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Issue 236843002: Revert "Track field types." (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 8 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved. 1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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375 instr->DeleteAndReplaceWith(instr->value()); 375 instr->DeleteAndReplaceWith(instr->value());
376 INC_STAT(removed_); 376 INC_STAT(removed_);
377 } else if (value != instr) { 377 } else if (value != instr) {
378 instr->DeleteAndReplaceWith(value); 378 instr->DeleteAndReplaceWith(value);
379 INC_STAT(redundant_); 379 INC_STAT(redundant_);
380 } 380 }
381 } 381 }
382 382
383 void ReduceLoadNamedField(HLoadNamedField* instr) { 383 void ReduceLoadNamedField(HLoadNamedField* instr) {
384 // Reduce a load of the map field when it is known to be a constant. 384 // Reduce a load of the map field when it is known to be a constant.
385 if (!IsMapAccess(instr->access())) { 385 if (!IsMapAccess(instr->access())) return;
386 // Check if we introduce a map here.
387 if (!instr->map().IsNull()) {
388 Insert(instr, instr, instr->map());
389 }
390 return;
391 }
392 386
393 HValue* object = instr->object()->ActualValue(); 387 HValue* object = instr->object()->ActualValue();
394 MapSet maps = FindMaps(object); 388 MapSet maps = FindMaps(object);
395 if (maps == NULL || maps->size() != 1) return; // Not a constant. 389 if (maps == NULL || maps->size() != 1) return; // Not a constant.
396 390
397 Unique<Map> map = maps->at(0); 391 Unique<Map> map = maps->at(0);
398 HConstant* constant = HConstant::CreateAndInsertBefore( 392 HConstant* constant = HConstant::CreateAndInsertBefore(
399 instr->block()->graph()->zone(), map, true, instr); 393 instr->block()->graph()->zone(), map, true, instr);
400 instr->DeleteAndReplaceWith(constant); 394 instr->DeleteAndReplaceWith(constant);
401 INC_STAT(loads_); 395 INC_STAT(loads_);
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742 PRINT_STAT(removed_cho); 736 PRINT_STAT(removed_cho);
743 PRINT_STAT(narrowed); 737 PRINT_STAT(narrowed);
744 PRINT_STAT(loads); 738 PRINT_STAT(loads);
745 PRINT_STAT(empty); 739 PRINT_STAT(empty);
746 PRINT_STAT(compares_true); 740 PRINT_STAT(compares_true);
747 PRINT_STAT(compares_false); 741 PRINT_STAT(compares_false);
748 PRINT_STAT(transitions); 742 PRINT_STAT(transitions);
749 } 743 }
750 744
751 } } // namespace v8::internal 745 } } // namespace v8::internal
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