ChakraCore/lib/Backend/IRBuilderAsmJs.cpp

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft Corporation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------

#include "Backend.h"
#ifdef ASMJS_PLAT
#include "ByteCode/OpCodeUtilAsmJs.h"

void
IRBuilderAsmJs::Build()
{
    m_funcAlloc = m_func->m_alloc;

    NoRecoverMemoryJitArenaAllocator localAlloc(_u("BE-IRBuilder"), m_funcAlloc->GetPageAllocator(), Js::Throw::OutOfMemory);
    m_tempAlloc = &localAlloc;

    uint32 offset;
    uint32 statementIndex = m_statementReader.GetStatementIndex();

    m_argStack = JitAnew(m_tempAlloc, SList<IR::Instr *>, m_tempAlloc);
    m_tempList = JitAnew(m_tempAlloc, SList<IR::Instr *>, m_tempAlloc);
    m_argOffsetStack = JitAnew(m_tempAlloc, SList<int32>, m_tempAlloc);

    m_branchRelocList = JitAnew(m_tempAlloc, SList<BranchReloc *>, m_tempAlloc);

    m_switchBuilder.Init(m_func, m_tempAlloc, true);

    m_firstVarConst = 0;
    Js::RegSlot tempCount = 0;
    m_firstsType[0] = m_firstVarConst + AsmJsRegSlots::RegCount;
    for (int i = 0, j = 1; i < WAsmJs::LIMIT; ++i, ++j)
    {
        WAsmJs::Types type = (WAsmJs::Types)i;
        const auto typedInfo = m_asmFuncInfo->GetTypedSlotInfo(type);
        m_firstsType[j] = typedInfo.constCount;
        m_firstsType[j + WAsmJs::LIMIT] = typedInfo.varCount;
        m_firstsType[j + 2 * WAsmJs::LIMIT] = typedInfo.tmpCount;
        tempCount += typedInfo.tmpCount;
    }
    // Fixup the firsts by looking at the previous value
    for (int i = 1; i < m_firstsTypeCount; ++i)
    {
        m_firstsType[i] += m_firstsType[i - 1];
    }

    m_firstIRTemp = m_firstsType[m_firstsTypeCount - 1];

    m_simdOpcodesMap = JitAnewArrayZ(m_tempAlloc, Js::OpCode, Js::Simd128AsmJsOpcodeCount());
    {

#define MACRO_SIMD(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr, ...) m_simdOpcodesMap[(uint32)(Js::OpCodeAsmJs::opcode - Js::OpCodeAsmJs::Simd128_Start)] = Js::OpCode::opcode;

#define MACRO_SIMD_WMS(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr, ...) MACRO_SIMD(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr)

        // append extended opcodes
#define MACRO_SIMD_EXTEND(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr, ...) \
    m_simdOpcodesMap[(uint32)(Js::OpCodeAsmJs::opcode - Js::OpCodeAsmJs::Simd128_Start_Extend) + (Js::OpCodeAsmJs::Simd128_End - Js::OpCodeAsmJs::Simd128_Start + 1)] = Js::OpCode::opcode;

#define MACRO_SIMD_EXTEND_WMS(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr, ...) MACRO_SIMD_EXTEND(opcode, asmjsLayout, opCodeAttrAsmJs, OpCodeAttr)

#include "ByteCode/OpCodesSimd.h"

    }

    // we will be using lower space for type specialized syms, so bump up where new temp syms can be created
    m_func->m_symTable->IncreaseStartingID(m_firstIRTemp - m_func->m_symTable->GetMaxSymID());

    if (tempCount > 0)
    {
        m_tempMap = (SymID*)m_tempAlloc->AllocZero(sizeof(SymID) * tempCount);
        m_fbvTempUsed = BVFixed::New<JitArenaAllocator>(tempCount, m_tempAlloc);
    }
    else
    {
        m_tempMap = nullptr;
        m_fbvTempUsed = nullptr;
    }

    m_func->m_headInstr = IR::EntryInstr::New(Js::OpCode::FunctionEntry, m_func);
    m_func->m_exitInstr = IR::ExitInstr::New(Js::OpCode::FunctionExit, m_func);
    m_func->m_tailInstr = m_func->m_exitInstr;
    m_func->m_headInstr->InsertAfter(m_func->m_tailInstr);
    m_func->m_isLeaf = true;  // until proven otherwise

    m_functionStartOffset = m_jnReader.GetCurrentOffset();
    m_lastInstr = m_func->m_headInstr;

    AssertMsg(sizeof(SymID) >= sizeof(Js::RegSlot), "sizeof(SymID) != sizeof(Js::RegSlot)!!");

    offset = m_functionStartOffset;

