/*
 * Copyright (C) 2008-2022 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#pragma once

#if ENABLE(ASSEMBLER) && CPU(X86_64)

#include "MacroAssemblerX86Common.h"

#define REPATCH_OFFSET_CALL_R11 3

inline bool CAN_SIGN_EXTEND_32_64(int64_t value) { return value == (int64_t)(int32_t)value; }

namespace JSC {

class MacroAssemblerX86_64 : public MacroAssemblerX86Common {
public:
    static constexpr unsigned numGPRs = 16;
    static constexpr unsigned numFPRs = 16;
    
    static constexpr RegisterID InvalidGPRReg = X86Registers::InvalidGPRReg;

    using MacroAssemblerX86Common::add32;
    using MacroAssemblerX86Common::and32;
    using MacroAssemblerX86Common::branch32;
    using MacroAssemblerX86Common::branchAdd32;
    using MacroAssemblerX86Common::or32;
    using MacroAssemblerX86Common::or16;
    using MacroAssemblerX86Common::or8;
    using MacroAssemblerX86Common::sub32;
    using MacroAssemblerX86Common::load8;
    using MacroAssemblerX86Common::load32;
    using MacroAssemblerX86Common::store32;
    using MacroAssemblerX86Common::store8;
    using MacroAssemblerX86Common::call;
    using MacroAssemblerX86Common::jump;
    using MacroAssemblerX86Common::farJump;
    using MacroAssemblerX86Common::addDouble;
    using MacroAssemblerX86Common::loadDouble;
    using MacroAssemblerX86Common::convertInt32ToDouble;

    void add32(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        add32(imm, Address(scratchRegister()));
    }
    
    void and32(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        and32(imm, Address(scratchRegister()));
    }
    
    void add32(AbsoluteAddress address, RegisterID dest)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        add32(Address(scratchRegister()), dest);
    }
    
    void or32(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        or32(imm, Address(scratchRegister()));
    }

    void or32(RegisterID reg, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        or32(reg, Address(scratchRegister()));
    }

    void or16(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        or16(imm, Address(scratchRegister()));
    }

    void sub32(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        sub32(imm, Address(scratchRegister()));
    }
    
    void load8(const void* address, RegisterID dest)
    {
        move(TrustedImmPtr(address), dest);
        load8(Address(dest), dest);
    }

    void load16(ExtendedAddress address, RegisterID dest)
    {
        TrustedImmPtr addr(reinterpret_cast<void*>(address.offset));
        MacroAssemblerX86Common::move(addr, scratchRegister());
        MacroAssemblerX86Common::load16(BaseIndex(scratchRegister(), address.base, TimesTwo), dest);
    }

    void load16(BaseIndex address, RegisterID dest)
    {
        MacroAssemblerX86Common::load16(address, dest);
    }

    void load16(Address address, RegisterID dest)
    {
        MacroAssemblerX86Common::load16(address, dest);
    }

    void load32(const void* address, RegisterID dest)
    {
        if (dest == X86Registers::eax)
            m_assembler.movl_mEAX(address);
        else {
            move(TrustedImmPtr(address), dest);
            load32(Address(dest), dest);
        }
    }

    void clearSIMDStatus()
    {
        if (supportsAVX())
            m_assembler.vzeroupper();
    }

    void addDouble(AbsoluteAddress address, FPRegisterID dest)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        if (supportsAVX())
            m_assembler.vaddsd_mrr(0, scratchRegister(), dest, dest);
        else
            m_assembler.addsd_mr(0, scratchRegister(), dest);
    }

    void convertInt32ToDouble(TrustedImm32 imm, FPRegisterID dest)
    {
        move(imm, scratchRegister());
        if (supportsAVX())
            m_assembler.vcvtsi2sd_rrr(scratchRegister(), dest, dest);
        else
            m_assembler.cvtsi2sd_rr(scratchRegister(), dest);
    }

    void store32(TrustedImm32 imm, void* address)
    {
        move(TrustedImmPtr(address), scratchRegister());
        store32(imm, Address(scratchRegister()));
    }

    void store32(RegisterID source, void* address)
    {
        if (source == X86Registers::eax)
            m_assembler.movl_EAXm(address);
        else {
            move(TrustedImmPtr(address), scratchRegister());
            store32(source, Address(scratchRegister()));
        }
    }
    
    void store8(TrustedImm32 imm, void* address)
    {
        TrustedImm32 imm8(static_cast<int8_t>(imm.m_value));
        move(TrustedImmPtr(address), scratchRegister());
        store8(imm8, Address(scratchRegister()));
    }

    void store8(RegisterID reg, void* address)
    {
        move(TrustedImmPtr(address), scratchRegister());
        store8(reg, Address(scratchRegister()));
    }

#if OS(WINDOWS)
    Call callWithSlowPathReturnType(PtrTag)
    {
        // On Win64, when the return type is larger than 8 bytes, we need to allocate space on the stack for the return value.
        // On entry, rcx should contain a pointer to this stack space. The other parameters are shifted to the right,
        // rdx should contain the first argument, r8 should contain the second argument, and r9 should contain the third argument.
        // On return, rax contains a pointer to this stack value. See http://msdn.microsoft.com/en-us/library/7572ztz4.aspx.
        // We then need to copy the 16 byte return value into rax and rdx, since JIT expects the return value to be split between the two.
        // It is assumed that the parameters are already shifted to the right, when entering this method.
        // Note: this implementation supports up to 3 parameters.

        // JIT relies on the CallerFrame (frame pointer) being put on the stack,
        // On Win64 we need to manually copy the frame pointer to the stack, since MSVC may not maintain a frame pointer on 64-bit.
        // See http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx where it's stated that rbp MAY be used as a frame pointer.
        store64(X86Registers::ebp, Address(X86Registers::esp, -16));

        // We also need to allocate the shadow space on the stack for the 4 parameter registers.
        // In addition, we need to allocate 16 bytes for the return value.
        // Also, we should allocate 16 bytes for the frame pointer, and return address (not populated).
        sub64(TrustedImm32(8 * sizeof(int64_t)), X86Registers::esp);

        // The first parameter register should contain a pointer to the stack allocated space for the return value.
        move(X86Registers::esp, X86Registers::ecx);
        add64(TrustedImm32(4 * sizeof(int64_t)), X86Registers::ecx);

        DataLabelPtr label = moveWithPatch(TrustedImmPtr(nullptr), scratchRegister());
        Call result = Call(m_assembler.call(scratchRegister()), Call::Linkable);

        add64(TrustedImm32(8 * sizeof(int64_t)), X86Registers::esp);

        // Copy the return value into rax and rdx.
        load64(Address(X86Registers::eax, sizeof(int64_t)), X86Registers::edx);
        load64(Address(X86Registers::eax), X86Registers::eax);

        ASSERT_UNUSED(label, differenceBetween(label, result) == REPATCH_OFFSET_CALL_R11);
        return result;
    }
#endif

    Call call(PtrTag)
    {
#if OS(WINDOWS)
        // JIT relies on the CallerFrame (frame pointer) being put on the stack,
        // On Win64 we need to manually copy the frame pointer to the stack, since MSVC may not maintain a frame pointer on 64-bit.
        // See http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx where it's stated that rbp MAY be used as a frame pointer.
        store64(X86Registers::ebp, Address(X86Registers::esp, -16));

        // On Windows we need to copy the arguments that don't fit in registers to the stack location where the callee expects to find them.
        // We don't know the number of arguments at this point, so the arguments (5, 6, ...) should always be copied.

        // Copy argument 5
        load64(Address(X86Registers::esp, 4 * sizeof(int64_t)), scratchRegister());
        store64(scratchRegister(), Address(X86Registers::esp, -4 * static_cast<int32_t>(sizeof(int64_t))));

        // Copy argument 6
        load64(Address(X86Registers::esp, 5 * sizeof(int64_t)), scratchRegister());
        store64(scratchRegister(), Address(X86Registers::esp, -3 * static_cast<int32_t>(sizeof(int64_t))));

        // We also need to allocate the shadow space on the stack for the 4 parameter registers.
        // Also, we should allocate 16 bytes for the frame pointer, and return address (not populated).
        // In addition, we need to allocate 16 bytes for two more parameters, since the call can have up to 6 parameters.
        sub64(TrustedImm32(8 * sizeof(int64_t)), X86Registers::esp);
#endif
        DataLabelPtr label = moveWithPatch(TrustedImmPtr(nullptr), scratchRegister());
        Call result = Call(m_assembler.call(scratchRegister()), Call::Linkable);
#if OS(WINDOWS)
        add64(TrustedImm32(8 * sizeof(int64_t)), X86Registers::esp);
#endif
        ASSERT_UNUSED(label, differenceBetween(label, result) == REPATCH_OFFSET_CALL_R11);
        return result;
    }

    void callOperation(const CodePtr<OperationPtrTag> operation)
    {
        move(TrustedImmPtr(operation.taggedPtr()), scratchRegister());
        m_assembler.call(scratchRegister());
    }

    ALWAYS_INLINE Call call(RegisterID callTag) { return UNUSED_PARAM(callTag), call(NoPtrTag); }

    // Address is a memory location containing the address to jump to
    void farJump(AbsoluteAddress address, PtrTag tag)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        farJump(Address(scratchRegister()), tag);
    }

    ALWAYS_INLINE void farJump(AbsoluteAddress address, RegisterID jumpTag) { UNUSED_PARAM(jumpTag), farJump(address, NoPtrTag); }

    Call threadSafePatchableNearCall()
    {
        padBeforePatch();
        const size_t nearCallOpcodeSize = 1;
        const size_t nearCallRelativeLocationSize = sizeof(int32_t);
        // We want to make sure the 32-bit near call immediate is 32-bit aligned.
        size_t codeSize = m_assembler.codeSize();
        size_t alignedSize = WTF::roundUpToMultipleOf<nearCallRelativeLocationSize>(codeSize + nearCallOpcodeSize);
        emitNops(alignedSize - (codeSize + nearCallOpcodeSize));
        DataLabelPtr label = DataLabelPtr(this);
        Call result = nearCall();
        ASSERT_UNUSED(label, differenceBetween(label, result) == (nearCallOpcodeSize + nearCallRelativeLocationSize));
        return result;
    }

    Call threadSafePatchableNearTailCall()
    {
        const size_t nearCallOpcodeSize = 1;
        const size_t nearCallRelativeLocationSize = sizeof(int32_t);
        // We want to make sure the 32-bit near call immediate is 32-bit aligned.
        size_t codeSize = m_assembler.codeSize();
        size_t alignedSize = WTF::roundUpToMultipleOf<nearCallRelativeLocationSize>(codeSize + nearCallOpcodeSize);
        emitNops(alignedSize - (codeSize + nearCallOpcodeSize));
        DataLabelPtr label = DataLabelPtr(this);
        Call result = nearTailCall();
        ASSERT_UNUSED(label, differenceBetween(label, result) == (nearCallOpcodeSize + nearCallRelativeLocationSize));
        return result;
    }

    Jump branchAdd32(ResultCondition cond, TrustedImm32 src, AbsoluteAddress dest)
    {
        move(TrustedImmPtr(dest.m_ptr), scratchRegister());
        add32(src, Address(scratchRegister()));
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    void add64(RegisterID src, RegisterID dest)
    {
        m_assembler.addq_rr(src, dest);
    }
    
    void add64(Address src, RegisterID dest)
    {
        m_assembler.addq_mr(src.offset, src.base, dest);
    }

    void add64(BaseIndex src, RegisterID dest)
    {
        m_assembler.addq_mr(src.offset, src.base, src.index, src.scale, dest);
    }

    void add64(RegisterID src, Address dest)
    {
        m_assembler.addq_rm(src, dest.offset, dest.base);
    }

    void add64(RegisterID src, BaseIndex dest)
    {
        m_assembler.addq_rm(src, dest.offset, dest.base, dest.index, dest.scale);
    }

    void add64(AbsoluteAddress src, RegisterID dest)
    {
        move(TrustedImmPtr(src.m_ptr), scratchRegister());
        add64(Address(scratchRegister()), dest);
    }

    void add64(TrustedImm32 imm, RegisterID srcDest)
    {
        if (imm.m_value == 1)
            m_assembler.incq_r(srcDest);
        else
            m_assembler.addq_ir(imm.m_value, srcDest);
    }

    void add64(TrustedImm64 imm, RegisterID dest)
    {
        if (imm.m_value == 1)
            m_assembler.incq_r(dest);
        else {
            move(imm, scratchRegister());
            add64(scratchRegister(), dest);
        }
    }

    void add64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        m_assembler.leaq_mr(imm.m_value, src, dest);
    }

    void add64(TrustedImm32 imm, Address address)
    {
        if (imm.m_value == 1)
            m_assembler.incq_m(address.offset, address.base);
        else
            m_assembler.addq_im(imm.m_value, address.offset, address.base);
    }

    void add64(TrustedImm32 imm, BaseIndex address)
    {
        if (imm.m_value == 1)
            m_assembler.incq_m(address.offset, address.base, address.index, address.scale);
        else
            m_assembler.addq_im(imm.m_value, address.offset, address.base, address.index, address.scale);
    }

    void add64(TrustedImm32 imm, AbsoluteAddress address)
    {
        move(TrustedImmPtr(address.m_ptr), scratchRegister());
        add64(imm, Address(scratchRegister()));
    }

    void add64(RegisterID a, RegisterID b, RegisterID dest)
    {
        x86Lea64(BaseIndex(a, b, TimesOne), dest);
    }

    void x86Lea64(BaseIndex index, RegisterID dest)
    {
        if (!index.scale && !index.offset) {
            if (index.base == dest) {
                add64(index.index, dest);
                return;
            }
            if (index.index == dest) {
                add64(index.base, dest);
                return;
            }
        }
        m_assembler.leaq_mr(index.offset, index.base, index.index, index.scale, dest);
    }

    void getEffectiveAddress(BaseIndex address, RegisterID dest)
    {
        return x86Lea64(address, dest);
    }

    void addPtrNoFlags(TrustedImm32 imm, RegisterID srcDest)
    {
        m_assembler.leaq_mr(imm.m_value, srcDest, srcDest);
    }

    void and64(RegisterID src, RegisterID dest)
    {
        m_assembler.andq_rr(src, dest);
    }

    void and64(RegisterID src, Address dest)
    {
        m_assembler.andq_rm(src, dest.offset, dest.base);
    }

    void and64(RegisterID src, BaseIndex dest)
    {
        m_assembler.andq_rm(src, dest.offset, dest.base, dest.index, dest.scale);
    }

    void and64(Address src, RegisterID dest)
    {
        m_assembler.andq_mr(src.offset, src.base, dest);
    }

    void and64(BaseIndex src, RegisterID dest)
    {
        m_assembler.andq_mr(src.offset, src.base, src.index, src.scale, dest);
    }

    void and64(TrustedImm32 imm, RegisterID srcDest)
    {
        m_assembler.andq_ir(imm.m_value, srcDest);
    }

    void and64(TrustedImm32 imm, Address dest)
    {
        m_assembler.andq_im(imm.m_value, dest.offset, dest.base);
    }

    void and64(TrustedImm32 imm, BaseIndex dest)
    {
        m_assembler.andq_im(imm.m_value, dest.offset, dest.base, dest.index, dest.scale);
    }

    void and64(TrustedImmPtr imm, RegisterID srcDest)
    {
        static_assert(sizeof(void*) == sizeof(int64_t));
        and64(TrustedImm64(bitwise_cast<int64_t>(imm.m_value)), srcDest);
    }

    void and64(TrustedImm64 imm, RegisterID srcDest)
    {
        int64_t intValue = imm.m_value;
        if (intValue <= std::numeric_limits<int32_t>::max()
            && intValue >= std::numeric_limits<int32_t>::min()) {
            and64(TrustedImm32(static_cast<int32_t>(intValue)), srcDest);
            return;
        }
        move(imm, scratchRegister());
        and64(scratchRegister(), srcDest);
    }

