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Issue 23496017: Shr should save its Use truncating flag before Canonicalize (Closed) Base URL: https://github.com/v8/v8.git@master
Patch Set: Created 7 years, 3 months ago
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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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785 } else { 785 } else {
786 right = UseFixed(right_value, ecx); 786 right = UseFixed(right_value, ecx);
787 } 787 }
788 788
789 // Shift operations can only deoptimize if we do a logical shift by 0 and 789 // Shift operations can only deoptimize if we do a logical shift by 0 and
790 // the result cannot be truncated to int32. 790 // the result cannot be truncated to int32.
791 if (op == Token::SHR && constant_value == 0) { 791 if (op == Token::SHR && constant_value == 0) {
792 if (FLAG_opt_safe_uint32_operations) { 792 if (FLAG_opt_safe_uint32_operations) {
793 does_deopt = !instr->CheckFlag(HInstruction::kUint32); 793 does_deopt = !instr->CheckFlag(HInstruction::kUint32);
794 } else { 794 } else {
795 does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToInt32); 795 does_deopt = !instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32);
796 } 796 }
797 } 797 }
798 798
799 LInstruction* result = 799 LInstruction* result =
800 DefineSameAsFirst(new(zone()) LShiftI(op, left, right, does_deopt)); 800 DefineSameAsFirst(new(zone()) LShiftI(op, left, right, does_deopt));
801 return does_deopt ? AssignEnvironment(result) : result; 801 return does_deopt ? AssignEnvironment(result) : result;
802 } 802 }
803 803
804 804
805 LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op, 805 LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
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2722 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) { 2722 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
2723 LOperand* object = UseRegister(instr->object()); 2723 LOperand* object = UseRegister(instr->object());
2724 LOperand* index = UseTempRegister(instr->index()); 2724 LOperand* index = UseTempRegister(instr->index());
2725 return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index)); 2725 return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
2726 } 2726 }
2727 2727
2728 2728
2729 } } // namespace v8::internal 2729 } } // namespace v8::internal
2730 2730
2731 #endif // V8_TARGET_ARCH_IA32 2731 #endif // V8_TARGET_ARCH_IA32
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