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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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1675 return NULL; | 1675 return NULL; |
1676 } | 1676 } |
1677 | 1677 |
1678 | 1678 |
1679 LInstruction* LChunkBuilder::DoChange(HChange* instr) { | 1679 LInstruction* LChunkBuilder::DoChange(HChange* instr) { |
1680 Representation from = instr->from(); | 1680 Representation from = instr->from(); |
1681 Representation to = instr->to(); | 1681 Representation to = instr->to(); |
1682 if (from.IsTagged()) { | 1682 if (from.IsTagged()) { |
1683 if (to.IsDouble()) { | 1683 if (to.IsDouble()) { |
1684 LOperand* value = UseRegister(instr->value()); | 1684 LOperand* value = UseRegister(instr->value()); |
1685 LNumberUntagD* res = new(zone()) LNumberUntagD(value); | 1685 // Temp register only necessary for minus zero check. |
| 1686 LOperand* temp = instr->deoptimize_on_minus_zero() |
| 1687 ? TempRegister() |
| 1688 : NULL; |
| 1689 LNumberUntagD* res = new(zone()) LNumberUntagD(value, temp); |
1686 return AssignEnvironment(DefineAsRegister(res)); | 1690 return AssignEnvironment(DefineAsRegister(res)); |
1687 } else { | 1691 } else { |
1688 ASSERT(to.IsInteger32()); | 1692 ASSERT(to.IsInteger32()); |
1689 LOperand* value = UseRegister(instr->value()); | 1693 LOperand* value = UseRegister(instr->value()); |
1690 bool needs_check = !instr->value()->type().IsSmi(); | 1694 bool needs_check = !instr->value()->type().IsSmi(); |
1691 if (needs_check) { | 1695 if (needs_check) { |
1692 bool truncating = instr->CanTruncateToInt32(); | 1696 bool truncating = instr->CanTruncateToInt32(); |
1693 LOperand* xmm_temp = | 1697 LOperand* xmm_temp = |
1694 (truncating && CpuFeatures::IsSupported(SSE3)) | 1698 (truncating && CpuFeatures::IsSupported(SSE3)) |
1695 ? NULL | 1699 ? NULL |
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2397 LOperand* key = UseOrConstantAtStart(instr->key()); | 2401 LOperand* key = UseOrConstantAtStart(instr->key()); |
2398 LOperand* object = UseOrConstantAtStart(instr->object()); | 2402 LOperand* object = UseOrConstantAtStart(instr->object()); |
2399 LIn* result = new(zone()) LIn(context, key, object); | 2403 LIn* result = new(zone()) LIn(context, key, object); |
2400 return MarkAsCall(DefineFixed(result, eax), instr); | 2404 return MarkAsCall(DefineFixed(result, eax), instr); |
2401 } | 2405 } |
2402 | 2406 |
2403 | 2407 |
2404 } } // namespace v8::internal | 2408 } } // namespace v8::internal |
2405 | 2409 |
2406 #endif // V8_TARGET_ARCH_IA32 | 2410 #endif // V8_TARGET_ARCH_IA32 |
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