    // Skip the last EndOfBlock opcode
    // EndOfBlock opcode has same value in Asm
    Assert(!OpCodeAttr::HasMultiSizeLayout(Js::OpCode::EndOfBlock));
    uint32 lastOffset = m_func->GetJITFunctionBody()->GetByteCodeLength() - Js::OpCodeUtil::EncodedSize(Js::OpCode::EndOfBlock, Js::SmallLayout);
    uint32 offsetToInstructionCount = lastOffset;
    if (this->IsLoopBody())
    {
        // LdSlot needs to cover all the register, including the temps, because we might treat
        // those as if they are local for the value of the with statement
        this->m_ldSlots = BVFixed::New<JitArenaAllocator>(GetLastTmp(WAsmJs::LastType), m_tempAlloc);
        this->m_stSlots = BVFixed::New<JitArenaAllocator>(GetFirstTmp(WAsmJs::FirstType), m_tempAlloc);
        this->m_loopBodyRetIPSym = StackSym::New(TyInt32, this->m_func);
#if DBG
        uint32 tmpCount = GetLastTmp(WAsmJs::LastType) - GetFirstTmp(WAsmJs::FirstType);
        if (tmpCount != 0)
        {
            this->m_usedAsTemp = BVFixed::New<JitArenaAllocator>(tmpCount, m_tempAlloc);
        }
#endif
        lastOffset = m_func->GetWorkItem()->GetLoopHeader()->endOffset;
        // Ret is created at lastOffset + 1, so we need lastOffset + 2 entries
        offsetToInstructionCount = lastOffset + 2;
    }

#if DBG
    m_offsetToInstructionCount = offsetToInstructionCount;
#endif
    m_offsetToInstruction = JitAnewArrayZ(m_tempAlloc, IR::Instr *, offsetToInstructionCount);

    LoadNativeCodeData();

    BuildConstantLoads();
    if (!this->IsLoopBody() && m_func->GetJITFunctionBody()->HasImplicitArgIns())
    {
        BuildImplicitArgIns();
    }

    if (m_statementReader.AtStatementBoundary(&m_jnReader))
    {
        statementIndex = AddStatementBoundary(statementIndex, offset);
    }

    Js::LayoutSize layoutSize;
    for (Js::OpCodeAsmJs newOpcode = m_jnReader.ReadAsmJsOp(layoutSize); (uint)m_jnReader.GetCurrentOffset() <= lastOffset; newOpcode = m_jnReader.ReadAsmJsOp(layoutSize))
    {
        Assert(newOpcode != Js::OpCodeAsmJs::EndOfBlock);

        AssertOrFailFastMsg(Js::OpCodeUtilAsmJs::IsValidByteCodeOpcode(newOpcode), "Error getting opcode from m_jnReader.Op()");

        uint layoutAndSize = layoutSize * Js::OpLayoutTypeAsmJs::Count + Js::OpCodeUtilAsmJs::GetOpCodeLayout(newOpcode);
        switch (layoutAndSize)
        {
#define LAYOUT_TYPE(layout) \
        case Js::OpLayoutTypeAsmJs::layout: \
            Assert(layoutSize == Js::SmallLayout); \
            Build##layout(newOpcode, offset); \
            break;
#define LAYOUT_TYPE_WMS(layout) \
        case Js::SmallLayout * Js::OpLayoutTypeAsmJs::Count + Js::OpLayoutTypeAsmJs::layout: \
            Build##layout<Js::SmallLayoutSizePolicy>(newOpcode, offset); \
            break; \
        case Js::MediumLayout * Js::OpLayoutTypeAsmJs::Count + Js::OpLayoutTypeAsmJs::layout: \
            Build##layout<Js::MediumLayoutSizePolicy>(newOpcode, offset); \
            break; \
        case Js::LargeLayout * Js::OpLayoutTypeAsmJs::Count + Js::OpLayoutTypeAsmJs::layout: \
            Build##layout<Js::LargeLayoutSizePolicy>(newOpcode, offset); \
            break;
#define EXCLUDE_FRONTEND_LAYOUT
#include "ByteCode/LayoutTypesAsmJs.h"

        default:
            AssertMsg(UNREACHED, "Unimplemented layout");
            Js::Throw::InternalError();
            break;
        }
        offset = m_jnReader.GetCurrentOffset();

        if (m_statementReader.AtStatementBoundary(&m_jnReader))
        {
            statementIndex = AddStatementBoundary(statementIndex, offset);
        }

    }

    if (Js::Constants::NoStatementIndex != statementIndex)
    {
        statementIndex = AddStatementBoundary(statementIndex, Js::Constants::NoByteCodeOffset);
    }

    if (IsLoopBody())
    {
        // Insert the LdSlot/StSlot and Ret
        IR::Opnd * retOpnd = this->InsertLoopBodyReturnIPInstr(offset, offset);

        // Restore and Ret are at the last offset + 1
        GenerateLoopBodySlotAccesses(lastOffset + 1);

        IR::Instr *      retInstr = IR::Instr::New(Js::OpCode::Ret, m_func);
        retInstr->SetSrc1(retOpnd);
        this->AddInstr(retInstr, lastOffset + 1);
    }

    // Now fix up the targets for all the branches we've introduced.
    InsertLabels();