    void and64(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        if (op1 == op2 && op1 != dest && op2 != dest)
            move(op1, dest);
        else if (op1 == dest)
            and64(op2, dest);
        else {
            move(op2, dest);
            and64(op1, dest);
        }
    }

    void countLeadingZeros64(RegisterID src, RegisterID dst)
    {
        if (supportsLZCNT()) {
            m_assembler.lzcntq_rr(src, dst);
            return;
        }
        m_assembler.bsrq_rr(src, dst);
        clz64AfterBsr(dst);
    }

    void countLeadingZeros64(Address src, RegisterID dst)
    {
        if (supportsLZCNT()) {
            m_assembler.lzcntq_mr(src.offset, src.base, dst);
            return;
        }
        m_assembler.bsrq_mr(src.offset, src.base, dst);
        clz64AfterBsr(dst);
    }

    void countTrailingZeros64(RegisterID src, RegisterID dst)
    {
        if (supportsBMI1()) {
            m_assembler.tzcntq_rr(src, dst);
            return;
        }
        m_assembler.bsfq_rr(src, dst);
        ctzAfterBsf<64>(dst);
    }

    void countTrailingZeros64WithoutNullCheck(RegisterID src, RegisterID dst)
    {
#if ASSERT_ENABLED
        Jump notZero = branchTest64(NonZero, src);
        abortWithReason(MacroAssemblerOops, __LINE__);
        notZero.link(this);
#endif
        if (supportsBMI1()) {
            m_assembler.tzcntq_rr(src, dst);
            return;
        }
        m_assembler.bsfq_rr(src, dst);
    }

    void clearBit64(RegisterID bitToClear, RegisterID dst, RegisterID = InvalidGPRReg)
    {
        m_assembler.btrq_rr(dst, bitToClear);
    }

    enum class ClearBitsAttributes {
        OKToClobberMask,
        MustPreserveMask
    };

    void clearBits64WithMask(RegisterID mask, RegisterID dest, ClearBitsAttributes maskPreservation = ClearBitsAttributes::OKToClobberMask)
    {
        not64(mask);
        m_assembler.andq_rr(mask, dest);
        if (maskPreservation == ClearBitsAttributes::MustPreserveMask)
            not64(mask);
    }

    void clearBits64WithMask(RegisterID src, RegisterID mask, RegisterID dest, ClearBitsAttributes maskPreservation = ClearBitsAttributes::OKToClobberMask)
    {
        move(src, dest);
        clearBits64WithMask(mask, dest, maskPreservation);
    }

    void countPopulation64(RegisterID src, RegisterID dst)
    {
        ASSERT(supportsCountPopulation());
        m_assembler.popcntq_rr(src, dst);
    }

    void countPopulation64(Address src, RegisterID dst)
    {
        ASSERT(supportsCountPopulation());
        m_assembler.popcntq_mr(src.offset, src.base, dst);
    }

    void lshift64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.shlq_i8r(imm.m_value, dest);
    }
    
    void lshift64(RegisterID src, RegisterID dest)
    {
        if (src == X86Registers::ecx)
            m_assembler.shlq_CLr(dest);
        else {
            ASSERT(src != dest);

            // Can only shift by ecx, so we do some swapping if we see anything else.
            swap(src, X86Registers::ecx);
            m_assembler.shlq_CLr(dest == X86Registers::ecx ? src : dest);
            swap(src, X86Registers::ecx);
        }
    }

    void lshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        if (src == dest)
            lshift64(imm, src);
        else {
            move(src, dest);
            lshift64(imm, dest);
        }
    }

    void lshift64(Address src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            load64(src, dest);
            lshift64(scratchRegister(), dest);
        } else {
            load64(src, dest);
            lshift64(shiftAmount, dest);
        }
    }

    void lshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            move(src, dest);
            lshift64(scratchRegister(), dest);
        } else {
            move(src, dest);
            lshift64(shiftAmount, dest);
        }
    }

    void rshift64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.sarq_i8r(imm.m_value, dest);
    }

    void rshift64(RegisterID src, RegisterID dest)
    {
        if (src == X86Registers::ecx)
            m_assembler.sarq_CLr(dest);
        else {
            ASSERT(src != dest);
            
            // Can only shift by ecx, so we do some swapping if we see anything else.
            swap(src, X86Registers::ecx);
            m_assembler.sarq_CLr(dest == X86Registers::ecx ? src : dest);
            swap(src, X86Registers::ecx);
        }
    }

    void rshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        move(src, dest);
        rshift64(imm, dest);
    }

    void rshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            move(src, dest);
            rshift64(scratchRegister(), dest);
        } else {
            move(src, dest);
            rshift64(shiftAmount, dest);
        }
    }

    void urshift64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.shrq_i8r(imm.m_value, dest);
    }

    void urshift64(RegisterID src, RegisterID dest)
    {
        if (src == X86Registers::ecx)
            m_assembler.shrq_CLr(dest);
        else {
            ASSERT(src != dest);
            
            // Can only shift by ecx, so we do some swapping if we see anything else.
            swap(src, X86Registers::ecx);
            m_assembler.shrq_CLr(dest == X86Registers::ecx ? src : dest);
            swap(src, X86Registers::ecx);
        }
    }

    void urshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            move(src, dest);
            urshift64(scratchRegister(), dest);
        } else {
            move(src, dest);
            urshift64(shiftAmount, dest);
        }
    }

    void urshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        move(src, dest);
        urshift64(imm, dest);
    }

    void rotateRight64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.rorq_i8r(imm.m_value, dest);
    }

    void rotateRight64(RegisterID src, RegisterID dest)
    {
        if (src == X86Registers::ecx)
            m_assembler.rorq_CLr(dest);
        else {
            ASSERT(src != dest);

            // Can only rotate by ecx, so we do some swapping if we see anything else.
            swap(src, X86Registers::ecx);
            m_assembler.rorq_CLr(dest == X86Registers::ecx ? src : dest);
            swap(src, X86Registers::ecx);
        }
    }

    void rotateRight64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            move(src, dest);
            rotateRight64(scratchRegister(), dest);
        } else {
            move(src, dest);
            rotateRight64(shiftAmount, dest);
        }
    }

    void rotateRight64(RegisterID src, TrustedImm32 shiftAmount, RegisterID dest)
    {
        move(src, dest);
        rotateRight64(shiftAmount, dest);
    }

    void rotateLeft64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.rolq_i8r(imm.m_value, dest);
    }

    void rotateLeft64(RegisterID src, RegisterID dest)
    {
        if (src == X86Registers::ecx)
            m_assembler.rolq_CLr(dest);
        else {
            ASSERT(src != dest);

            // Can only rotate by ecx, so we do some swapping if we see anything else.
            swap(src, X86Registers::ecx);
            m_assembler.rolq_CLr(dest == X86Registers::ecx ? src : dest);
            swap(src, X86Registers::ecx);
        }
    }

    void rotateLeft64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        if (shiftAmount == dest) {
            move(shiftAmount, scratchRegister());
            move(src, dest);
            rotateLeft64(scratchRegister(), dest);
        } else {
            move(src, dest);
            rotateLeft64(shiftAmount, dest);
        }
    }

    void rotateLeft64(RegisterID src, TrustedImm32 shiftAmount, RegisterID dest)
    {
        move(src, dest);
        rotateLeft64(shiftAmount, dest);
    }

    void mul64(RegisterID src, RegisterID dest)
    {
        m_assembler.imulq_rr(src, dest);
    }

    void mul64(RegisterID src1, RegisterID src2, RegisterID dest)
    {
        if (src2 == dest) {
            m_assembler.imulq_rr(src1, dest);
            return;
        }
        move(src1, dest);
        m_assembler.imulq_rr(src2, dest);
    }
    
    void x86ConvertToQuadWord64()
    {
        m_assembler.cqo();
    }

    void x86ConvertToQuadWord64(RegisterID rax, RegisterID rdx)
    {
        ASSERT_UNUSED(rax, rax == X86Registers::eax);
        ASSERT_UNUSED(rdx, rdx == X86Registers::edx);
        x86ConvertToQuadWord64();
    }

    void x86Div64(RegisterID denominator)
    {
        m_assembler.idivq_r(denominator);
    }

    void x86Div64(RegisterID rax, RegisterID rdx, RegisterID denominator)
    {
        ASSERT_UNUSED(rax, rax == X86Registers::eax);
        ASSERT_UNUSED(rdx, rdx == X86Registers::edx);
        x86Div64(denominator);
    }

    void x86UDiv64(RegisterID denominator)
    {
        m_assembler.divq_r(denominator);
    }

    void x86UDiv64(RegisterID rax, RegisterID rdx, RegisterID denominator)
    {
        ASSERT_UNUSED(rax, rax == X86Registers::eax);
        ASSERT_UNUSED(rdx, rdx == X86Registers::edx);
        x86UDiv64(denominator);
    }

    void neg64(RegisterID dest)
    {
        m_assembler.negq_r(dest);
    }

    void neg64(RegisterID src, RegisterID dest)
    {
        move(src, dest);
        m_assembler.negq_r(dest);
    }

    void neg64(Address dest)
    {
        m_assembler.negq_m(dest.offset, dest.base);
    }

    void neg64(BaseIndex dest)
    {
        m_assembler.negq_m(dest.offset, dest.base, dest.index, dest.scale);
    }

    void or64(RegisterID src, RegisterID dest)
    {
        m_assembler.orq_rr(src, dest);
    }

    void or64(RegisterID src, Address dest)
    {
        m_assembler.orq_rm(src, dest.offset, dest.base);
    }

    void or64(RegisterID src, BaseIndex dest)
    {
        m_assembler.orq_rm(src, dest.offset, dest.base, dest.index, dest.scale);
    }

    void or64(Address src, RegisterID dest)
    {
        m_assembler.orq_mr(src.offset, src.base, dest);
    }

    void or64(BaseIndex src, RegisterID dest)
    {
        m_assembler.orq_mr(src.offset, src.base, src.index, src.scale, dest);
    }

    void or64(TrustedImm32 imm, Address dest)
    {
        m_assembler.orq_im(imm.m_value, dest.offset, dest.base);
    }

    void or64(TrustedImm32 imm, BaseIndex dest)
    {
        m_assembler.orq_im(imm.m_value, dest.offset, dest.base, dest.index, dest.scale);
    }

    void or64(TrustedImm64 imm, RegisterID srcDest)
    {
        if (imm.m_value <= std::numeric_limits<int32_t>::max()
            && imm.m_value >= std::numeric_limits<int32_t>::min()) {
            or64(TrustedImm32(static_cast<int32_t>(imm.m_value)), srcDest);
            return;
        }
        move(imm, scratchRegister());
        or64(scratchRegister(), srcDest);
    }

    void or64(TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.orq_ir(imm.m_value, dest);
    }

    void or64(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        if (op1 == op2)
            move(op1, dest);
        else if (op1 == dest)
            or64(op2, dest);
        else {
            move(op2, dest);
            or64(op1, dest);
        }
    }

    void or64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        move(src, dest);
        or64(imm, dest);
    }

    void sub64(RegisterID src, RegisterID dest)
    {
        m_assembler.subq_rr(src, dest);
    }
    
    void sub64(RegisterID a, RegisterID b, RegisterID dest)
    {
        if (b != dest) {
            move(a, dest);
            sub64(b, dest);
        } else if (a != b) {
            neg64(b);
            add64(a, b);
        } else
            move(TrustedImm32(0), dest);
    }

    void sub64(TrustedImm32 imm, RegisterID dest)
    {
        if (imm.m_value == 1)
            m_assembler.decq_r(dest);
        else
            m_assembler.subq_ir(imm.m_value, dest);
    }

    void sub64(RegisterID a, TrustedImm32 imm, RegisterID dest)
    {
        move(a, dest);
        sub64(imm, dest);
    }

    void sub64(TrustedImm64 imm, RegisterID dest)
    {
        if (imm.m_value == 1)
            m_assembler.decq_r(dest);
        else {
            move(imm, scratchRegister());
            sub64(scratchRegister(), dest);
        }
    }

    void sub64(TrustedImm32 imm, Address address)
    {
        m_assembler.subq_im(imm.m_value, address.offset, address.base);
    }

    void sub64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.subq_im(imm.m_value, address.offset, address.base, address.index, address.scale);
    }

    void sub64(Address src, RegisterID dest)
    {
        m_assembler.subq_mr(src.offset, src.base, dest);
    }

    void sub64(BaseIndex src, RegisterID dest)
    {
        m_assembler.subq_mr(src.offset, src.base, src.index, src.scale, dest);
    }

    void sub64(RegisterID src, Address dest)
    {
        m_assembler.subq_rm(src, dest.offset, dest.base);
    }

    void sub64(RegisterID src, BaseIndex dest)
    {
        m_assembler.subq_rm(src, dest.offset, dest.base, dest.index, dest.scale);
    }

    void xor64(RegisterID src, RegisterID dest)
    {
        m_assembler.xorq_rr(src, dest);
    }

    void xor64(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        if (op1 == op2)
            move(TrustedImm32(0), dest);
        else if (op1 == dest)
            xor64(op2, dest);
        else {
            move(op2, dest);
            xor64(op1, dest);
        }
    }
    
    void xor64(RegisterID src, Address dest)
    {
        m_assembler.xorq_rm(src, dest.offset, dest.base);
    }

    void xor64(RegisterID src, BaseIndex dest)
    {
        m_assembler.xorq_rm(src, dest.offset, dest.base, dest.index, dest.scale);
    }

    void xor64(Address src, RegisterID dest)
    {
        m_assembler.xorq_mr(src.offset, src.base, dest);
    }

    void xor64(BaseIndex src, RegisterID dest)
    {
        m_assembler.xorq_mr(src.offset, src.base, src.index, src.scale, dest);
    }

    void xor64(TrustedImm32 imm, Address dest)
    {
        m_assembler.xorq_im(imm.m_value, dest.offset, dest.base);
    }

    void xor64(TrustedImm32 imm, BaseIndex dest)
    {
        m_assembler.xorq_im(imm.m_value, dest.offset, dest.base, dest.index, dest.scale);
    }

    void xor64(TrustedImm32 imm, RegisterID srcDest)
    {
        m_assembler.xorq_ir(imm.m_value, srcDest);
    }

    void xor64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        move(src, dest);
        xor64(imm, dest);
    }

    void xor64(TrustedImm64 imm, RegisterID srcDest)
    {
        move(imm, scratchRegister());
        xor64(scratchRegister(), srcDest);
    }

    void not64(RegisterID srcDest)
    {
        m_assembler.notq_r(srcDest);
    }

    void not64(Address dest)
    {
        m_assembler.notq_m(dest.offset, dest.base);
    }

    void not64(BaseIndex dest)
    {
        m_assembler.notq_m(dest.offset, dest.base, dest.index, dest.scale);
    }

    void zeroExtend8To64(RegisterID src, RegisterID dest)
    {
        zeroExtend8To32(src, dest);
    }

    void signExtend8To64(RegisterID src, RegisterID dest)
    {
        m_assembler.movsbq_rr(src, dest);
    }

    void zeroExtend16To64(RegisterID src, RegisterID dest)
    {
        zeroExtend16To32(src, dest);
    }

    void signExtend16To64(RegisterID src, RegisterID dest)
    {
        m_assembler.movswq_rr(src, dest);
    }

    void load64(Address address, RegisterID dest)
    {
        m_assembler.movq_mr(address.offset, address.base, dest);
    }

    void load64(BaseIndex address, RegisterID dest)
    {
        m_assembler.movq_mr(address.offset, address.base, address.index, address.scale, dest);
    }

    void load64(const void* address, RegisterID dest)
    {
        if (dest == X86Registers::eax)
            m_assembler.movq_mEAX(address);
        else {
            move(TrustedImmPtr(address), dest);
            load64(Address(dest), dest);
        }
    }

    void loadPair64(RegisterID src, RegisterID dest1, RegisterID dest2)
    {
        loadPair64(src, TrustedImm32(0), dest1, dest2);
    }

    void loadPair64(RegisterID src, TrustedImm32 offset, RegisterID dest1, RegisterID dest2)
    {
        ASSERT(dest1 != dest2); // If it is the same, ldp becomes illegal instruction.
        if (src == dest1) {
            load64(Address(src, offset.m_value + 8), dest2);
            load64(Address(src, offset.m_value), dest1);
        } else {
            load64(Address(src, offset.m_value), dest1);
            load64(Address(src, offset.m_value + 8), dest2);
        }
    }

