/*
 * Copyright (C) 2012-2019 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)

#include "ARM64Assembler.h"
#include "AbstractMacroAssembler.h"
#include <wtf/MathExtras.h>
#include <wtf/Optional.h>

namespace JSC {

using Assembler = TARGET_ASSEMBLER;
class Reg;

class MacroAssemblerARM64 : public AbstractMacroAssembler<Assembler> {
public:
    static constexpr unsigned numGPRs = 32;
    static constexpr unsigned numFPRs = 32;
    
    static constexpr RegisterID dataTempRegister = ARM64Registers::ip0;
    static constexpr RegisterID memoryTempRegister = ARM64Registers::ip1;

    RegisterID scratchRegister()
    {
        RELEASE_ASSERT(m_allowScratchRegister);
        return getCachedDataTempRegisterIDAndInvalidate();
    }

protected:
    static constexpr ARM64Registers::FPRegisterID fpTempRegister = ARM64Registers::q31;
    static constexpr Assembler::SetFlags S = Assembler::S;
    static constexpr int64_t maskHalfWord0 = 0xffffl;
    static constexpr int64_t maskHalfWord1 = 0xffff0000l;
    static constexpr int64_t maskUpperWord = 0xffffffff00000000l;

    static constexpr size_t INSTRUCTION_SIZE = 4;

    // N instructions to load the pointer + 1 call instruction.
    static constexpr ptrdiff_t REPATCH_OFFSET_CALL_TO_POINTER = -((Assembler::MAX_POINTER_BITS / 16 + 1) * INSTRUCTION_SIZE);

public:
    MacroAssemblerARM64()
        : m_dataMemoryTempRegister(this, dataTempRegister)
        , m_cachedMemoryTempRegister(this, memoryTempRegister)
        , m_makeJumpPatchable(false)
    {
    }

    typedef Assembler::LinkRecord LinkRecord;
    typedef Assembler::JumpType JumpType;
    typedef Assembler::JumpLinkType JumpLinkType;
    typedef Assembler::Condition Condition;

    static constexpr Assembler::Condition DefaultCondition = Assembler::ConditionInvalid;
    static constexpr Assembler::JumpType DefaultJump = Assembler::JumpNoConditionFixedSize;

    Vector<LinkRecord, 0, UnsafeVectorOverflow>& jumpsToLink() { return m_assembler.jumpsToLink(); }
    static bool canCompact(JumpType jumpType) { return Assembler::canCompact(jumpType); }
    static JumpLinkType computeJumpType(JumpType jumpType, const uint8_t* from, const uint8_t* to) { return Assembler::computeJumpType(jumpType, from, to); }
    static JumpLinkType computeJumpType(LinkRecord& record, const uint8_t* from, const uint8_t* to) { return Assembler::computeJumpType(record, from, to); }
    static int jumpSizeDelta(JumpType jumpType, JumpLinkType jumpLinkType) { return Assembler::jumpSizeDelta(jumpType, jumpLinkType); }
    template <Assembler::CopyFunction copy>
    static void link(LinkRecord& record, uint8_t* from, const uint8_t* fromInstruction, uint8_t* to) { return Assembler::link<copy>(record, from, fromInstruction, to); }

    static constexpr Scale ScalePtr = TimesEight;

    static bool isCompactPtrAlignedAddressOffset(ptrdiff_t value)
    {
        // This is the largest 32-bit access allowed, aligned to 64-bit boundary.
        return !(value & ~0x3ff8);
    }

    enum RelationalCondition {
        Equal = Assembler::ConditionEQ,
        NotEqual = Assembler::ConditionNE,
        Above = Assembler::ConditionHI,
        AboveOrEqual = Assembler::ConditionHS,
        Below = Assembler::ConditionLO,
        BelowOrEqual = Assembler::ConditionLS,
        GreaterThan = Assembler::ConditionGT,
        GreaterThanOrEqual = Assembler::ConditionGE,
        LessThan = Assembler::ConditionLT,
        LessThanOrEqual = Assembler::ConditionLE
    };

    enum ResultCondition {
        Overflow = Assembler::ConditionVS,
        Signed = Assembler::ConditionMI,
        PositiveOrZero = Assembler::ConditionPL,
        Zero = Assembler::ConditionEQ,
        NonZero = Assembler::ConditionNE
    };

    enum ZeroCondition {
        IsZero = Assembler::ConditionEQ,
        IsNonZero = Assembler::ConditionNE
    };

    enum DoubleCondition {
        // These conditions will only evaluate to true if the comparison is ordered - i.e. neither operand is NaN.
        DoubleEqualAndOrdered = Assembler::ConditionEQ,
        DoubleNotEqualAndOrdered = Assembler::ConditionVC, // Not the right flag! check for this & handle differently.
        DoubleGreaterThanAndOrdered = Assembler::ConditionGT,
        DoubleGreaterThanOrEqualAndOrdered = Assembler::ConditionGE,
        DoubleLessThanAndOrdered = Assembler::ConditionLO,
        DoubleLessThanOrEqualAndOrdered = Assembler::ConditionLS,
        // If either operand is NaN, these conditions always evaluate to true.
        DoubleEqualOrUnordered = Assembler::ConditionVS, // Not the right flag! check for this & handle differently.
        DoubleNotEqualOrUnordered = Assembler::ConditionNE,
        DoubleGreaterThanOrUnordered = Assembler::ConditionHI,
        DoubleGreaterThanOrEqualOrUnordered = Assembler::ConditionHS,
        DoubleLessThanOrUnordered = Assembler::ConditionLT,
        DoubleLessThanOrEqualOrUnordered = Assembler::ConditionLE,
    };

    static constexpr RegisterID stackPointerRegister = ARM64Registers::sp;
    static constexpr RegisterID framePointerRegister = ARM64Registers::fp;
    static constexpr RegisterID linkRegister = ARM64Registers::lr;

    // FIXME: Get reasonable implementations for these
    static bool shouldBlindForSpecificArch(uint32_t value) { return value >= 0x00ffffff; }
    static bool shouldBlindForSpecificArch(uint64_t value) { return value >= 0x00ffffff; }

    // Integer operations:

    void add32(RegisterID a, RegisterID b, RegisterID dest)
    {
        ASSERT(a != ARM64Registers::sp && b != ARM64Registers::sp);
        m_assembler.add<32>(dest, a, b);
    }

    void add32(RegisterID src, RegisterID dest)
    {
        m_assembler.add<32>(dest, dest, src);
    }

    void add32(TrustedImm32 imm, RegisterID dest)
    {
        add32(imm, dest, dest);
    }

    void add32(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        if (isUInt12(imm.m_value))
            m_assembler.add<32>(dest, src, UInt12(imm.m_value));
        else if (isUInt12(-imm.m_value))
            m_assembler.sub<32>(dest, src, UInt12(-imm.m_value));
        else if (src != dest) {
            move(imm, dest);
            add32(src, dest);
        } else {
            move(imm, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.add<32>(dest, src, dataTempRegister);
        }
    }

    void add32(TrustedImm32 imm, Address address)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value))
            m_assembler.add<32>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
        else if (isUInt12(-imm.m_value))
            m_assembler.sub<32>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
        else {
            move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
            m_assembler.add<32>(dataTempRegister, dataTempRegister, memoryTempRegister);
        }

        store32(dataTempRegister, address);
    }

    void add32(TrustedImm32 imm, AbsoluteAddress address)
    {
        load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value)) {
            m_assembler.add<32>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
            store32(dataTempRegister, address.m_ptr);
            return;
        }

        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<32>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
            store32(dataTempRegister, address.m_ptr);
            return;
        }

        move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<32>(dataTempRegister, dataTempRegister, memoryTempRegister);
        store32(dataTempRegister, address.m_ptr);
    }

    void add32(Address src, RegisterID dest)
    {
        load32(src, getCachedDataTempRegisterIDAndInvalidate());
        add32(dataTempRegister, dest);
    }

    void add64(RegisterID a, RegisterID b, RegisterID dest)
    {
        ASSERT(a != ARM64Registers::sp || b != ARM64Registers::sp);
        if (b == ARM64Registers::sp)
            std::swap(a, b);
        m_assembler.add<64>(dest, a, b);
    }

    void add64(RegisterID src, RegisterID dest)
    {
        if (src == ARM64Registers::sp)
            m_assembler.add<64>(dest, src, dest);
        else
            m_assembler.add<64>(dest, dest, src);
    }

    void add64(TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.add<64>(dest, dest, UInt12(imm.m_value));
            return;
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<64>(dest, dest, UInt12(-imm.m_value));
            return;
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dest, dest, dataTempRegister);
    }

    void add64(TrustedImm64 imm, RegisterID dest)
    {
        intptr_t immediate = imm.m_value;

        if (isUInt12(immediate)) {
            m_assembler.add<64>(dest, dest, UInt12(static_cast<int32_t>(immediate)));
            return;
        }
        if (isUInt12(-immediate)) {
            m_assembler.sub<64>(dest, dest, UInt12(static_cast<int32_t>(-immediate)));
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dest, dest, dataTempRegister);
    }

    void add64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.add<64>(dest, src, UInt12(imm.m_value));
            return;
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<64>(dest, src, UInt12(-imm.m_value));
            return;
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dest, src, dataTempRegister);
    }

    void add64(TrustedImm32 imm, Address address)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value))
            m_assembler.add<64>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
        else if (isUInt12(-imm.m_value))
            m_assembler.sub<64>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
        else {
            signExtend32ToPtr(imm, getCachedMemoryTempRegisterIDAndInvalidate());
            m_assembler.add<64>(dataTempRegister, dataTempRegister, memoryTempRegister);
        }

        store64(dataTempRegister, address);
    }

    void add64(TrustedImm32 imm, AbsoluteAddress address)
    {
        load64(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value)) {
            m_assembler.add<64>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
            store64(dataTempRegister, address.m_ptr);
            return;
        }

        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<64>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
            store64(dataTempRegister, address.m_ptr);
            return;
        }

        signExtend32ToPtr(imm, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dataTempRegister, dataTempRegister, memoryTempRegister);
        store64(dataTempRegister, address.m_ptr);
    }

    void addPtrNoFlags(TrustedImm32 imm, RegisterID srcDest)
    {
        add64(imm, srcDest);
    }

    void add64(Address src, RegisterID dest)
    {
        load64(src, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dest, dest, dataTempRegister);
    }

    void add64(AbsoluteAddress src, RegisterID dest)
    {
        load64(src.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.add<64>(dest, dest, dataTempRegister);
    }

    void and32(RegisterID src, RegisterID dest)
    {
        and32(dest, src, dest);
    }

    void and32(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.and_<32>(dest, op1, op2);
    }

    void and32(TrustedImm32 imm, RegisterID dest)
    {
        and32(imm, dest, dest);
    }

    void and32(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create32(imm.m_value);

        if (logicalImm.isValid()) {
            m_assembler.and_<32>(dest, src, logicalImm);
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.and_<32>(dest, src, dataTempRegister);
    }

    void and32(Address src, RegisterID dest)
    {
        load32(src, getCachedDataTempRegisterIDAndInvalidate());
        and32(dataTempRegister, dest);
    }

    void and16(Address src, RegisterID dest)
    {
        load16(src, getCachedDataTempRegisterIDAndInvalidate());
        and32(dataTempRegister, dest);
    }

    void and64(RegisterID src1, RegisterID src2, RegisterID dest)
    {
        m_assembler.and_<64>(dest, src1, src2);
    }

    void and64(TrustedImm64 imm, RegisterID src, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(imm.m_value);

        if (logicalImm.isValid()) {
            m_assembler.and_<64>(dest, src, logicalImm);
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.and_<64>(dest, src, dataTempRegister);
    }

    void and64(RegisterID src, RegisterID dest)
    {
        m_assembler.and_<64>(dest, dest, src);
    }

    void and64(TrustedImm32 imm, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(static_cast<intptr_t>(static_cast<int64_t>(imm.m_value)));

        if (logicalImm.isValid()) {
            m_assembler.and_<64>(dest, dest, logicalImm);
            return;
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.and_<64>(dest, dest, dataTempRegister);
    }

    void and64(TrustedImmPtr imm, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(reinterpret_cast<uint64_t>(imm.m_value));

        if (logicalImm.isValid()) {
            m_assembler.and_<64>(dest, dest, logicalImm);
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.and_<64>(dest, dest, dataTempRegister);
    }
    
    void countLeadingZeros32(RegisterID src, RegisterID dest)
    {
        m_assembler.clz<32>(dest, src);
    }

    void countLeadingZeros64(RegisterID src, RegisterID dest)
    {
        m_assembler.clz<64>(dest, src);
    }

    void countTrailingZeros32(RegisterID src, RegisterID dest)
    {
        // Arm does not have a count trailing zeros only a count leading zeros.
        m_assembler.rbit<32>(dest, src);
        m_assembler.clz<32>(dest, dest);
    }

    void countTrailingZeros64(RegisterID src, RegisterID dest)
    {
        // Arm does not have a count trailing zeros only a count leading zeros.
        m_assembler.rbit<64>(dest, src);
        m_assembler.clz<64>(dest, dest);
    }

    void byteSwap16(RegisterID dst)
    {
        m_assembler.rev16<32>(dst, dst);
        zeroExtend16To32(dst, dst);
    }

    void byteSwap32(RegisterID dst)
    {
        m_assembler.rev<32>(dst, dst);
    }

    void byteSwap64(RegisterID dst)
    {
        m_assembler.rev<64>(dst, dst);
    }

    // Only used for testing purposes.
    void illegalInstruction()
    {
        m_assembler.illegalInstruction();
    }

    void lshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.lsl<32>(dest, src, shiftAmount);
    }

    void lshift32(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.lsl<32>(dest, src, imm.m_value & 0x1f);
    }

    void lshift32(RegisterID shiftAmount, RegisterID dest)
    {
        lshift32(dest, shiftAmount, dest);
    }

    void lshift32(TrustedImm32 imm, RegisterID dest)
    {
        lshift32(dest, imm, dest);
    }

    void lshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.lsl<64>(dest, src, shiftAmount);
    }

    void lshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.lsl<64>(dest, src, imm.m_value & 0x3f);
    }

    void lshift64(RegisterID shiftAmount, RegisterID dest)
    {
        lshift64(dest, shiftAmount, dest);
    }

    void lshift64(TrustedImm32 imm, RegisterID dest)
    {
        lshift64(dest, imm, dest);
    }

    void mul32(RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.mul<32>(dest, left, right);
    }
    
    void mul32(RegisterID src, RegisterID dest)
    {
        m_assembler.mul<32>(dest, dest, src);
    }

    void mul32(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.mul<32>(dest, src, dataTempRegister);
    }

    void mul64(RegisterID src, RegisterID dest)
    {
        m_assembler.mul<64>(dest, dest, src);
    }

    void mul64(RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.mul<64>(dest, left, right);
    }

    void multiplyAdd32(RegisterID mulLeft, RegisterID mulRight, RegisterID summand, RegisterID dest)
    {
        m_assembler.madd<32>(dest, mulLeft, mulRight, summand);
    }

    void multiplySub32(RegisterID mulLeft, RegisterID mulRight, RegisterID minuend, RegisterID dest)
    {
        m_assembler.msub<32>(dest, mulLeft, mulRight, minuend);
    }

    void multiplyNeg32(RegisterID mulLeft, RegisterID mulRight, RegisterID dest)
    {
        m_assembler.msub<32>(dest, mulLeft, mulRight, ARM64Registers::zr);
    }

    void multiplyAdd64(RegisterID mulLeft, RegisterID mulRight, RegisterID summand, RegisterID dest)
    {
        m_assembler.madd<64>(dest, mulLeft, mulRight, summand);
    }

    void multiplySub64(RegisterID mulLeft, RegisterID mulRight, RegisterID minuend, RegisterID dest)
    {
        m_assembler.msub<64>(dest, mulLeft, mulRight, minuend);
    }

    void multiplyNeg64(RegisterID mulLeft, RegisterID mulRight, RegisterID dest)
    {
        m_assembler.msub<64>(dest, mulLeft, mulRight, ARM64Registers::zr);
    }

    void multiplySignExtend32(RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.smull(dest, left, right);
    }

    void div32(RegisterID dividend, RegisterID divisor, RegisterID dest)
    {
        m_assembler.sdiv<32>(dest, dividend, divisor);
    }

    void div64(RegisterID dividend, RegisterID divisor, RegisterID dest)
    {
        m_assembler.sdiv<64>(dest, dividend, divisor);
    }

    void uDiv32(RegisterID dividend, RegisterID divisor, RegisterID dest)
    {
        m_assembler.udiv<32>(dest, dividend, divisor);
    }

    void uDiv64(RegisterID dividend, RegisterID divisor, RegisterID dest)
    {
        m_assembler.udiv<64>(dest, dividend, divisor);
    }

    void neg32(RegisterID dest)
    {
        m_assembler.neg<32>(dest, dest);
    }

    void neg32(RegisterID src, RegisterID dest)
    {
        m_assembler.neg<32>(dest, src);
    }

    void neg64(RegisterID dest)
    {
        m_assembler.neg<64>(dest, dest);
    }

    void neg64(RegisterID src, RegisterID dest)
    {
        m_assembler.neg<64>(dest, src);
    }

    void or16(TrustedImm32 imm, AbsoluteAddress address)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create32(imm.m_value);
        if (logicalImm.isValid()) {
            load16(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.orr<32>(dataTempRegister, dataTempRegister, logicalImm);
            store16(dataTempRegister, address.m_ptr);
        } else {
            load16(address.m_ptr, getCachedMemoryTempRegisterIDAndInvalidate());
            or32(imm, memoryTempRegister, getCachedDataTempRegisterIDAndInvalidate());
            store16(dataTempRegister, address.m_ptr);
        }
    }

    void or32(RegisterID src, RegisterID dest)
    {
        or32(dest, src, dest);
    }

    void or32(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.orr<32>(dest, op1, op2);
    }

    void or32(TrustedImm32 imm, RegisterID dest)
    {
        or32(imm, dest, dest);
    }

    void or32(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create32(imm.m_value);

        if (logicalImm.isValid()) {
            m_assembler.orr<32>(dest, src, logicalImm);
            return;
        }

