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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 #include "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_X64 | 7 #if V8_TARGET_ARCH_X64 |
8 | 8 |
9 #include "src/base/bits.h" | 9 #include "src/base/bits.h" |
10 #include "src/base/division-by-constant.h" | 10 #include "src/base/division-by-constant.h" |
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2191 DCHECK(!src1.is(kScratchRegister)); | 2191 DCHECK(!src1.is(kScratchRegister)); |
2192 DCHECK(!src2.is(kScratchRegister)); | 2192 DCHECK(!src2.is(kScratchRegister)); |
2193 DCHECK(!dst.is(src1)); | 2193 DCHECK(!dst.is(src1)); |
2194 DCHECK(!dst.is(src2)); | 2194 DCHECK(!dst.is(src2)); |
2195 // Both operands must not be smis. | 2195 // Both operands must not be smis. |
2196 #ifdef DEBUG | 2196 #ifdef DEBUG |
2197 Condition not_both_smis = NegateCondition(CheckBothSmi(src1, src2)); | 2197 Condition not_both_smis = NegateCondition(CheckBothSmi(src1, src2)); |
2198 Check(not_both_smis, kBothRegistersWereSmisInSelectNonSmi); | 2198 Check(not_both_smis, kBothRegistersWereSmisInSelectNonSmi); |
2199 #endif | 2199 #endif |
2200 STATIC_ASSERT(kSmiTag == 0); | 2200 STATIC_ASSERT(kSmiTag == 0); |
2201 DCHECK_EQ(0, Smi::FromInt(0)); | 2201 DCHECK_EQ(static_cast<Smi*>(0), Smi::FromInt(0)); |
2202 movl(kScratchRegister, Immediate(kSmiTagMask)); | 2202 movl(kScratchRegister, Immediate(kSmiTagMask)); |
2203 andp(kScratchRegister, src1); | 2203 andp(kScratchRegister, src1); |
2204 testl(kScratchRegister, src2); | 2204 testl(kScratchRegister, src2); |
2205 // If non-zero then both are smis. | 2205 // If non-zero then both are smis. |
2206 j(not_zero, on_not_smis, near_jump); | 2206 j(not_zero, on_not_smis, near_jump); |
2207 | 2207 |
2208 // Exactly one operand is a smi. | 2208 // Exactly one operand is a smi. |
2209 DCHECK_EQ(1, static_cast<int>(kSmiTagMask)); | 2209 DCHECK_EQ(1, static_cast<int>(kSmiTagMask)); |
2210 // kScratchRegister still holds src1 & kSmiTag, which is either zero or one. | 2210 // kScratchRegister still holds src1 & kSmiTag, which is either zero or one. |
2211 subp(kScratchRegister, Immediate(1)); | 2211 subp(kScratchRegister, Immediate(1)); |
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5191 if (mag.shift > 0) sarl(rdx, Immediate(mag.shift)); | 5191 if (mag.shift > 0) sarl(rdx, Immediate(mag.shift)); |
5192 movl(rax, dividend); | 5192 movl(rax, dividend); |
5193 shrl(rax, Immediate(31)); | 5193 shrl(rax, Immediate(31)); |
5194 addl(rdx, rax); | 5194 addl(rdx, rax); |
5195 } | 5195 } |
5196 | 5196 |
5197 | 5197 |
5198 } } // namespace v8::internal | 5198 } } // namespace v8::internal |
5199 | 5199 |
5200 #endif // V8_TARGET_ARCH_X64 | 5200 #endif // V8_TARGET_ARCH_X64 |
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