    DataLabel32 load64WithAddressOffsetPatch(Address address, RegisterID dest)
    {
        padBeforePatch();
        m_assembler.movq_mr_disp32(address.offset, address.base, dest);
        return DataLabel32(this);
    }
    
    DataLabelCompact load64WithCompactAddressOffsetPatch(Address address, RegisterID dest)
    {
        padBeforePatch();
        m_assembler.movq_mr_disp8(address.offset, address.base, dest);
        return DataLabelCompact(this);
    }

    void store64(RegisterID src, Address address)
    {
        m_assembler.movq_rm(src, address.offset, address.base);
    }

    void store64(RegisterID src, BaseIndex address)
    {
        m_assembler.movq_rm(src, address.offset, address.base, address.index, address.scale);
    }
    
    void store64(RegisterID src, void* address)
    {
        if (src == X86Registers::eax)
            m_assembler.movq_EAXm(address);
        else {
            move(TrustedImmPtr(address), scratchRegister());
            store64(src, Address(scratchRegister()));
        }
    }

    void store64(TrustedImm32 imm, Address address)
    {
        m_assembler.movq_i32m(imm.m_value, address.offset, address.base);
    }

    void store64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.movq_i32m(imm.m_value, address.offset, address.base, address.index, address.scale);
    }

    void store64(TrustedImm64 imm, void* address)
    {
        if (CAN_SIGN_EXTEND_32_64(imm.m_value)) {
            auto addressReg = scratchRegister();
            move(TrustedImmPtr(address), addressReg);
            store64(TrustedImm32(static_cast<int32_t>(imm.m_value)), Address(addressReg));
            return;
        }

        auto src = scratchRegister();
        move(imm, src);
        swap(src, X86Registers::eax);
        m_assembler.movq_EAXm(address);
        swap(src, X86Registers::eax);
    }

    void store64(TrustedImm64 imm, Address address)
    {
        if (CAN_SIGN_EXTEND_32_64(imm.m_value)) {
            store64(TrustedImm32(static_cast<int32_t>(imm.m_value)), address);
            return;
        }

        move(imm, scratchRegister());
        store64(scratchRegister(), address);
    }

    void store64(TrustedImmPtr imm, Address address)
    {
        move(imm, scratchRegister());
        store64(scratchRegister(), address);
    }

    void store64(TrustedImm64 imm, BaseIndex address)
    {
        move(imm, scratchRegister());
        m_assembler.movq_rm(scratchRegister(), address.offset, address.base, address.index, address.scale);
    }

    void storePair64(RegisterID src1, RegisterID src2, RegisterID dest)
    {
        storePair64(src1, src2, dest, TrustedImm32(0));
    }

    void storePair64(RegisterID src1, RegisterID src2, RegisterID dest, TrustedImm32 offset)
    {
        store64(src1, Address(dest, offset.m_value));
        store64(src2, Address(dest, offset.m_value + 8));
    }

    void transfer32(Address src, Address dest)
    {
        load32(src, scratchRegister());
        store32(scratchRegister(), dest);
    }

    void transfer64(Address src, Address dest)
    {
        load64(src, scratchRegister());
        store64(scratchRegister(), dest);
    }

    void transferPtr(Address src, Address dest)
    {
        transfer64(src, dest);
    }

    DataLabel32 store64WithAddressOffsetPatch(RegisterID src, Address address)
    {
        padBeforePatch();
        m_assembler.movq_rm_disp32(src, address.offset, address.base);
        return DataLabel32(this);
    }

    void swap64(RegisterID src, RegisterID dest)
    {
        m_assembler.xchgq_rr(src, dest);
    }

    void swap64(RegisterID src, Address dest)
    {
        m_assembler.xchgq_rm(src, dest.offset, dest.base);
    }

    void swapDouble(FPRegisterID reg1, FPRegisterID reg2)
    {
        if (reg1 == reg2)
            return;

        // FIXME: This is kinda a hack since we don't use xmm7 as a temp.
        ASSERT(reg1 != FPRegisterID::xmm7);
        ASSERT(reg2 != FPRegisterID::xmm7);
        moveDouble(reg1, FPRegisterID::xmm7);
        moveDouble(reg2, reg1);
        moveDouble(FPRegisterID::xmm7, reg2);
    }

    void move32ToFloat(RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vmovd_rr(src, dest);
        else
            m_assembler.movd_rr(src, dest);
    }

    void move32ToFloat(TrustedImm32 imm, FPRegisterID dest)
    {
        move(imm, scratchRegister());
        if (supportsAVX())
            m_assembler.vmovd_rr(scratchRegister(), dest);
        else
            m_assembler.movd_rr(scratchRegister(), dest);
    }

    void move64ToDouble(RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vmovq_rr(src, dest);
        else
            m_assembler.movq_rr(src, dest);
    }

    void move64ToDouble(TrustedImm64 imm, FPRegisterID dest)
    {
        move(imm, scratchRegister());
        if (supportsAVX())
            m_assembler.vmovq_rr(scratchRegister(), dest);
        else
            m_assembler.movq_rr(scratchRegister(), dest);
    }

    void moveDoubleTo64(FPRegisterID src, RegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vmovq_rr(src, dest);
        else
            m_assembler.movq_rr(src, dest);
    }
    
    void moveVector(FPRegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vmovaps_rr(src, dest);
        else
            m_assembler.movaps_rr(src, dest);
    }

    void materializeVector(v128_t value, FPRegisterID dest)
    {
        move(TrustedImm64(value.u64x2[0]), scratchRegister());
        vectorReplaceLaneInt64(TrustedImm32(0), scratchRegister(), dest);
        move(TrustedImm64(value.u64x2[1]), scratchRegister());
        vectorReplaceLaneInt64(TrustedImm32(1), scratchRegister(), dest);
    }

    void loadVector(TrustedImmPtr address, FPRegisterID dest)
    {
        move(address, scratchRegister());
        loadVector(Address(scratchRegister()), dest);
    }

    void loadVector(Address address, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vmovups_mr(address.offset, address.base, dest);
    }

    void loadVector(BaseIndex address, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vmovups_mr(address.offset, address.base, address.index, address.scale, dest);
    }
    
    void storeVector(FPRegisterID src, Address address)
    {
        ASSERT(supportsAVX());
        ASSERT(Options::useWebAssemblySIMD());
        m_assembler.vmovups_rm(src, address.offset, address.base);
    }
    
    void storeVector(FPRegisterID src, BaseIndex address)
    {
        ASSERT(supportsAVX());
        ASSERT(Options::useWebAssemblySIMD());
        m_assembler.vmovups_rm(src, address.offset, address.base, address.index, address.scale);
    }

    void compare64(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                test64(*resultCondition, left, left, dest);
                return;
            }
        }

        m_assembler.cmpq_ir(right.m_value, left);
        set32(x86Condition(cond), dest);
    }
    
    void compare64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.cmpq_rr(right, left);
        set32(x86Condition(cond), dest);
    }

    Jump branch64(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        m_assembler.cmpq_rr(right, left);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, RegisterID left, TrustedImm32 right)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond))
                return branchTest64(*resultCondition, left, left);
        }
        m_assembler.cmpq_ir(right.m_value, left);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, RegisterID left, TrustedImm64 right)
    {
        if (((cond == Equal) || (cond == NotEqual)) && !right.m_value) {
            m_assembler.testq_rr(left, left);
            return Jump(m_assembler.jCC(x86Condition(cond)));
        }
        move(right, scratchRegister());
        return branch64(cond, left, scratchRegister());
    }

    Jump branch64(RelationalCondition cond, RegisterID left, Address right)
    {
        m_assembler.cmpq_mr(right.offset, right.base, left);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, AbsoluteAddress left, RegisterID right)
    {
        move(TrustedImmPtr(left.m_ptr), scratchRegister());
        return branch64(cond, Address(scratchRegister()), right);
    }

    Jump branch64(RelationalCondition cond, Address left, RegisterID right)
    {
        m_assembler.cmpq_rm(right, left.offset, left.base);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, Address left, TrustedImm32 right)
    {
        m_assembler.cmpq_im(right.m_value, left.offset, left.base);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, Address left, TrustedImm64 right)
    {
        move(right, scratchRegister());
        return branch64(cond, left, scratchRegister());
    }

    Jump branch64(RelationalCondition cond, BaseIndex address, RegisterID right)
    {
        m_assembler.cmpq_rm(right, address.offset, address.base, address.index, address.scale);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branch64(RelationalCondition cond, Address left, Address right)
    {
        load64(right, scratchRegister());
        return branch64(cond, left, scratchRegister());
    }
    
    Jump branch32(RelationalCondition cond, AbsoluteAddress left, RegisterID right)
    {
        load32(left.m_ptr, scratchRegister());
        return branch32(cond, scratchRegister(), right);
    }

    Jump branchPtr(RelationalCondition cond, BaseIndex left, RegisterID right)
    {
        return branch64(cond, left, right);
    }

    Jump branchPtr(RelationalCondition cond, BaseIndex left, TrustedImmPtr right)
    {
        move(right, scratchRegister());
        return branchPtr(cond, left, scratchRegister());
    }

    Jump branchPtr(RelationalCondition cond, Address left, Address right)
    {
        return branch64(cond, left, right);
    }

    Jump branchTest64(ResultCondition cond, RegisterID reg, RegisterID mask)
    {
        m_assembler.testq_rr(reg, mask);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }
    
    Jump branchTest64(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
    {
        // if we are only interested in the low seven bits, this can be tested with a testb
        if (mask.m_value == -1)
            m_assembler.testq_rr(reg, reg);
        else if ((mask.m_value & ~0x7f) == 0)
            m_assembler.testb_i8r(mask.m_value, reg);
        else
            m_assembler.testq_i32r(mask.m_value, reg);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchTest64(ResultCondition cond, RegisterID reg, TrustedImm64 mask)
    {
        move(mask, scratchRegister());
        return branchTest64(cond, reg, scratchRegister());
    }

    Jump branchTestBit64(ResultCondition cond, RegisterID testValue, TrustedImm32 bit)
    {
        m_assembler.btw_ir(static_cast<unsigned>(bit.m_value) % 64, testValue);
        if (cond == NonZero)
            return Jump(m_assembler.jb());
        if (cond == Zero)
            return Jump(m_assembler.jae());
        RELEASE_ASSERT_NOT_REACHED();
    }

    Jump branchTestBit64(ResultCondition cond, Address testValue, TrustedImm32 bit)
    {
        m_assembler.btw_im(static_cast<unsigned>(bit.m_value) % 64, testValue.offset, testValue.base);
        if (cond == NonZero)
            return Jump(m_assembler.jb());
        if (cond == Zero)
            return Jump(m_assembler.jae());
        RELEASE_ASSERT_NOT_REACHED();
    }

    Jump branchTestBit64(ResultCondition cond, RegisterID reg, RegisterID bit)
    {
        m_assembler.btw_ir(bit, reg);
        if (cond == NonZero)
            return Jump(m_assembler.jb());
        if (cond == Zero)
            return Jump(m_assembler.jae());
        RELEASE_ASSERT_NOT_REACHED();
    }

    void test64(ResultCondition cond, RegisterID reg, TrustedImm32 mask, RegisterID dest)
    {
        if (mask.m_value == -1)
            m_assembler.testq_rr(reg, reg);
        else if ((mask.m_value & ~0x7f) == 0)
            m_assembler.testb_i8r(mask.m_value, reg);
        else
            m_assembler.testq_i32r(mask.m_value, reg);
        set32(x86Condition(cond), dest);
    }

    void test64(ResultCondition cond, RegisterID reg, RegisterID mask, RegisterID dest)
    {
        m_assembler.testq_rr(reg, mask);
        set32(x86Condition(cond), dest);
    }

    Jump branchTest64(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        load64(address.m_ptr, scratchRegister());
        return branchTest64(cond, scratchRegister(), mask);
    }

    Jump branchTest64(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1))
    {
        if (mask.m_value == -1)
            m_assembler.cmpq_im(0, address.offset, address.base);
        else
            m_assembler.testq_i32m(mask.m_value, address.offset, address.base);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchTest64(ResultCondition cond, Address address, RegisterID reg)
    {
        m_assembler.testq_rm(reg, address.offset, address.base);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchTest64(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1))
    {
        if (mask.m_value == -1)
            m_assembler.cmpq_im(0, address.offset, address.base, address.index, address.scale);
        else
            m_assembler.testq_i32m(mask.m_value, address.offset, address.base, address.index, address.scale);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }


    Jump branchAdd64(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        add64(imm, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchAdd64(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID dest)
    {
        if (src1 == dest)
            return branchAdd64(cond, src2, dest);
        move(src2, dest);
        return branchAdd64(cond, src1, dest);
    }

    Jump branchAdd64(ResultCondition cond, Address op1, RegisterID op2, RegisterID dest)
    {
        if (op2 == dest)
            return branchAdd64(cond, op1, dest);
        if (op1.base == dest) {
            load32(op1, dest);
            return branchAdd64(cond, op2, dest);
        }
        move(op2, dest);
        return branchAdd64(cond, op1, dest);
    }

    Jump branchAdd64(ResultCondition cond, RegisterID src1, Address src2, RegisterID dest)
    {
        return branchAdd64(cond, src2, src1, dest);
    }

    Jump branchAdd64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        add64(src, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchAdd64(ResultCondition cond, Address src, RegisterID dest)
    {
        add64(src, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchMul64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        mul64(src, dest);
        if (cond != Overflow)
            m_assembler.testq_rr(dest, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchMul64(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID dest)
    {
        if (src1 == dest)
            return branchMul64(cond, src2, dest);
        move(src2, dest);
        return branchMul64(cond, src1, dest);
    }

    Jump branchSub64(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        sub64(imm, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchSub64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        sub64(src, dest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    Jump branchSub64(ResultCondition cond, RegisterID src1, TrustedImm32 src2, RegisterID dest)
    {
        move(src1, dest);
        return branchSub64(cond, src2, dest);
    }