        ASSERT(src != dataTempRegister);
        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.orr<32>(dest, src, dataTempRegister);
    }

    void or32(RegisterID src, AbsoluteAddress address)
    {
        load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.orr<32>(dataTempRegister, dataTempRegister, src);
        store32(dataTempRegister, address.m_ptr);
    }

    void or32(TrustedImm32 imm, AbsoluteAddress address)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create32(imm.m_value);
        if (logicalImm.isValid()) {
            load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.orr<32>(dataTempRegister, dataTempRegister, logicalImm);
            store32(dataTempRegister, address.m_ptr);
        } else {
            load32(address.m_ptr, getCachedMemoryTempRegisterIDAndInvalidate());
            or32(imm, memoryTempRegister, getCachedDataTempRegisterIDAndInvalidate());
            store32(dataTempRegister, address.m_ptr);
        }
    }

    void or32(TrustedImm32 imm, Address address)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());
        or32(imm, dataTempRegister, dataTempRegister);
        store32(dataTempRegister, address);
    }

    void or64(RegisterID src, RegisterID dest)
    {
        or64(dest, src, dest);
    }

    void or64(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.orr<64>(dest, op1, op2);
    }

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

    void or64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(static_cast<intptr_t>(static_cast<int64_t>(imm.m_value)));

        if (logicalImm.isValid()) {
            m_assembler.orr<64>(dest, src, logicalImm);
            return;
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.orr<64>(dest, src, dataTempRegister);
    }

    void or64(TrustedImm64 imm, RegisterID src, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(imm.m_value);

        if (logicalImm.isValid()) {
            m_assembler.orr<64>(dest, src, logicalImm);
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.orr<64>(dest, src, dataTempRegister);
    }

    void or64(TrustedImm64 imm, RegisterID dest)
    {
        LogicalImmediate logicalImm = LogicalImmediate::create64(static_cast<intptr_t>(static_cast<int64_t>(imm.m_value)));

        if (logicalImm.isValid()) {
            m_assembler.orr<64>(dest, dest, logicalImm);
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.orr<64>(dest, dest, dataTempRegister);
    }

    void rotateRight32(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.ror<32>(dest, src, imm.m_value & 31);
    }

    void rotateRight32(TrustedImm32 imm, RegisterID srcDst)
    {
        rotateRight32(srcDst, imm, srcDst);
    }

    void rotateRight32(RegisterID src, RegisterID shiftAmmount, RegisterID dest)
    {
        m_assembler.ror<32>(dest, src, shiftAmmount);
    }

    void rotateRight64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.ror<64>(dest, src, imm.m_value & 63);
    }

    void rotateRight64(TrustedImm32 imm, RegisterID srcDst)
    {
        rotateRight64(srcDst, imm, srcDst);
    }

    void rotateRight64(RegisterID src, RegisterID shiftAmmount, RegisterID dest)
    {
        m_assembler.ror<64>(dest, src, shiftAmmount);
    }

    void rshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.asr<32>(dest, src, shiftAmount);
    }

    void rshift32(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.asr<32>(dest, src, imm.m_value & 0x1f);
    }

    void rshift32(RegisterID shiftAmount, RegisterID dest)
    {
        rshift32(dest, shiftAmount, dest);
    }
    
    void rshift32(TrustedImm32 imm, RegisterID dest)
    {
        rshift32(dest, imm, dest);
    }
    
    void rshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.asr<64>(dest, src, shiftAmount);
    }
    
    void rshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.asr<64>(dest, src, imm.m_value & 0x3f);
    }
    
    void rshift64(RegisterID shiftAmount, RegisterID dest)
    {
        rshift64(dest, shiftAmount, dest);
    }
    
    void rshift64(TrustedImm32 imm, RegisterID dest)
    {
        rshift64(dest, imm, dest);
    }

    void sub32(RegisterID src, RegisterID dest)
    {
        m_assembler.sub<32>(dest, dest, src);
    }

    void sub32(RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.sub<32>(dest, left, right);
    }

    void sub32(TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.sub<32>(dest, dest, UInt12(imm.m_value));
            return;
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.add<32>(dest, dest, UInt12(-imm.m_value));
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.sub<32>(dest, dest, dataTempRegister);
    }

    void sub32(TrustedImm32 imm, Address address)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value))
            m_assembler.sub<32>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
        else if (isUInt12(-imm.m_value))
            m_assembler.add<32>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
        else {
            move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
            m_assembler.sub<32>(dataTempRegister, dataTempRegister, memoryTempRegister);
        }

        store32(dataTempRegister, address);
    }

    void sub32(TrustedImm32 imm, AbsoluteAddress address)
    {
        load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value)) {
            m_assembler.sub<32>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
            store32(dataTempRegister, address.m_ptr);
            return;
        }

        if (isUInt12(-imm.m_value)) {
            m_assembler.add<32>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
            store32(dataTempRegister, address.m_ptr);
            return;
        }

        move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.sub<32>(dataTempRegister, dataTempRegister, memoryTempRegister);
        store32(dataTempRegister, address.m_ptr);
    }

    void sub32(Address src, RegisterID dest)
    {
        load32(src, getCachedDataTempRegisterIDAndInvalidate());
        sub32(dataTempRegister, dest);
    }

    void sub64(RegisterID src, RegisterID dest)
    {
        m_assembler.sub<64>(dest, dest, src);
    }

    void sub64(RegisterID a, RegisterID b, RegisterID dest)
    {
        m_assembler.sub<64>(dest, a, b);
    }
    
    void sub64(TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.sub<64>(dest, dest, UInt12(imm.m_value));
            return;
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.add<64>(dest, dest, UInt12(-imm.m_value));
            return;
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.sub<64>(dest, dest, dataTempRegister);
    }
    
    void sub64(TrustedImm64 imm, RegisterID dest)
    {
        intptr_t immediate = imm.m_value;

        if (isUInt12(immediate)) {
            m_assembler.sub<64>(dest, dest, UInt12(static_cast<int32_t>(immediate)));
            return;
        }
        if (isUInt12(-immediate)) {
            m_assembler.add<64>(dest, dest, UInt12(static_cast<int32_t>(-immediate)));
            return;
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.sub<64>(dest, dest, dataTempRegister);
    }

    void urshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.lsr<32>(dest, src, shiftAmount);
    }
    
    void urshift32(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.lsr<32>(dest, src, imm.m_value & 0x1f);
    }

    void urshift32(RegisterID shiftAmount, RegisterID dest)
    {
        urshift32(dest, shiftAmount, dest);
    }
    
    void urshift32(TrustedImm32 imm, RegisterID dest)
    {
        urshift32(dest, imm, dest);
    }

    void urshift64(RegisterID src, RegisterID shiftAmount, RegisterID dest)
    {
        m_assembler.lsr<64>(dest, src, shiftAmount);
    }
    
    void urshift64(RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        m_assembler.lsr<64>(dest, src, imm.m_value & 0x3f);
    }

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

    void xor32(RegisterID src, RegisterID dest)
    {
        xor32(dest, src, dest);
    }

    void xor32(Address src, RegisterID dest)
    {
        load32(src, getCachedDataTempRegisterIDAndInvalidate());
        xor32(dataTempRegister, dest);
    }

    void xor32(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.eor<32>(dest, op1, op2);
    }

    void xor32(TrustedImm32 imm, RegisterID dest)
    {
        xor32(imm, dest, dest);
    }

    void xor32(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        if (imm.m_value == -1)
            m_assembler.mvn<32>(dest, src);
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create32(imm.m_value);

            if (logicalImm.isValid()) {
                m_assembler.eor<32>(dest, src, logicalImm);
                return;
            }

            move(imm, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.eor<32>(dest, src, dataTempRegister);
        }
    }

    void xor64(RegisterID src, Address address)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.eor<64>(dataTempRegister, dataTempRegister, src);
        store64(dataTempRegister, address);
    }

    void xor64(RegisterID src, RegisterID dest)
    {
        xor64(dest, src, dest);
    }

    void xor64(RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.eor<64>(dest, op1, op2);
    }

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

    void xor64(TrustedImm64 imm, RegisterID src, RegisterID dest)
    {
        if (imm.m_value == -1)
            m_assembler.mvn<64>(dest, src);
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create64(imm.m_value);

            if (logicalImm.isValid()) {
                m_assembler.eor<64>(dest, src, logicalImm);
                return;
            }

            move(imm, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.eor<64>(dest, src, dataTempRegister);
        }
    }

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

    void xor64(TrustedImm32 imm, RegisterID src, RegisterID dest)
    {
        if (imm.m_value == -1)
            m_assembler.mvn<64>(dest, src);
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create64(static_cast<intptr_t>(static_cast<int64_t>(imm.m_value)));

            if (logicalImm.isValid()) {
                m_assembler.eor<64>(dest, src, logicalImm);
                return;
            }

            signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.eor<64>(dest, src, dataTempRegister);
        }
    }
    
    void xor64(Address src, RegisterID dest)
    {
        load64(src, getCachedDataTempRegisterIDAndInvalidate());
        xor64(dataTempRegister, dest);
    }

    void not32(RegisterID srcDest)
    {
        m_assembler.mvn<32>(srcDest, srcDest);
    }

    void not32(RegisterID src, RegisterID dest)
    {
        m_assembler.mvn<32>(dest, src);
    }

    void not64(RegisterID src, RegisterID dest)
    {
        m_assembler.mvn<64>(dest, src);
    }

    void not64(RegisterID srcDst)
    {
        m_assembler.mvn<64>(srcDst, srcDst);
    }

    // Memory access operations:

    void load64(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadWithOffset<64>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<64>(dest, address.base, memoryTempRegister);
    }

    void load64(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 3)) {
            m_assembler.ldr<64>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldr<64>(dest, address.base, memoryTempRegister);
    }

    void load64(const void* address, RegisterID dest)
    {
        load<64>(address, dest);
    }

    void load64(RegisterID src, PostIndex simm, RegisterID dest)
    {
        m_assembler.ldr<64>(dest, src, simm);
    }

    DataLabel32 load64WithAddressOffsetPatch(Address address, RegisterID dest)
    {
        DataLabel32 label(this);
        signExtend32ToPtrWithFixedWidth(address.offset, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<64>(dest, address.base, memoryTempRegister, Assembler::SXTW, 0);
        return label;
    }
    
    DataLabelCompact load64WithCompactAddressOffsetPatch(Address address, RegisterID dest)
    {
        ASSERT(isCompactPtrAlignedAddressOffset(address.offset));
        DataLabelCompact label(this);
        m_assembler.ldr<64>(dest, address.base, address.offset);
        return label;
    }

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

    void loadPair64(RegisterID src, TrustedImm32 offset, RegisterID dest1, RegisterID dest2)
    {
        m_assembler.ldp<64>(dest1, dest2, src, offset.m_value);
    }

    void loadPair64WithNonTemporalAccess(RegisterID src, RegisterID dest1, RegisterID dest2)
    {
        loadPair64WithNonTemporalAccess(src, TrustedImm32(0), dest1, dest2);
    }

    void loadPair64WithNonTemporalAccess(RegisterID src, TrustedImm32 offset, RegisterID dest1, RegisterID dest2)
    {
        m_assembler.ldnp<64>(dest1, dest2, src, offset.m_value);
    }

    void abortWithReason(AbortReason reason)
    {
        // It is safe to use dataTempRegister directly since this is a crashing JIT Assert.
        move(TrustedImm32(reason), dataTempRegister);
        breakpoint();
    }

    void abortWithReason(AbortReason reason, intptr_t misc)
    {
        // It is safe to use memoryTempRegister directly since this is a crashing JIT Assert.
        move(TrustedImm64(misc), memoryTempRegister);
        abortWithReason(reason);
    }

    ConvertibleLoadLabel convertibleLoadPtr(Address address, RegisterID dest)
    {
        ConvertibleLoadLabel result(this);
        ASSERT(!(address.offset & ~0xff8));
        m_assembler.ldr<64>(dest, address.base, address.offset);
        return result;
    }

    void load32(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadWithOffset<32>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<32>(dest, address.base, memoryTempRegister);
    }

    void load32(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 2)) {
            m_assembler.ldr<32>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldr<32>(dest, address.base, memoryTempRegister);
    }

    void load32(const void* address, RegisterID dest)
    {
        load<32>(address, dest);
    }

    DataLabel32 load32WithAddressOffsetPatch(Address address, RegisterID dest)
    {
        DataLabel32 label(this);
        signExtend32ToPtrWithFixedWidth(address.offset, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<32>(dest, address.base, memoryTempRegister, Assembler::SXTW, 0);
        return label;
    }
    
