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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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697 // Make sure that the lithium instruction has either no fixed register | 697 // Make sure that the lithium instruction has either no fixed register |
698 // constraints in temps or the result OR no uses that are only used at | 698 // constraints in temps or the result OR no uses that are only used at |
699 // start. If this invariant doesn't hold, the register allocator can decide | 699 // start. If this invariant doesn't hold, the register allocator can decide |
700 // to insert a split of a range immediately before the instruction due to an | 700 // to insert a split of a range immediately before the instruction due to an |
701 // already allocated register needing to be used for the instruction's fixed | 701 // already allocated register needing to be used for the instruction's fixed |
702 // register constraint. In this case, the register allocator won't see an | 702 // register constraint. In this case, the register allocator won't see an |
703 // interference between the split child and the use-at-start (it would if | 703 // interference between the split child and the use-at-start (it would if |
704 // the it was just a plain use), so it is free to move the split child into | 704 // the it was just a plain use), so it is free to move the split child into |
705 // the same register that is used for the use-at-start. | 705 // the same register that is used for the use-at-start. |
706 // See https://code.google.com/p/chromium/issues/detail?id=201590 | 706 // See https://code.google.com/p/chromium/issues/detail?id=201590 |
707 if (!(instr->ClobbersRegisters() && instr->ClobbersDoubleRegisters())) { | 707 if (!(instr->ClobbersRegisters() && |
| 708 instr->ClobbersDoubleRegisters(isolate()))) { |
708 int fixed = 0; | 709 int fixed = 0; |
709 int used_at_start = 0; | 710 int used_at_start = 0; |
710 for (UseIterator it(instr); !it.Done(); it.Advance()) { | 711 for (UseIterator it(instr); !it.Done(); it.Advance()) { |
711 LUnallocated* operand = LUnallocated::cast(it.Current()); | 712 LUnallocated* operand = LUnallocated::cast(it.Current()); |
712 if (operand->IsUsedAtStart()) ++used_at_start; | 713 if (operand->IsUsedAtStart()) ++used_at_start; |
713 } | 714 } |
714 if (instr->Output() != NULL) { | 715 if (instr->Output() != NULL) { |
715 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; | 716 if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed; |
716 } | 717 } |
717 for (TempIterator it(instr); !it.Done(); it.Advance()) { | 718 for (TempIterator it(instr); !it.Done(); it.Advance()) { |
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2576 | 2577 |
2577 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) { | 2578 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) { |
2578 LOperand* receiver = UseRegister(instr->receiver()); | 2579 LOperand* receiver = UseRegister(instr->receiver()); |
2579 LOperand* function = UseRegister(instr->function()); | 2580 LOperand* function = UseRegister(instr->function()); |
2580 LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function); | 2581 LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function); |
2581 return AssignEnvironment(DefineAsRegister(result)); | 2582 return AssignEnvironment(DefineAsRegister(result)); |
2582 } | 2583 } |
2583 | 2584 |
2584 | 2585 |
2585 } } // namespace v8::internal | 2586 } } // namespace v8::internal |
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