    Jump branchNeg64(ResultCondition cond, RegisterID srcDest)
    {
        neg64(srcDest);
        return Jump(m_assembler.jCC(x86Condition(cond)));
    }

    void moveConditionally64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID src, RegisterID dest)
    {
        m_assembler.cmpq_rr(right, left);
        cmov(x86Condition(cond), src, dest);
    }

    void moveConditionally64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.cmpq_rr(right, left);

        if (thenCase != dest && elseCase != dest) {
            move(elseCase, dest);
            elseCase = dest;
        }

        if (elseCase == dest)
            cmov(x86Condition(cond), thenCase, dest);
        else
            cmov(x86Condition(invert(cond)), elseCase, dest);
    }

    void moveConditionally64(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                moveConditionallyTest64(*resultCondition, left, left, thenCase, elseCase, dest);
                return;
            }
        }

        m_assembler.cmpq_ir(right.m_value, left);

        if (thenCase != dest && elseCase != dest) {
            move(elseCase, dest);
            elseCase = dest;
        }

        if (elseCase == dest)
            cmov(x86Condition(cond), thenCase, dest);
        else
            cmov(x86Condition(invert(cond)), elseCase, dest);
    }

    void moveConditionallyTest64(ResultCondition cond, RegisterID testReg, RegisterID mask, RegisterID src, RegisterID dest)
    {
        m_assembler.testq_rr(testReg, mask);
        cmov(x86Condition(cond), src, dest);
    }

    void moveConditionallyTest64(ResultCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        ASSERT(isInvertible(cond));
        ASSERT_WITH_MESSAGE(cond != Overflow, "TEST does not set the Overflow Flag.");

        m_assembler.testq_rr(right, left);

        if (thenCase != dest && elseCase != dest) {
            move(elseCase, dest);
            elseCase = dest;
        }

        if (elseCase == dest)
            cmov(x86Condition(cond), thenCase, dest);
        else
            cmov(x86Condition(invert(cond)), elseCase, dest);
    }
    
    void moveConditionallyTest64(ResultCondition cond, RegisterID testReg, TrustedImm32 mask, RegisterID src, RegisterID dest)
    {
        // if we are only interested in the low seven bits, this can be tested with a testb
        if (mask.m_value == -1)
            m_assembler.testq_rr(testReg, testReg);
        else if ((mask.m_value & ~0x7f) == 0)
            m_assembler.testb_i8r(mask.m_value, testReg);
        else
            m_assembler.testq_i32r(mask.m_value, testReg);
        cmov(x86Condition(cond), src, dest);
    }

    void moveConditionallyTest64(ResultCondition cond, RegisterID testReg, TrustedImm32 mask, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        ASSERT(isInvertible(cond));
        ASSERT_WITH_MESSAGE(cond != Overflow, "TEST does not set the Overflow Flag.");

        if (mask.m_value == -1)
            m_assembler.testq_rr(testReg, testReg);
        else if (!(mask.m_value & ~0x7f))
            m_assembler.testb_i8r(mask.m_value, testReg);
        else
            m_assembler.testq_i32r(mask.m_value, testReg);

        if (thenCase != dest && elseCase != dest) {
            move(elseCase, dest);
            elseCase = dest;
        }

        if (elseCase == dest)
            cmov(x86Condition(cond), thenCase, dest);
        else
            cmov(x86Condition(invert(cond)), elseCase, dest);
    }

    template<typename LeftType, typename RightType>
    void moveDoubleConditionally64(RelationalCondition cond, LeftType left, RightType right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        static_assert(!std::is_same<LeftType, FPRegisterID>::value && !std::is_same<RightType, FPRegisterID>::value, "One of the tested argument could be aliased on dest. Use moveDoubleConditionallyDouble().");

        if (thenCase != dest && elseCase != dest) {
            moveDouble(elseCase, dest);
            elseCase = dest;
        }

        if (elseCase == dest) {
            Jump falseCase = branch64(invert(cond), left, right);
            moveDouble(thenCase, dest);
            falseCase.link(this);
        } else {
            Jump trueCase = branch64(cond, left, right);
            moveDouble(elseCase, dest);
            trueCase.link(this);
        }
    }

    template<typename TestType, typename MaskType>
    void moveDoubleConditionallyTest64(ResultCondition cond, TestType test, MaskType mask, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        static_assert(!std::is_same<TestType, FPRegisterID>::value && !std::is_same<MaskType, FPRegisterID>::value, "One of the tested argument could be aliased on dest. Use moveDoubleConditionallyDouble().");

        if (elseCase == dest && isInvertible(cond)) {
            Jump falseCase = branchTest64(invert(cond), test, mask);
            moveDouble(thenCase, dest);
            falseCase.link(this);
        } else if (thenCase == dest) {
            Jump trueCase = branchTest64(cond, test, mask);
            moveDouble(elseCase, dest);
            trueCase.link(this);
        }

        Jump trueCase = branchTest64(cond, test, mask);
        moveDouble(elseCase, dest);
        Jump falseCase = jump();
        trueCase.link(this);
        moveDouble(thenCase, dest);
        falseCase.link(this);
    }
    
    void abortWithReason(AbortReason reason)
    {
        move(TrustedImm32(reason), X86Registers::r11);
        breakpoint();
    }

    void abortWithReason(AbortReason reason, intptr_t misc)
    {
        move(TrustedImm64(misc), X86Registers::r10);
        abortWithReason(reason);
    }

    ConvertibleLoadLabel convertibleLoadPtr(Address address, RegisterID dest)
    {
        ConvertibleLoadLabel result = ConvertibleLoadLabel(this);
        m_assembler.movq_mr(address.offset, address.base, dest);
        return result;
    }

    DataLabelPtr moveWithPatch(TrustedImmPtr initialValue, RegisterID dest)
    {
        padBeforePatch();
        m_assembler.movq_i64r(initialValue.asIntptr(), dest);
        return DataLabelPtr(this);
    }

    DataLabelPtr moveWithPatch(TrustedImm32 initialValue, RegisterID dest)
    {
        padBeforePatch();
        m_assembler.movq_i64r(initialValue.m_value, dest);
        return DataLabelPtr(this);
    }

    Jump branchPtrWithPatch(RelationalCondition cond, RegisterID left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(nullptr))
    {
        dataLabel = moveWithPatch(initialRightValue, scratchRegister());
        return branch64(cond, left, scratchRegister());
    }

    Jump branchPtrWithPatch(RelationalCondition cond, Address left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(nullptr))
    {
        dataLabel = moveWithPatch(initialRightValue, scratchRegister());
        return branch64(cond, left, scratchRegister());
    }

    Jump branch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0))
    {
        padBeforePatch();
        m_assembler.movl_i32r(initialRightValue.m_value, scratchRegister());
        dataLabel = DataLabel32(this);
        return branch32(cond, left, scratchRegister());
    }

    DataLabelPtr storePtrWithPatch(TrustedImmPtr initialValue, Address address)
    {
        DataLabelPtr label = moveWithPatch(initialValue, scratchRegister());
        store64(scratchRegister(), address);
        return label;
    }

    PatchableJump patchableBranch64(RelationalCondition cond, RegisterID reg, TrustedImm64 imm)
    {
        padBeforePatch();
        return PatchableJump(branch64(cond, reg, imm));
    }

    PatchableJump patchableBranch64(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        padBeforePatch();
        return PatchableJump(branch64(cond, left, right));
    }
    
    using MacroAssemblerX86Common::branch8;
    Jump branch8(RelationalCondition cond, AbsoluteAddress left, TrustedImm32 right)
    {
        MacroAssemblerX86Common::move(TrustedImmPtr(left.m_ptr), scratchRegister());
        return MacroAssemblerX86Common::branch8(cond, Address(scratchRegister()), right);
    }
    
    using MacroAssemblerX86Common::branchTest8;
    Jump branchTest8(ResultCondition cond, ExtendedAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8(static_cast<int8_t>(mask.m_value));
        TrustedImmPtr addr(reinterpret_cast<void*>(address.offset));
        MacroAssemblerX86Common::move(addr, scratchRegister());
        return MacroAssemblerX86Common::branchTest8(cond, BaseIndex(scratchRegister(), address.base, TimesOne), mask8);
    }
    
    Jump branchTest8(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8(static_cast<int8_t>(mask.m_value));
        MacroAssemblerX86Common::move(TrustedImmPtr(address.m_ptr), scratchRegister());
        return MacroAssemblerX86Common::branchTest8(cond, Address(scratchRegister()), mask8);
    }

    using MacroAssemblerX86Common::branchTest16;
    Jump branchTest16(ResultCondition cond, ExtendedAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask16(static_cast<int16_t>(mask.m_value));
        TrustedImmPtr addr(reinterpret_cast<void*>(address.offset));
        MacroAssemblerX86Common::move(addr, scratchRegister());
        return MacroAssemblerX86Common::branchTest16(cond, BaseIndex(scratchRegister(), address.base, TimesOne), mask16);
    }

    Jump branchTest16(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask16(static_cast<int16_t>(mask.m_value));
        MacroAssemblerX86Common::move(TrustedImmPtr(address.m_ptr), scratchRegister());
        return MacroAssemblerX86Common::branchTest16(cond, Address(scratchRegister()), mask16);
    }

    void xchg64(RegisterID reg, Address address)
    {
        m_assembler.xchgq_rm(reg, address.offset, address.base);
    }
    
    void xchg64(RegisterID reg, BaseIndex address)
    {
        m_assembler.xchgq_rm(reg, address.offset, address.base, address.index, address.scale);
    }
    
    void atomicStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, Address address, RegisterID result)
    {
        atomicStrongCAS(cond, expectedAndResult, result, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base); });
    }

    void atomicStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, BaseIndex address, RegisterID result)
    {
        atomicStrongCAS(cond, expectedAndResult, result, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base, address.index, address.scale); });
    }

    void atomicStrongCAS64(RegisterID expectedAndResult, RegisterID newValue, Address address)
    {
        atomicStrongCAS(expectedAndResult, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base); });
    }

    void atomicStrongCAS64(RegisterID expectedAndResult, RegisterID newValue, BaseIndex address)
    {
        atomicStrongCAS(expectedAndResult, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base, address.index, address.scale); });
    }

    Jump branchAtomicStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, Address address)
    {
        return branchAtomicStrongCAS(cond, expectedAndResult, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base); });
    }

    Jump branchAtomicStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, BaseIndex address)
    {
        return branchAtomicStrongCAS(cond, expectedAndResult, address, [&] { m_assembler.cmpxchgq_rm(newValue, address.offset, address.base, address.index, address.scale); });
    }

    void atomicWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, Address address, RegisterID result)
    {
        atomicStrongCAS64(cond, expectedAndClobbered, newValue, address, result);
    }

    void atomicWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, BaseIndex address, RegisterID result)
    {
        atomicStrongCAS64(cond, expectedAndClobbered, newValue, address, result);
    }

    Jump branchAtomicWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, Address address)
    {
        return branchAtomicStrongCAS64(cond, expectedAndClobbered, newValue, address);
    }

    Jump branchAtomicWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, BaseIndex address)
    {
        return branchAtomicStrongCAS64(cond, expectedAndClobbered, newValue, address);
    }

    void atomicRelaxedWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, Address address, RegisterID result)
    {
        atomicStrongCAS64(cond, expectedAndClobbered, newValue, address, result);
    }

    void atomicRelaxedWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, BaseIndex address, RegisterID result)
    {
        atomicStrongCAS64(cond, expectedAndClobbered, newValue, address, result);
    }

    Jump branchAtomicRelaxedWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, Address address)
    {
        return branchAtomicStrongCAS64(cond, expectedAndClobbered, newValue, address);
    }

    Jump branchAtomicRelaxedWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, BaseIndex address)
    {
        return branchAtomicStrongCAS64(cond, expectedAndClobbered, newValue, address);
    }

    void atomicAdd64(TrustedImm32 imm, Address address)
    {
        m_assembler.lock();
        add64(imm, address);
    }
    
    void atomicAdd64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.lock();
        add64(imm, address);
    }
    
    void atomicAdd64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        add64(reg, address);
    }
    
    void atomicAdd64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        add64(reg, address);
    }
    
    void atomicSub64(TrustedImm32 imm, Address address)
    {
        m_assembler.lock();
        sub64(imm, address);
    }
    
    void atomicSub64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.lock();
        sub64(imm, address);
    }
    
    void atomicSub64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        sub64(reg, address);
    }
    
    void atomicSub64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        sub64(reg, address);
    }
    
    void atomicAnd64(TrustedImm32 imm, Address address)
    {
        m_assembler.lock();
        and64(imm, address);
    }
    
    void atomicAnd64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.lock();
        and64(imm, address);
    }
    
    void atomicAnd64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        and64(reg, address);
    }
    
    void atomicAnd64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        and64(reg, address);
    }
    
    void atomicOr64(TrustedImm32 imm, Address address)
    {
        m_assembler.lock();
        or64(imm, address);
    }
    
    void atomicOr64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.lock();
        or64(imm, address);
    }
    
    void atomicOr64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        or64(reg, address);
    }
    
    void atomicOr64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        or64(reg, address);
    }
    
    void atomicXor64(TrustedImm32 imm, Address address)
    {
        m_assembler.lock();
        xor64(imm, address);
    }
    
    void atomicXor64(TrustedImm32 imm, BaseIndex address)
    {
        m_assembler.lock();
        xor64(imm, address);
    }
    
    void atomicXor64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        xor64(reg, address);
    }
    
    void atomicXor64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        xor64(reg, address);
    }
    
    void atomicNeg64(Address address)
    {
        m_assembler.lock();
        neg64(address);
    }
    
    void atomicNeg64(BaseIndex address)
    {
        m_assembler.lock();
        neg64(address);
    }
    
    void atomicNot64(Address address)
    {
        m_assembler.lock();
        not64(address);
    }
    
    void atomicNot64(BaseIndex address)
    {
        m_assembler.lock();
        not64(address);
    }
    
    void atomicXchgAdd64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        m_assembler.xaddq_rm(reg, address.offset, address.base);
    }
    
    void atomicXchgAdd64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        m_assembler.xaddq_rm(reg, address.offset, address.base, address.index, address.scale);
    }
    
    void atomicXchg64(RegisterID reg, Address address)
    {
        m_assembler.lock();
        m_assembler.xchgq_rm(reg, address.offset, address.base);
    }
    
    void atomicXchg64(RegisterID reg, BaseIndex address)
    {
        m_assembler.lock();
        m_assembler.xchgq_rm(reg, address.offset, address.base, address.index, address.scale);
    }

    void atomicLoad64(Address address, RegisterID dest)
    {
        load64(address, dest);
    }

    void atomicLoad64(BaseIndex address, RegisterID dest)
    {
        load64(address, dest);
    }
    
#if ENABLE(FAST_TLS_JIT)
    void loadFromTLS64(uint32_t offset, RegisterID dst)
    {
        m_assembler.gs();
        m_assembler.movq_mr(offset, dst);
    }

    void storeToTLS64(RegisterID src, uint32_t offset)
    {
        m_assembler.gs();
        m_assembler.movq_rm(src, offset);
    }
#endif

    void truncateDoubleToUint32(FPRegisterID src, RegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvttsd2siq_rr(src, dest);
        else
            m_assembler.cvttsd2siq_rr(src, dest);
    }

    void truncateDoubleToInt64(FPRegisterID src, RegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvttsd2siq_rr(src, dest);
        else
            m_assembler.cvttsd2siq_rr(src, dest);
    }

    // int64Min should contain exactly 0x43E0000000000000 == static_cast<double>(int64_t::min()). scratch may
    // be the same FPR as src.
    void truncateDoubleToUint64(FPRegisterID src, RegisterID dest, FPRegisterID scratch, FPRegisterID int64Min)
    {
        ASSERT(scratch != int64Min);

        // Since X86 does not have a floating point to unsigned integer instruction, we need to use the signed
        // integer conversion instruction. If the src is less than int64_t::min() then the results of the two
        // instructions are the same. Otherwise, we need to: subtract int64_t::min(); truncate double to
        // uint64_t; then add back int64_t::min() in the destination gpr.