    DataLabelCompact load32WithCompactAddressOffsetPatch(Address address, RegisterID dest)
    {
        ASSERT(isCompactPtrAlignedAddressOffset(address.offset));
        DataLabelCompact label(this);
        m_assembler.ldr<32>(dest, address.base, address.offset);
        return label;
    }

    void load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest)
    {
        load32(address, dest);
    }

    void load16(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadWithOffset<16>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldrh(dest, address.base, memoryTempRegister);
    }
    
    void load16(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 1)) {
            m_assembler.ldrh(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldrh(dest, address.base, memoryTempRegister);
    }

    void load16(ExtendedAddress address, RegisterID dest)
    {
        moveToCachedReg(TrustedImmPtr(reinterpret_cast<void*>(address.offset)), cachedMemoryTempRegister());
        m_assembler.ldrh(dest, memoryTempRegister, address.base, Assembler::UXTX, 1);
        if (dest == memoryTempRegister)
            cachedMemoryTempRegister().invalidate();
    }

    void load16(const void* address, RegisterID dest)
    {
        load<16>(address, dest);
    }

    void load16Unaligned(ImplicitAddress address, RegisterID dest)
    {
        load16(address, dest);
    }

    void load16Unaligned(BaseIndex address, RegisterID dest)
    {
        load16(address, dest);
    }

    void load16SignedExtendTo32(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadSignedWithOffset<16>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldrsh<32>(dest, address.base, memoryTempRegister);
    }

    void load16SignedExtendTo32(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 1)) {
            m_assembler.ldrsh<32>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldrsh<32>(dest, address.base, memoryTempRegister);
    }

    void zeroExtend16To32(RegisterID src, RegisterID dest)
    {
        m_assembler.uxth<32>(dest, src);
    }

    void signExtend16To32(RegisterID src, RegisterID dest)
    {
        m_assembler.sxth<32>(dest, src);
    }

    void load8(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadWithOffset<8>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldrb(dest, address.base, memoryTempRegister);
    }

    void load8(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && !address.scale) {
            m_assembler.ldrb(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldrb(dest, address.base, memoryTempRegister);
    }
    
    void load8(const void* address, RegisterID dest)
    {
        moveToCachedReg(TrustedImmPtr(address), cachedMemoryTempRegister());
        m_assembler.ldrb(dest, memoryTempRegister, ARM64Registers::zr);
        if (dest == memoryTempRegister)
            cachedMemoryTempRegister().invalidate();
    }

    void load8(RegisterID src, PostIndex simm, RegisterID dest)
    {
        m_assembler.ldrb(dest, src, simm);
    }

    void load8SignedExtendTo32(ImplicitAddress address, RegisterID dest)
    {
        if (tryLoadSignedWithOffset<8>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldrsb<32>(dest, address.base, memoryTempRegister);
    }

    void load8SignedExtendTo32(BaseIndex address, RegisterID dest)
    {
        if (!address.offset && !address.scale) {
            m_assembler.ldrsb<32>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldrsb<32>(dest, address.base, memoryTempRegister);
    }

    void load8SignedExtendTo32(const void* address, RegisterID dest)
    {
        moveToCachedReg(TrustedImmPtr(address), cachedMemoryTempRegister());
        m_assembler.ldrsb<32>(dest, memoryTempRegister, ARM64Registers::zr);
        if (dest == memoryTempRegister)
            cachedMemoryTempRegister().invalidate();
    }

    void zeroExtend8To32(RegisterID src, RegisterID dest)
    {
        m_assembler.uxtb<32>(dest, src);
    }

    void signExtend8To32(RegisterID src, RegisterID dest)
    {
        m_assembler.sxtb<32>(dest, src);
    }

    void store64(RegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<64>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<64>(src, address.base, memoryTempRegister);
    }

    void store64(RegisterID src, BaseIndex address)
    {
        if (!address.offset && (!address.scale || address.scale == 3)) {
            m_assembler.str<64>(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.str<64>(src, address.base, memoryTempRegister);
    }
    
    void store64(RegisterID src, const void* address)
    {
        store<64>(src, address);
    }

    void store64(TrustedImm32 imm, ImplicitAddress address)
    {
        store64(TrustedImm64(imm.m_value), address);
    }

    void store64(TrustedImm64 imm, ImplicitAddress address)
    {
        if (!imm.m_value) {
            store64(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store64(dataTempRegister, address);
    }

    void store64(TrustedImm64 imm, BaseIndex address)
    {
        if (!imm.m_value) {
            store64(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store64(dataTempRegister, address);
    }

    void store64(RegisterID src, RegisterID dest, PostIndex simm)
    {
        m_assembler.str<64>(src, dest, simm);
    }
    
    void storeZero64(ImplicitAddress address)
    {
        store64(ARM64Registers::zr, address);
    }
    
    void storeZero64(BaseIndex address)
    {
        store64(ARM64Registers::zr, address);
    }
    
    DataLabel32 store64WithAddressOffsetPatch(RegisterID src, Address address)
    {
        DataLabel32 label(this);
        signExtend32ToPtrWithFixedWidth(address.offset, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<64>(src, address.base, memoryTempRegister, Assembler::SXTW, 0);
        return label;
    }

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

    void storePair64(RegisterID src1, RegisterID src2, RegisterID dest, TrustedImm32 offset)
    {
        m_assembler.stp<64>(src1, src2, dest, offset.m_value);
    }

    void storePair64WithNonTemporalAccess(RegisterID src1, RegisterID src2, RegisterID dest)
    {
        storePair64WithNonTemporalAccess(src1, src2, dest, TrustedImm32(0));
    }

    void storePair64WithNonTemporalAccess(RegisterID src1, RegisterID src2, RegisterID dest, TrustedImm32 offset)
    {
        m_assembler.stnp<64>(src1, src2, dest, offset.m_value);
    }

    void store32(RegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<32>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<32>(src, address.base, memoryTempRegister);
    }

    void store32(RegisterID src, BaseIndex address)
    {
        if (!address.offset && (!address.scale || address.scale == 2)) {
            m_assembler.str<32>(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.str<32>(src, address.base, memoryTempRegister);
    }

    void store32(RegisterID src, const void* address)
    {
        store<32>(src, address);
    }

    void store32(TrustedImm32 imm, ImplicitAddress address)
    {
        if (!imm.m_value) {
            store32(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store32(dataTempRegister, address);
    }

    void store32(TrustedImm32 imm, BaseIndex address)
    {
        if (!imm.m_value) {
            store32(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store32(dataTempRegister, address);
    }

    void store32(TrustedImm32 imm, const void* address)
    {
        if (!imm.m_value) {
            store32(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store32(dataTempRegister, address);
    }

    void storeZero32(ImplicitAddress address)
    {
        store32(ARM64Registers::zr, address);
    }

    void storeZero32(BaseIndex address)
    {
        store32(ARM64Registers::zr, address);
    }

    DataLabel32 store32WithAddressOffsetPatch(RegisterID src, Address address)
    {
        DataLabel32 label(this);
        signExtend32ToPtrWithFixedWidth(address.offset, getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<32>(src, address.base, memoryTempRegister, Assembler::SXTW, 0);
        return label;
    }

    void store16(RegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<16>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.strh(src, address.base, memoryTempRegister);
    }

    void store16(RegisterID src, BaseIndex address)
    {
        if (!address.offset && (!address.scale || address.scale == 1)) {
            m_assembler.strh(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.strh(src, address.base, memoryTempRegister);
    }

    void store16(RegisterID src, const void* address)
    {
        store<16>(src, address);
    }

    void store16(TrustedImm32 imm, const void* address)
    {
        if (!imm.m_value) {
            store16(ARM64Registers::zr, address);
            return;
        }

        moveToCachedReg(imm, dataMemoryTempRegister());
        store16(dataTempRegister, address);
    }

    void storeZero16(ImplicitAddress address)
    {
        store16(ARM64Registers::zr, address);
    }

    void storeZero16(BaseIndex address)
    {
        store16(ARM64Registers::zr, address);
    }

    void store8(RegisterID src, BaseIndex address)
    {
        if (!address.offset && !address.scale) {
            m_assembler.strb(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.strb(src, address.base, memoryTempRegister);
    }

    void store8(RegisterID src, void* address)
    {
        move(TrustedImmPtr(address), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.strb(src, memoryTempRegister, 0);
    }

    void store8(RegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<8>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.strb(src, address.base, memoryTempRegister);
    }

    void store8(TrustedImm32 imm, void* address)
    {
        TrustedImm32 imm8(static_cast<int8_t>(imm.m_value));
        if (!imm8.m_value) {
            store8(ARM64Registers::zr, address);
            return;
        }

        move(imm8, getCachedDataTempRegisterIDAndInvalidate());
        store8(dataTempRegister, address);
    }

    void store8(TrustedImm32 imm, ImplicitAddress address)
    {
        TrustedImm32 imm8(static_cast<int8_t>(imm.m_value));
        if (!imm8.m_value) {
            store8(ARM64Registers::zr, address);
            return;
        }

        move(imm8, getCachedDataTempRegisterIDAndInvalidate());
        store8(dataTempRegister, address);
    }

    void store8(RegisterID src, RegisterID dest, PostIndex simm)
    {
        m_assembler.strb(src, dest, simm);
    }

    void getEffectiveAddress(BaseIndex address, RegisterID dest)
    {
        m_assembler.add<64>(dest, address.base, address.index, Assembler::LSL, address.scale);
        if (address.offset)
            add64(TrustedImm32(address.offset), dest);
    }

    // Floating-point operations:

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

    enum BranchTruncateType { BranchIfTruncateFailed, BranchIfTruncateSuccessful };

    void absDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fabs<64>(dest, src);
    }

    void absFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fabs<32>(dest, src);
    }

    void addDouble(FPRegisterID src, FPRegisterID dest)
    {
        addDouble(dest, src, dest);
    }

    void addDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fadd<64>(dest, op1, op2);
    }

    void addDouble(Address src, FPRegisterID dest)
    {
        loadDouble(src, fpTempRegister);
        addDouble(fpTempRegister, dest);
    }

    void addDouble(AbsoluteAddress address, FPRegisterID dest)
    {
        loadDouble(TrustedImmPtr(address.m_ptr), fpTempRegister);
        addDouble(fpTempRegister, dest);
    }

    void addFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fadd<32>(dest, op1, op2);
    }

    void ceilDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintp<64>(dest, src);
    }

    void ceilFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintp<32>(dest, src);
    }

    void floorDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintm<64>(dest, src);
    }

    void floorFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintm<32>(dest, src);
    }

    void roundTowardNearestIntDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintn<64>(dest, src);
    }

    void roundTowardNearestIntFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintn<32>(dest, src);
    }

    void roundTowardZeroDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintz<64>(dest, src);
    }

    void roundTowardZeroFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.frintz<32>(dest, src);
    }


    // Convert 'src' to an integer, and places the resulting 'dest'.
    // If the result is not representable as a 32 bit value, branch.
    // May also branch for some values that are representable in 32 bits
    // (specifically, in this case, 0).
    void branchConvertDoubleToInt32(FPRegisterID src, RegisterID dest, JumpList& failureCases, FPRegisterID, bool negZeroCheck = true)
    {
        m_assembler.fcvtns<32, 64>(dest, src);

        // Convert the integer result back to float & compare to the original value - if not equal or unordered (NaN) then jump.
        m_assembler.scvtf<64, 32>(fpTempRegister, dest);
        failureCases.append(branchDouble(DoubleNotEqualOrUnordered, src, fpTempRegister));

        // Test for negative zero.
        if (negZeroCheck) {
            Jump valueIsNonZero = branchTest32(NonZero, dest);
            RegisterID scratch = getCachedMemoryTempRegisterIDAndInvalidate();
            m_assembler.fmov<64>(scratch, src);
            failureCases.append(makeTestBitAndBranch(scratch, 63, IsNonZero));
            valueIsNonZero.link(this);
        }
    }

    Jump branchDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right)
    {
        m_assembler.fcmp<64>(left, right);
        return jumpAfterFloatingPointCompare(cond);
    }

    Jump branchFloat(DoubleCondition cond, FPRegisterID left, FPRegisterID right)
    {
        m_assembler.fcmp<32>(left, right);
        return jumpAfterFloatingPointCompare(cond);
    }

    void compareDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID dest)
    {
        floatingPointCompare(cond, left, right, dest, [this] (FPRegisterID arg1, FPRegisterID arg2) {
            m_assembler.fcmp<64>(arg1, arg2);
        });
    }

    void compareFloat(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID dest)
    {
        floatingPointCompare(cond, left, right, dest, [this] (FPRegisterID arg1, FPRegisterID arg2) {
            m_assembler.fcmp<32>(arg1, arg2);
        });
    }

    Jump branchDoubleNonZero(FPRegisterID reg, FPRegisterID)
    {
        m_assembler.fcmp_0<64>(reg);
        Jump unordered = makeBranch(Assembler::ConditionVS);
        Jump result = makeBranch(Assembler::ConditionNE);
        unordered.link(this);
        return result;
    }

    Jump branchDoubleZeroOrNaN(FPRegisterID reg, FPRegisterID)
    {
        m_assembler.fcmp_0<64>(reg);
        Jump unordered = makeBranch(Assembler::ConditionVS);
        Jump notEqual = makeBranch(Assembler::ConditionNE);
        unordered.link(this);
        // We get here if either unordered or equal.
        Jump result = jump();
        notEqual.link(this);
        return result;
    }

    Jump branchTruncateDoubleToInt32(FPRegisterID src, RegisterID dest, BranchTruncateType branchType = BranchIfTruncateFailed)
    {
        // Truncate to a 64-bit integer in dataTempRegister, copy the low 32-bit to dest.
        m_assembler.fcvtzs<64, 64>(getCachedDataTempRegisterIDAndInvalidate(), src);
        zeroExtend32ToPtr(dataTempRegister, dest);
        // Check the low 32-bits sign extend to be equal to the full value.
        m_assembler.cmp<64>(dataTempRegister, dataTempRegister, Assembler::SXTW, 0);
        return Jump(makeBranch(branchType == BranchIfTruncateSuccessful ? Equal : NotEqual));
    }

    void convertDoubleToFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fcvt<32, 64>(dest, src);
    }

    void convertFloatToDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fcvt<64, 32>(dest, src);
    }
    
    void convertInt32ToDouble(TrustedImm32 imm, FPRegisterID dest)
    {
        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        convertInt32ToDouble(dataTempRegister, dest);
    }
    
    void convertInt32ToDouble(RegisterID src, FPRegisterID dest)
    {
        m_assembler.scvtf<64, 32>(dest, src);
    }

    void convertInt32ToDouble(Address address, FPRegisterID dest)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());
        convertInt32ToDouble(dataTempRegister, dest);
    }

    void convertInt32ToDouble(AbsoluteAddress address, FPRegisterID dest)
    {
        load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        convertInt32ToDouble(dataTempRegister, dest);
    }

    void convertInt32ToFloat(RegisterID src, FPRegisterID dest)
    {
        m_assembler.scvtf<32, 32>(dest, src);
    }
    
    void convertInt64ToDouble(RegisterID src, FPRegisterID dest)
    {
        m_assembler.scvtf<64, 64>(dest, src);
    }

    void convertInt64ToFloat(RegisterID src, FPRegisterID dest)
    {
        m_assembler.scvtf<32, 64>(dest, src);
    }

    void convertUInt64ToDouble(RegisterID src, FPRegisterID dest)
    {
        m_assembler.ucvtf<64, 64>(dest, src);
    }

    void convertUInt64ToFloat(RegisterID src, FPRegisterID dest)
    {
        m_assembler.ucvtf<32, 64>(dest, src);
    }

    void divDouble(FPRegisterID src, FPRegisterID dest)
    {
        divDouble(dest, src, dest);
    }

    void divDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fdiv<64>(dest, op1, op2);
    }

    void divFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fdiv<32>(dest, op1, op2);
    }

    void loadDouble(ImplicitAddress address, FPRegisterID dest)
    {
        if (tryLoadWithOffset<64>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<64>(dest, address.base, memoryTempRegister);
    }

    void loadDouble(BaseIndex address, FPRegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 3)) {
            m_assembler.ldr<64>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldr<64>(dest, address.base, memoryTempRegister);
    }
    
    void loadDouble(TrustedImmPtr address, FPRegisterID dest)
    {
        moveToCachedReg(address, cachedMemoryTempRegister());
        m_assembler.ldr<64>(dest, memoryTempRegister, ARM64Registers::zr);
    }

    void loadFloat(ImplicitAddress address, FPRegisterID dest)
    {
        if (tryLoadWithOffset<32>(dest, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.ldr<32>(dest, address.base, memoryTempRegister);
    }

    void loadFloat(BaseIndex address, FPRegisterID dest)
    {
        if (!address.offset && (!address.scale || address.scale == 2)) {
            m_assembler.ldr<32>(dest, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.ldr<32>(dest, address.base, memoryTempRegister);
    }

    void loadFloat(TrustedImmPtr address, FPRegisterID dest)
    {
        moveToCachedReg(address, cachedMemoryTempRegister());
        m_assembler.ldr<32>(dest, memoryTempRegister, ARM64Registers::zr);
    }

    void moveDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fmov<64>(dest, src);
    }

    void moveZeroToDouble(FPRegisterID reg)
    {
        m_assembler.fmov<64>(reg, ARM64Registers::zr);
    }

    void moveDoubleTo64(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fmov<64>(dest, src);
    }

    void moveFloatTo32(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fmov<32>(dest, src);
    }

    void move64ToDouble(RegisterID src, FPRegisterID dest)
    {
        m_assembler.fmov<64>(dest, src);
    }