    // Now that we know whether the func is a leaf or not, decide whether we'll emit fast paths.
    // Do this once and for all, per-func, since the source size on the ThreadContext will be
    // changing while we JIT.
    if (m_func->IsTopFunc())
    {
        m_func->SetDoFastPaths();
    }
}

void
IRBuilderAsmJs::LoadNativeCodeData()
{
    Assert(m_func->IsTopFunc());
    if (m_func->IsOOPJIT())
    {
        IR::RegOpnd * nativeDataOpnd = IR::RegOpnd::New(TyVar, m_func);
        IR::Instr * instr = IR::Instr::New(Js::OpCode::LdNativeCodeData, nativeDataOpnd, m_func);
        this->AddInstr(instr, Js::Constants::NoByteCodeOffset);
        m_func->SetNativeCodeDataSym(nativeDataOpnd->GetStackSym());
    }
}

void
IRBuilderAsmJs::AddInstr(IR::Instr * instr, uint32 offset)
{
    m_lastInstr->InsertAfter(instr);
    if (offset != Js::Constants::NoByteCodeOffset)
    {
        Assert(offset < m_offsetToInstructionCount);
        if (m_offsetToInstruction[offset] == nullptr)
        {
            m_offsetToInstruction[offset] = instr;
        }
        else
        {
            Assert(m_lastInstr->GetByteCodeOffset() == offset);
        }
        instr->SetByteCodeOffset(offset);
    }
    else
    {
        instr->SetByteCodeOffset(m_lastInstr->GetByteCodeOffset());
    }
    m_lastInstr = instr;

    Func *topFunc = m_func->GetTopFunc();
    if (!topFunc->GetHasTempObjectProducingInstr())
    {
        if (OpCodeAttr::TempObjectProducing(instr->m_opcode))
        {
            topFunc->SetHasTempObjectProducingInstr(true);
        }
    }

#if DBG_DUMP
    if (Js::Configuration::Global.flags.Trace.IsEnabled(Js::IRBuilderPhase, m_func->GetTopFunc()->GetSourceContextId(), m_func->GetTopFunc()->GetLocalFunctionId()))
    {
        instr->Dump();
    }
#endif
}

IR::RegOpnd *
IRBuilderAsmJs::BuildDstOpnd(Js::RegSlot dstRegSlot, IRType type)
{
    SymID symID;
    if (RegIsTemp(dstRegSlot))
    {
#if DBG
        if (this->IsLoopBody())
        {
            // If we are doing loop body, and a temp reg slot is loaded via LdSlot
            // That means that we have detected that the slot is live coming in to the loop.
            // This would only happen for the value of a "with" statement, so there shouldn't
            // be any def for those
            Assert(!this->m_ldSlots->Test(dstRegSlot));
            this->m_usedAsTemp->Set(dstRegSlot - GetFirstTmp(WAsmJs::FirstType));
        }
#endif
        // This is a def of a temp. Create a new sym ID for it if it's been used since its last def.
        //     !!!NOTE: always process an instruction's temp uses before its temp defs!!!
        if (GetTempUsed(dstRegSlot))
        {
            symID = m_func->m_symTable->NewID();
            SetTempUsed(dstRegSlot, FALSE);
            SetMappedTemp(dstRegSlot, symID);
        }
        else
        {
            symID = GetMappedTemp(dstRegSlot);
            // The temp hasn't been used since its last def. There are 2 possibilities:
            if (symID == 0)
            {
                // First time we've seen the temp. Just use the number that the front end gave it.
                symID = static_cast<SymID>(dstRegSlot);
                SetMappedTemp(dstRegSlot, symID);
            }
            else if (IRType_IsSimd128(type))
            {
                //In Asm.js, SIMD register space is untyped, so we could have SIMD temp registers.
                //Make sure that the StackSym types matches before reusing simd temps.
                StackSym *  stackSym = m_func->m_symTable->FindStackSym(symID);
                if (!stackSym || stackSym->GetType() != type)
                {
                    symID = m_func->m_symTable->NewID();
                    SetMappedTemp(dstRegSlot, symID);
                }
            }
        }
    }
    else
    {
        symID = static_cast<SymID>(dstRegSlot);
        if (RegIsConstant(dstRegSlot))
        {
            // Don't need to track constant registers for bailout. Don't set the byte code register for constant.
            dstRegSlot = Js::Constants::NoRegister;
        }
        else if (IsLoopBody() && RegIsVar(dstRegSlot))
        {
            // Loop body and not constants
            this->m_stSlots->Set(symID);
            // We need to make sure that the symbols is loaded as well
            // so that the sym will be defined on all path.
            this->EnsureLoopBodyAsmJsLoadSlot(symID, type);
        }
        else
        {
            Assert(!IsLoopBody() || dstRegSlot == 0); // if loop body then one of the above two conditions should hold true
        }
    }

    //Simd return values of different IR types share the same reg slot.
    //To avoid symbol type mismatch, use the stack symbol with a dummy simd type.
    if (RegIsSimd128ReturnVar(symID))
    {
        type = TySimd128F4;
    }
    StackSym * symDst = StackSym::FindOrCreate(symID, dstRegSlot, m_func, type);
    // Always reset isSafeThis to false.  We'll set it to true for singleDef cases,
    // but want to reset it to false if it is multi-def.
    // NOTE: We could handle the multiDef if they are all safe, but it probably isn't very common.
    symDst->m_isSafeThis = false;

    IR::RegOpnd *regOpnd = IR::RegOpnd::New(symDst, type, m_func);
    return regOpnd;
}

