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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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574 | 574 |
575 void MacroAssembler::DebugBreak() { | 575 void MacroAssembler::DebugBreak() { |
576 Move(eax, Immediate(0)); | 576 Move(eax, Immediate(0)); |
577 mov(ebx, Immediate(ExternalReference(Runtime::kHandleDebuggerStatement, | 577 mov(ebx, Immediate(ExternalReference(Runtime::kHandleDebuggerStatement, |
578 isolate()))); | 578 isolate()))); |
579 CEntryStub ces(isolate(), 1); | 579 CEntryStub ces(isolate(), 1); |
580 call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT); | 580 call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT); |
581 } | 581 } |
582 | 582 |
583 | 583 |
| 584 void MacroAssembler::Cvtsi2ss(XMMRegister dst, const Operand& src) { |
| 585 xorps(dst, dst); |
| 586 cvtsi2ss(dst, src); |
| 587 } |
| 588 |
| 589 |
584 void MacroAssembler::Cvtsi2sd(XMMRegister dst, const Operand& src) { | 590 void MacroAssembler::Cvtsi2sd(XMMRegister dst, const Operand& src) { |
585 xorps(dst, dst); | 591 xorps(dst, dst); |
586 cvtsi2sd(dst, src); | 592 cvtsi2sd(dst, src); |
587 } | 593 } |
588 | 594 |
589 | 595 |
| 596 void MacroAssembler::Roundss(XMMRegister dst, XMMRegister src, Register tmp, |
| 597 XMMRegister xtmp, RoundingMode mode) { |
| 598 if (CpuFeatures::IsSupported(SSE4_1)) { |
| 599 CpuFeatureScope sse_scope(this, SSE4_1); |
| 600 roundss(dst, src, mode); |
| 601 } else { |
| 602 // We have to store the original rounding mode to restore it later. |
| 603 { |
| 604 sub(esp, Immediate(kPointerSize * 2)); |
| 605 stmxcsr(Operand(esp, 0)); |
| 606 mov(tmp, Operand(esp, 0)); |
| 607 and_(tmp, Immediate(0xffff9fff)); |
| 608 or_(tmp, Immediate(mode << 13)); |
| 609 mov(Operand(esp, kPointerSize), tmp); |
| 610 ldmxcsr(Operand(esp, kPointerSize)); |
| 611 } |
| 612 |
| 613 // Do rounding by conversion to int. |
| 614 cvtss2si(tmp, src); |
| 615 |
| 616 Label out_of_range; |
| 617 Label done; |
| 618 // Check whether the input is within int32 range. |
| 619 cmp(tmp, Immediate(1)); |
| 620 j(overflow, &out_of_range); |
| 621 // Saving the sign bit. |
| 622 // Initialize xtmp with 0x80000000. |
| 623 pcmpeqd(xtmp, xtmp); |
| 624 pslld(xtmp, 31); |
| 625 andps(xtmp, src); |
| 626 // If the conversion results in INT_MIN, then the input is outside |
| 627 // int range, and due to the limited precision of float32 this means |
| 628 // that the input must have been an integer already. We are therefore |
| 629 // done already. |
| 630 cvtsi2ss(dst, tmp); |
| 631 // Restore the sign bit. |
| 632 orps(dst, xtmp); |
| 633 |
| 634 if (!dst.is(src)) { |
| 635 jmp(&done); |
| 636 } |
| 637 |
| 638 bind(&out_of_range); |
| 639 if (!dst.is(src)) { |
| 640 movss(dst, src); |
| 641 } |
| 642 |
| 643 bind(&done); |
| 644 // Restore the original rounding mode. |
| 645 ldmxcsr(Operand(esp, 0)); |
| 646 add(esp, Immediate(kPointerSize * 2)); |
| 647 } |
| 648 } |
| 649 |
| 650 |
| 651 void MacroAssembler::Roundsd(XMMRegister dst, XMMRegister src, Register tmp, |
| 652 XMMRegister xtmp, RoundingMode mode) { |
| 653 if (CpuFeatures::IsSupported(SSE4_1)) { |
| 654 CpuFeatureScope sse_scope(this, SSE4_1); |
| 655 roundsd(dst, src, mode); |
| 656 } else { |
| 657 // We have to store the original rounding mode to restore it later. |
| 658 { |
| 659 sub(esp, Immediate(kPointerSize * 2)); |