    void move32ToFloat(RegisterID src, FPRegisterID dest)
    {
        m_assembler.fmov<32>(dest, src);
    }

    void moveConditionallyDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID src, RegisterID dest)
    {
        m_assembler.fcmp<64>(left, right);
        moveConditionallyAfterFloatingPointCompare<64>(cond, src, dest);
    }

    void moveConditionallyDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.fcmp<64>(left, right);
        moveConditionallyAfterFloatingPointCompare<64>(cond, thenCase, elseCase, dest);
    }

    void moveConditionallyFloat(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID src, RegisterID dest)
    {
        m_assembler.fcmp<32>(left, right);
        moveConditionallyAfterFloatingPointCompare<64>(cond, src, dest);
    }

    void moveConditionallyFloat(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.fcmp<32>(left, right);
        moveConditionallyAfterFloatingPointCompare<64>(cond, thenCase, elseCase, dest);
    }

    template<int datasize>
    void moveConditionallyAfterFloatingPointCompare(DoubleCondition cond, RegisterID src, RegisterID dest)
    {
        if (cond == DoubleNotEqualAndOrdered) {
            Jump unordered = makeBranch(Assembler::ConditionVS);
            m_assembler.csel<datasize>(dest, src, dest, Assembler::ConditionNE);
            unordered.link(this);
            return;
        }
        if (cond == DoubleEqualOrUnordered) {
            // If the compare is unordered, src is copied to dest and the
            // next csel has all arguments equal to src.
            // If the compare is ordered, dest is unchanged and EQ decides
            // what value to set.
            m_assembler.csel<datasize>(dest, src, dest, Assembler::ConditionVS);
            m_assembler.csel<datasize>(dest, src, dest, Assembler::ConditionEQ);
            return;
        }
        m_assembler.csel<datasize>(dest, src, dest, ARM64Condition(cond));
    }

    template<int datasize>
    void moveConditionallyAfterFloatingPointCompare(DoubleCondition cond, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        if (cond == DoubleNotEqualAndOrdered) {
            if (dest == thenCase) {
                // If the compare is unordered, elseCase is copied to thenCase and the
                // next csel has all arguments equal to elseCase.
                // If the compare is ordered, dest is unchanged and NE decides
                // what value to set.
                m_assembler.csel<datasize>(thenCase, elseCase, thenCase, Assembler::ConditionNE);
                m_assembler.csel<datasize>(dest, thenCase, elseCase, Assembler::ConditionNE);
            } else {
                move(elseCase, dest);
                Jump unordered = makeBranch(Assembler::ConditionVS);
                m_assembler.csel<datasize>(dest, thenCase, elseCase, Assembler::ConditionNE);
                unordered.link(this);
            }
            return;
        }
        if (cond == DoubleEqualOrUnordered) {
            if (dest == elseCase) {
                // If the compare is unordered, thenCase is copied to elseCase and the
                // next csel has all arguments equal to thenCase.
                // If the compare is ordered, dest is unchanged and EQ decides
                // what value to set.
                m_assembler.csel<datasize>(elseCase, thenCase, elseCase, Assembler::ConditionVS);
                m_assembler.csel<datasize>(dest, thenCase, elseCase, Assembler::ConditionEQ);
            } else {
                move(thenCase, dest);
                Jump unordered = makeBranch(Assembler::ConditionVS);
                m_assembler.csel<datasize>(dest, thenCase, elseCase, Assembler::ConditionEQ);
                unordered.link(this);
            }
            return;
        }
        m_assembler.csel<datasize>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    template<int datasize>
    void moveDoubleConditionallyAfterFloatingPointCompare(DoubleCondition cond, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        if (cond == DoubleNotEqualAndOrdered) {
            if (dest == thenCase) {
                // If the compare is unordered, elseCase is copied to thenCase and the
                // next fcsel has all arguments equal to elseCase.
                // If the compare is ordered, dest is unchanged and NE decides
                // what value to set.
                m_assembler.fcsel<datasize>(thenCase, elseCase, thenCase, Assembler::ConditionVS);
                m_assembler.fcsel<datasize>(dest, thenCase, elseCase, Assembler::ConditionNE);
            } else {
                m_assembler.fmov<64>(dest, elseCase);
                Jump unordered = makeBranch(Assembler::ConditionVS);
                m_assembler.fcsel<datasize>(dest, thenCase, elseCase, Assembler::ConditionNE);
                unordered.link(this);
            }
            return;
        }
        if (cond == DoubleEqualOrUnordered) {
            if (dest == elseCase) {
                // If the compare is unordered, thenCase is copied to elseCase and the
                // next csel has all arguments equal to thenCase.
                // If the compare is ordered, dest is unchanged and EQ decides
                // what value to set.
                m_assembler.fcsel<datasize>(elseCase, thenCase, elseCase, Assembler::ConditionVS);
                m_assembler.fcsel<datasize>(dest, thenCase, elseCase, Assembler::ConditionEQ);
            } else {
                m_assembler.fmov<64>(dest, thenCase);
                Jump unordered = makeBranch(Assembler::ConditionVS);
                m_assembler.fcsel<datasize>(dest, thenCase, elseCase, Assembler::ConditionEQ);
                unordered.link(this);
            }
            return;
        }
        m_assembler.fcsel<datasize>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionallyDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.fcmp<64>(left, right);
        moveDoubleConditionallyAfterFloatingPointCompare<64>(cond, thenCase, elseCase, dest);
    }

    void moveDoubleConditionallyFloat(DoubleCondition cond, FPRegisterID left, FPRegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.fcmp<32>(left, right);
        moveDoubleConditionallyAfterFloatingPointCompare<64>(cond, thenCase, elseCase, dest);
    }

    void mulDouble(FPRegisterID src, FPRegisterID dest)
    {
        mulDouble(dest, src, dest);
    }

    void mulDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fmul<64>(dest, op1, op2);
    }

    void mulDouble(Address src, FPRegisterID dest)
    {
        loadDouble(src, fpTempRegister);
        mulDouble(fpTempRegister, dest);
    }

    void mulFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fmul<32>(dest, op1, op2);
    }

    void andDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.vand<64>(dest, op1, op2);
    }

    void andFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        andDouble(op1, op2, dest);
    }

    void orDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.vorr<64>(dest, op1, op2);
    }

    void orFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        orDouble(op1, op2, dest);
    }

    void negateDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fneg<64>(dest, src);
    }

    void negateFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fneg<32>(dest, src);
    }

    void sqrtDouble(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fsqrt<64>(dest, src);
    }

    void sqrtFloat(FPRegisterID src, FPRegisterID dest)
    {
        m_assembler.fsqrt<32>(dest, src);
    }

    void storeDouble(FPRegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<64>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<64>(src, address.base, memoryTempRegister);
    }

    void storeDouble(FPRegisterID src, TrustedImmPtr address)
    {
        moveToCachedReg(address, cachedMemoryTempRegister());
        m_assembler.str<64>(src, memoryTempRegister, ARM64Registers::zr);
    }

    void storeDouble(FPRegisterID src, BaseIndex address)
    {
        if (!address.offset && (!address.scale || address.scale == 3)) {
            m_assembler.str<64>(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.str<64>(src, address.base, memoryTempRegister);
    }

    void storeFloat(FPRegisterID src, ImplicitAddress address)
    {
        if (tryStoreWithOffset<32>(src, address.base, address.offset))
            return;

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.str<32>(src, address.base, memoryTempRegister);
    }
    
    void storeFloat(FPRegisterID src, BaseIndex address)
    {
        if (!address.offset && (!address.scale || address.scale == 2)) {
            m_assembler.str<32>(src, address.base, address.index, Assembler::UXTX, address.scale);
            return;
        }

        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        m_assembler.add<64>(memoryTempRegister, memoryTempRegister, address.index, Assembler::UXTX, address.scale);
        m_assembler.str<32>(src, address.base, memoryTempRegister);
    }

    void subDouble(FPRegisterID src, FPRegisterID dest)
    {
        subDouble(dest, src, dest);
    }

    void subDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fsub<64>(dest, op1, op2);
    }

    void subDouble(Address src, FPRegisterID dest)
    {
        loadDouble(src, fpTempRegister);
        subDouble(fpTempRegister, dest);
    }

    void subFloat(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest)
    {
        m_assembler.fsub<32>(dest, op1, op2);
    }

    // Result is undefined if the value is outside of the integer range.
    void truncateDoubleToInt32(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzs<32, 64>(dest, src);
    }

    void truncateDoubleToUint32(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzu<32, 64>(dest, src);
    }

    void truncateDoubleToInt64(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzs<64, 64>(dest, src);
    }

    void truncateDoubleToUint64(FPRegisterID src, RegisterID dest, FPRegisterID, FPRegisterID)
    {
        truncateDoubleToUint64(src, dest);
    }

    void truncateDoubleToUint64(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzu<64, 64>(dest, src);
    }

    void truncateFloatToInt32(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzs<32, 32>(dest, src);
    }

    void truncateFloatToUint32(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzu<32, 32>(dest, src);
    }

    void truncateFloatToInt64(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzs<64, 32>(dest, src);
    }

    void truncateFloatToUint64(FPRegisterID src, RegisterID dest, FPRegisterID, FPRegisterID)
    {
        truncateFloatToUint64(src, dest);
    }

    void truncateFloatToUint64(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fcvtzu<64, 32>(dest, src);
    }

    // Stack manipulation operations:
    //
    // The ABI is assumed to provide a stack abstraction to memory,
    // containing machine word sized units of data. Push and pop
    // operations add and remove a single register sized unit of data
    // to or from the stack. These operations are not supported on
    // ARM64. Peek and poke operations read or write values on the
    // stack, without moving the current stack position. Additionally,
    // there are popToRestore and pushToSave operations, which are
    // designed just for quick-and-dirty saving and restoring of
    // temporary values. These operations don't claim to have any
    // ABI compatibility.
    
    void pop(RegisterID) NO_RETURN_DUE_TO_CRASH
    {
        CRASH();
    }

    void push(RegisterID) NO_RETURN_DUE_TO_CRASH
    {
        CRASH();
    }

    void push(Address) NO_RETURN_DUE_TO_CRASH
    {
        CRASH();
    }

    void push(TrustedImm32) NO_RETURN_DUE_TO_CRASH
    {
        CRASH();
    }

    void popPair(RegisterID dest1, RegisterID dest2)
    {
        m_assembler.ldp<64>(dest1, dest2, ARM64Registers::sp, PairPostIndex(16));
    }

    void pushPair(RegisterID src1, RegisterID src2)
    {
        m_assembler.stp<64>(src1, src2, ARM64Registers::sp, PairPreIndex(-16));
    }

    void popToRestore(RegisterID dest)
    {
        m_assembler.ldr<64>(dest, ARM64Registers::sp, PostIndex(16));
    }

    void pushToSave(RegisterID src)
    {
        m_assembler.str<64>(src, ARM64Registers::sp, PreIndex(-16));
    }
    
    void pushToSaveImmediateWithoutTouchingRegisters(TrustedImm32 imm)
    {
        // We can use any non-hardware reserved register here since we restore its value.
        // We pick dataTempRegister arbitrarily. We don't need to invalidate it here since
        // we restore its original value.
        RegisterID reg = dataTempRegister;

        pushPair(reg, reg);
        move(imm, reg);
        store64(reg, stackPointerRegister);
        load64(Address(stackPointerRegister, 8), reg);
    }

    void pushToSave(Address address)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());
        pushToSave(dataTempRegister);
    }

    void pushToSave(TrustedImm32 imm)
    {
        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        pushToSave(dataTempRegister);
    }
    
    void popToRestore(FPRegisterID dest)
    {
        loadDouble(stackPointerRegister, dest);
        add64(TrustedImm32(16), stackPointerRegister);
    }
    
    void pushToSave(FPRegisterID src)
    {
        sub64(TrustedImm32(16), stackPointerRegister);
        storeDouble(src, stackPointerRegister);
    }

    static ptrdiff_t pushToSaveByteOffset() { return 16; }

    // Register move operations:

    void move(RegisterID src, RegisterID dest)
    {
        if (src != dest)
            m_assembler.mov<64>(dest, src);
    }

    void move(TrustedImm32 imm, RegisterID dest)
    {
        moveInternal<TrustedImm32, int32_t>(imm, dest);
    }

    void move(TrustedImmPtr imm, RegisterID dest)
    {
        moveInternal<TrustedImmPtr, intptr_t>(imm, dest);
    }

    void move(TrustedImm64 imm, RegisterID dest)
    {
        moveInternal<TrustedImm64, int64_t>(imm, dest);
    }

    void swap(RegisterID reg1, RegisterID reg2)
    {
        move(reg1, getCachedDataTempRegisterIDAndInvalidate());
        move(reg2, reg1);
        move(dataTempRegister, reg2);
    }

    void swap(FPRegisterID reg1, FPRegisterID reg2)
    {
        moveDouble(reg1, fpTempRegister);
        moveDouble(reg2, reg1);
        moveDouble(fpTempRegister, reg2);
    }

    void signExtend32ToPtr(TrustedImm32 imm, RegisterID dest)
    {
        move(TrustedImmPtr(reinterpret_cast<void*>(static_cast<intptr_t>(imm.m_value))), dest);
    }
    
    void signExtend32ToPtr(RegisterID src, RegisterID dest)
    {
        m_assembler.sxtw(dest, src);
    }

    void zeroExtend32ToPtr(RegisterID src, RegisterID dest)
    {
        m_assembler.uxtw(dest, src);
    }

    void moveConditionally32(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID src, RegisterID dest)
    {
        m_assembler.cmp<32>(left, right);
        m_assembler.csel<64>(dest, src, dest, ARM64Condition(cond));
    }

    void moveConditionally32(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.cmp<32>(left, right);
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveConditionally32(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                moveConditionallyTest32(*resultCondition, left, left, thenCase, elseCase, dest);
                return;
            }
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<32>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<32>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<32>(left, dataTempRegister);
        }
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveConditionally64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID src, RegisterID dest)
    {
        m_assembler.cmp<64>(left, right);
        m_assembler.csel<64>(dest, src, dest, ARM64Condition(cond));
    }

    void moveConditionally64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.cmp<64>(left, right);
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    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;
            }
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<64>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<64>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<64>(left, dataTempRegister);
        }
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveConditionallyTest32(ResultCondition cond, RegisterID testReg, RegisterID mask, RegisterID src, RegisterID dest)
    {
        m_assembler.tst<32>(testReg, mask);
        m_assembler.csel<64>(dest, src, dest, ARM64Condition(cond));
    }

    void moveConditionallyTest32(ResultCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.tst<32>(left, right);
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveConditionallyTest32(ResultCondition cond, RegisterID left, TrustedImm32 right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        test32(left, right);
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveConditionallyTest64(ResultCondition cond, RegisterID testReg, RegisterID mask, RegisterID src, RegisterID dest)
    {
        m_assembler.tst<64>(testReg, mask);
        m_assembler.csel<64>(dest, src, dest, ARM64Condition(cond));
    }

    void moveConditionallyTest64(ResultCondition cond, RegisterID left, RegisterID right, RegisterID thenCase, RegisterID elseCase, RegisterID dest)
    {
        m_assembler.tst<64>(left, right);
        m_assembler.csel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionally32(RelationalCondition cond, RegisterID left, RegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.cmp<32>(left, right);
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionally32(RelationalCondition cond, RegisterID left, TrustedImm32 right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                moveDoubleConditionallyTest32(*resultCondition, left, left, thenCase, elseCase, dest);
                return;
            }
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<32>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<32>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<32>(left, dataTempRegister);
        }
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionally64(RelationalCondition cond, RegisterID left, RegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.cmp<64>(left, right);
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionally64(RelationalCondition cond, RegisterID left, TrustedImm32 right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                moveDoubleConditionallyTest64(*resultCondition, left, left, thenCase, elseCase, dest);
                return;
            }
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<64>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<64>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<64>(left, dataTempRegister);
        }
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionallyTest32(ResultCondition cond, RegisterID left, RegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.tst<32>(left, right);
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionallyTest32(ResultCondition cond, RegisterID left, TrustedImm32 right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        test32(left, right);
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    void moveDoubleConditionallyTest64(ResultCondition cond, RegisterID left, RegisterID right, FPRegisterID thenCase, FPRegisterID elseCase, FPRegisterID dest)
    {
        m_assembler.tst<64>(left, right);
        m_assembler.fcsel<64>(dest, thenCase, elseCase, ARM64Condition(cond));
    }

    // Bit field operations:

    // destBitOffset is the top bit of the destination where the bits should be copied to. Zero is the lowest order bit.
    void bitFieldInsert64(RegisterID source, unsigned destBitOffset, unsigned width, RegisterID dest)
    {
        ASSERT(width <= 64 - destBitOffset && destBitOffset < 64);
        m_assembler.bfi<64>(dest, source, destBitOffset, width);
    }

    // Forwards / external control flow operations:
    //
    // This set of jump and conditional branch operations return a Jump
    // object which may linked at a later point, allow forwards jump,
    // or jumps that will require external linkage (after the code has been
    // relocated).
    //
    // For branches, signed <, >, <= and >= are denoted as l, g, le, and ge
    // respecitvely, for unsigned comparisons the names b, a, be, and ae are
    // used (representing the names 'below' and 'above').
    //
    // Operands to the comparision are provided in the expected order, e.g.
    // jle32(reg1, TrustedImm32(5)) will branch if the value held in reg1, when
    // treated as a signed 32bit value, is less than or equal to 5.
    //
    // jz and jnz test whether the first operand is equal to zero, and take
    // an optional second operand of a mask under which to perform the test.

