 298 | |
| 299 bool ShortLoopOptimizer::process(BlockBegin* loop_header) { | |
| 300 TRACE_VALUE_NUMBERING(tty->print_cr("** loop header block")); | |
| 301 | |
| 302 _too_complicated_loop = false; | |
| 303 _loop_blocks.clear(); | |
| 304 _loop_blocks.append(loop_header); | |
| 305 | |
| 306 for (int i = 0; i < _loop_blocks.length(); i++) { | |
| 307 BlockBegin* block = _loop_blocks.at(i); | |
| 308 TRACE_VALUE_NUMBERING(tty->print_cr("processing loop block B%d", block->block_id())); | |
| 309 | |
| 310 if (block->is_set(BlockBegin::exception_entry_flag)) { | |
| 311 // this would be too complicated | |
| 312 return false; | |
| 313 } | |
| 314 | |
| 315 // add predecessors to worklist | |
| 316 for (int j = block->number_of_preds() - 1; j >= 0; j--) { | |
| 317 BlockBegin* pred = block->pred_at(j); | |
| 318 | |
| 319 ValueMap* pred_map = value_map_of(pred); | |
| 320 if (pred_map != NULL) { | |
| 321 current_map()->kill_map(pred_map); | |
| 322 } else if (!_loop_blocks.contains(pred)) { | |
| 323 if (_loop_blocks.length() >= ValueMapMaxLoopSize) { | |
| 324 return false; | |
| 325 } | |
| 326 _loop_blocks.append(pred); | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 // use the instruction visitor for killing values | |
| 331 for (Value instr = block->next(); instr != NULL; instr = instr->next()) { | |
| 332 instr->visit(this); | |
| 333 if (_too_complicated_loop) { | |
| 334 return false; | |
| 335 } | |
| 336 } | |
| 337 } | |
| 338 | |
| 339 TRACE_VALUE_NUMBERING(tty->print_cr("** loop successfully optimized")); | |
| 340 return true; | |
| 341 } | |
| 342 | |
| 343 | |
| 344 GlobalValueNumbering::GlobalValueNumbering(IR* ir) | |
| 345 : _current_map(NULL) | |
| 346 , _value_maps(ir->linear_scan_order()->length(), NULL) | |
| 347 { | |
| 348 TRACE_VALUE_NUMBERING(tty->print_cr("****** start of global value numbering")); | |
| 349 | |
| 350 ShortLoopOptimizer short_loop_optimizer(this); | |
| 351 int subst_count = 0; | |
| 352 | |
| 353 BlockList* blocks = ir->linear_scan_order(); | |
| 354 int num_blocks = blocks->length(); | |
| 355 | |
| 356 BlockBegin* start_block = blocks->at(0); | |
| 357 assert(start_block == ir->start() && start_block->number_of_preds() == 0 && start_block->dominator() == NULL, "must be start block"); | |
| 358 assert(start_block->next()->as_Base() != NULL && start_block->next()->next() == NULL, "start block must not have instructions"); | |
| 359 | |
| 360 // initial, empty value map with nesting 0 | |
| 361 set_value_map_of(start_block, new ValueMap()); | |
| 362 | |
| 363 for (int i = 1; i < num_blocks; i++) { | |
| 364 BlockBegin* block = blocks->at(i); | |
| 365 TRACE_VALUE_NUMBERING(tty->print_cr("**** processing block B%d", block->block_id())); | |
| 366 | |
| 367 int num_preds = block->number_of_preds(); | |
| 368 assert(num_preds > 0, "block must have predecessors"); | |
| 369 | |
| 370 BlockBegin* dominator = block->dominator(); | |
| 371 assert(dominator != NULL, "dominator must exist"); | |
| 372 assert(value_map_of(dominator) != NULL, "value map of dominator must exist"); | |
| 373 | |
| 374 // create new value map with increased nesting | |
| 375 _current_map = new ValueMap(value_map_of(dominator)); | |
| 376 | |
| 377 if (num_preds == 1) { | |
| 378 assert(dominator == block->pred_at(0), "dominator must be equal to predecessor"); | |
| 379 // nothing to do here | |
| 380 | |
| 381 } else if (block->is_set(BlockBegin::linear_scan_loop_header_flag)) { | |
| 382 // block has incoming backward branches -> try to optimize short loops | |
| 383 if (!short_loop_optimizer.process(block)) { | |
| 384 // loop is too complicated, so kill all memory loads because there might be | |
| 385 // stores to them in the loop | |
| 386 current_map()->kill_memory(); | |
| 387 } | |
| 388 | |
| 389 } else { | |
| 390 // only incoming forward branches that are already processed | |
| 391 for (int j = 0; j < num_preds; j++) { | |
| 392 BlockBegin* pred = block->pred_at(j); | |
| 393 ValueMap* pred_map = value_map_of(pred); | |
| 394 | |
| 395 if (pred_map != NULL) { | |
| 396 // propagate killed values of the predecessor to this block | |
| 397 current_map()->kill_map(value_map_of(pred)); | |
| 398 } else { | |
| 399 // kill all memory loads because predecessor not yet processed | |
| 400 // (this can happen with non-natural loops and OSR-compiles) | |
| 401 current_map()->kill_memory(); | |
| 402 } | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 if (block->is_set(BlockBegin::exception_entry_flag)) { | |
| 407 current_map()->kill_exception(); | |
| 408 } | |
| 409 | |
| 410 TRACE_VALUE_NUMBERING(tty->print("value map before processing block: "); current_map()->print()); | |
| 411 | |
| 412 // visit all instructions of this block | |
| 413 for (Value instr = block->next(); instr != NULL; instr = instr->next()) { | |
| 414 assert(!instr->has_subst(), "substitution already set"); | |
| 415 | |
| 416 // check if instruction kills any values | |
| 417 instr->visit(this); | |
| 418 | |
| 419 if (instr->hash() != 0) { | |
| 420 Value f = current_map()->find_insert(instr); | |
| 421 if (f != instr) { | |
| 422 assert(!f->has_subst(), "can't have a substitution"); | |
| 423 instr->set_subst(f); | |
| 424 subst_count++; | |
| 425 } | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 // remember value map for successors | |
| 430 set_value_map_of(block, current_map()); | |
| 431 } | |
| 432 | |
| 433 if (subst_count != 0) { | |
| 434 SubstitutionResolver resolver(ir); | |
| 435 } | |
| 436 | |
| 437 TRACE_VALUE_NUMBERING(tty->print("****** end of global value numbering. "); ValueMap::print_statistics()); | |
| 438 } |