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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 // 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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887 // Make sure that the lithium instruction has either no fixed register | 887 // Make sure that the lithium instruction has either no fixed register |
888 // constraints in temps or the result OR no uses that are only used at | 888 // constraints in temps or the result OR no uses that are only used at |
889 // start. If this invariant doesn't hold, the register allocator can decide | 889 // start. If this invariant doesn't hold, the register allocator can decide |
890 // to insert a split of a range immediately before the instruction due to an | 890 // to insert a split of a range immediately before the instruction due to an |
891 // already allocated register needing to be used for the instruction's fixed | 891 // already allocated register needing to be used for the instruction's fixed |
892 // register constraint. In this case, The register allocator won't see an | 892 // register constraint. In this case, The register allocator won't see an |
893 // interference between the split child and the use-at-start (it would if | 893 // interference between the split child and the use-at-start (it would if |
894 // the it was just a plain use), so it is free to move the split child into | 894 // the it was just a plain use), so it is free to move the split child into |
895 // the same register that is used for the use-at-start. | 895 // the same register that is used for the use-at-start. |
896 // See https://code.google.com/p/chromium/issues/detail?id=201590 | 896 // See https://code.google.com/p/chromium/issues/detail?id=201590 |
897 if (!(instr->ClobbersRegisters() && instr->ClobbersDoubleRegisters())) { | 897 if (!(instr->ClobbersRegisters() && |
| 898 instr->ClobbersDoubleRegisters(isolate()))) { |
898 int fixed = 0; | 899 int fixed = 0; |
899 int used_at_start = 0; | 900 int used_at_start = 0; |
900 for (UseIterator it(instr); !it.Done(); it.Advance()) { | 901 for (UseIterator it(instr); !it.Done(); it.Advance()) { |
901 LUnallocated* operand = LUnallocated::cast(it.Current()); | 902 LUnallocated* operand = LUnallocated::cast(it.Current()); |
902 if (operand->IsUsedAtStart()) ++used_at_start; | 903 if (operand->IsUsedAtStart()) ++used_at_start; |
903 } | 904 } |
904 if (instr->Output() != NULL) { | 905 if (instr->Output() != NULL) { |
905 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; | 906 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; |
906 } | 907 } |
907 for (TempIterator it(instr); !it.Done(); it.Advance()) { | 908 for (TempIterator it(instr); !it.Done(); it.Advance()) { |
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2610 LOperand* index = UseTempRegister(instr->index()); | 2611 LOperand* index = UseTempRegister(instr->index()); |
2611 LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index); | 2612 LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index); |
2612 LInstruction* result = DefineSameAsFirst(load); | 2613 LInstruction* result = DefineSameAsFirst(load); |
2613 return AssignPointerMap(result); | 2614 return AssignPointerMap(result); |
2614 } | 2615 } |
2615 | 2616 |
2616 | 2617 |
2617 } } // namespace v8::internal | 2618 } } // namespace v8::internal |
2618 | 2619 |
2619 #endif // V8_TARGET_ARCH_X64 | 2620 #endif // V8_TARGET_ARCH_X64 |
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