    Jump branch32(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        m_assembler.cmp<32>(left, right);
        return Jump(makeBranch(cond));
    }

    Jump branch32(RelationalCondition cond, RegisterID left, TrustedImm32 right)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond))
                return branchTest32(*resultCondition, left, left);
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<32>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<32>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<32>(left, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branch32(RelationalCondition cond, RegisterID left, Address right)
    {
        load32(right, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, left, memoryTempRegister);
    }

    Jump branch32(RelationalCondition cond, Address left, RegisterID right)
    {
        load32(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right);
    }

    Jump branch32(RelationalCondition cond, Address left, TrustedImm32 right)
    {
        load32(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right);
    }

    Jump branch32(RelationalCondition cond, BaseIndex left, TrustedImm32 right)
    {
        load32(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right);
    }

    Jump branch32(RelationalCondition cond, AbsoluteAddress left, RegisterID right)
    {
        load32(left.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        return branch32(cond, dataTempRegister, right);
    }

    Jump branch32(RelationalCondition cond, AbsoluteAddress left, TrustedImm32 right)
    {
        load32(left.m_ptr, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right);
    }

    Jump branch64(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        if (right == ARM64Registers::sp) {
            if (cond == Equal && left != ARM64Registers::sp) {
                // CMP can only use SP for the left argument, since we are testing for equality, the order
                // does not matter here.
                std::swap(left, right);
            } else {
                move(right, getCachedDataTempRegisterIDAndInvalidate());
                right = dataTempRegister;
            }
        }
        m_assembler.cmp<64>(left, right);
        return Jump(makeBranch(cond));
    }

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

        if (isUInt12(right.m_value))
            m_assembler.cmp<64>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<64>(left, UInt12(-right.m_value));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<64>(left, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branch64(RelationalCondition cond, RegisterID left, TrustedImm64 right)
    {
        intptr_t immediate = right.m_value;
        if (!immediate) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond))
                return branchTest64(*resultCondition, left, left);
        }

        if (isUInt12(immediate))
            m_assembler.cmp<64>(left, UInt12(static_cast<int32_t>(immediate)));
        else if (isUInt12(-immediate))
            m_assembler.cmn<64>(left, UInt12(static_cast<int32_t>(-immediate)));
        else {
            moveToCachedReg(right, dataMemoryTempRegister());
            m_assembler.cmp<64>(left, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branch64(RelationalCondition cond, RegisterID left, Address right)
    {
        load64(right, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch64(cond, left, memoryTempRegister);
    }

    Jump branch64(RelationalCondition cond, AbsoluteAddress left, RegisterID right)
    {
        load64(left.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        return branch64(cond, dataTempRegister, right);
    }

    Jump branch64(RelationalCondition cond, Address left, RegisterID right)
    {
        load64(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch64(cond, memoryTempRegister, right);
    }

    Jump branch64(RelationalCondition cond, Address left, TrustedImm64 right)
    {
        load64(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch64(cond, memoryTempRegister, right);
    }

    Jump branch64(RelationalCondition cond, BaseIndex left, RegisterID right)
    {
        load64(left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch64(cond, memoryTempRegister, right);
    }

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

    Jump branch8(RelationalCondition cond, Address left, TrustedImm32 right)
    {
        TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right8);
    }

    Jump branch8(RelationalCondition cond, BaseIndex left, TrustedImm32 right)
    {
        TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, left, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right8);
    }
    
    Jump branch8(RelationalCondition cond, AbsoluteAddress left, TrustedImm32 right)
    {
        TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, left.m_ptr, getCachedMemoryTempRegisterIDAndInvalidate());
        return branch32(cond, memoryTempRegister, right8);
    }
    
    Jump branchTest32(ResultCondition cond, RegisterID reg, RegisterID mask)
    {
        if (reg == mask && (cond == Zero || cond == NonZero))
            return Jump(makeCompareAndBranch<32>(static_cast<ZeroCondition>(cond), reg));
        m_assembler.tst<32>(reg, mask);
        return Jump(makeBranch(cond));
    }

    void test32(RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
    {
        if (mask.m_value == -1)
            m_assembler.tst<32>(reg, reg);
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create32(mask.m_value);

            if (logicalImm.isValid())
                m_assembler.tst<32>(reg, logicalImm);
            else {
                move(mask, getCachedDataTempRegisterIDAndInvalidate());
                m_assembler.tst<32>(reg, dataTempRegister);
            }
        }
    }

    Jump branch(ResultCondition cond)
    {
        return Jump(makeBranch(cond));
    }

    Jump branchTest32(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
    {
        if (mask.m_value == -1) {
            if ((cond == Zero) || (cond == NonZero))
                return Jump(makeCompareAndBranch<32>(static_cast<ZeroCondition>(cond), reg));
            m_assembler.tst<32>(reg, reg);
        } else if (hasOneBitSet(mask.m_value) && ((cond == Zero) || (cond == NonZero)))
            return Jump(makeTestBitAndBranch(reg, getLSBSet(mask.m_value), static_cast<ZeroCondition>(cond)));
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create32(mask.m_value);
            if (logicalImm.isValid()) {
                m_assembler.tst<32>(reg, logicalImm);
                return Jump(makeBranch(cond));
            }

            move(mask, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.tst<32>(reg, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branchTest32(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1))
    {
        load32(address, getCachedMemoryTempRegisterIDAndInvalidate());
        return branchTest32(cond, memoryTempRegister, mask);
    }

    Jump branchTest32(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1))
    {
        load32(address, getCachedMemoryTempRegisterIDAndInvalidate());
        return branchTest32(cond, memoryTempRegister, mask);
    }

    Jump branchTest64(ResultCondition cond, RegisterID reg, RegisterID mask)
    {
        if (reg == mask && (cond == Zero || cond == NonZero))
            return Jump(makeCompareAndBranch<64>(static_cast<ZeroCondition>(cond), reg));
        m_assembler.tst<64>(reg, mask);
        return Jump(makeBranch(cond));
    }

    Jump branchTest64(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
    {
        if (mask.m_value == -1) {
            if ((cond == Zero) || (cond == NonZero))
                return Jump(makeCompareAndBranch<64>(static_cast<ZeroCondition>(cond), reg));
            m_assembler.tst<64>(reg, reg);
        } else if (hasOneBitSet(mask.m_value) && ((cond == Zero) || (cond == NonZero)))
            return Jump(makeTestBitAndBranch(reg, getLSBSet(mask.m_value), static_cast<ZeroCondition>(cond)));
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create64(mask.m_value);

            if (logicalImm.isValid()) {
                m_assembler.tst<64>(reg, logicalImm);
                return Jump(makeBranch(cond));
            }

            signExtend32ToPtr(mask, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.tst<64>(reg, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branchTest64(ResultCondition cond, RegisterID reg, TrustedImm64 mask)
    {
        if (mask.m_value == -1) {
            if ((cond == Zero) || (cond == NonZero))
                return Jump(makeCompareAndBranch<64>(static_cast<ZeroCondition>(cond), reg));
            m_assembler.tst<64>(reg, reg);
        } else if (hasOneBitSet(mask.m_value) && ((cond == Zero) || (cond == NonZero)))
            return Jump(makeTestBitAndBranch(reg, getLSBSet(mask.m_value), static_cast<ZeroCondition>(cond)));
        else {
            LogicalImmediate logicalImm = LogicalImmediate::create64(mask.m_value);

            if (logicalImm.isValid()) {
                m_assembler.tst<64>(reg, logicalImm);
                return Jump(makeBranch(cond));
            }

            move(mask, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.tst<64>(reg, dataTempRegister);
        }
        return Jump(makeBranch(cond));
    }

    Jump branchTest64(ResultCondition cond, Address address, RegisterID mask)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest64(cond, dataTempRegister, mask);
    }

    Jump branchTest64(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1))
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest64(cond, dataTempRegister, mask);
    }

    Jump branchTest64(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1))
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest64(cond, dataTempRegister, mask);
    }

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

    Jump branchTest8(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, address, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest32(cond, dataTempRegister, mask8);
    }

    Jump branchTest8(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest32(cond, dataTempRegister, mask8);
    }

    Jump branchTest8(ResultCondition cond, ExtendedAddress address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask);
        move(TrustedImmPtr(reinterpret_cast<void*>(address.offset)), getCachedDataTempRegisterIDAndInvalidate());

        if (MacroAssemblerHelpers::isUnsigned<MacroAssemblerARM64>(cond))
            m_assembler.ldrb(dataTempRegister, address.base, dataTempRegister);
        else
            m_assembler.ldrsb<32>(dataTempRegister, address.base, dataTempRegister);

        return branchTest32(cond, dataTempRegister, mask8);
    }

    Jump branchTest8(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1))
    {
        TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, address, getCachedDataTempRegisterIDAndInvalidate());
        return branchTest32(cond, dataTempRegister, mask8);
    }

    Jump branch32WithUnalignedHalfWords(RelationalCondition cond, BaseIndex left, TrustedImm32 right)
    {
        return branch32(cond, left, right);
    }


    // Arithmetic control flow operations:
    //
    // This set of conditional branch operations branch based
    // on the result of an arithmetic operation. The operation
    // is performed as normal, storing the result.
    //
    // * jz operations branch if the result is zero.
    // * jo operations branch if the (signed) arithmetic
    //   operation caused an overflow to occur.
    
    Jump branchAdd32(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.add<32, S>(dest, op1, op2);
        return Jump(makeBranch(cond));
    }

    Jump branchAdd32(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.add<32, S>(dest, op1, UInt12(imm.m_value));
            return Jump(makeBranch(cond));
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<32, S>(dest, op1, UInt12(-imm.m_value));
            return Jump(makeBranch(cond));
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        return branchAdd32(cond, op1, dataTempRegister, dest);
    }

    Jump branchAdd32(ResultCondition cond, Address src, RegisterID dest)
    {
        load32(src, getCachedDataTempRegisterIDAndInvalidate());
        return branchAdd32(cond, dest, dataTempRegister, dest);
    }

    Jump branchAdd32(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchAdd32(cond, dest, src, dest);
    }

    Jump branchAdd32(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        return branchAdd32(cond, dest, imm, dest);
    }

    Jump branchAdd32(ResultCondition cond, TrustedImm32 imm, AbsoluteAddress address)
    {
        load32(address.m_ptr, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value)) {
            m_assembler.add<32, S>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
            store32(dataTempRegister, address.m_ptr);
        } else if (isUInt12(-imm.m_value)) {
            m_assembler.sub<32, S>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
            store32(dataTempRegister, address.m_ptr);
        } else {
            move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
            m_assembler.add<32, S>(dataTempRegister, dataTempRegister, memoryTempRegister);
            store32(dataTempRegister, address.m_ptr);
        }

        return Jump(makeBranch(cond));
    }

    Jump branchAdd32(ResultCondition cond, TrustedImm32 imm, Address address)
    {
        load32(address, getCachedDataTempRegisterIDAndInvalidate());

        if (isUInt12(imm.m_value))
            m_assembler.add<32, S>(dataTempRegister, dataTempRegister, UInt12(imm.m_value));
        else if (isUInt12(-imm.m_value))
            m_assembler.sub<32, S>(dataTempRegister, dataTempRegister, UInt12(-imm.m_value));
        else {
            move(imm, getCachedMemoryTempRegisterIDAndInvalidate());
            m_assembler.add<32, S>(dataTempRegister, dataTempRegister, memoryTempRegister);
        }

        store32(dataTempRegister, address);
        return Jump(makeBranch(cond));
    }

    Jump branchAdd64(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.add<64, S>(dest, op1, op2);
        return Jump(makeBranch(cond));
    }

    Jump branchAdd64(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.add<64, S>(dest, op1, UInt12(imm.m_value));
            return Jump(makeBranch(cond));
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.sub<64, S>(dest, op1, UInt12(-imm.m_value));
            return Jump(makeBranch(cond));
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        return branchAdd64(cond, op1, dataTempRegister, dest);
    }

    Jump branchAdd64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchAdd64(cond, dest, src, dest);
    }

    Jump branchAdd64(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        return branchAdd64(cond, dest, imm, dest);
    }

    Jump branchAdd64(RelationalCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        ASSERT(isUInt12(imm.m_value));
        m_assembler.add<64, S>(dest, dest, UInt12(imm.m_value));
        return Jump(makeBranch(cond));
    }

    Jump branchMul32(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID scratch1, RegisterID scratch2, RegisterID dest)
    {
        ASSERT(cond != Signed);

        if (cond != Overflow) {
            m_assembler.mul<32>(dest, src1, src2);
            return branchTest32(cond, dest);
        }

        // This is a signed multiple of two 32-bit values, producing a 64-bit result.
        m_assembler.smull(dest, src1, src2);
        // Copy bits 63..32 of the result to bits 31..0 of scratch1.
        m_assembler.asr<64>(scratch1, dest, 32);
        // Splat bit 31 of the result to bits 31..0 of scratch2.
        m_assembler.asr<32>(scratch2, dest, 31);
        // After a mul32 the top 32 bits of the register should be clear.
        zeroExtend32ToPtr(dest, dest);
        // Check that bits 31..63 of the original result were all equal.
        return branch32(NotEqual, scratch2, scratch1);
    }

    Jump branchMul32(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID dest)
    {
        return branchMul32(cond, src1, src2, getCachedDataTempRegisterIDAndInvalidate(), getCachedMemoryTempRegisterIDAndInvalidate(), dest);
    }

    Jump branchMul32(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchMul32(cond, dest, src, dest);
    }

    Jump branchMul32(ResultCondition cond, RegisterID src, TrustedImm32 imm, RegisterID dest)
    {
        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        return branchMul32(cond, dataTempRegister, src, dest);
    }

    Jump branchMul64(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID scratch1, RegisterID scratch2, RegisterID dest)
    {
        ASSERT(cond != Signed);

        // This is a signed multiple of two 64-bit values, producing a 64-bit result.
        m_assembler.mul<64>(dest, src1, src2);

        if (cond != Overflow)
            return branchTest64(cond, dest);

        // Compute bits 127..64 of the result into scratch1.
        m_assembler.smulh(scratch1, src1, src2);
        // Splat bit 63 of the result to bits 63..0 of scratch2.
        m_assembler.asr<64>(scratch2, dest, 63);
        // Check that bits 31..63 of the original result were all equal.
        return branch64(NotEqual, scratch2, scratch1);
    }

    Jump branchMul64(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID dest)
    {
        return branchMul64(cond, src1, src2, getCachedDataTempRegisterIDAndInvalidate(), getCachedMemoryTempRegisterIDAndInvalidate(), dest);
    }

    Jump branchMul64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchMul64(cond, dest, src, dest);
    }