        Jump large = branchDouble(DoubleGreaterThanOrEqualAndOrdered, src, int64Min);
        if (supportsAVX())
            m_assembler.vcvttsd2siq_rr(src, dest);
        else
            m_assembler.cvttsd2siq_rr(src, dest);
        Jump done = jump();
        large.link(this);
        if (supportsAVX()) {
            m_assembler.vsubsd_rrr(int64Min, src, scratch);
            m_assembler.vcvttsd2siq_rr(scratch, dest);
        } else {
            moveDouble(src, scratch);
            m_assembler.subsd_rr(int64Min, scratch);
            m_assembler.cvttsd2siq_rr(scratch, dest);
        }

        m_assembler.movq_i64r(0x8000000000000000, scratchRegister());
        m_assembler.orq_rr(scratchRegister(), dest);
        done.link(this);
    }

    void truncateFloatToUint32(FPRegisterID src, RegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvttss2siq_rr(src, dest);
        else
            m_assembler.cvttss2siq_rr(src, dest);
    }

    void truncateFloatToInt64(FPRegisterID src, RegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvttss2siq_rr(src, dest);
        else
            m_assembler.cvttss2siq_rr(src, dest);
    }

    // int64Min should contain exactly 0x5f000000 == static_cast<float>(int64_t::min()). scratch may be the
    // same FPR as src.
    void truncateFloatToUint64(FPRegisterID src, RegisterID dest, FPRegisterID scratch, FPRegisterID int64Min)
    {
        ASSERT(scratch != int64Min);

        // Since X86 does not have a floating point to unsigned integer instruction, we need to use the signed
        // integer conversion instruction. If the src is less than int64_t::min() then the results of the two
        // instructions are the same. Otherwise, we need to: subtract int64_t::min(); truncate double to
        // uint64_t; then add back int64_t::min() in the destination gpr.

        Jump large = branchFloat(DoubleGreaterThanOrEqualAndOrdered, src, int64Min);
        if (supportsAVX())
            m_assembler.vcvttss2siq_rr(src, dest);
        else
            m_assembler.cvttss2siq_rr(src, dest);
        Jump done = jump();
        large.link(this);
        if (supportsAVX()) {
            m_assembler.vsubss_rrr(int64Min, src, scratch);
            m_assembler.vcvttss2siq_rr(scratch, dest);
        } else {
            moveDouble(src, scratch);
            m_assembler.subss_rr(int64Min, scratch);
            m_assembler.cvttss2siq_rr(scratch, dest);
        }
        m_assembler.movq_i64r(0x8000000000000000, scratchRegister());
        m_assembler.orq_rr(scratchRegister(), dest);
        done.link(this);
    }

    void convertInt64ToDouble(RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvtsi2sdq_rrr(src, dest, dest);
        else
            m_assembler.cvtsi2sdq_rr(src, dest);
    }

    void convertInt64ToDouble(Address src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvtsi2sdq_mrr(src.offset, src.base, dest, dest);
        else
            m_assembler.cvtsi2sdq_mr(src.offset, src.base, dest);
    }

    void convertInt64ToFloat(RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvtsi2ssq_rrr(src, dest, dest);
        else
            m_assembler.cvtsi2ssq_rr(src, dest);
    }

    void convertInt64ToFloat(Address src, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvtsi2ssq_mrr(src.offset, src.base, dest, dest);
        else
            m_assembler.cvtsi2ssq_mr(src.offset, src.base, dest);
    }

    // One of scratch or scratch2 may be the same as src
    void convertUInt64ToDouble(RegisterID src, FPRegisterID dest, RegisterID scratch)
    {
        RegisterID scratch2 = scratchRegister();

        m_assembler.testq_rr(src, src);
        AssemblerLabel signBitSet = m_assembler.jCC(x86Condition(Signed));
        if (supportsAVX())
            m_assembler.vcvtsi2sdq_rrr(src, dest, dest);
        else
            m_assembler.cvtsi2sdq_rr(src, dest);
        AssemblerLabel done = m_assembler.jmp();
        m_assembler.linkJump(signBitSet, m_assembler.label());
        if (scratch != src)
            m_assembler.movq_rr(src, scratch);
        m_assembler.movq_rr(src, scratch2);
        m_assembler.shrq_i8r(1, scratch);
        m_assembler.andq_ir(1, scratch2);
        m_assembler.orq_rr(scratch, scratch2);
        if (supportsAVX()) {
            m_assembler.vcvtsi2sdq_rrr(scratch2, dest, dest);
            m_assembler.vaddsd_rrr(dest, dest, dest);
        } else {
            m_assembler.cvtsi2sdq_rr(scratch2, dest);
            m_assembler.addsd_rr(dest, dest);
        }
        m_assembler.linkJump(done, m_assembler.label());
    }

    // One of scratch or scratch2 may be the same as src
    void convertUInt64ToFloat(RegisterID src, FPRegisterID dest, RegisterID scratch)
    {
        RegisterID scratch2 = scratchRegister();
        m_assembler.testq_rr(src, src);
        AssemblerLabel signBitSet = m_assembler.jCC(x86Condition(Signed));
        if (supportsAVX())
            m_assembler.vcvtsi2ssq_rrr(src, dest, dest);
        else
            m_assembler.cvtsi2ssq_rr(src, dest);
        AssemblerLabel done = m_assembler.jmp();
        m_assembler.linkJump(signBitSet, m_assembler.label());
        if (scratch != src)
            m_assembler.movq_rr(src, scratch);
        m_assembler.movq_rr(src, scratch2);
        m_assembler.shrq_i8r(1, scratch);
        m_assembler.andq_ir(1, scratch2);
        m_assembler.orq_rr(scratch, scratch2);
        if (supportsAVX()) {
            m_assembler.vcvtsi2ssq_rrr(scratch2, dest, dest);
            m_assembler.vaddss_rrr(dest, dest, dest);
        } else {
            m_assembler.cvtsi2ssq_rr(scratch2, dest);
            m_assembler.addss_rr(dest, dest);
        }
        m_assembler.linkJump(done, m_assembler.label());
    }

    // SIMD

    void signExtendForSIMDLane(RegisterID reg, SIMDLane simdLane)
    {
        RELEASE_ASSERT(scalarTypeIsIntegral(simdLane));
        if (elementByteSize(simdLane) == 1)
            m_assembler.movsbl_rr(reg, reg);
        else if (elementByteSize(simdLane) == 2)
            m_assembler.movswl_rr(reg, reg);
        else
            RELEASE_ASSERT_NOT_REACHED();
    }

    void vectorReplaceLaneAVX(SIMDLane simdLane, TrustedImm32 lane, RegisterID src, FPRegisterID dest)
    {
        switch (simdLane) {
        case SIMDLane::i8x16:
            m_assembler.vpinsrb_i8rrr(lane.m_value, src, dest, dest);
            return;
        case SIMDLane::i16x8:
            m_assembler.vpinsrw_i8rrr(lane.m_value, src, dest, dest);
            return;
        case SIMDLane::i32x4:
            m_assembler.vpinsrd_i8rrr(lane.m_value, src, dest, dest);
            return;
        case SIMDLane::i64x2:
            m_assembler.vpinsrq_i8rrr(lane.m_value, src, dest, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorReplaceLane(SIMDLane simdLane, TrustedImm32 lane, RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            return vectorReplaceLaneAVX(simdLane, lane, src, dest);

        switch (simdLane) {
        case SIMDLane::i8x16:
            m_assembler.pinsrb_i8rr(lane.m_value, src, dest);
            return;
        case SIMDLane::i16x8:
            m_assembler.pinsrw_i8rr(lane.m_value, src, dest);
            return;
        case SIMDLane::i32x4:
            m_assembler.pinsrd_i8rr(lane.m_value, src, dest);
            return;
        case SIMDLane::i64x2:
            m_assembler.pinsrq_i8rr(lane.m_value, src, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorReplaceLaneAVX(SIMDLane simdLane, TrustedImm32 lane, FPRegisterID src, FPRegisterID dest)
    {
        switch (simdLane) {
        case SIMDLane::f32x4:
            m_assembler.vinsertps_i8rrr(lane.m_value, src, dest, dest);
            return;
        case SIMDLane::f64x2:
            ASSERT(lane.m_value < 2);
            if (lane.m_value)
                m_assembler.vunpcklpd_rrr(src, dest, dest);
            else
                m_assembler.vmovsd_rrr(src, dest, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorReplaceLane(SIMDLane simdLane, TrustedImm32 lane, FPRegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            return vectorReplaceLaneAVX(simdLane, lane, src, dest);

        switch (simdLane) {
        case SIMDLane::f32x4:
            if (supportsSSE4_1())
                m_assembler.insertps_i8rr(lane.m_value, src, dest);
            else
                RELEASE_ASSERT_NOT_REACHED();
            return;
        case SIMDLane::f64x2:
            ASSERT(lane.m_value < 2);
            if (lane.m_value)
                m_assembler.unpcklpd_rr(src, dest);
            else
                m_assembler.movsd_rr(src, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    DEFINE_SIMD_FUNCS(vectorReplaceLane);

    void vectorExtractLane(SIMDLane simdLane, SIMDSignMode signMode, TrustedImm32 lane, FPRegisterID src, RegisterID dest)
    {
        switch (simdLane) {
        case SIMDLane::i8x16:
            if (supportsAVX())
                m_assembler.vpextrb_i8rr(lane.m_value, src, dest);
            else
                m_assembler.pextrb_i8rr(lane.m_value, src, dest);
            break;
        case SIMDLane::i16x8:
            if (supportsAVX())
                m_assembler.vpextrw_i8rr(lane.m_value, src, dest);
            else
                m_assembler.pextrw_i8rr(lane.m_value, src, dest);
            break;
        case SIMDLane::i32x4:
            if (supportsAVX())
                m_assembler.vpextrd_i8rr(lane.m_value, src, dest);
            else
                m_assembler.pextrd_i8rr(lane.m_value, src, dest);
            break;
        case SIMDLane::i64x2:
            if (supportsAVX())
                m_assembler.vpextrq_i8rr(lane.m_value, src, dest);
            else
                m_assembler.pextrq_i8rr(lane.m_value, src, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }

        if (signMode == SIMDSignMode::Signed)
            signExtendForSIMDLane(dest, simdLane);
    }

    void vectorExtractLaneAVX(SIMDLane simdLane, TrustedImm32 lane, FPRegisterID src, FPRegisterID dest)
    {
        if (!lane.m_value) {
            if (src != dest)
                m_assembler.vmovaps_rr(src, dest);
            return;
        }

        switch (simdLane) {
        case SIMDLane::f32x4: {
            ASSERT(lane.m_value < 4);
            if (lane.m_value == 1) {
                m_assembler.vmovshdup_rr(src, dest);
                return;
            }

            if (lane.m_value == 2) {
                m_assembler.vmovhlps_rrr(src, dest, dest);
                return;
            }

            if (src != dest)
                m_assembler.vpshufd_i8rr(lane.m_value, src, dest);
            else {
                ASSERT(src == dest);
                m_assembler.vshufps_i8rrr(lane.m_value, dest, dest, dest);
            }
            return;
        }
        case SIMDLane::f64x2:
            ASSERT(lane.m_value == 1);
            m_assembler.vmovhlps_rrr(src, dest, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorExtractLane(SIMDLane simdLane, TrustedImm32 lane, FPRegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            return vectorExtractLaneAVX(simdLane, lane, src, dest);

        // For lane 0, we just move since we do not ensure the upper bits.
        if (!lane.m_value) {
            if (src != dest)
                m_assembler.movaps_rr(src, dest);
            return;
        }

        switch (simdLane) {
        case SIMDLane::f32x4: {
            ASSERT(lane.m_value < 4);
            if (lane.m_value == 1 && supportsSSE3()) {
                m_assembler.movshdup_rr(src, dest);
                return;
            }

            if (lane.m_value == 2) {
                m_assembler.movhlps_rr(src, dest);
                return;
            }

            if (src != dest)
                m_assembler.pshufd_i8rr(lane.m_value, src, dest);
            else {
                ASSERT(src == dest);
                m_assembler.shufps_i8rr(lane.m_value, dest, dest);
            }
            return;
        }
        case SIMDLane::f64x2:
            ASSERT(lane.m_value == 1);
            m_assembler.movhlps_rr(src, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    DEFINE_SIGNED_SIMD_FUNCS(vectorExtractLane);

    void vectorDupElement(SIMDLane simdLane, TrustedImm32 lane, FPRegisterID src, FPRegisterID dest)
    {
        UNUSED_PARAM(simdLane); UNUSED_PARAM(lane); UNUSED_PARAM(src); UNUSED_PARAM(dest);
    }

    DEFINE_SIMD_FUNCS(vectorDupElement);

    void compareFloatingPointVectorUnordered(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));

        using PackedCompareCondition = X86Assembler::PackedCompareCondition;

        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vcmpps_rrr(PackedCompareCondition::Unordered, right, left, dest);
        else
            m_assembler.vcmppd_rrr(PackedCompareCondition::Unordered, right, left, dest);
    }

    void compareFloatingPointVector(DoubleCondition cond, SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));

        using PackedCompareCondition = X86Assembler::PackedCompareCondition;

        switch (cond) {
        case DoubleEqualAndOrdered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::EqualAndOrdered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::EqualAndOrdered, right, left, dest);
            break;
        case DoubleNotEqualOrUnordered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::NotEqualOrUnordered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::NotEqualOrUnordered, right, left, dest);
            break;
        case DoubleGreaterThanAndOrdered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::GreaterThanAndOrdered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::GreaterThanAndOrdered, right, left, dest);
            break;
        case DoubleGreaterThanOrEqualAndOrdered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::GreaterThanOrEqualAndOrdered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::GreaterThanOrEqualAndOrdered, right, left, dest);
            break;
        case DoubleLessThanAndOrdered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::LessThanAndOrdered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::LessThanAndOrdered, right, left, dest);
            break;
        case DoubleLessThanOrEqualAndOrdered:
            if (simdInfo.lane == SIMDLane::f32x4)
                m_assembler.vcmpps_rrr(PackedCompareCondition::LessThanOrEqualAndOrdered, right, left, dest);
            else
                m_assembler.vcmppd_rrr(PackedCompareCondition::LessThanOrEqualAndOrdered, right, left, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void compareIntegerVector(RelationalCondition cond, SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest, FPRegisterID scratch)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(scalarTypeIsIntegral(simdInfo.lane));