IR::RegOpnd *
IRBuilderAsmJs::BuildSrcOpnd(Js::RegSlot srcRegSlot, IRType type)
{
    StackSym * symSrc = m_func->m_symTable->FindStackSym(BuildSrcStackSymID(srcRegSlot, type));
    AssertMsg(symSrc, "Tried to use an undefined stack slot?");
        IR::RegOpnd * regOpnd = IR::RegOpnd::New(symSrc, type, m_func);

    return regOpnd;
}

IR::RegOpnd *
IRBuilderAsmJs::BuildIntConstOpnd(Js::RegSlot regSlot)
{
    Js::Var * constTable = (Js::Var*)m_func->GetJITFunctionBody()->GetConstTable();
    const WAsmJs::TypedSlotInfo& info = m_func->GetJITFunctionBody()->GetAsmJsInfo()->GetTypedSlotInfo(WAsmJs::INT32);
    Assert(info.constSrcByteOffset != Js::Constants::InvalidOffset);
    int* intConstTable = reinterpret_cast<int*>(((byte*)constTable) + info.constSrcByteOffset);
    Js::RegSlot srcReg = GetTypedRegFromRegSlot(regSlot, WAsmJs::INT32);
    Assert(srcReg >= Js::FunctionBody::FirstRegSlot && srcReg < info.constCount);
    const int32 value = intConstTable[srcReg];
    IR::IntConstOpnd *opnd = IR::IntConstOpnd::New(value, TyInt32, m_func);

    return (IR::RegOpnd*)opnd;
}

SymID
IRBuilderAsmJs::BuildSrcStackSymID(Js::RegSlot regSlot, IRType type /*= IRType::TyVar*/)
{
    SymID symID;

    if (this->RegIsTemp(regSlot))
    {
        // This is a use of a temp. Map the reg slot to its sym ID.
        //     !!!NOTE: always process an instruction's temp uses before its temp defs!!!
        symID = this->GetMappedTemp(regSlot);
        if (symID == 0)
        {
            // We might have temps that are live through the loop body via "with" statement
            // We need to treat those as if they are locals and don't remap them
            Assert(this->IsLoopBody());
            Assert(!this->m_usedAsTemp->Test(regSlot - GetFirstTmp(WAsmJs::FirstType)));

            symID = static_cast<SymID>(regSlot);
            this->SetMappedTemp(regSlot, symID);
            this->EnsureLoopBodyAsmJsLoadSlot(symID, type);
        }
        this->SetTempUsed(regSlot, TRUE);
    }
    else
    {
        symID = static_cast<SymID>(regSlot);
        if (IsLoopBody() && RegIsVar(regSlot))
        {
            this->EnsureLoopBodyAsmJsLoadSlot(symID, type);

        }
        else
        {
            Assert(!IsLoopBody() || this->RegIsConstant(regSlot) || regSlot == 0);
        }
    }
    return symID;

}

IR::SymOpnd *
IRBuilderAsmJs::BuildFieldOpnd(Js::RegSlot reg, Js::PropertyId propertyId, PropertyKind propertyKind, IRType type, bool scale)
{
    Js::PropertyId scaledPropertyId = propertyId;
    if (scale)
    {
        scaledPropertyId *= TySize[type];
    }
    PropertySym * propertySym = BuildFieldSym(reg, scaledPropertyId, propertyKind);
    IR::SymOpnd * symOpnd = IR::SymOpnd::New(propertySym, type, m_func);

    return symOpnd;
}

PropertySym *
IRBuilderAsmJs::BuildFieldSym(Js::RegSlot reg, Js::PropertyId propertyId, PropertyKind propertyKind)
{
    SymID symId = BuildSrcStackSymID(reg);

    AssertMsg(m_func->m_symTable->FindStackSym(symId), "Tried to use an undefined stacksym?");

    PropertySym * propertySym = PropertySym::FindOrCreate(symId, propertyId, (Js::PropertyIdIndexType)-1, (uint)-1, propertyKind, m_func);
    return propertySym;
}

uint
IRBuilderAsmJs::AddStatementBoundary(uint statementIndex, uint offset)
{
    if (m_func->GetJITFunctionBody()->IsWasmFunction())
    {
        return 0;
    }
    IR::PragmaInstr* pragmaInstr = IR::PragmaInstr::New(Js::OpCode::StatementBoundary, statementIndex, m_func);
    this->AddInstr(pragmaInstr, offset);

    return m_statementReader.MoveNextStatementBoundary();
}

Js::RegSlot IRBuilderAsmJs::GetTypedRegFromRegSlot(Js::RegSlot reg, WAsmJs::Types type)
{
    const auto typedInfo = m_asmFuncInfo->GetTypedSlotInfo(type);
    Js::RegSlot srcReg = reg;
    if (RegIsTypedVar(reg, type))
    {
        srcReg = reg - GetFirstVar(type);
        Assert(srcReg < typedInfo.varCount);
        srcReg += typedInfo.constCount;
    }
    else if (RegIsTemp(reg))
    {
        srcReg = reg - GetFirstTmp(type);
        Assert(srcReg < typedInfo.tmpCount);
        srcReg += typedInfo.varCount + typedInfo.constCount;
    }
    else if (RegIsConstant(reg))
    {
        srcReg = reg - GetFirstConst(type);
        Assert(srcReg < typedInfo.constCount);
    }
    return srcReg;
}

