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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "v8.h" | 5 #include "v8.h" |
6 | 6 |
7 #include "lithium-allocator-inl.h" | 7 #include "lithium-allocator-inl.h" |
8 #include "arm/lithium-arm.h" | 8 #include "arm/lithium-arm.h" |
9 #include "arm/lithium-codegen-arm.h" | 9 #include "arm/lithium-codegen-arm.h" |
10 #include "hydrogen-osr.h" | 10 #include "hydrogen-osr.h" |
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843 // Make sure that the lithium instruction has either no fixed register | 843 // Make sure that the lithium instruction has either no fixed register |
844 // constraints in temps or the result OR no uses that are only used at | 844 // constraints in temps or the result OR no uses that are only used at |
845 // start. If this invariant doesn't hold, the register allocator can decide | 845 // start. If this invariant doesn't hold, the register allocator can decide |
846 // to insert a split of a range immediately before the instruction due to an | 846 // to insert a split of a range immediately before the instruction due to an |
847 // already allocated register needing to be used for the instruction's fixed | 847 // already allocated register needing to be used for the instruction's fixed |
848 // register constraint. In this case, The register allocator won't see an | 848 // register constraint. In this case, The register allocator won't see an |
849 // interference between the split child and the use-at-start (it would if | 849 // interference between the split child and the use-at-start (it would if |
850 // the it was just a plain use), so it is free to move the split child into | 850 // the it was just a plain use), so it is free to move the split child into |
851 // the same register that is used for the use-at-start. | 851 // the same register that is used for the use-at-start. |
852 // See https://code.google.com/p/chromium/issues/detail?id=201590 | 852 // See https://code.google.com/p/chromium/issues/detail?id=201590 |
853 if (!(instr->ClobbersRegisters() && instr->ClobbersDoubleRegisters())) { | 853 if (!(instr->ClobbersRegisters() && |
| 854 instr->ClobbersDoubleRegisters(isolate()))) { |
854 int fixed = 0; | 855 int fixed = 0; |
855 int used_at_start = 0; | 856 int used_at_start = 0; |
856 for (UseIterator it(instr); !it.Done(); it.Advance()) { | 857 for (UseIterator it(instr); !it.Done(); it.Advance()) { |
857 LUnallocated* operand = LUnallocated::cast(it.Current()); | 858 LUnallocated* operand = LUnallocated::cast(it.Current()); |
858 if (operand->IsUsedAtStart()) ++used_at_start; | 859 if (operand->IsUsedAtStart()) ++used_at_start; |
859 } | 860 } |
860 if (instr->Output() != NULL) { | 861 if (instr->Output() != NULL) { |
861 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; | 862 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; |
862 } | 863 } |
863 for (TempIterator it(instr); !it.Done(); it.Advance()) { | 864 for (TempIterator it(instr); !it.Done(); it.Advance()) { |
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2558 | 2559 |
2559 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) { | 2560 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) { |
2560 LOperand* object = UseRegister(instr->object()); | 2561 LOperand* object = UseRegister(instr->object()); |
2561 LOperand* index = UseRegister(instr->index()); | 2562 LOperand* index = UseRegister(instr->index()); |
2562 LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index); | 2563 LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index); |
2563 LInstruction* result = DefineSameAsFirst(load); | 2564 LInstruction* result = DefineSameAsFirst(load); |
2564 return AssignPointerMap(result); | 2565 return AssignPointerMap(result); |
2565 } | 2566 } |
2566 | 2567 |
2567 } } // namespace v8::internal | 2568 } } // namespace v8::internal |
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