        switch (cond) {
        case Equal:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpcmpeqb_rrr(right, left, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpcmpeqw_rrr(right, left, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpcmpeqd_rrr(right, left, dest);
                break;
            case SIMDLane::i64x2:
                m_assembler.vpcmpeqq_rrr(right, left, dest);
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case NotEqual:
            // NotEqual comparisons are implemented by negating Equal on Intel, which should be
            // handled before we ever reach this point.
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Shouldn't emit integer vector NotEqual comparisons directly.");
            break;
        case Above:
            // Above comparisons are implemented by negating BelowOrEqual on Intel, which should be
            // handled before we ever reach this point.
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Shouldn't emit integer vector Above comparisons directly.");
            break;
        case AboveOrEqual:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpmaxub_rrr(right, left, scratch);
                m_assembler.vpcmpeqb_rrr(left, scratch, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpmaxuw_rrr(right, left, scratch);
                m_assembler.vpcmpeqw_rrr(left, scratch, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpmaxud_rrr(right, left, scratch);
                m_assembler.vpcmpeqd_rrr(left, scratch, dest);
                break;
            case SIMDLane::i64x2:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64x2 unsigned comparisons are not supported.");
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case Below:
            // Below comparisons are implemented by negating AboveOrEqual on Intel, which should be
            // handled before we ever reach this point.
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Shouldn't emit integer vector Below comparisons directly.");
            break;
        case BelowOrEqual:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpminub_rrr(right, left, scratch);
                m_assembler.vpcmpeqb_rrr(left, scratch, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpminuw_rrr(right, left, scratch);
                m_assembler.vpcmpeqw_rrr(left, scratch, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpminud_rrr(right, left, scratch);
                m_assembler.vpcmpeqd_rrr(left, scratch, dest);
                break;
            case SIMDLane::i64x2:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64x2 unsigned comparisons are not supported.");
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case GreaterThan:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpcmpgtb_rrr(right, left, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpcmpgtw_rrr(right, left, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpcmpgtd_rrr(right, left, dest);
                break;
            case SIMDLane::i64x2:
                m_assembler.vpcmpgtq_rrr(right, left, dest);
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case GreaterThanOrEqual:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpmaxsb_rrr(right, left, scratch);
                m_assembler.vpcmpeqb_rrr(left, scratch, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpmaxsw_rrr(right, left, scratch);
                m_assembler.vpcmpeqw_rrr(left, scratch, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpmaxsd_rrr(right, left, scratch);
                m_assembler.vpcmpeqd_rrr(left, scratch, dest);
                break;
            case SIMDLane::i64x2:
                // Intel doesn't support 64-bit packed maximum/minimum without AVX512, so this condition should have been transformed
                // into a negated LessThan prior to reaching the macro assembler.
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Shouldn't emit integer vector GreaterThanOrEqual comparisons directly.");
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case LessThan:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpcmpgtb_rrr(left, right, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpcmpgtw_rrr(left, right, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpcmpgtd_rrr(left, right, dest);
                break;
            case SIMDLane::i64x2:
                m_assembler.vpcmpgtq_rrr(left, right, dest);
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        case LessThanOrEqual:
            switch (simdInfo.lane) {
            case SIMDLane::i8x16:
                m_assembler.vpminsb_rrr(right, left, scratch);
                m_assembler.vpcmpeqb_rrr(left, scratch, dest);
                break;
            case SIMDLane::i16x8:
                m_assembler.vpminsw_rrr(right, left, scratch);
                m_assembler.vpcmpeqw_rrr(left, scratch, dest);
                break;
            case SIMDLane::i32x4:
                m_assembler.vpminsd_rrr(right, left, scratch);
                m_assembler.vpcmpeqd_rrr(left, scratch, dest);
                break;
            case SIMDLane::i64x2:
                // Intel doesn't support 64-bit packed maximum/minimum without AVX512, so this condition should have been transformed
                // into a negated GreaterThan prior to reaching the macro assembler.
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Shouldn't emit integer vector LessThanOrEqual comparisons directly.");
                break;
            default:
                RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Unsupported SIMD lane for comparison");
            }
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void compareIntegerVectorWithZero(RelationalCondition cond, SIMDInfo simdInfo, FPRegisterID vector, FPRegisterID dest, RegisterID scratch)
    {
        RELEASE_ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(cond == RelationalCondition::Equal || cond == RelationalCondition::NotEqual);

        m_assembler.vptest_rr(vector, vector);
        m_assembler.setCC_r(x86Condition(cond), scratch);
        vectorSplatInt8(scratch, dest);
    }

    void vectorAdd(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());

        switch (simdInfo.lane) {
        case SIMDLane::f32x4:
            m_assembler.vaddps_rrr(right, left, dest);
            break;
        case SIMDLane::f64x2:
            m_assembler.vaddpd_rrr(right, left, dest);
            break;
        case SIMDLane::i8x16:
            m_assembler.vpaddb_rrr(right, left, dest);
            break;
        case SIMDLane::i16x8:
            m_assembler.vpaddw_rrr(right, left, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpaddd_rrr(right, left, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpaddq_rrr(right, left, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector add.");
        }
    }

    void vectorSub(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());

        switch (simdInfo.lane) {
        case SIMDLane::f32x4:
            m_assembler.vsubps_rrr(right, left, dest);
            break;
        case SIMDLane::f64x2:
            m_assembler.vsubpd_rrr(right, left, dest);
            break;
        case SIMDLane::i8x16:
            m_assembler.vpsubb_rrr(right, left, dest);
            break;
        case SIMDLane::i16x8:
            m_assembler.vpsubw_rrr(right, left, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpsubd_rrr(right, left, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpsubq_rrr(right, left, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector subtract.");
        }
    }

    void vectorMul(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());

        switch (simdInfo.lane) {
        case SIMDLane::f32x4:
            m_assembler.vmulps_rrr(right, left, dest);
            break;
        case SIMDLane::f64x2:
            m_assembler.vmulpd_rrr(right, left, dest);
            break;
        case SIMDLane::i16x8:
            m_assembler.vpmullw_rrr(right, left, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpmulld_rrr(right, left, dest);
            break;
        case SIMDLane::i64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64x2 multiply is not supported on Intel without AVX-512. This instruction should have been lowered before reaching the assembler.");
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector multiply.");
        }
    }

    void vectorDiv(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        switch (simdInfo.lane) {
        case SIMDLane::f32x4:
            m_assembler.vdivps_rrr(right, left, dest);
            break;
        case SIMDLane::f64x2:
            m_assembler.vdivpd_rrr(right, left, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector divide.");
        }
    }

    void vectorMax(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpmaxsb_rrr(right, left, dest);
                else
                    m_assembler.vpmaxub_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed) {
                    if (supportsSSE4_1())
                        m_assembler.pmaxsb_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                } else
                    m_assembler.pmaxub_rr(right, dest);
            }
            return;
        case SIMDLane::i16x8:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpmaxsw_rrr(right, left, dest);
                else
                    m_assembler.vpmaxuw_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.pmaxsw_rr(right, dest);
                else {
                    if (supportsSSE4_1())
                        m_assembler.pmaxuw_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                }
            }
            return;
        case SIMDLane::i32x4:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpmaxsd_rrr(right, left, dest);
                else
                    m_assembler.vpmaxud_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed) {
                    if (supportsSSE4_1())
                        m_assembler.pmaxsd_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                } else
                    m_assembler.pmaxud_rr(right, dest);
            }
            return;
        case SIMDLane::f32x4:
        case SIMDLane::f64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Should have expanded f32x4/f64x2 maximum before reaching macro assembler.");
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorMin(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpminsb_rrr(right, left, dest);
                else
                    m_assembler.vpminub_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed) {
                    if (supportsSSE4_1())
                        m_assembler.pminsb_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                } else
                    m_assembler.pminub_rr(right, dest);
            }
            return;
        case SIMDLane::i16x8:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpminsw_rrr(right, left, dest);
                else
                    m_assembler.vpminuw_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.pminsw_rr(right, dest);
                else {
                    if (supportsSSE4_1())
                        m_assembler.pminuw_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                }
            }
            return;
        case SIMDLane::i32x4:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpminsd_rrr(right, left, dest);
                else
                    m_assembler.vpminud_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed) {
                    if (supportsSSE4_1())
                        m_assembler.pminsd_rr(right, dest);
                    else
                        RELEASE_ASSERT_NOT_REACHED();
                } else
                    m_assembler.pminud_rr(right, dest);
            }
            return;
        case SIMDLane::f32x4:
        case SIMDLane::f64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Should have expanded f32x4/f64x2 minimum before reaching macro assembler.");
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorPmin(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        // When comparing min(0.0, -0.0), the WebAssembly semantics of Pmin say we should return 0.0, since
        // Pmin is defined as right < left ? right : left. However, the vminps instruction breaks ties towards the second
        // source operand - essentially left < right ? left : right. So we reverse the usual operand order for the
        // instruction.
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vminps_rrr(left, right, dest);
        else
            m_assembler.vminpd_rrr(left, right, dest);
    }

    void vectorPmax(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        // When comparing max(0.0, -0.0), the WebAssembly semantics of Pmax say we should return 0.0, since
        // Pmax is defined as right > left ? right : left. However, the vmaxps instruction breaks ties towards the second
        // source operand - essentially left > right ? left : right. So we reverse the usual operand order for the
        // instruction.
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vmaxps_rrr(left, right, dest);
        else
            m_assembler.vmaxpd_rrr(left, right, dest);
    }

    void vectorBitwiseSelect(FPRegisterID left, FPRegisterID right, FPRegisterID inputBitsAndDest)
    {
        UNUSED_PARAM(left); UNUSED_PARAM(right); UNUSED_PARAM(inputBitsAndDest);
    }

    void vectorAnd(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(simdInfo.lane == SIMDLane::v128);
        m_assembler.vandps_rrr(right, left, dest);
    }

    void vectorAndnot(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(simdInfo.lane == SIMDLane::v128);
        // WebAssembly v128.andnot is equivalent to (v128.and left (v128.not right)). However, the Intel
        // vandnps instruction negates the first source operand, essentially (v128.and (v128.not left) right).
        // To achieve correct WebAssembly semantics, we provide left and right in reversed order here.
        m_assembler.vandnps_rrr(left, right, dest);
    }

    void vectorOr(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(simdInfo.lane == SIMDLane::v128);
        m_assembler.vorps_rrr(right, left, dest);
    }

    void vectorXor(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        RELEASE_ASSERT(simdInfo.lane == SIMDLane::v128);
        m_assembler.vxorps_rrr(right, left, dest);
    }

    void moveZeroToVector(FPRegisterID dest)
    {
        vectorXor({ SIMDLane::v128, SIMDSignMode::None }, dest, dest, dest);
    }

    void vectorAbsInt64(FPRegisterID input, FPRegisterID dest, FPRegisterID scratch)
    {
        // https://github.com/WebAssembly/simd/pull/413
        ASSERT(supportsAVX());
        m_assembler.vpxor_rrr(scratch, scratch, scratch);
        m_assembler.vpsubq_rrr(input, scratch, scratch);
        m_assembler.vblendvpd_rrrr(input, scratch, input, dest);
    }

    void vectorAbs(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX())
                m_assembler.vpabsb_rr(input, dest);
            else if (supportsSupplementalSSE3())
                m_assembler.pabsb_rr(input, dest);
            else
                RELEASE_ASSERT_NOT_REACHED();
            return;
        case SIMDLane::i16x8:
            if (supportsAVX())
                m_assembler.vpabsw_rr(input, dest);
            else if (supportsSupplementalSSE3())
                m_assembler.pabsw_rr(input, dest);
            else
                RELEASE_ASSERT_NOT_REACHED();
            return;
        case SIMDLane::i32x4:
            if (supportsAVX())
                m_assembler.vpabsd_rr(input, dest);
            else if (supportsSupplementalSSE3())
                m_assembler.pabsd_rr(input, dest);
            else
                RELEASE_ASSERT_NOT_REACHED();
            return;
        case SIMDLane::i64x2:
        case SIMDLane::f32x4:
        case SIMDLane::f64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64, f32, f64 vector absolute value are not supported on x86, so this should have been expanded out prior to reaching the macro assembler.");
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    using RoundingType = X86Assembler::RoundingType;

    void vectorCeil(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vroundps_rr(input, dest, RoundingType::TowardInfiniti);
        else
            m_assembler.vroundpd_rr(input, dest, RoundingType::TowardInfiniti);
    }

    void vectorFloor(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vroundps_rr(input, dest, RoundingType::TowardNegativeInfiniti);
        else
            m_assembler.vroundpd_rr(input, dest, RoundingType::TowardNegativeInfiniti);
    }

    void vectorTrunc(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vroundps_rr(input, dest, RoundingType::TowardZero);
        else
            m_assembler.vroundpd_rr(input, dest, RoundingType::TowardZero);
    }

    void vectorTruncSat(SIMDInfo simdInfo, FPRegisterID src, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR1, FPRegisterID scratchFPR2)
    {
        ASSERT(supportsAVX());
        ASSERT_UNUSED(simdInfo, simdInfo.signMode == SIMDSignMode::Signed);
        ASSERT(simdInfo.lane == SIMDLane::f32x4);

        // The instruction cvttps2dq only saturates overflows to 0x80000000 and cannot handle NaN.
        // However, i32x4.nearest_sat_f32x4_s requires:
        //     1. saturate positive-overflow integer to 0x7FFFFFFF
        //     2. saturate negative-overflow integer to 0x80000000
        //     3. convert NaN or -0 to 0.

        m_assembler.vmovaps_rr(src, scratchFPR1);                               // scratchFPR1 = src
        m_assembler.vcmpunordps_rrr(scratchFPR1, scratchFPR1, scratchFPR1);     // scratchFPR1 = NaN mask by unordered comparison
        m_assembler.vandnps_rrr(src, scratchFPR1, scratchFPR1);                 // scratchFPR1 = src with NaN lanes cleared

        alignas(16) static constexpr float masks[] = {
            0x1.0p+31f,
            0x1.0p+31f,
            0x1.0p+31f,
            0x1.0p+31f,
        };
        move(TrustedImmPtr(masks), scratchGPR);                                 // scratchGPR = minimum positive-overflow integer 0x80000000
        m_assembler.vcmpnltps_mrr(0, scratchGPR, scratchFPR1, scratchFPR2);     // scratchFPR2 = positive-overflow mask by checking src >= 0x80000000

        m_assembler.vcvttps2dq_rr(scratchFPR1, scratchFPR1);                    // convert scratchFPR1 to integer with overflow saturated to 0x80000000

        m_assembler.vpxor_rrr(scratchFPR2, scratchFPR1, dest);                  // convert positive-overflow lane to 0x7FFFFFFF
    }

    void vectorTruncSatUnsignedFloat32(FPRegisterID src, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR1, FPRegisterID scratchFPR2)
    {
        ASSERT(supportsAVX());

        // https://github.com/WebAssembly/simd/pull/247
        // https://github.com/WebAssembly/relaxed-simd/issues/21

        // The instruction cvttps2dq only saturates overflows to 0x80000000 and cannot handle NaN.
        // However, i32x4.nearest_sat_f32x4_u requires:
        //     1. saturate positive-overflow integer to 0xFFFFFFFF
        //     2. saturate negative-overflow integer to 0
        //     3. convert NaN or -0 to 0.    
        