Js::RegSlot
IRBuilderAsmJs::GetRegSlotFromTypedReg(Js::RegSlot srcReg, WAsmJs::Types type)
{
    const auto typedInfo = m_asmFuncInfo->GetTypedSlotInfo(type);
    Js::RegSlot reg;
    if (srcReg < typedInfo.constCount)
    {
        reg = srcReg + GetFirstConst(type);
        Assert(reg >= GetFirstConst(type) && reg < GetLastConst(type));
        return reg;
    }

    srcReg -= typedInfo.constCount;
    if (srcReg < typedInfo.varCount)
    {
        reg = srcReg + GetFirstVar(type);
        Assert(reg >= GetFirstVar(type) && reg < GetLastVar(type));
        return reg;
    }

    srcReg -= typedInfo.varCount;
    Assert(srcReg < typedInfo.tmpCount);

    reg = srcReg + GetFirstTmp(type);
    Assert(reg >= GetFirstTmp(type) && reg < GetLastTmp(type));
    return reg;
}

IR::Instr *
IRBuilderAsmJs::AddExtendedArg(IR::RegOpnd *src1, IR::RegOpnd *src2, uint32 offset)
{
    Assert(src1);
    IR::RegOpnd * dst = IR::RegOpnd::New(src1->GetType(), m_func);
    dst->SetValueType(src1->GetValueType());

    IR::Instr * instr = IR::Instr::New(Js::OpCode::ExtendArg_A, dst, src1, m_func);
    if (src2)
    {
        instr->SetSrc2(src2);
    }
    AddInstr(instr, offset);
    return instr;
}

Js::RegSlot
IRBuilderAsmJs::GetRegSlotFromVarReg(Js::RegSlot srcVarReg)
{
    Js::RegSlot reg;
    if (srcVarReg < (Js::RegSlot)(AsmJsRegSlots::RegCount - 1))
    {
        reg = srcVarReg + m_firstVarConst;
        Assert(reg >= m_firstVarConst && reg < GetFirstConst(WAsmJs::FirstType));
    }
    else
    {
        reg = srcVarReg - AsmJsRegSlots::RegCount + GetFirstTmp(WAsmJs::FirstType) - 1;
    }
    return reg;
}

SymID
IRBuilderAsmJs::GetMappedTemp(Js::RegSlot reg)
{
    AssertMsg(RegIsTemp(reg), "Processing non-temp reg as a temp?");
    AssertMsg(m_tempMap, "Processing non-temp reg without a temp map?");

    return m_tempMap[reg - GetFirstTmp(WAsmJs::FirstType)];
}

void
IRBuilderAsmJs::SetMappedTemp(Js::RegSlot reg, SymID tempId)
{
    AssertMsg(RegIsTemp(reg), "Processing non-temp reg as a temp?");
    AssertMsg(m_tempMap, "Processing non-temp reg without a temp map?");

    m_tempMap[reg - GetFirstTmp(WAsmJs::FirstType)] = tempId;
}

BOOL
IRBuilderAsmJs::GetTempUsed(Js::RegSlot reg)
{
    AssertMsg(RegIsTemp(reg), "Processing non-temp reg as a temp?");
    AssertMsg(m_fbvTempUsed, "Processing non-temp reg without a used BV?");

    return m_fbvTempUsed->Test(reg - GetFirstTmp(WAsmJs::FirstType));
}

void
IRBuilderAsmJs::SetTempUsed(Js::RegSlot reg, BOOL used)
{
    AssertMsg(RegIsTemp(reg), "Processing non-temp reg as a temp?");
    AssertMsg(m_fbvTempUsed, "Processing non-temp reg without a used BV?");

    if (used)
    {
        m_fbvTempUsed->Set(reg - GetFirstTmp(WAsmJs::FirstType));
    }
    else
    {
        m_fbvTempUsed->Clear(reg - GetFirstTmp(WAsmJs::FirstType));
    }
}

BOOL
IRBuilderAsmJs::RegIsTemp(Js::RegSlot reg)
{
    return reg >= GetFirstTmp(WAsmJs::FirstType);
}

BOOL
IRBuilderAsmJs::RegIsVar(Js::RegSlot reg)
{
    for (int i = 0; i < WAsmJs::LIMIT; ++i)
    {
        if (RegIsTypedVar(reg, (WAsmJs::Types)i))
        {
            return true;
        }
    }
    return false;
}

BOOL
IRBuilderAsmJs::RegIsTypedVar(Js::RegSlot reg, WAsmJs::Types type)
{
    return reg >= GetFirstVar(type) && reg < GetLastVar(type);
}

bool
IRBuilderAsmJs::RegIsSimd128ReturnVar(Js::RegSlot reg)
{
    return (reg == GetFirstConst(WAsmJs::SIMD) &&
            Js::AsmJsRetType(m_asmFuncInfo->GetRetType()).toVarType().isSIMD());
}
BOOL
IRBuilderAsmJs::RegIsConstant(Js::RegSlot reg)
{
    return (reg > 0 && reg < GetLastConst(WAsmJs::LastType));
}

