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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 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #if V8_TARGET_ARCH_IA32 | 5 #if V8_TARGET_ARCH_IA32 |
6 | 6 |
7 #include "src/base/bits.h" | 7 #include "src/base/bits.h" |
8 #include "src/base/division-by-constant.h" | 8 #include "src/base/division-by-constant.h" |
9 #include "src/bootstrapper.h" | 9 #include "src/bootstrapper.h" |
10 #include "src/codegen.h" | 10 #include "src/codegen.h" |
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2557 mov(scratch2, FieldOperand(object2, HeapObject::kMapOffset)); | 2557 mov(scratch2, FieldOperand(object2, HeapObject::kMapOffset)); |
2558 movzx_b(scratch1, FieldOperand(scratch1, Map::kInstanceTypeOffset)); | 2558 movzx_b(scratch1, FieldOperand(scratch1, Map::kInstanceTypeOffset)); |
2559 movzx_b(scratch2, FieldOperand(scratch2, Map::kInstanceTypeOffset)); | 2559 movzx_b(scratch2, FieldOperand(scratch2, Map::kInstanceTypeOffset)); |
2560 | 2560 |
2561 // Check that both are flat one-byte strings. | 2561 // Check that both are flat one-byte strings. |
2562 const int kFlatOneByteStringMask = | 2562 const int kFlatOneByteStringMask = |
2563 kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask; | 2563 kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask; |
2564 const int kFlatOneByteStringTag = | 2564 const int kFlatOneByteStringTag = |
2565 kStringTag | kOneByteStringTag | kSeqStringTag; | 2565 kStringTag | kOneByteStringTag | kSeqStringTag; |
2566 // Interleave bits from both instance types and compare them in one check. | 2566 // Interleave bits from both instance types and compare them in one check. |
2567 const int kShift = 8; | 2567 DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << 3)); |
2568 DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << kShift)); | |
2569 and_(scratch1, kFlatOneByteStringMask); | 2568 and_(scratch1, kFlatOneByteStringMask); |
2570 and_(scratch2, kFlatOneByteStringMask); | 2569 and_(scratch2, kFlatOneByteStringMask); |
2571 shl(scratch2, kShift); | 2570 lea(scratch1, Operand(scratch1, scratch2, times_8, 0)); |
2572 or_(scratch1, scratch2); | 2571 cmp(scratch1, kFlatOneByteStringTag | (kFlatOneByteStringTag << 3)); |
2573 cmp(scratch1, kFlatOneByteStringTag | (kFlatOneByteStringTag << kShift)); | |
2574 j(not_equal, failure); | 2572 j(not_equal, failure); |
2575 } | 2573 } |
2576 | 2574 |
2577 | 2575 |
2578 void MacroAssembler::JumpIfNotUniqueNameInstanceType(Operand operand, | 2576 void MacroAssembler::JumpIfNotUniqueNameInstanceType(Operand operand, |
2579 Label* not_unique_name, | 2577 Label* not_unique_name, |
2580 Label::Distance distance) { | 2578 Label::Distance distance) { |
2581 STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0); | 2579 STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0); |
2582 Label succeed; | 2580 Label succeed; |
2583 test(operand, Immediate(kIsNotStringMask | kIsNotInternalizedMask)); | 2581 test(operand, Immediate(kIsNotStringMask | kIsNotInternalizedMask)); |
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2947 mov(eax, dividend); | 2945 mov(eax, dividend); |
2948 shr(eax, 31); | 2946 shr(eax, 31); |
2949 add(edx, eax); | 2947 add(edx, eax); |
2950 } | 2948 } |
2951 | 2949 |
2952 | 2950 |
2953 } // namespace internal | 2951 } // namespace internal |
2954 } // namespace v8 | 2952 } // namespace v8 |
2955 | 2953 |
2956 #endif // V8_TARGET_ARCH_IA32 | 2954 #endif // V8_TARGET_ARCH_IA32 |
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