        m_assembler.vxorps_rrr(scratchFPR1, scratchFPR1, scratchFPR1);
        m_assembler.vmaxps_rrr(scratchFPR1, src, dest);                     // dest = f[lane]x4 = src with NaN and negatives cleared

        alignas(16) static constexpr float masks[] = {
            2147483647.0f,
            2147483647.0f,
            2147483647.0f,
            2147483647.0f,
        };
        move(TrustedImmPtr(masks), scratchGPR);                             // scratchGPR = f[0x80000000]x4

        m_assembler.vmovaps_rr(dest, scratchFPR2);
        m_assembler.vsubps_mrr(0, scratchGPR, scratchFPR2, scratchFPR2);    // scratchFPR2 = f[lane - 0x80000000]x4

        m_assembler.vcmpnltps_mrr(0, scratchGPR, scratchFPR2, scratchFPR1); // scratchFPR1 = mask for [lane >= 0xFFFFFFFF]x4

        m_assembler.vcvttps2dq_rr(scratchFPR2, scratchFPR2);                // scratchFPR2 = i[lane - 0x80000000]x4 with satruated lane 0x80000000 for int32 overflow

        m_assembler.vpxor_rrr(scratchFPR1, scratchFPR2, scratchFPR2);       // scratchFPR2 = i[lane - 0x80000000]x4 with satruated lane 0x7FFFFFFF for int32 positive-overflow and 0x80000000 for int32 negative-overflow

        m_assembler.vpxor_rrr(scratchFPR1, scratchFPR1, scratchFPR1);
        m_assembler.vpmaxsd_rrr(scratchFPR1, scratchFPR2, scratchFPR2);     // scratchFPR2 = i[lane - 0x80000000]x4 with satruated lane 0x7FFFFFFF for int32 positive-overflow and negatives cleared

        m_assembler.vcvttps2dq_rr(dest, dest);                              // dest = i[lane]x4 with satruated lane 0x80000000 for int32 positive-overflow

        m_assembler.vpaddd_rrr(scratchFPR2, dest, dest);                    // dest = dest + scratchFPR2 = i[lane]x4 with satruated 0xFFFFFFFF for int32 positive-overflow    
    }

    void vectorTruncSatSignedFloat64(FPRegisterID src, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR)
    {
        // https://github.com/WebAssembly/simd/pull/383
        ASSERT(supportsAVX());
        alignas(16) static constexpr double masks[] = {
            2147483647.0,
            2147483647.0,
        };

        using PackedCompareCondition = X86Assembler::PackedCompareCondition;

        m_assembler.vcmppd_rrr(PackedCompareCondition::EqualAndOrdered, src, src, scratchFPR);
        move(TrustedImmPtr(masks), scratchGPR);
        m_assembler.vandpd_mrr(0, scratchGPR, scratchFPR, scratchFPR);
        m_assembler.vminpd_rrr(scratchFPR, src, dest);
        m_assembler.vcvttpd2dq_rr(dest, dest);
    }

    void vectorTruncSatUnsignedFloat64(FPRegisterID src, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR)
    {
        // https://github.com/WebAssembly/simd/pull/383
        ASSERT(supportsAVX());

        alignas(16) static constexpr double masks[] = {
            4294967295.0,
            4294967295.0,
            0x1.0p+52,
            0x1.0p+52,
        };
        move(TrustedImmPtr(masks), scratchGPR);

        m_assembler.vxorpd_rrr(scratchFPR, scratchFPR, scratchFPR);
        m_assembler.vmaxpd_rrr(scratchFPR, src, dest);
        m_assembler.vminpd_mrr(0, scratchGPR, dest, dest);
        m_assembler.vroundpd_rr(dest, dest, RoundingType::TowardZero);
        m_assembler.vaddpd_mrr(sizeof(double) * 2, scratchGPR, dest, dest);
        m_assembler.vshufps_i8rrr(0x88, scratchFPR, dest, dest);
    }

    void vectorNearest(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vroundps_rr(input, dest, RoundingType::ToNearestWithTiesToEven);
        else
            m_assembler.vroundpd_rr(input, dest, RoundingType::ToNearestWithTiesToEven);
    }

    void vectorSqrt(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        ASSERT(scalarTypeIsFloatingPoint(simdInfo.lane));
        if (simdInfo.lane == SIMDLane::f32x4)
            m_assembler.vsqrtps_rr(input, dest);
        else
            m_assembler.vsqrtpd_rr(input, dest);
    }

    void vectorExtendLow(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        switch (simdInfo.lane) {
        case SIMDLane::i16x8:
            if (simdInfo.signMode == SIMDSignMode::Signed) {
                if (supportsAVX())
                    m_assembler.vpmovsxbw_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovsxbw(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            } else {
                if (supportsAVX())
                    m_assembler.vpmovzxbw_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovzxbw(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            }
            return;
        case SIMDLane::i32x4:
            if (simdInfo.signMode == SIMDSignMode::Signed) {
                if (supportsAVX())
                    m_assembler.vpmovsxwd_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovsxwd(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            } else {
                if (supportsAVX())
                    m_assembler.vpmovzxwd_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovzxwd(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            }
            return;
        case SIMDLane::i64x2:
            if (simdInfo.signMode == SIMDSignMode::Signed) {
                if (supportsAVX())
                    m_assembler.vpmovsxdq_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovsxdq(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            } else {
                if (supportsAVX())
                    m_assembler.vpmovzxdq_rr(input, dest);
                else if (supportsSSE4_1())
                    m_assembler.pmovzxdq(input, dest);
                else
                    RELEASE_ASSERT_NOT_REACHED();
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorExtendHigh(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vunpckhpd_rrr(dest, input, dest);
        else {
            if (input != dest)
                m_assembler.movapd_rr(input, dest);
            m_assembler.shufpd_i8rr(1, dest, dest);
        }
        vectorExtendLow(simdInfo, dest, dest);
    }

    void vectorPromote(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        ASSERT_UNUSED(simdInfo, simdInfo.lane == SIMDLane::f32x4);
        ASSERT(supportsAVX());
        m_assembler.vcvtps2pd_rr(input, dest);
    }

    void vectorDemote(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        ASSERT_UNUSED(simdInfo, simdInfo.lane == SIMDLane::f64x2);
        ASSERT(supportsAVX());
        m_assembler.vcvtpd2ps_rr(input, dest);
    }

    void vectorNarrow(SIMDInfo simdInfo, FPRegisterID lower, FPRegisterID upper, FPRegisterID dest, FPRegisterID)
    {
        ASSERT(simdInfo.signMode != SIMDSignMode::None);
        ASSERT(scalarTypeIsIntegral(simdInfo.lane));

        switch (simdInfo.lane) {
        case SIMDLane::i16x8:
            if (simdInfo.signMode == SIMDSignMode::Signed) {
                if (supportsAVX())
                    m_assembler.vpacksswb_rrr(upper, lower, dest);
                else {
                    if (lower != dest)
                        m_assembler.movapd_rr(lower, dest);
                    m_assembler.packsswb_rr(upper, dest);
                }
            } else {
                if (supportsAVX())
                    m_assembler.vpackuswb_rrr(upper, lower, dest);
                else {
                    if (lower != dest)
                        m_assembler.movapd_rr(lower, dest);
                    m_assembler.packuswb_rr(upper, dest);
                }
            }
            return;
        case SIMDLane::i32x4:
            if (simdInfo.signMode == SIMDSignMode::Signed) {
                if (supportsAVX())
                    m_assembler.vpackssdw_rrr(upper, lower, dest);
                else {
                    if (lower != dest)
                        m_assembler.movapd_rr(lower, dest);
                    m_assembler.packssdw_rr(upper, dest);
                }
            } else {
                if (supportsAVX())
                    m_assembler.vpackusdw_rrr(upper, lower, dest);
                else if (supportsSSE4_1()) {
                    if (lower != dest)
                        m_assembler.movapd_rr(lower, dest);
                    m_assembler.packusdw_rr(upper, dest);
                } else
                    RELEASE_ASSERT_NOT_REACHED();
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorConvert(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID dest)
    {
        ASSERT_UNUSED(simdInfo, scalarTypeIsIntegral(simdInfo.lane));
        ASSERT(elementByteSize(simdInfo.lane) == 4);
        ASSERT(simdInfo.signMode == SIMDSignMode::Signed);
        if (supportsAVX())
            m_assembler.vcvtdq2ps_rr(input, dest);
        else
            m_assembler.cvtdq2ps_rr(input, dest);
    }

    void vectorConvertUnsigned(FPRegisterID src, FPRegisterID dst, FPRegisterID scratch)
    {
        ASSERT(supportsAVX());
        m_assembler.vpxor_rrr(scratch, scratch, scratch);           // clear scratch
        m_assembler.vpblendw_i8rrr(0x55, src, scratch, scratch);    // i_low = low 16 bits of src
        m_assembler.vpsubd_rrr(scratch, src, dst);                  // i_high = high 16 bits of src
        m_assembler.vcvtdq2ps_rr(scratch, scratch);                 // f_low = convertToF32(i_low)
        m_assembler.vpsrld_i8rr(1, dst, dst);                       // i_half_high = i_high / 2
        m_assembler.vcvtdq2ps_rr(dst, dst);                         // f_half_high = convertToF32(i_half_high)
        m_assembler.vaddps_rrr(dst, dst, dst);                      // dst = f_half_high + f_half_high + f_low
        m_assembler.vaddps_rrr(scratch, dst, dst);
    }

    void vectorConvertLowUnsignedInt32(FPRegisterID input, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR)
    {
        // https://github.com/WebAssembly/simd/pull/383
        ASSERT(supportsAVX());
        ASSERT(scratchFPR != dest);
        constexpr uint32_t high32Bits = 0x43300000;
        alignas(16) static constexpr double masks[] = {
            0x1.0p+52,
            0x1.0p+52,
        };
        move(TrustedImm32(high32Bits), scratchGPR);
        vectorSplatInt32(scratchGPR, scratchFPR);
        m_assembler.vunpcklps_rrr(scratchFPR, input, dest);
        move(TrustedImmPtr(masks), scratchGPR);
        loadVector(Address(scratchGPR), scratchFPR);
        m_assembler.vsubpd_rrr(scratchFPR, dest, dest);
    }

    void vectorConvertLowSignedInt32(FPRegisterID input, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vcvtdq2pd_rr(input, dest);
        else
            m_assembler.cvtdq2pd_rr(input, dest);
    }

    void vectorUshl(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID shift, FPRegisterID dest)
    {
        ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(supportsAVX());
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            // FIXME: 8-bit shift is awful on intel.
            break;
        case SIMDLane::i16x8:
            m_assembler.vpsllw_rrr(shift, input, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpslld_rrr(shift, input, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpsllq_rrr(shift, input, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid lane kind for unsigned vector left shift.");
        }
    }

    void vectorUshl8(FPRegisterID input, FPRegisterID shift, FPRegisterID dest, FPRegisterID tmp1, FPRegisterID tmp2)
    {
        RELEASE_ASSERT(supportsAVX());

        // Unpack and zero-extend low input bytes.
        m_assembler.vxorps_rrr(tmp2, tmp2, tmp2);
        m_assembler.vpunpcklbw_rrr(input, tmp2, tmp1);

        // Word-wise shift low input bytes into tmp1.
        m_assembler.vpsllw_rrr(shift, tmp1, tmp1);

        // Unpack and zero-extend high input bytes.
        m_assembler.vpunpckhbw_rrr(input, tmp2, tmp2);

        // Word-wise shift high input bytes into tmp2.
        m_assembler.vpsllw_rrr(shift, tmp2, tmp2);

        // Mask away higher bits of left-shifted results.
        m_assembler.vpsllw_i8rr(8, tmp1, tmp1);
        m_assembler.vpsllw_i8rr(8, tmp2, tmp2);
        m_assembler.vpsrlw_i8rr(8, tmp1, tmp1);
        m_assembler.vpsrlw_i8rr(8, tmp2, tmp2);

        // Pack low and high results into destination.
        m_assembler.vpackuswb_rrr(tmp2, tmp1, dest);
    }

    void vectorUshr8(FPRegisterID input, FPRegisterID shift, FPRegisterID dest, FPRegisterID tmp1, FPRegisterID tmp2)
    {
        RELEASE_ASSERT(supportsAVX());

        // Unpack and zero-extend low input bytes.
        m_assembler.vxorps_rrr(tmp2, tmp2, tmp2);
        m_assembler.vpunpcklbw_rrr(input, tmp2, tmp1);

        // Word-wise shift low input bytes into tmp1.
        m_assembler.vpsrlw_rrr(shift, tmp1, tmp1);

        // Unpack and zero-extend high input bytes.
        m_assembler.vpunpckhbw_rrr(input, tmp2, tmp2);

        // Word-wise shift high input bytes into tmp2.
        m_assembler.vpsrlw_rrr(shift, tmp2, tmp2);

        // Pack low and high results into destination.
        m_assembler.vpackuswb_rrr(tmp2, tmp1, dest);
    }

    void vectorSshr8(FPRegisterID input, FPRegisterID shift, FPRegisterID dest, FPRegisterID tmp1, FPRegisterID tmp2)
    {
        RELEASE_ASSERT(supportsAVX());

        // Unpack and zero-extend low input bytes.
        m_assembler.vpmovsxbw_rr(input, tmp1);

        // Word-wise shift low input bytes into tmp1.
        m_assembler.vpsraw_rrr(shift, tmp1, tmp1);

        // Unpack and sign-extend high input bytes.
        m_assembler.vpshufd_i8rr(0b00001110, input, tmp2);
        m_assembler.vpmovsxbw_rr(tmp2, tmp2);

        // Word-wise shift high input bytes into tmp2.
        m_assembler.vpsraw_rrr(shift, tmp2, tmp2);

        // Pack low and high results into destination.
        m_assembler.vpacksswb_rrr(tmp2, tmp1, dest);
    }

    void vectorSshr8(SIMDInfo simdInfo, FPRegisterID input, TrustedImm32 shift, FPRegisterID dest)
    {
        RELEASE_ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(simdInfo.lane != SIMDLane::i8x16);
        RELEASE_ASSERT(supportsAVX());
        switch (simdInfo.lane) {
        case SIMDLane::i16x8:
            m_assembler.vpsraw_i8rr(shift.m_value, input, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpsrad_i8rr(shift.m_value, input, dest);
            break;
        case SIMDLane::i64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64x2 signed shift right is not supported natively on Intel.");
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid lane kind for signed vector right shift.");
        }
    }

    void vectorUshr8(SIMDInfo simdInfo, FPRegisterID input, TrustedImm32 shift, FPRegisterID dest)
    {
        RELEASE_ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(simdInfo.lane != SIMDLane::i8x16);
        RELEASE_ASSERT(supportsAVX());
        switch (simdInfo.lane) {
        case SIMDLane::i16x8:
            m_assembler.vpsrlw_i8rr(shift.m_value, input, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpsrld_i8rr(shift.m_value, input, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpsrlq_i8rr(shift.m_value, input, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid lane kind for unsigned vector right shift.");
        }
    }

    void vectorUshr(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID shift, FPRegisterID dest)
    {
        ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(supportsAVX());
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            // FIXME: 8-bit shift is awful on intel.
            break;
        case SIMDLane::i16x8:
            m_assembler.vpsrlw_rrr(shift, input, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpsrld_rrr(shift, input, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpsrlq_rrr(shift, input, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid lane kind for unsigned vector right shift.");
        }
    }

    void vectorSshr(SIMDInfo simdInfo, FPRegisterID input, FPRegisterID shift, FPRegisterID dest)
    {
        ASSERT(scalarTypeIsIntegral(simdInfo.lane));
        RELEASE_ASSERT(supportsAVX());
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            // FIXME: 8-bit shift is awful on intel.
            break;
        case SIMDLane::i16x8:
            m_assembler.vpsraw_rrr(shift, input, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpsrad_rrr(shift, input, dest);
            break;
        case SIMDLane::i64x2:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("i64x2 signed shift right is not supported natively on Intel.");
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid lane kind for unsigned vector right shift.");
        }
    }

    void vectorSplatAVX(SIMDLane lane, RegisterID src, FPRegisterID dest)
    {
        m_assembler.vmovq_rr(src, dest);
        switch (lane) {
        case SIMDLane::i64x2:
            m_assembler.vmovddup_rr(dest, dest);
            return;
        case SIMDLane::i32x4:
            m_assembler.vshufps_i8rrr(0, dest, dest, dest);
            return;
        case SIMDLane::i8x16:
            vectorReplaceLane(SIMDLane::i8x16, TrustedImm32(1), src, dest);
            FALLTHROUGH;
        case SIMDLane::i16x8:
            m_assembler.vpshuflw_i8rr(0, dest, dest);
            m_assembler.vpunpcklqdq_rrr(dest, dest, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorSplat(SIMDLane lane, RegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            return vectorSplatAVX(lane, src, dest);

        m_assembler.movq_rr(src, dest);
        switch (lane) {
        case SIMDLane::i64x2:
            if (supportsSSE3())
                m_assembler.movddup_rr(dest, dest);
            else
                m_assembler.shufpd_i8rr(0, dest, dest);
            return;
        case SIMDLane::i32x4:
            m_assembler.shufps_i8rr(0, dest, dest);
            return;
        case SIMDLane::i8x16:
            vectorReplaceLane(SIMDLane::i8x16, TrustedImm32(1), src, dest);
            FALLTHROUGH;
        case SIMDLane::i16x8:
            m_assembler.pshuflw_i8rr(0, dest, dest);
            m_assembler.punpcklqdq_rr(dest, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorSplatAVX(SIMDLane lane, FPRegisterID src, FPRegisterID dest)
    {
        switch (lane) {
        case SIMDLane::f32x4:
            if (src != dest)
                m_assembler.vpshufd_i8rr(0, src, dest);
            else {
                ASSERT(src == dest);
                m_assembler.vshufps_i8rrr(0, dest, dest, dest);
            }
            return;
        case SIMDLane::f64x2:
            m_assembler.vmovddup_rr(src, dest);
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorSplat(SIMDLane lane, FPRegisterID src, FPRegisterID dest)
    {
        if (supportsAVX())
            return vectorSplatAVX(lane, src, dest);

        switch (lane) {
        case SIMDLane::f32x4:
            if (src != dest)
                m_assembler.pshufd_i8rr(0, src, dest);
            else {
                ASSERT(src == dest);
                m_assembler.shufps_i8rr(0, dest, dest);
            }
            return;
        case SIMDLane::f64x2:
            if (supportsSSE3())
                m_assembler.movddup_rr(src, dest);
            else {
                if (src != dest)
                    m_assembler.movapd_rr(src, dest);
                m_assembler.shufpd_i8rr(0, dest, dest);
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorSplatInt8(RegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::i8x16, src, dest); }
    void vectorSplatInt16(RegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::i16x8, src, dest); }
    void vectorSplatInt32(RegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::i32x4, src, dest); }
    void vectorSplatInt64(RegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::i64x2, src, dest); }
    void vectorSplatFloat32(FPRegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::f32x4, src, dest); }
    void vectorSplatFloat64(FPRegisterID src, FPRegisterID dest) { vectorSplat(SIMDLane::f64x2, src, dest); }

    void vectorAddSat(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        ASSERT(simdInfo.signMode != SIMDSignMode::None);

