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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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781 HValue* HConstant::Canonicalize() { | 781 HValue* HConstant::Canonicalize() { |
782 return HasNoUses() && !IsBlockEntry() ? NULL : this; | 782 return HasNoUses() && !IsBlockEntry() ? NULL : this; |
783 } | 783 } |
784 | 784 |
785 | 785 |
786 HValue* HTypeof::Canonicalize() { | 786 HValue* HTypeof::Canonicalize() { |
787 return HasNoUses() && !IsBlockEntry() ? NULL : this; | 787 return HasNoUses() && !IsBlockEntry() ? NULL : this; |
788 } | 788 } |
789 | 789 |
790 | 790 |
791 HValue* HBitwise::Canonicalize() { | |
792 if (!representation().IsInteger32()) return this; | |
793 if (op() == Token::BIT_XOR) return this; | |
Sven Panne
2012/01/11 09:54:03
I don't think we need this special case, because '
fschneider
2012/01/11 10:00:30
Done.
| |
794 // If x is an int32, x & -1 == x and x | 0 == x. | |
795 int nop_constant = (op() == Token::BIT_AND) ? -1 : 0; | |
Sven Panne
2012/01/11 09:54:03
Use int32_t, not int.
fschneider
2012/01/11 10:00:30
Done.
| |
796 if (left()->IsConstant() && | |
797 HConstant::cast(left())->HasInteger32Value() && | |
798 HConstant::cast(left())->Integer32Value() == nop_constant) { | |
799 return right(); | |
800 } | |
801 if (right()->IsConstant() && | |
802 HConstant::cast(right())->HasInteger32Value() && | |
803 HConstant::cast(right())->Integer32Value() == nop_constant) { | |
804 return left(); | |
805 } | |
806 return this; | |
807 } | |
808 | |
809 | |
791 void HTypeof::PrintDataTo(StringStream* stream) { | 810 void HTypeof::PrintDataTo(StringStream* stream) { |
792 value()->PrintNameTo(stream); | 811 value()->PrintNameTo(stream); |
793 } | 812 } |
794 | 813 |
795 | 814 |
796 void HChange::PrintDataTo(StringStream* stream) { | 815 void HChange::PrintDataTo(StringStream* stream) { |
797 HUnaryOperation::PrintDataTo(stream); | 816 HUnaryOperation::PrintDataTo(stream); |
798 stream->Add(" %s to %s", from().Mnemonic(), to().Mnemonic()); | 817 stream->Add(" %s to %s", from().Mnemonic(), to().Mnemonic()); |
799 | 818 |
800 if (CanTruncateToInt32()) stream->Add(" truncating-int32"); | 819 if (CanTruncateToInt32()) stream->Add(" truncating-int32"); |
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2106 | 2125 |
2107 | 2126 |
2108 void HCheckPrototypeMaps::Verify() { | 2127 void HCheckPrototypeMaps::Verify() { |
2109 HInstruction::Verify(); | 2128 HInstruction::Verify(); |
2110 ASSERT(HasNoUses()); | 2129 ASSERT(HasNoUses()); |
2111 } | 2130 } |
2112 | 2131 |
2113 #endif | 2132 #endif |
2114 | 2133 |
2115 } } // namespace v8::internal | 2134 } } // namespace v8::internal |
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