    Jump branchNeg32(ResultCondition cond, RegisterID dest)
    {
        m_assembler.neg<32, S>(dest, dest);
        return Jump(makeBranch(cond));
    }

    Jump branchNeg64(ResultCondition cond, RegisterID srcDest)
    {
        m_assembler.neg<64, S>(srcDest, srcDest);
        return Jump(makeBranch(cond));
    }

    Jump branchSub32(ResultCondition cond, RegisterID dest)
    {
        m_assembler.neg<32, S>(dest, dest);
        return Jump(makeBranch(cond));
    }

    Jump branchSub32(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.sub<32, S>(dest, op1, op2);
        return Jump(makeBranch(cond));
    }

    Jump branchSub32(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.sub<32, S>(dest, op1, UInt12(imm.m_value));
            return Jump(makeBranch(cond));
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.add<32, S>(dest, op1, UInt12(-imm.m_value));
            return Jump(makeBranch(cond));
        }

        signExtend32ToPtr(imm, getCachedDataTempRegisterIDAndInvalidate());
        return branchSub32(cond, op1, dataTempRegister, dest);
    }

    Jump branchSub32(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchSub32(cond, dest, src, dest);
    }

    Jump branchSub32(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        return branchSub32(cond, dest, imm, dest);
    }

    Jump branchSub64(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.sub<64, S>(dest, op1, op2);
        return Jump(makeBranch(cond));
    }

    Jump branchSub64(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest)
    {
        if (isUInt12(imm.m_value)) {
            m_assembler.sub<64, S>(dest, op1, UInt12(imm.m_value));
            return Jump(makeBranch(cond));
        }
        if (isUInt12(-imm.m_value)) {
            m_assembler.add<64, S>(dest, op1, UInt12(-imm.m_value));
            return Jump(makeBranch(cond));
        }

        move(imm, getCachedDataTempRegisterIDAndInvalidate());
        return branchSub64(cond, op1, dataTempRegister, dest);
    }

    Jump branchSub64(ResultCondition cond, RegisterID src, RegisterID dest)
    {
        return branchSub64(cond, dest, src, dest);
    }

    Jump branchSub64(ResultCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        return branchSub64(cond, dest, imm, dest);
    }

    Jump branchSub64(RelationalCondition cond, TrustedImm32 imm, RegisterID dest)
    {
        ASSERT(isUInt12(imm.m_value));
        m_assembler.sub<64, S>(dest, dest, UInt12(imm.m_value));
        return Jump(makeBranch(cond));
    }


    // Jumps, calls, returns

    ALWAYS_INLINE Call call(PtrTag)
    {
        AssemblerLabel pointerLabel = m_assembler.label();
        moveWithFixedWidth(TrustedImmPtr(nullptr), getCachedDataTempRegisterIDAndInvalidate());
        invalidateAllTempRegisters();
        m_assembler.blr(dataTempRegister);
        AssemblerLabel callLabel = m_assembler.label();
        ASSERT_UNUSED(pointerLabel, Assembler::getDifferenceBetweenLabels(callLabel, pointerLabel) == REPATCH_OFFSET_CALL_TO_POINTER);
        return Call(callLabel, Call::Linkable);
    }

    ALWAYS_INLINE Call call(RegisterID target, PtrTag)
    {
        invalidateAllTempRegisters();
        m_assembler.blr(target);
        return Call(m_assembler.label(), Call::None);
    }

    ALWAYS_INLINE Call call(Address address, PtrTag tag)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        return call(dataTempRegister, tag);
    }

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

    ALWAYS_INLINE void callOperation(const FunctionPtr<OperationPtrTag> operation)
    {
        auto tmp = getCachedDataTempRegisterIDAndInvalidate();
        move(TrustedImmPtr(operation.executableAddress()), tmp);
        call(tmp, OperationPtrTag);
    }

    ALWAYS_INLINE Jump jump()
    {
        AssemblerLabel label = m_assembler.label();
        m_assembler.b();
        return Jump(label, m_makeJumpPatchable ? Assembler::JumpNoConditionFixedSize : Assembler::JumpNoCondition);
    }

    void farJump(RegisterID target, PtrTag)
    {
        m_assembler.br(target);
    }

    void farJump(Address address, PtrTag)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.br(dataTempRegister);
    }
    
    void farJump(BaseIndex address, PtrTag)
    {
        load64(address, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.br(dataTempRegister);
    }

    void farJump(AbsoluteAddress address, PtrTag)
    {
        move(TrustedImmPtr(address.m_ptr), getCachedDataTempRegisterIDAndInvalidate());
        load64(Address(dataTempRegister), dataTempRegister);
        m_assembler.br(dataTempRegister);
    }

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

    ALWAYS_INLINE Call nearCall()
    {
        invalidateAllTempRegisters();
        m_assembler.bl();
        return Call(m_assembler.label(), Call::LinkableNear);
    }

    ALWAYS_INLINE Call nearTailCall()
    {
        AssemblerLabel label = m_assembler.label();
        m_assembler.b();
        return Call(label, Call::LinkableNearTail);
    }

    ALWAYS_INLINE Call threadSafePatchableNearCall()
    {
        invalidateAllTempRegisters();
        m_assembler.bl();
        return Call(m_assembler.label(), Call::LinkableNear);
    }

    ALWAYS_INLINE void ret()
    {
        m_assembler.ret();
    }

    // Comparisons operations

    void compare32(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.cmp<32>(left, right);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void compare32(RelationalCondition cond, Address left, RegisterID right, RegisterID dest)
    {
        load32(left, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.cmp<32>(dataTempRegister, right);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void compare32(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID dest)
    {
        if (!right.m_value) {
            if (auto resultCondition = commuteCompareToZeroIntoTest(cond)) {
                test32(*resultCondition, left, left, dest);
                return;
            }
        }

        if (isUInt12(right.m_value))
            m_assembler.cmp<32>(left, UInt12(right.m_value));
        else if (isUInt12(-right.m_value))
            m_assembler.cmn<32>(left, UInt12(-right.m_value));
        else {
            move(right, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.cmp<32>(left, dataTempRegister);
        }
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void compare64(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID dest)
    {
        m_assembler.cmp<64>(left, right);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }
    
    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;
            }
        }

        signExtend32ToPtr(right, getCachedDataTempRegisterIDAndInvalidate());
        m_assembler.cmp<64>(left, dataTempRegister);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void compare8(RelationalCondition cond, Address left, TrustedImm32 right, RegisterID dest)
    {
        TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, left, getCachedMemoryTempRegisterIDAndInvalidate());
        move(right8, getCachedDataTempRegisterIDAndInvalidate());
        compare32(cond, memoryTempRegister, dataTempRegister, dest);
    }

    void test32(ResultCondition cond, RegisterID src, RegisterID mask, RegisterID dest)
    {
        m_assembler.tst<32>(src, mask);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void test32(ResultCondition cond, RegisterID src, TrustedImm32 mask, RegisterID dest)
    {
        test32(src, mask);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void test32(ResultCondition cond, Address address, TrustedImm32 mask, RegisterID dest)
    {
        load32(address, getCachedMemoryTempRegisterIDAndInvalidate());
        test32(cond, memoryTempRegister, mask, dest);
    }

    void test8(ResultCondition cond, Address address, TrustedImm32 mask, RegisterID dest)
    {
        TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask);
        MacroAssemblerHelpers::load8OnCondition(*this, cond, address, getCachedMemoryTempRegisterIDAndInvalidate());
        test32(cond, memoryTempRegister, mask8, dest);
    }

    void test64(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest)
    {
        m_assembler.tst<64>(op1, op2);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void test64(ResultCondition cond, RegisterID src, TrustedImm32 mask, RegisterID dest)
    {
        if (mask.m_value == -1)
            m_assembler.tst<64>(src, src);
        else {
            signExtend32ToPtr(mask, getCachedDataTempRegisterIDAndInvalidate());
            m_assembler.tst<64>(src, dataTempRegister);
        }
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    void setCarry(RegisterID dest)
    {
        m_assembler.cset<32>(dest, Assembler::ConditionCS);
    }

    // Patchable operations

    ALWAYS_INLINE DataLabel32 moveWithPatch(TrustedImm32 imm, RegisterID dest)
    {
        DataLabel32 label(this);
        moveWithFixedWidth(imm, dest);
        return label;
    }

    ALWAYS_INLINE DataLabelPtr moveWithPatch(TrustedImmPtr imm, RegisterID dest)
    {
        DataLabelPtr label(this);
        moveWithFixedWidth(imm, dest);
        return label;
    }

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

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

    ALWAYS_INLINE Jump branch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0))
    {
        dataLabel = DataLabel32(this);
        moveWithPatch(initialRightValue, getCachedDataTempRegisterIDAndInvalidate());
        return branch32(cond, left, dataTempRegister);
    }

    PatchableJump patchableBranchPtr(RelationalCondition cond, Address left, TrustedImmPtr right)
    {
        m_makeJumpPatchable = true;
        Jump result = branch64(cond, left, TrustedImm64(right));
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch8(RelationalCondition cond, Address left, TrustedImm32 imm)
    {
        m_makeJumpPatchable = true;
        Jump result = branch8(cond, left, imm);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranchTest32(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
    {
        m_makeJumpPatchable = true;
        Jump result = branchTest32(cond, reg, mask);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch32(RelationalCondition cond, RegisterID reg, TrustedImm32 imm)
    {
        m_makeJumpPatchable = true;
        Jump result = branch32(cond, reg, imm);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch32(RelationalCondition cond, Address left, TrustedImm32 imm)
    {
        m_makeJumpPatchable = true;
        Jump result = branch32(cond, left, imm);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch64(RelationalCondition cond, RegisterID reg, TrustedImm64 imm)
    {
        m_makeJumpPatchable = true;
        Jump result = branch64(cond, reg, imm);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch64(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        m_makeJumpPatchable = true;
        Jump result = branch64(cond, left, right);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranchPtrWithPatch(RelationalCondition cond, Address left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(nullptr))
    {
        m_makeJumpPatchable = true;
        Jump result = branchPtrWithPatch(cond, left, dataLabel, initialRightValue);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableBranch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0))
    {
        m_makeJumpPatchable = true;
        Jump result = branch32WithPatch(cond, left, dataLabel, initialRightValue);
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    PatchableJump patchableJump()
    {
        m_makeJumpPatchable = true;
        Jump result = jump();
        m_makeJumpPatchable = false;
        return PatchableJump(result);
    }

    ALWAYS_INLINE DataLabelPtr storePtrWithPatch(TrustedImmPtr initialValue, ImplicitAddress address)
    {
        DataLabelPtr label(this);
        moveWithFixedWidth(initialValue, getCachedDataTempRegisterIDAndInvalidate());
        store64(dataTempRegister, address);
        return label;
    }

    ALWAYS_INLINE DataLabelPtr storePtrWithPatch(ImplicitAddress address)
    {
        return storePtrWithPatch(TrustedImmPtr(nullptr), address);
    }

    static void reemitInitialMoveWithPatch(void* address, void* value)
    {
        Assembler::setPointer(static_cast<int*>(address), value, dataTempRegister, true);
    }

    // Miscellaneous operations:

    void breakpoint(uint16_t imm = 0)
    {
        m_assembler.brk(imm);
    }

    static bool isBreakpoint(void* address) { return Assembler::isBrk(address); }

    void nop()
    {
        m_assembler.nop();
    }
    
    // We take memoryFence to mean acqrel. This has acqrel semantics on ARM64.
    void memoryFence()
    {
        m_assembler.dmbISH();
    }

    // We take this to mean that it prevents motion of normal stores. That's a store fence on ARM64 (hence the "ST").
    void storeFence()
    {
        m_assembler.dmbISHST();
    }

    // We take this to mean that it prevents motion of normal loads. Ideally we'd have expressed this
    // using dependencies or half fences, but there are cases where this is as good as it gets. The only
    // way to get a standalone load fence instruction on ARM is to use the ISH fence, which is just like
    // the memoryFence().
    void loadFence()
    {
        m_assembler.dmbISH();
    }
    
    void loadAcq8SignedExtendTo32(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldar<8>(dest, extractSimpleAddress(address));
    }
    
    void loadAcq8(ImplicitAddress address, RegisterID dest)
    {
        loadAcq8SignedExtendTo32(address, dest);
        and32(TrustedImm32(0xff), dest);
    }
    
    void storeRel8(RegisterID src, ImplicitAddress address)
    {
        m_assembler.stlr<8>(src, extractSimpleAddress(address));
    }
    
    void loadAcq16SignedExtendTo32(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldar<16>(dest, extractSimpleAddress(address));
    }
    
    void loadAcq16(ImplicitAddress address, RegisterID dest)
    {
        loadAcq16SignedExtendTo32(address, dest);
        and32(TrustedImm32(0xffff), dest);
    }
    
    void storeRel16(RegisterID src, ImplicitAddress address)
    {
        m_assembler.stlr<16>(src, extractSimpleAddress(address));
    }
    
    void loadAcq32(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldar<32>(dest, extractSimpleAddress(address));
    }
    
    void loadAcq64(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldar<64>(dest, extractSimpleAddress(address));
    }
    
    void storeRel32(RegisterID dest, ImplicitAddress address)
    {
        m_assembler.stlr<32>(dest, extractSimpleAddress(address));
    }
    
    void storeRel64(RegisterID dest, ImplicitAddress address)
    {
        m_assembler.stlr<64>(dest, extractSimpleAddress(address));
    }
    
    void loadLink8(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldxr<8>(dest, extractSimpleAddress(address));
    }
    
    void loadLinkAcq8(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldaxr<8>(dest, extractSimpleAddress(address));
    }
    
    void storeCond8(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stxr<8>(result, src, extractSimpleAddress(address));
    }
    
    void storeCondRel8(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stlxr<8>(result, src, extractSimpleAddress(address));
    }
    
    void loadLink16(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldxr<16>(dest, extractSimpleAddress(address));
    }
    
    void loadLinkAcq16(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldaxr<16>(dest, extractSimpleAddress(address));
    }
    
    void storeCond16(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stxr<16>(result, src, extractSimpleAddress(address));
    }
    
    void storeCondRel16(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stlxr<16>(result, src, extractSimpleAddress(address));
    }
    
    void loadLink32(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldxr<32>(dest, extractSimpleAddress(address));
    }
    
    void loadLinkAcq32(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldaxr<32>(dest, extractSimpleAddress(address));
    }
    
    void storeCond32(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stxr<32>(result, src, extractSimpleAddress(address));
    }
    
    void storeCondRel32(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stlxr<32>(result, src, extractSimpleAddress(address));
    }
    
    void loadLink64(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldxr<64>(dest, extractSimpleAddress(address));
    }
    
    void loadLinkAcq64(ImplicitAddress address, RegisterID dest)
    {
        m_assembler.ldaxr<64>(dest, extractSimpleAddress(address));
    }
    
    void storeCond64(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stxr<64>(result, src, extractSimpleAddress(address));
    }
    
    void storeCondRel64(RegisterID src, ImplicitAddress address, RegisterID result)
    {
        m_assembler.stlxr<64>(result, src, extractSimpleAddress(address));
    }
    
    template<typename AddressType>
    void atomicStrongCAS8(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicStrongCAS<8>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicStrongCAS16(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicStrongCAS<16>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicStrongCAS32(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicStrongCAS<32>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicStrongCAS<64>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicRelaxedStrongCAS8(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicRelaxedStrongCAS<8>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicRelaxedStrongCAS16(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicRelaxedStrongCAS<16>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicRelaxedStrongCAS32(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicRelaxedStrongCAS<32>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    void atomicRelaxedStrongCAS64(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        atomicRelaxedStrongCAS<64>(cond, expectedAndResult, newValue, address, result);
    }
    
    template<typename AddressType>
    JumpList branchAtomicWeakCAS8(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicWeakCAS<8>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicWeakCAS16(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicWeakCAS<16>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicWeakCAS32(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicWeakCAS<32>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicWeakCAS<64>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicRelaxedWeakCAS8(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicRelaxedWeakCAS<8>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicRelaxedWeakCAS16(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicRelaxedWeakCAS<16>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicRelaxedWeakCAS32(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicRelaxedWeakCAS<32>(cond, expectedAndClobbered, newValue, address);
    }
    
    template<typename AddressType>
    JumpList branchAtomicRelaxedWeakCAS64(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        return branchAtomicRelaxedWeakCAS<64>(cond, expectedAndClobbered, newValue, address);
    }
    
    void depend32(RegisterID src, RegisterID dest)
    {
        m_assembler.eor<32>(dest, src, src);
    }
    
    void depend64(RegisterID src, RegisterID dest)
    {
        m_assembler.eor<64>(dest, src, src);
    }

