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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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