        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpaddsb_rrr(right, left, dest);
                else
                    m_assembler.vpaddusb_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.paddsb_rr(right, dest);
                else
                    m_assembler.paddusb_rr(right, dest);
            }
            return;
        case SIMDLane::i16x8:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpaddsw_rrr(right, left, dest);
                else
                    m_assembler.vpaddusw_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.paddsw_rr(right, dest);
                else
                    m_assembler.paddusw_rr(right, dest);
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorSubSat(SIMDInfo simdInfo, FPRegisterID left, FPRegisterID right, FPRegisterID dest)
    {
        ASSERT(scalarTypeIsIntegral(simdInfo.lane));

        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpsubsb_rrr(right, left, dest);
                else
                    m_assembler.vpsubusb_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.psubsb_rr(right, dest);
                else
                    m_assembler.psubusb_rr(right, dest);
            }
            return;
        case SIMDLane::i16x8:
            if (supportsAVX()) {
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.vpsubsw_rrr(right, left, dest);
                else
                    m_assembler.vpsubusw_rrr(right, left, dest);
            } else {
                if (left != dest)
                    m_assembler.movapd_rr(left, dest);
                if (simdInfo.signMode == SIMDSignMode::Signed)
                    m_assembler.psubsw_rr(right, dest);
                else
                    m_assembler.psubusw_rr(right, dest);
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorLoad8Splat(Address address, FPRegisterID dest, FPRegisterID scratch)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrb_i8mrr(0, address.offset, address.base, dest, dest);
        m_assembler.vpxor_rrr(scratch, scratch, scratch);
        m_assembler.vpshufb_rrr(scratch, dest, dest);
    }

    void vectorLoad16Splat(Address address, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrw_i8mrr(0, address.offset, address.base, dest, dest);
        m_assembler.vpshuflw_i8rr(0, dest, dest);
        m_assembler.vpunpcklqdq_rrr(dest, dest, dest);
    }

    void vectorLoad32Splat(Address address, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vbroadcastss_mr(address.offset, address.base, dest);
    }

    void vectorLoad64Splat(Address address, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vmovddup_mr(address.offset, address.base, dest);
    }

    void vectorLoad8Lane(Address address, TrustedImm32 imm, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrb_i8mrr(imm.m_value, address.offset, address.base, dest, dest);
    }

    void vectorLoad16Lane(Address address, TrustedImm32 imm, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrw_i8mrr(imm.m_value, address.offset, address.base, dest, dest);
    }

    void vectorLoad32Lane(Address address, TrustedImm32 imm, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrd_i8mrr(imm.m_value, address.offset, address.base, dest, dest);
    }

    void vectorLoad64Lane(Address address, TrustedImm32 imm, FPRegisterID dest)
    {
        ASSERT(supportsAVX());
        m_assembler.vpinsrq_i8mrr(imm.m_value, address.offset, address.base, dest, dest);
    }

    void vectorStore8Lane(FPRegisterID src, Address address, TrustedImm32 imm)
    {
        ASSERT(supportsAVX());
        m_assembler.vpextrb_i8rm(imm.m_value, src, address.base, address.offset);
    }

    void vectorStore16Lane(FPRegisterID src, Address address, TrustedImm32 imm)
    {
        ASSERT(supportsAVX());
        m_assembler.vpextrw_i8rm(imm.m_value, src, address.base, address.offset);
    }

    void vectorStore32Lane(FPRegisterID src, Address address, TrustedImm32 imm)
    {
        ASSERT(supportsAVX());
        m_assembler.vpextrd_i8rm(imm.m_value, src, address.base, address.offset);
    }

    void vectorStore64Lane(FPRegisterID src, Address address, TrustedImm32 imm)
    {
        ASSERT(supportsAVX());
        m_assembler.vpextrq_i8rm(imm.m_value, src, address.base, address.offset);
    }

    void vectorAnyTrue(FPRegisterID vec, RegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        m_assembler.vptest_rr(vec, vec);
        m_assembler.setCC_r(x86Condition(NonZero), dest);
        m_assembler.movzbl_rr(dest, dest);
    }

    void vectorAllTrue(SIMDInfo simdInfo, FPRegisterID vec, RegisterID dest, FPRegisterID scratch)
    {
        RELEASE_ASSERT(supportsAVX());

        m_assembler.vpxor_rrr(scratch, scratch, scratch); // Zero scratch register.
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            m_assembler.vpcmpeqb_rrr(vec, scratch, scratch);
            break;
        case SIMDLane::i16x8:
            m_assembler.vpcmpeqw_rrr(vec, scratch, scratch);
            break;
        case SIMDLane::i32x4:
            m_assembler.vpcmpeqd_rrr(vec, scratch, scratch);
            break;
        case SIMDLane::i64x2:
            m_assembler.vpcmpeqq_rrr(vec, scratch, scratch);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector all-true.");
        }
        m_assembler.vptest_rr(scratch, scratch);
        m_assembler.setCC_r(x86Condition(RelationalCondition::Equal), dest);
        m_assembler.movzbl_rr(dest, dest);
    }

    void vectorBitmask(SIMDInfo simdInfo, FPRegisterID vec, RegisterID dest, FPRegisterID tmp)
    {
        RELEASE_ASSERT(supportsAVX());

        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            m_assembler.vpmovmskb_rr(vec, dest);
            break;
        case SIMDLane::i16x8:
            m_assembler.vpxor_rrr(tmp, tmp, tmp);
            m_assembler.vpacksswb_rrr(tmp, vec, tmp);
            m_assembler.vpmovmskb_rr(tmp, dest);
            break;
        case SIMDLane::i32x4:
            m_assembler.vmovmskps_rr(vec, dest);
            break;
        case SIMDLane::i64x2:
            m_assembler.vmovmskpd_rr(vec, dest);
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED_WITH_MESSAGE("Invalid SIMD lane for vector bitmask.");
        }
    }

    void vectorExtaddPairwise(SIMDInfo simdInfo, FPRegisterID vec, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR)
    {
        RELEASE_ASSERT(supportsAVX());

        // https://github.com/WebAssembly/simd/pull/380
        move(TrustedImm64(1), scratchGPR);
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            vectorSplatInt8(scratchGPR, scratchFPR);
            if (simdInfo.signMode == SIMDSignMode::Signed)
                m_assembler.vpmaddubsw_rrr(vec, scratchFPR, dest);
            else
                m_assembler.vpmaddubsw_rrr(scratchFPR, vec, dest);
            return;
        case SIMDLane::i16x8:
            vectorSplatInt16(scratchGPR, scratchFPR);
            if (simdInfo.signMode == SIMDSignMode::Signed)
                m_assembler.vpmaddwd_rrr(vec, scratchFPR, dest);
            else
                RELEASE_ASSERT_NOT_REACHED();
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorExtaddPairwiseUnsignedInt16(FPRegisterID src, FPRegisterID dest, FPRegisterID scratch)
    {
        RELEASE_ASSERT(supportsAVX());
        // It can be src == dest.
        ASSERT(dest != scratch);
        ASSERT(src != scratch);
        m_assembler.vpsrld_i8rr(16, src, scratch);
        m_assembler.vpblendw_i8rrr(0xAA, scratch, src, dest);
        m_assembler.vpaddd_rrr(scratch, dest, dest);
    }

    void vectorAvgRound(SIMDInfo simdInfo, FPRegisterID a, FPRegisterID b, FPRegisterID dest)
    {
        switch (simdInfo.lane) {
        case SIMDLane::i8x16:
            if (supportsAVX())
                m_assembler.vpavgb_rrr(b, a, dest);
            else {
                if (a != dest)
                    m_assembler.movapd_rr(a, dest);
                m_assembler.pavgb_rr(b, dest);
            }
            return;
        case SIMDLane::i16x8:
            if (supportsAVX())
                m_assembler.vpavgw_rrr(b, a, dest);
            else {
                if (a != dest)
                    m_assembler.movapd_rr(a, dest);
                m_assembler.pavgw_rr(b, dest);
            }
            return;
        default:
            RELEASE_ASSERT_NOT_REACHED();
        }
    }

    void vectorMulSat(FPRegisterID a, FPRegisterID b, FPRegisterID dest, RegisterID scratchGPR, FPRegisterID scratchFPR)
    {
        // https://github.com/WebAssembly/simd/pull/365
        if (supportsAVX()) {
            m_assembler.vpmulhrsw_rrr(b, a, dest);
            m_assembler.movq_i64r(0x8000, scratchGPR);
            vectorSplat(SIMDLane::i16x8, scratchGPR, scratchFPR);
            m_assembler.vpcmpeqw_rrr(scratchFPR, dest, scratchFPR);
            m_assembler.vpxor_rrr(scratchFPR, dest, dest);
        } else if (supportsSupplementalSSE3())
            RELEASE_ASSERT_NOT_REACHED();
        else
            RELEASE_ASSERT_NOT_REACHED();
    }

    void vectorSwizzle(FPRegisterID a, FPRegisterID b, FPRegisterID dest)
    {
        if (supportsAVX())
            m_assembler.vpshufb_rrr(b, a, dest);
        else {
            if (a != dest)
                m_assembler.movapd_rr(a, dest);
            m_assembler.pshufb_rr(b, dest);
        }
    }

    void vectorDotProduct(FPRegisterID a, FPRegisterID b, FPRegisterID dest)
    {
        RELEASE_ASSERT(supportsAVX());
        m_assembler.vpmaddwd_rrr(b, a, dest);
    }

    // Misc helper functions.

    static bool supportsFloatingPoint() { return true; }
    static bool supportsFloatingPointTruncate() { return true; }
    static bool supportsFloatingPointSqrt() { return true; }
    static bool supportsFloatingPointAbs() { return true; }

    template<PtrTag resultTag, PtrTag locationTag>
    static CodePtr<resultTag> readCallTarget(CodeLocationCall<locationTag> call)
    {
        return CodePtr<resultTag>(X86Assembler::readPointer(call.dataLabelPtrAtOffset(-REPATCH_OFFSET_CALL_R11).dataLocation()));
    }

    bool haveScratchRegisterForBlinding() { return m_allowScratchRegister; }
    RegisterID scratchRegisterForBlinding() { return scratchRegister(); }

    static bool canJumpReplacePatchableBranchPtrWithPatch() { return true; }
    static bool canJumpReplacePatchableBranch32WithPatch() { return true; }

    template<PtrTag tag>
    static CodeLocationLabel<tag> startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr<tag> label)
    {
        const int rexBytes = 1;
        const int opcodeBytes = 1;
        const int immediateBytes = 8;
        const int totalBytes = rexBytes + opcodeBytes + immediateBytes;
        ASSERT(totalBytes >= maxJumpReplacementSize());
        return label.labelAtOffset(-totalBytes);
    }

    template<PtrTag tag>
    static CodeLocationLabel<tag> startOfBranch32WithPatchOnRegister(CodeLocationDataLabel32<tag> label)
    {
        const int rexBytes = 1;
        const int opcodeBytes = 1;
        const int immediateBytes = 4;
        const int totalBytes = rexBytes + opcodeBytes + immediateBytes;
        ASSERT(totalBytes >= maxJumpReplacementSize());
        return label.labelAtOffset(-totalBytes);
    }

    template<PtrTag tag>
    static CodeLocationLabel<tag> startOfPatchableBranchPtrWithPatchOnAddress(CodeLocationDataLabelPtr<tag> label)
    {
        return startOfBranchPtrWithPatchOnRegister(label);
    }

    template<PtrTag tag>
    static CodeLocationLabel<tag> startOfPatchableBranch32WithPatchOnAddress(CodeLocationDataLabel32<tag> label)
    {
        return startOfBranch32WithPatchOnRegister(label);
    }

    template<PtrTag tag>
    static void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel<tag> instructionStart, Address, void* initialValue)
    {
        X86Assembler::revertJumpTo_movq_i64r(instructionStart.taggedPtr(), reinterpret_cast<intptr_t>(initialValue), s_scratchRegister);
    }

    template<PtrTag tag>
    static void revertJumpReplacementToPatchableBranch32WithPatch(CodeLocationLabel<tag> instructionStart, Address, int32_t initialValue)
    {
        X86Assembler::revertJumpTo_movl_i32r(instructionStart.taggedPtr(), initialValue, s_scratchRegister);
    }

    template<PtrTag tag>
    static void revertJumpReplacementToBranchPtrWithPatch(CodeLocationLabel<tag> instructionStart, RegisterID, void* initialValue)
    {
        X86Assembler::revertJumpTo_movq_i64r(instructionStart.taggedPtr(), reinterpret_cast<intptr_t>(initialValue), s_scratchRegister);
    }

    template<PtrTag callTag, PtrTag destTag>
    static void repatchCall(CodeLocationCall<callTag> call, CodeLocationLabel<destTag> destination)
    {
        X86Assembler::repatchPointer(call.dataLabelPtrAtOffset(-REPATCH_OFFSET_CALL_R11).dataLocation(), destination.taggedPtr());
    }

    template<PtrTag callTag, PtrTag destTag>
    static void repatchCall(CodeLocationCall<callTag> call, CodePtr<destTag> destination)
    {
        X86Assembler::repatchPointer(call.dataLabelPtrAtOffset(-REPATCH_OFFSET_CALL_R11).dataLocation(), destination.taggedPtr());
    }

private:
    // If lzcnt is not available, use this after BSR
    // to count the leading zeros.
    void clz64AfterBsr(RegisterID dst)
    {
        Jump srcIsNonZero = m_assembler.jCC(x86Condition(NonZero));
        move(TrustedImm32(64), dst);

        Jump skipNonZeroCase = jump();
        srcIsNonZero.link(this);
        xor64(TrustedImm32(0x3f), dst);
        skipNonZeroCase.link(this);
    }

    friend class LinkBuffer;

    template<PtrTag tag>
    static void linkCall(void* code, Call call, CodePtr<tag> function)
    {
        if (!call.isFlagSet(Call::Near))
            X86Assembler::linkPointer(code, call.m_label.labelAtOffset(-REPATCH_OFFSET_CALL_R11), function.taggedPtr());
        else if (call.isFlagSet(Call::Tail))
            X86Assembler::linkJump(code, call.m_label, function.taggedPtr());
        else
            X86Assembler::linkCall(code, call.m_label, function.taggedPtr());
    }
};

} // namespace JSC

#endif // ENABLE(ASSEMBLER)