BranchReloc *
IRBuilderAsmJs::AddBranchInstr(IR::BranchInstr * branchInstr, uint32 offset, uint32 targetOffset)
{
    //
    // Loop jitting would be done only till the LoopEnd
    // Any branches beyond that offset are for the return statement
    //
    if (IsLoopBodyOuterOffset(targetOffset))
    {
        // if we have loaded the loop IP sym from the ProfiledLoopEnd then don't add it here
        if (!IsLoopBodyReturnIPInstr(m_lastInstr))
        {
            this->InsertLoopBodyReturnIPInstr(targetOffset, offset);
        }

        // Jump the restore StSlot and Ret instruction
        targetOffset = GetLoopBodyExitInstrOffset();
    }
    BranchReloc *  reloc = nullptr;
    reloc = CreateRelocRecord(branchInstr, offset, targetOffset);

    AddInstr(branchInstr, offset);
    return reloc;
}

BranchReloc *
IRBuilderAsmJs::CreateRelocRecord(IR::BranchInstr * branchInstr, uint32 offset, uint32 targetOffset)
{
    BranchReloc * reloc = JitAnew(m_tempAlloc, BranchReloc, branchInstr, offset, targetOffset);
    m_branchRelocList->Prepend(reloc);
    return reloc;
}

void
IRBuilderAsmJs::BuildHeapBufferReload(uint32 offset)
{

#ifdef ENABLE_WASM
    if(m_func->GetJITFunctionBody()->IsWasmFunction())
    {
        // WebAssembly.Memory
        IR::RegOpnd * dstOpnd = BuildDstOpnd(AsmJsRegSlots::WasmMemoryReg, TyVar);
        IR::Opnd * srcOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::ModuleMemReg, TyVar), (int32)Js::WebAssemblyModule::GetMemoryOffset(), TyVar, m_func);
        IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        // ArrayBuffer
        dstOpnd = BuildDstOpnd(AsmJsRegSlots::ArrayReg, TyVar);
        srcOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::WasmMemoryReg, TyVar), Js::WebAssemblyMemory::GetOffsetOfArrayBuffer(), TyVar, m_func);
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);
    }
    else
#endif
    {
        // ArrayBuffer
        IR::RegOpnd * dstOpnd = BuildDstOpnd(AsmJsRegSlots::ArrayReg, TyVar);
        IR::Opnd * srcOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::ModuleMemReg, TyVar), (int32)Js::AsmJsModuleMemory::MemoryTableBeginOffset, TyVar, m_func);
        IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);
    }
    // ArrayBuffer buffer
    IR::RegOpnd * dstOpnd = BuildDstOpnd(AsmJsRegSlots::BufferReg, TyVar);
    IR::Opnd * srcOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::ArrayReg, TyVar), Js::ArrayBuffer::GetBufferOffset(), TyVar, m_func);
    IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);

    // ArrayBuffer length
    dstOpnd = BuildDstOpnd(AsmJsRegSlots::LengthReg, TyUint32);
    srcOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::ArrayReg, TyVar), Js::ArrayBuffer::GetByteLengthOffset(), TyUint32, m_func);
    instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

template<typename T, typename ConstOpnd, typename F>
void IRBuilderAsmJs::CreateLoadConstInstrForType(
    byte* table,
    Js::RegSlot& regAllocated,
    uint32 constCount,
    uint32 byteOffset,
    IRType irType,
    ValueType valueType,
    Js::OpCode opcode,
    F extraProcess
)
{
    T* typedTable = (T*)(table + byteOffset);
    // 1 for return register
    ++regAllocated;
    ++typedTable;

    for (uint32 i = 1; i < constCount; ++i)
    {
        uint32 reg = regAllocated++;
        T constVal = *typedTable++;
        IR::RegOpnd * dstOpnd = BuildDstOpnd(reg, irType);
        Assert(RegIsConstant(reg));
        dstOpnd->m_sym->SetIsFromByteCodeConstantTable();
        dstOpnd->SetValueType(valueType);

        IR::Instr *instr = IR::Instr::New(opcode, dstOpnd, ConstOpnd::New(constVal, irType, m_func), m_func);

        extraProcess(instr, constVal);
        AddInstr(instr, Js::Constants::NoByteCodeOffset);
    }
}

void
IRBuilderAsmJs::BuildConstantLoads()
{
    Js::Var * constTable = (Js::Var *)m_func->GetJITFunctionBody()->GetConstTable();

    // Load FrameDisplay
    IR::RegOpnd * asmJsEnvDstOpnd = BuildDstOpnd(AsmJsRegSlots::ModuleMemReg, TyVar);
    IR::Instr * ldAsmJsEnvInstr = IR::Instr::New(Js::OpCode::LdAsmJsEnv, asmJsEnvDstOpnd, m_func);
    AddInstr(ldAsmJsEnvInstr, Js::Constants::NoByteCodeOffset);