| 660 stmxcsr(Operand(esp, 0)); |
| 661 mov(tmp, Operand(esp, 0)); |
| 662 and_(tmp, Immediate(0xffff9fff)); |
| 663 or_(tmp, Immediate(mode << 13)); |
| 664 mov(Operand(esp, kPointerSize), tmp); |
| 665 ldmxcsr(Operand(esp, kPointerSize)); |
| 666 } |
| 667 |
| 668 // Convert the input to int32. |
| 669 cvtsd2si(tmp, src); |
| 670 |
| 671 Label out_of_range; |
| 672 Label done; |
| 673 // Check whether the input is within int32 range. |
| 674 cmp(tmp, Immediate(1)); |
| 675 j(overflow, &out_of_range); |
| 676 // Saving the sign bit. |
| 677 // Initialize xtmp with 0x8000000000000000. |
| 678 pcmpeqd(xtmp, xtmp); |
| 679 psllq(xtmp, 63); |
| 680 andpd(xtmp, src); |
| 681 // The input is within int32 range. We achieve rounding by converting |
| 682 // back to float. |
| 683 Cvtsi2sd(dst, tmp); |
| 684 // Restore the sign bit. |
| 685 orpd(dst, xtmp); |
| 686 jmp(&done); |
| 687 |
| 688 bind(&out_of_range); |
| 689 if (!dst.is(src)) { |
| 690 movsd(dst, src); |
| 691 } |
| 692 |
| 693 // xtmp=abs(src) |
| 694 pcmpeqd(xtmp, xtmp); |
| 695 psrlq(xtmp, 1); |
| 696 andpd(xtmp, src); |
| 697 |
| 698 // If abs(src) >= 2^52, then float64 precision guarantees that the input is |
| 699 // an integer already. |
| 700 ucomisd(xtmp, Operand::StaticVariable( |
| 701 ExternalReference::address_of_rounding_limit())); |
| 702 j(above_equal, &done); |
| 703 |
| 704 // If abs(src) != src, then src contains a negative number. For negative |
| 705 // numbers we calculate src - 2^52 + 2^52 instead of src + 2^52 - 2^52. |
| 706 ucomisd(xtmp, src); |
| 707 |
| 708 movsd(xtmp, Operand::StaticVariable( |
| 709 ExternalReference::address_of_rounding_limit())); |
| 710 |
| 711 Label below_zero; |
| 712 j(not_equal, &below_zero); |
| 713 |
| 714 addsd(dst, xtmp); |
| 715 subsd(dst, xtmp); |
| 716 jmp(&done); |
| 717 |
| 718 bind(&below_zero); |
| 719 subsd(dst, xtmp); |
| 720 addsd(dst, xtmp); |
| 721 |
| 722 bind(&done); |
| 723 // Restore the original rounding mode. |
| 724 ldmxcsr(Operand(esp, 0)); |
| 725 add(esp, Immediate(kPointerSize * 2)); |
| 726 } |
| 727 } |
| 728 |
| 729 |
590 bool MacroAssembler::IsUnsafeImmediate(const Immediate& x) { | 730 bool MacroAssembler::IsUnsafeImmediate(const Immediate& x) { |
591 static const int kMaxImmediateBits = 17; | 731 static const int kMaxImmediateBits = 17; |
592 if (!RelocInfo::IsNone(x.rmode_)) return false; | 732 if (!RelocInfo::IsNone(x.rmode_)) return false; |
593 return !is_intn(x.x_, kMaxImmediateBits); | 733 return !is_intn(x.x_, kMaxImmediateBits); |
594 } | 734 } |
595 | 735 |
596 | 736 |
597 void MacroAssembler::SafeMove(Register dst, const Immediate& x) { | 737 void MacroAssembler::SafeMove(Register dst, const Immediate& x) { |
598 if (IsUnsafeImmediate(x) && jit_cookie() != 0) { | 738 if (IsUnsafeImmediate(x) && jit_cookie() != 0) { |
599 Move(dst, Immediate(x.x_ ^ jit_cookie())); | 739 Move(dst, Immediate(x.x_ ^ jit_cookie())); |
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3116 mov(eax, dividend); | 3256 mov(eax, dividend); |
3117 shr(eax, 31); | 3257 shr(eax, 31); |
3118 add(edx, eax); | 3258 add(edx, eax); |
3119 } | 3259 } |
3120 | 3260 |
3121 | 3261 |
3122 } // namespace internal | 3262 } // namespace internal |
3123 } // namespace v8 | 3263 } // namespace v8 |
3124 | 3264 |
3125 #endif // V8_TARGET_ARCH_IA32 | 3265 #endif // V8_TARGET_ARCH_IA32 |
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