    ALWAYS_INLINE static bool supportsDoubleToInt32ConversionUsingJavaScriptSemantics()
    {
#if HAVE(FJCVTZS_INSTRUCTION)
        return true;
#else
        if (s_jscvtCheckState == CPUIDCheckState::NotChecked)
            collectCPUFeatures();

        return s_jscvtCheckState == CPUIDCheckState::Set;
#endif
    }

    void convertDoubleToInt32UsingJavaScriptSemantics(FPRegisterID src, RegisterID dest)
    {
        m_assembler.fjcvtzs(dest, src); // This zero extends.
    }
    
#if ENABLE(FAST_TLS_JIT)
    // This will use scratch registers if the offset is not legal.

    void loadFromTLS32(uint32_t offset, RegisterID dst)
    {
        m_assembler.mrs_TPIDRRO_EL0(dst);
        and64(TrustedImm32(~7), dst);
        load32(Address(dst, offset), dst);
    }
    
    void loadFromTLS64(uint32_t offset, RegisterID dst)
    {
        m_assembler.mrs_TPIDRRO_EL0(dst);
        and64(TrustedImm32(~7), dst);
        load64(Address(dst, offset), dst);
    }

    static bool loadFromTLSPtrNeedsMacroScratchRegister()
    {
        return true;
    }

    void storeToTLS32(RegisterID src, uint32_t offset)
    {
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        ASSERT(src != tmp);
        m_assembler.mrs_TPIDRRO_EL0(tmp);
        and64(TrustedImm32(~7), tmp);
        store32(src, Address(tmp, offset));
    }
    
    void storeToTLS64(RegisterID src, uint32_t offset)
    {
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        ASSERT(src != tmp);
        m_assembler.mrs_TPIDRRO_EL0(tmp);
        and64(TrustedImm32(~7), tmp);
        store64(src, Address(tmp, offset));
    }

    static bool storeToTLSPtrNeedsMacroScratchRegister()
    {
        return true;
    }
#endif // ENABLE(FAST_TLS_JIT)
    
    // Misc helper functions.

    // Invert a relational condition, e.g. == becomes !=, < becomes >=, etc.
    static RelationalCondition invert(RelationalCondition cond)
    {
        return static_cast<RelationalCondition>(Assembler::invert(static_cast<Assembler::Condition>(cond)));
    }

    static Optional<ResultCondition> commuteCompareToZeroIntoTest(RelationalCondition cond)
    {
        switch (cond) {
        case Equal:
            return Zero;
        case NotEqual:
            return NonZero;
        case LessThan:
            return Signed;
        case GreaterThanOrEqual:
            return PositiveOrZero;
            break;
        default:
            return WTF::nullopt;
        }
    }

    template<PtrTag resultTag, PtrTag locationTag>
    static FunctionPtr<resultTag> readCallTarget(CodeLocationCall<locationTag> call)
    {
        return FunctionPtr<resultTag>(MacroAssemblerCodePtr<resultTag>(Assembler::readCallTarget(call.dataLocation())));
    }

    template<PtrTag tag>
    static void replaceWithVMHalt(CodeLocationLabel<tag> instructionStart)
    {
        Assembler::replaceWithVMHalt(instructionStart.dataLocation());
    }

    template<PtrTag startTag, PtrTag destTag>
    static void replaceWithJump(CodeLocationLabel<startTag> instructionStart, CodeLocationLabel<destTag> destination)
    {
        Assembler::replaceWithJump(instructionStart.dataLocation(), destination.dataLocation());
    }
    
    static ptrdiff_t maxJumpReplacementSize()
    {
        return Assembler::maxJumpReplacementSize();
    }

    static ptrdiff_t patchableJumpSize()
    {
        return Assembler::patchableJumpSize();
    }

    RegisterID scratchRegisterForBlinding()
    {
        // We *do not* have a scratch register for blinding.
        RELEASE_ASSERT_NOT_REACHED();
        return getCachedDataTempRegisterIDAndInvalidate();
    }

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

    template<PtrTag tag>
    static CodeLocationLabel<tag> startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr<tag> label)
    {
        return label.labelAtOffset(0);
    }

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

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

    template<PtrTag tag>
    static void revertJumpReplacementToBranchPtrWithPatch(CodeLocationLabel<tag> instructionStart, RegisterID, void* initialValue)
    {
        reemitInitialMoveWithPatch(instructionStart.dataLocation(), initialValue);
    }

    template<PtrTag tag>
    static void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel<tag>, Address, void*)
    {
        UNREACHABLE_FOR_PLATFORM();
    }

    template<PtrTag tag>
    static void revertJumpReplacementToPatchableBranch32WithPatch(CodeLocationLabel<tag>, Address, int32_t)
    {
        UNREACHABLE_FOR_PLATFORM();
    }

    template<PtrTag callTag, PtrTag destTag>
    static void repatchCall(CodeLocationCall<callTag> call, CodeLocationLabel<destTag> destination)
    {
        Assembler::repatchPointer(call.dataLabelPtrAtOffset(REPATCH_OFFSET_CALL_TO_POINTER).dataLocation(), destination.executableAddress());
    }

    template<PtrTag callTag, PtrTag destTag>
    static void repatchCall(CodeLocationCall<callTag> call, FunctionPtr<destTag> destination)
    {
        Assembler::repatchPointer(call.dataLabelPtrAtOffset(REPATCH_OFFSET_CALL_TO_POINTER).dataLocation(), destination.executableAddress());
    }

protected:
    ALWAYS_INLINE Jump makeBranch(Assembler::Condition cond)
    {
        m_assembler.b_cond(cond);
        AssemblerLabel label = m_assembler.label();
        m_assembler.nop();
        return Jump(label, m_makeJumpPatchable ? Assembler::JumpConditionFixedSize : Assembler::JumpCondition, cond);
    }
    ALWAYS_INLINE Jump makeBranch(RelationalCondition cond) { return makeBranch(ARM64Condition(cond)); }
    ALWAYS_INLINE Jump makeBranch(ResultCondition cond) { return makeBranch(ARM64Condition(cond)); }
    ALWAYS_INLINE Jump makeBranch(DoubleCondition cond) { return makeBranch(ARM64Condition(cond)); }

    template <int dataSize>
    ALWAYS_INLINE Jump makeCompareAndBranch(ZeroCondition cond, RegisterID reg)
    {
        if (cond == IsZero)
            m_assembler.cbz<dataSize>(reg);
        else
            m_assembler.cbnz<dataSize>(reg);
        AssemblerLabel label = m_assembler.label();
        m_assembler.nop();
        return Jump(label, m_makeJumpPatchable ? Assembler::JumpCompareAndBranchFixedSize : Assembler::JumpCompareAndBranch, static_cast<Assembler::Condition>(cond), dataSize == 64, reg);
    }

    ALWAYS_INLINE Jump makeTestBitAndBranch(RegisterID reg, unsigned bit, ZeroCondition cond)
    {
        ASSERT(bit < 64);
        bit &= 0x3f;
        if (cond == IsZero)
            m_assembler.tbz(reg, bit);
        else
            m_assembler.tbnz(reg, bit);
        AssemblerLabel label = m_assembler.label();
        m_assembler.nop();
        return Jump(label, m_makeJumpPatchable ? Assembler::JumpTestBitFixedSize : Assembler::JumpTestBit, static_cast<Assembler::Condition>(cond), bit, reg);
    }

    Assembler::Condition ARM64Condition(RelationalCondition cond)
    {
        return static_cast<Assembler::Condition>(cond);
    }

    Assembler::Condition ARM64Condition(ResultCondition cond)
    {
        return static_cast<Assembler::Condition>(cond);
    }

    Assembler::Condition ARM64Condition(DoubleCondition cond)
    {
        return static_cast<Assembler::Condition>(cond);
    }
    
protected:
    ALWAYS_INLINE RegisterID getCachedDataTempRegisterIDAndInvalidate()
    {
        RELEASE_ASSERT(m_allowScratchRegister);
        return dataMemoryTempRegister().registerIDInvalidate();
    }
    ALWAYS_INLINE RegisterID getCachedMemoryTempRegisterIDAndInvalidate()
    {
        RELEASE_ASSERT(m_allowScratchRegister);
        return cachedMemoryTempRegister().registerIDInvalidate();
    }
    ALWAYS_INLINE CachedTempRegister& dataMemoryTempRegister()
    {
        RELEASE_ASSERT(m_allowScratchRegister);
        return m_dataMemoryTempRegister;
    }
    ALWAYS_INLINE CachedTempRegister& cachedMemoryTempRegister()
    {
        RELEASE_ASSERT(m_allowScratchRegister);
        return m_cachedMemoryTempRegister;
    }

    template<typename ImmediateType, typename rawType>
    void moveInternal(ImmediateType imm, RegisterID dest)
    {
        const int dataSize = sizeof(rawType) * 8;
        const int numberHalfWords = dataSize / 16;
        rawType value = bitwise_cast<rawType>(imm.m_value);
        uint16_t halfword[numberHalfWords];

        // Handle 0 and ~0 here to simplify code below
        if (!value) {
            m_assembler.movz<dataSize>(dest, 0);
            return;
        }
        if (!~value) {
            m_assembler.movn<dataSize>(dest, 0);
            return;
        }

        LogicalImmediate logicalImm = dataSize == 64 ? LogicalImmediate::create64(static_cast<uint64_t>(value)) : LogicalImmediate::create32(static_cast<uint32_t>(value));

        if (logicalImm.isValid()) {
            m_assembler.movi<dataSize>(dest, logicalImm);
            return;
        }

        // Figure out how many halfwords are 0 or FFFF, then choose movz or movn accordingly.
        int zeroOrNegateVote = 0;
        for (int i = 0; i < numberHalfWords; ++i) {
            halfword[i] = getHalfword(value, i);
            if (!halfword[i])
                zeroOrNegateVote++;
            else if (halfword[i] == 0xffff)
                zeroOrNegateVote--;
        }

        bool needToClearRegister = true;
        if (zeroOrNegateVote >= 0) {
            for (int i = 0; i < numberHalfWords; i++) {
                if (halfword[i]) {
                    if (needToClearRegister) {
                        m_assembler.movz<dataSize>(dest, halfword[i], 16*i);
                        needToClearRegister = false;
                    } else
                        m_assembler.movk<dataSize>(dest, halfword[i], 16*i);
                }
            }
        } else {
            for (int i = 0; i < numberHalfWords; i++) {
                if (halfword[i] != 0xffff) {
                    if (needToClearRegister) {
                        m_assembler.movn<dataSize>(dest, ~halfword[i], 16*i);
                        needToClearRegister = false;
                    } else
                        m_assembler.movk<dataSize>(dest, halfword[i], 16*i);
                }
            }
        }
    }

    template<int datasize>
    ALWAYS_INLINE void loadUnsignedImmediate(RegisterID rt, RegisterID rn, unsigned pimm)
    {
        m_assembler.ldr<datasize>(rt, rn, pimm);
    }

    template<int datasize>
    ALWAYS_INLINE void loadUnscaledImmediate(RegisterID rt, RegisterID rn, int simm)
    {
        m_assembler.ldur<datasize>(rt, rn, simm);
    }

    template<int datasize>
    ALWAYS_INLINE void loadSignedAddressedByUnsignedImmediate(RegisterID rt, RegisterID rn, unsigned pimm)
    {
        loadUnsignedImmediate<datasize>(rt, rn, pimm);
    }

    template<int datasize>
    ALWAYS_INLINE void loadSignedAddressedByUnscaledImmediate(RegisterID rt, RegisterID rn, int simm)
    {
        loadUnscaledImmediate<datasize>(rt, rn, simm);
    }

    template<int datasize>
    ALWAYS_INLINE void storeUnsignedImmediate(RegisterID rt, RegisterID rn, unsigned pimm)
    {
        m_assembler.str<datasize>(rt, rn, pimm);
    }

    template<int datasize>
    ALWAYS_INLINE void storeUnscaledImmediate(RegisterID rt, RegisterID rn, int simm)
    {
        m_assembler.stur<datasize>(rt, rn, simm);
    }

    void moveWithFixedWidth(TrustedImm32 imm, RegisterID dest)
    {
        int32_t value = imm.m_value;
        m_assembler.movz<32>(dest, getHalfword(value, 0));
        m_assembler.movk<32>(dest, getHalfword(value, 1), 16);
    }

    void moveWithFixedWidth(TrustedImmPtr imm, RegisterID dest)
    {
        intptr_t value = reinterpret_cast<intptr_t>(imm.m_value);
        m_assembler.movz<64>(dest, getHalfword(value, 0));
        m_assembler.movk<64>(dest, getHalfword(value, 1), 16);
        m_assembler.movk<64>(dest, getHalfword(value, 2), 32);
        if (Assembler::MAX_POINTER_BITS > 48)
            m_assembler.movk<64>(dest, getHalfword(value, 3), 48);
    }

    void signExtend32ToPtrWithFixedWidth(int32_t value, RegisterID dest)
    {
        if (value >= 0) {
            m_assembler.movz<32>(dest, getHalfword(value, 0));
            m_assembler.movk<32>(dest, getHalfword(value, 1), 16);
        } else {
            m_assembler.movn<32>(dest, ~getHalfword(value, 0));
            m_assembler.movk<32>(dest, getHalfword(value, 1), 16);
        }
    }

    template<int datasize>
    ALWAYS_INLINE void load(const void* address, RegisterID dest)
    {
        intptr_t currentRegisterContents;
        if (cachedMemoryTempRegister().value(currentRegisterContents)) {
            intptr_t addressAsInt = reinterpret_cast<intptr_t>(address);
            intptr_t addressDelta = addressAsInt - currentRegisterContents;

            if (dest == memoryTempRegister)
                cachedMemoryTempRegister().invalidate();

            if (isInt<32>(addressDelta)) {
                if (Assembler::canEncodeSImmOffset(addressDelta)) {
                    loadUnscaledImmediate<datasize>(dest, memoryTempRegister, addressDelta);
                    return;
                }

                if (Assembler::canEncodePImmOffset<datasize>(addressDelta)) {
                    loadUnsignedImmediate<datasize>(dest, memoryTempRegister, addressDelta);
                    return;
                }
            }

            if ((addressAsInt & (~maskHalfWord0)) == (currentRegisterContents & (~maskHalfWord0))) {
                m_assembler.movk<64>(memoryTempRegister, addressAsInt & maskHalfWord0, 0);
                cachedMemoryTempRegister().setValue(reinterpret_cast<intptr_t>(address));
                if constexpr (datasize == 16)
                    m_assembler.ldrh(dest, memoryTempRegister, ARM64Registers::zr);
                else
                    m_assembler.ldr<datasize>(dest, memoryTempRegister, ARM64Registers::zr);
                return;
            }
        }

        move(TrustedImmPtr(address), memoryTempRegister);
        if (dest == memoryTempRegister)
            cachedMemoryTempRegister().invalidate();
        else
            cachedMemoryTempRegister().setValue(reinterpret_cast<intptr_t>(address));
        if constexpr (datasize == 16)
            m_assembler.ldrh(dest, memoryTempRegister, ARM64Registers::zr);
        else
            m_assembler.ldr<datasize>(dest, memoryTempRegister, ARM64Registers::zr);
    }

    template<int datasize>
    ALWAYS_INLINE void store(RegisterID src, const void* address)
    {
        ASSERT(src != memoryTempRegister);
        intptr_t currentRegisterContents;
        if (cachedMemoryTempRegister().value(currentRegisterContents)) {
            intptr_t addressAsInt = reinterpret_cast<intptr_t>(address);
            intptr_t addressDelta = addressAsInt - currentRegisterContents;

            if (isInt<32>(addressDelta)) {
                if (Assembler::canEncodeSImmOffset(addressDelta)) {
                    storeUnscaledImmediate<datasize>(src, memoryTempRegister, addressDelta);
                    return;
                }

                if (Assembler::canEncodePImmOffset<datasize>(addressDelta)) {
                    storeUnsignedImmediate<datasize>(src, memoryTempRegister, addressDelta);
                    return;
                }
            }

            if ((addressAsInt & (~maskHalfWord0)) == (currentRegisterContents & (~maskHalfWord0))) {
                m_assembler.movk<64>(memoryTempRegister, addressAsInt & maskHalfWord0, 0);
                cachedMemoryTempRegister().setValue(reinterpret_cast<intptr_t>(address));
                if constexpr (datasize == 16)
                    m_assembler.strh(src, memoryTempRegister, ARM64Registers::zr);
                else
                    m_assembler.str<datasize>(src, memoryTempRegister, ARM64Registers::zr);
                return;
            }
        }

        move(TrustedImmPtr(address), memoryTempRegister);
        cachedMemoryTempRegister().setValue(reinterpret_cast<intptr_t>(address));
        if constexpr (datasize == 16)
            m_assembler.strh(src, memoryTempRegister, ARM64Registers::zr);
        else
            m_assembler.str<datasize>(src, memoryTempRegister, ARM64Registers::zr);
    }

    template <int dataSize>
    ALWAYS_INLINE bool tryMoveUsingCacheRegisterContents(intptr_t immediate, CachedTempRegister& dest)
    {
        intptr_t currentRegisterContents;
        if (dest.value(currentRegisterContents)) {
            if (currentRegisterContents == immediate)
                return true;