    // Load heap buffer
    if (m_asmFuncInfo->UsesHeapBuffer())
    {
        BuildHeapBufferReload(Js::Constants::NoByteCodeOffset);
    }
    if (!constTable)
    {
        return;
    }

    uint32 regAllocated = AsmJsRegSlots::RegCount;
    byte* table = (byte*)constTable;
    const bool isOOPJIT = m_func->IsOOPJIT();
    for (int i = 0; i < WAsmJs::LIMIT; ++i)
    {
        WAsmJs::Types type = (WAsmJs::Types)i;
        WAsmJs::TypedSlotInfo info = m_asmFuncInfo->GetTypedSlotInfo(type);
        if (info.constCount == 0)
        {
            continue;
        }

        switch(type)
        {
        case WAsmJs::INT32:
            CreateLoadConstInstrForType<int32, IR::IntConstOpnd>(
                table,
                regAllocated,
                info.constCount,
                info.constSrcByteOffset,
                TyInt32,
                ValueType::GetInt(false),
                Js::OpCode::Ld_I4,
                [isOOPJIT](IR::Instr* instr, int32 val)
                {
                    IR::RegOpnd* dstOpnd = instr->GetDst()->AsRegOpnd();
                    if (!isOOPJIT && dstOpnd->m_sym->IsSingleDef())
                    {
                        dstOpnd->m_sym->SetIsIntConst(val);
                    }
                }
            );
            break;
        case WAsmJs::FLOAT32:
            CreateLoadConstInstrForType<float, IR::FloatConstOpnd>(
                table,
                regAllocated,
                info.constCount,
                info.constSrcByteOffset,
                TyFloat32,
                ValueType::Float,
                Js::OpCode::LdC_F8_R8,
                [isOOPJIT](IR::Instr* instr, float val)
            {
#if _M_IX86
                IR::RegOpnd* dstOpnd = instr->GetDst()->AsRegOpnd();
                if (!isOOPJIT && dstOpnd->m_sym->IsSingleDef())
                {
                    dstOpnd->m_sym->SetIsFloatConst();
                }
#endif
            }
            );
            break;
        case WAsmJs::FLOAT64:
            CreateLoadConstInstrForType<double, IR::FloatConstOpnd>(
                table,
                regAllocated,
                info.constCount,
                info.constSrcByteOffset,
                TyFloat64,
                ValueType::Float,
                Js::OpCode::LdC_F8_R8,
                [isOOPJIT](IR::Instr* instr, double val)
                {
#if _M_IX86
                    IR::RegOpnd* dstOpnd = instr->GetDst()->AsRegOpnd();
                    if (!isOOPJIT && dstOpnd->m_sym->IsSingleDef())
                    {
                        dstOpnd->m_sym->SetIsFloatConst();
                    }
#endif
                }
            );
            break;
        case WAsmJs::SIMD:
            CreateLoadConstInstrForType<AsmJsSIMDValue, IR::Simd128ConstOpnd>(
                table,
                regAllocated,
                info.constCount,
                info.constSrcByteOffset,
                TySimd128F4,
                ValueType::UninitializedObject,
                Js::OpCode::Simd128_LdC,
                [isOOPJIT](IR::Instr* instr, AsmJsSIMDValue val)
                {
#if _M_IX86
                    IR::RegOpnd* dstOpnd = instr->GetDst()->AsRegOpnd();
                    if (!isOOPJIT && dstOpnd->m_sym->IsSingleDef())
                    {
                        dstOpnd->m_sym->SetIsSimd128Const();
                    }
#endif
                }
            );
            break;
        default:
            Assert(false);
            break;
        }
    }
}

void
IRBuilderAsmJs::BuildImplicitArgIns()
{
    int32 intArgInCount = 0;
    int32 int64ArgInCount = 0;
    int32 floatArgInCount = 0;
    int32 doubleArgInCount = 0;
    int32 simd128ArgInCount = 0;

