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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_IA32 | 7 #if V8_TARGET_ARCH_IA32 |
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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2459 punpckldq(dst, xmm0); | 2459 punpckldq(dst, xmm0); |
2460 } else { | 2460 } else { |
2461 DCHECK_EQ(0, imm8); | 2461 DCHECK_EQ(0, imm8); |
2462 psrlq(dst, 32); | 2462 psrlq(dst, 32); |
2463 punpckldq(xmm0, dst); | 2463 punpckldq(xmm0, dst); |
2464 movaps(dst, xmm0); | 2464 movaps(dst, xmm0); |
2465 } | 2465 } |
2466 } | 2466 } |
2467 | 2467 |
2468 | 2468 |
| 2469 void MacroAssembler::Lzcnt(Register dst, const Operand& src) { |
| 2470 // TODO(intel): Add support for LZCNT (with ABM/BMI1). |
| 2471 Label not_zero_src; |
| 2472 bsr(dst, src); |
| 2473 j(not_zero, ¬_zero_src, Label::kNear); |
| 2474 Move(dst, Immediate(63)); // 63^31 == 32 |
| 2475 bind(¬_zero_src); |
| 2476 xor_(dst, Immediate(31)); // for x in [0..31], 31^x == 31-x. |
| 2477 } |
| 2478 |
| 2479 |
2469 void MacroAssembler::SetCounter(StatsCounter* counter, int value) { | 2480 void MacroAssembler::SetCounter(StatsCounter* counter, int value) { |
2470 if (FLAG_native_code_counters && counter->Enabled()) { | 2481 if (FLAG_native_code_counters && counter->Enabled()) { |
2471 mov(Operand::StaticVariable(ExternalReference(counter)), Immediate(value)); | 2482 mov(Operand::StaticVariable(ExternalReference(counter)), Immediate(value)); |
2472 } | 2483 } |
2473 } | 2484 } |
2474 | 2485 |
2475 | 2486 |
2476 void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) { | 2487 void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) { |
2477 DCHECK(value > 0); | 2488 DCHECK(value > 0); |
2478 if (FLAG_native_code_counters && counter->Enabled()) { | 2489 if (FLAG_native_code_counters && counter->Enabled()) { |
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3225 if (mag.shift > 0) sar(edx, mag.shift); | 3236 if (mag.shift > 0) sar(edx, mag.shift); |
3226 mov(eax, dividend); | 3237 mov(eax, dividend); |
3227 shr(eax, 31); | 3238 shr(eax, 31); |
3228 add(edx, eax); | 3239 add(edx, eax); |
3229 } | 3240 } |
3230 | 3241 |
3231 | 3242 |
3232 } } // namespace v8::internal | 3243 } } // namespace v8::internal |
3233 | 3244 |
3234 #endif // V8_TARGET_ARCH_IA32 | 3245 #endif // V8_TARGET_ARCH_IA32 |
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