            LogicalImmediate logicalImm = dataSize == 64 ? LogicalImmediate::create64(static_cast<uint64_t>(immediate)) : LogicalImmediate::create32(static_cast<uint32_t>(immediate));

            if (logicalImm.isValid()) {
                m_assembler.movi<dataSize>(dest.registerIDNoInvalidate(), logicalImm);
                dest.setValue(immediate);
                return true;
            }

            if ((immediate & maskUpperWord) == (currentRegisterContents & maskUpperWord)) {
                if ((immediate & maskHalfWord1) != (currentRegisterContents & maskHalfWord1))
                    m_assembler.movk<dataSize>(dest.registerIDNoInvalidate(), (immediate & maskHalfWord1) >> 16, 16);

                if ((immediate & maskHalfWord0) != (currentRegisterContents & maskHalfWord0))
                    m_assembler.movk<dataSize>(dest.registerIDNoInvalidate(), immediate & maskHalfWord0, 0);

                dest.setValue(immediate);
                return true;
            }
        }

        return false;
    }

    void moveToCachedReg(TrustedImm32 imm, CachedTempRegister& dest)
    {
        if (tryMoveUsingCacheRegisterContents<32>(static_cast<intptr_t>(imm.m_value), dest))
            return;

        moveInternal<TrustedImm32, int32_t>(imm, dest.registerIDNoInvalidate());
        dest.setValue(imm.m_value);
    }

    void moveToCachedReg(TrustedImmPtr imm, CachedTempRegister& dest)
    {
        if (tryMoveUsingCacheRegisterContents<64>(imm.asIntptr(), dest))
            return;

        moveInternal<TrustedImmPtr, intptr_t>(imm, dest.registerIDNoInvalidate());
        dest.setValue(imm.asIntptr());
    }

    void moveToCachedReg(TrustedImm64 imm, CachedTempRegister& dest)
    {
        if (tryMoveUsingCacheRegisterContents<64>(static_cast<intptr_t>(imm.m_value), dest))
            return;

        moveInternal<TrustedImm64, int64_t>(imm, dest.registerIDNoInvalidate());
        dest.setValue(imm.m_value);
    }

    template<int datasize>
    ALWAYS_INLINE bool tryLoadWithOffset(RegisterID rt, RegisterID rn, int32_t offset)
    {
        if (Assembler::canEncodeSImmOffset(offset)) {
            loadUnscaledImmediate<datasize>(rt, rn, offset);
            return true;
        }
        if (Assembler::canEncodePImmOffset<datasize>(offset)) {
            loadUnsignedImmediate<datasize>(rt, rn, static_cast<unsigned>(offset));
            return true;
        }
        return false;
    }

    template<int datasize>
    ALWAYS_INLINE bool tryLoadSignedWithOffset(RegisterID rt, RegisterID rn, int32_t offset)
    {
        if (Assembler::canEncodeSImmOffset(offset)) {
            loadSignedAddressedByUnscaledImmediate<datasize>(rt, rn, offset);
            return true;
        }
        if (Assembler::canEncodePImmOffset<datasize>(offset)) {
            loadSignedAddressedByUnsignedImmediate<datasize>(rt, rn, static_cast<unsigned>(offset));
            return true;
        }
        return false;
    }

    template<int datasize>
    ALWAYS_INLINE bool tryLoadWithOffset(FPRegisterID rt, RegisterID rn, int32_t offset)
    {
        if (Assembler::canEncodeSImmOffset(offset)) {
            m_assembler.ldur<datasize>(rt, rn, offset);
            return true;
        }
        if (Assembler::canEncodePImmOffset<datasize>(offset)) {
            m_assembler.ldr<datasize>(rt, rn, static_cast<unsigned>(offset));
            return true;
        }
        return false;
    }

    template<int datasize>
    ALWAYS_INLINE bool tryStoreWithOffset(RegisterID rt, RegisterID rn, int32_t offset)
    {
        if (Assembler::canEncodeSImmOffset(offset)) {
            storeUnscaledImmediate<datasize>(rt, rn, offset);
            return true;
        }
        if (Assembler::canEncodePImmOffset<datasize>(offset)) {
            storeUnsignedImmediate<datasize>(rt, rn, static_cast<unsigned>(offset));
            return true;
        }
        return false;
    }

    template<int datasize>
    ALWAYS_INLINE bool tryStoreWithOffset(FPRegisterID rt, RegisterID rn, int32_t offset)
    {
        if (Assembler::canEncodeSImmOffset(offset)) {
            m_assembler.stur<datasize>(rt, rn, offset);
            return true;
        }
        if (Assembler::canEncodePImmOffset<datasize>(offset)) {
            m_assembler.str<datasize>(rt, rn, static_cast<unsigned>(offset));
            return true;
        }
        return false;
    }
    
    template<int datasize>
    void loadLink(RegisterID src, RegisterID dest)
    {
        m_assembler.ldxr<datasize>(dest, src);
    }
    
    template<int datasize>
    void loadLinkAcq(RegisterID src, RegisterID dest)
    {
        m_assembler.ldaxr<datasize>(dest, src);
    }
    
    template<int datasize>
    void storeCond(RegisterID src, RegisterID dest, RegisterID result)
    {
        m_assembler.stxr<datasize>(src, dest, result);
    }
    
    template<int datasize>
    void storeCondRel(RegisterID src, RegisterID dest, RegisterID result)
    {
        m_assembler.stlxr<datasize>(result, src, dest);
    }
    
    template<int datasize>
    void signExtend(RegisterID src, RegisterID dest)
    {
        move(src, dest);
    }
    
    template<int datasize>
    Jump branch(RelationalCondition cond, RegisterID left, RegisterID right)
    {
        return branch32(cond, left, right);
    }
    
    template<int datasize>
    void atomicStrongCAS(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, Address address, RegisterID result)
    {
        signExtend<datasize>(expectedAndResult, expectedAndResult);
        
        RegisterID simpleAddress = extractSimpleAddress(address);
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        
        Label reloop = label();
        loadLinkAcq<datasize>(simpleAddress, tmp);
        Jump failure = branch<datasize>(NotEqual, expectedAndResult, tmp);
        
        storeCondRel<datasize>(newValue, simpleAddress, result);
        branchTest32(NonZero, result).linkTo(reloop, this);
        move(TrustedImm32(cond == Success), result);
        Jump done = jump();
        
        failure.link(this);
        move(tmp, expectedAndResult);
        storeCondRel<datasize>(tmp, simpleAddress, result);
        branchTest32(NonZero, result).linkTo(reloop, this);
        move(TrustedImm32(cond == Failure), result);
        
        done.link(this);
    }
    
    template<int datasize, typename AddressType>
    void atomicRelaxedStrongCAS(StatusCondition cond, RegisterID expectedAndResult, RegisterID newValue, AddressType address, RegisterID result)
    {
        signExtend<datasize>(expectedAndResult, expectedAndResult);
        
        RegisterID simpleAddress = extractSimpleAddress(address);
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        
        Label reloop = label();
        loadLink<datasize>(simpleAddress, tmp);
        Jump failure = branch<datasize>(NotEqual, expectedAndResult, tmp);
        
        storeCond<datasize>(newValue, simpleAddress, result);
        branchTest32(NonZero, result).linkTo(reloop, this);
        move(TrustedImm32(cond == Success), result);
        Jump done = jump();
        
        failure.link(this);
        move(tmp, expectedAndResult);
        move(TrustedImm32(cond == Failure), result);
        
        done.link(this);
    }
    
    template<int datasize, typename AddressType>
    JumpList branchAtomicWeakCAS(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        signExtend<datasize>(expectedAndClobbered, expectedAndClobbered);
        
        RegisterID simpleAddress = extractSimpleAddress(address);
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        
        JumpList success;
        JumpList failure;

        loadLinkAcq<datasize>(simpleAddress, tmp);
        failure.append(branch<datasize>(NotEqual, expectedAndClobbered, tmp));
        storeCondRel<datasize>(newValue, simpleAddress, expectedAndClobbered);
        
        switch (cond) {
        case Success:
            success.append(branchTest32(Zero, expectedAndClobbered));
            failure.link(this);
            return success;
        case Failure:
            failure.append(branchTest32(NonZero, expectedAndClobbered));
            return failure;
        }
        
        RELEASE_ASSERT_NOT_REACHED();
    }
    
    template<int datasize, typename AddressType>
    JumpList branchAtomicRelaxedWeakCAS(StatusCondition cond, RegisterID expectedAndClobbered, RegisterID newValue, AddressType address)
    {
        signExtend<datasize>(expectedAndClobbered, expectedAndClobbered);
        
        RegisterID simpleAddress = extractSimpleAddress(address);
        RegisterID tmp = getCachedDataTempRegisterIDAndInvalidate();
        
        JumpList success;
        JumpList failure;

        loadLink<datasize>(simpleAddress, tmp);
        failure.append(branch<datasize>(NotEqual, expectedAndClobbered, tmp));
        storeCond<datasize>(newValue, simpleAddress, expectedAndClobbered);
        
        switch (cond) {
        case Success:
            success.append(branchTest32(Zero, expectedAndClobbered));
            failure.link(this);
            return success;
        case Failure:
            failure.append(branchTest32(NonZero, expectedAndClobbered));
            return failure;
        }
        
        RELEASE_ASSERT_NOT_REACHED();
    }
    
    RegisterID extractSimpleAddress(ImplicitAddress address)
    {
        if (!address.offset)
            return address.base;
        
        signExtend32ToPtr(TrustedImm32(address.offset), getCachedMemoryTempRegisterIDAndInvalidate());
        add64(address.base, memoryTempRegister);
        return memoryTempRegister;
    }

    // This uses both the memory and data temp, but only returns the memorty temp. So you can use the
    // data temp after this finishes.
    RegisterID extractSimpleAddress(BaseIndex address)
    {
        RegisterID result = getCachedMemoryTempRegisterIDAndInvalidate();
        lshift64(address.index, TrustedImm32(address.scale), result);
        add64(address.base, result);
        add64(TrustedImm32(address.offset), result);
        return result;
    }

    Jump jumpAfterFloatingPointCompare(DoubleCondition cond)
    {
        if (cond == DoubleNotEqualAndOrdered) {
            // ConditionNE jumps if NotEqual *or* unordered - force the unordered cases not to jump.
            Jump unordered = makeBranch(Assembler::ConditionVS);
            Jump result = makeBranch(Assembler::ConditionNE);
            unordered.link(this);
            return result;
        }
        if (cond == DoubleEqualOrUnordered) {
            Jump unordered = makeBranch(Assembler::ConditionVS);
            Jump notEqual = makeBranch(Assembler::ConditionNE);
            unordered.link(this);
            // We get here if either unordered or equal.
            Jump result = jump();
            notEqual.link(this);
            return result;
        }
        return makeBranch(cond);
    }

    template<typename Function>
    void floatingPointCompare(DoubleCondition cond, FPRegisterID left, FPRegisterID right, RegisterID dest, Function compare)
    {
        if (cond == DoubleNotEqualAndOrdered) {
            // ConditionNE sets 1 if NotEqual *or* unordered - force the unordered cases not to set 1.
            move(TrustedImm32(0), dest);
            compare(left, right);
            Jump unordered = makeBranch(Assembler::ConditionVS);
            m_assembler.cset<32>(dest, Assembler::ConditionNE);
            unordered.link(this);
            return;
        }
        if (cond == DoubleEqualOrUnordered) {
            // ConditionEQ sets 1 only if Equal - force the unordered cases to set 1 too.
            move(TrustedImm32(1), dest);
            compare(left, right);
            Jump unordered = makeBranch(Assembler::ConditionVS);
            m_assembler.cset<32>(dest, Assembler::ConditionEQ);
            unordered.link(this);
            return;
        }
        compare(left, right);
        m_assembler.cset<32>(dest, ARM64Condition(cond));
    }

    friend class LinkBuffer;

    template<PtrTag tag>
    static void linkCall(void* code, Call call, FunctionPtr<tag> function)
    {
        if (!call.isFlagSet(Call::Near))
            Assembler::linkPointer(code, call.m_label.labelAtOffset(REPATCH_OFFSET_CALL_TO_POINTER), function.executableAddress());
        else if (call.isFlagSet(Call::Tail))
            Assembler::linkJump(code, call.m_label, function.template retaggedExecutableAddress<NoPtrTag>());
        else
            Assembler::linkCall(code, call.m_label, function.template retaggedExecutableAddress<NoPtrTag>());
    }

    JS_EXPORT_PRIVATE static void collectCPUFeatures();

    JS_EXPORT_PRIVATE static CPUIDCheckState s_jscvtCheckState;

    CachedTempRegister m_dataMemoryTempRegister;
    CachedTempRegister m_cachedMemoryTempRegister;
    bool m_makeJumpPatchable;
};

// Extend the {load,store}{Unsigned,Unscaled}Immediate templated general register methods to cover all load/store sizes
template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadUnsignedImmediate<8>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.ldrb(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadUnsignedImmediate<16>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.ldrh(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadSignedAddressedByUnsignedImmediate<8>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.ldrsb<64>(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadSignedAddressedByUnsignedImmediate<16>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.ldrsh<64>(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadUnscaledImmediate<8>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.ldurb(rt, rn, simm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadUnscaledImmediate<16>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.ldurh(rt, rn, simm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadSignedAddressedByUnscaledImmediate<8>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.ldursb<64>(rt, rn, simm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::loadSignedAddressedByUnscaledImmediate<16>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.ldursh<64>(rt, rn, simm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::storeUnsignedImmediate<8>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.strb(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::storeUnsignedImmediate<16>(RegisterID rt, RegisterID rn, unsigned pimm)
{
    m_assembler.strh(rt, rn, pimm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::storeUnscaledImmediate<8>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.sturb(rt, rn, simm);
}

template<>
ALWAYS_INLINE void MacroAssemblerARM64::storeUnscaledImmediate<16>(RegisterID rt, RegisterID rn, int simm)
{
    m_assembler.sturh(rt, rn, simm);
}

template<>
inline void MacroAssemblerARM64::signExtend<8>(RegisterID src, RegisterID dest)
{
    signExtend8To32(src, dest);
}

template<>
inline void MacroAssemblerARM64::signExtend<16>(RegisterID src, RegisterID dest)
{
    signExtend16To32(src, dest);
}

template<>
inline MacroAssemblerARM64::Jump MacroAssemblerARM64::branch<64>(RelationalCondition cond, RegisterID left, RegisterID right)
{
    return branch64(cond, left, right);
}

} // namespace JSC

#endif // ENABLE(ASSEMBLER)