    // formal params are offset from EBP by the EBP chain, return address, and function object
    int32 offset = 3 * MachPtr;
    for (Js::ArgSlot i = 1; i < m_func->GetJITFunctionBody()->GetInParamsCount(); ++i)
    {
        StackSym * symSrc = nullptr;
        IR::Opnd * srcOpnd = nullptr;
        IR::RegOpnd * dstOpnd = nullptr;
        IR::Instr * instr = nullptr;
        // TODO: double args are not aligned on stack
        Js::AsmJsVarType varType = m_func->GetJITFunctionBody()->GetAsmJsInfo()->GetArgType(i - 1);
        switch (varType.which())
        {
        case Js::AsmJsVarType::Which::Int:
            symSrc = StackSym::NewParamSlotSym(i, m_func, TyInt32);
            m_func->SetArgOffset(symSrc, offset);
            srcOpnd = IR::SymOpnd::New(symSrc, TyInt32, m_func);
            dstOpnd = BuildDstOpnd(GetFirstVar(WAsmJs::INT32) + intArgInCount, TyInt32);
            dstOpnd->SetValueType(ValueType::GetInt(false));
            instr = IR::Instr::New(Js::OpCode::ArgIn_A, dstOpnd, srcOpnd, m_func);
            offset += MachPtr;
            ++intArgInCount;
            break;
        case Js::AsmJsVarType::Which::Float:
            symSrc = StackSym::NewParamSlotSym(i, m_func, TyFloat32);
            m_func->SetArgOffset(symSrc, offset);
            srcOpnd = IR::SymOpnd::New(symSrc, TyFloat32, m_func);
            dstOpnd = BuildDstOpnd(GetFirstVar(WAsmJs::FLOAT32) + floatArgInCount, TyFloat32);
            dstOpnd->SetValueType(ValueType::Float);
            instr = IR::Instr::New(Js::OpCode::ArgIn_A, dstOpnd, srcOpnd, m_func);
            offset += MachPtr;
            ++floatArgInCount;
            break;
        case Js::AsmJsVarType::Which::Double:
            symSrc = StackSym::NewParamSlotSym(i, m_func, TyFloat64);
            m_func->SetArgOffset(symSrc, offset);
            srcOpnd = IR::SymOpnd::New(symSrc, TyFloat64, m_func);
            dstOpnd = BuildDstOpnd(GetFirstVar(WAsmJs::FLOAT64) + doubleArgInCount, TyFloat64);
            dstOpnd->SetValueType(ValueType::Float);
            instr = IR::Instr::New(Js::OpCode::ArgIn_A, dstOpnd, srcOpnd, m_func);
            offset += MachDouble;
            ++doubleArgInCount;
            break;
        case Js::AsmJsVarType::Which::Int64:
            symSrc = StackSym::NewParamSlotSym(i, m_func, TyInt64);
            m_func->SetArgOffset(symSrc, offset);
            srcOpnd = IR::SymOpnd::New(symSrc, TyInt64, m_func);
            dstOpnd = BuildDstOpnd(GetFirstVar(WAsmJs::INT64) + int64ArgInCount, TyInt64);
            dstOpnd->SetValueType(ValueType::GetInt(false));
            instr = IR::Instr::New(Js::OpCode::ArgIn_A, dstOpnd, srcOpnd, m_func);
            offset += 8;
            ++int64ArgInCount;
            break;
        default:
        {
            // SIMD_JS
            IRType argType;
            GetSimdTypesFromAsmType((Js::AsmJsType::Which)varType.which(), &argType);

            symSrc = StackSym::NewParamSlotSym(i, m_func, argType);
            m_func->SetArgOffset(symSrc, offset);
            srcOpnd = IR::SymOpnd::New(symSrc, argType, m_func);
            dstOpnd = BuildDstOpnd(GetFirstVar(WAsmJs::SIMD) + simd128ArgInCount, argType);
            dstOpnd->SetValueType(ValueType::UninitializedObject);
            instr = IR::Instr::New(Js::OpCode::ArgIn_A, dstOpnd, srcOpnd, m_func);
            offset += sizeof(AsmJsSIMDValue);
            ++simd128ArgInCount;
            break;
        }

        }

        AddInstr(instr, Js::Constants::NoByteCodeOffset);
    }
}

void
IRBuilderAsmJs::InsertLabels()
{
    AssertMsg(m_branchRelocList, "Malformed branch reloc list");

    SList<BranchReloc *>::Iterator iter(m_branchRelocList);

    while (iter.Next())
    {
        IR::LabelInstr * labelInstr;
        BranchReloc * reloc = iter.Data();
        IR::BranchInstr * branchInstr = reloc->GetBranchInstr();
        uint offset = reloc->GetOffset();
        uint const branchOffset = reloc->GetBranchOffset();

        Assert(!IsLoopBody() || offset <= GetLoopBodyExitInstrOffset());

        if (branchInstr->m_opcode == Js::OpCode::MultiBr)
        {
            IR::MultiBranchInstr * multiBranchInstr = branchInstr->AsBranchInstr()->AsMultiBrInstr();

            multiBranchInstr->UpdateMultiBrTargetOffsets([&](uint32 offset) -> IR::LabelInstr *
            {
                labelInstr = this->CreateLabel(branchInstr, offset);
                multiBranchInstr->ChangeLabelRef(nullptr, labelInstr);
                return labelInstr;
            });
        }
        else
        {
            labelInstr = CreateLabel(branchInstr, offset);
            branchInstr->SetTarget(labelInstr);
        }

        if (!reloc->IsNotBackEdge() && branchOffset >= offset)
        {
            labelInstr->m_isLoopTop = true;
        }
    }
}

IR::LabelInstr *
IRBuilderAsmJs::CreateLabel(IR::BranchInstr * branchInstr, uint & offset)
{
    IR::Instr * targetInstr = nullptr;
    while (targetInstr == nullptr)
    {
        targetInstr = m_offsetToInstruction[offset];
        Assert(offset < m_offsetToInstructionCount);
        ++offset;
    }

    IR::Instr *instrPrev = targetInstr->m_prev;

    if (instrPrev)
    {
        instrPrev = targetInstr->GetPrevRealInstrOrLabel();
    }

    IR::LabelInstr * labelInstr;
    if (instrPrev && instrPrev->IsLabelInstr())
    {
        // Found an existing label at the right offset. Just reuse it.
        labelInstr = instrPrev->AsLabelInstr();
    }
    else
    {
        // No label at the desired offset. Create one.
        labelInstr = IR::LabelInstr::New(Js::OpCode::Label, m_func);
        labelInstr->SetByteCodeOffset(offset);
        if (instrPrev)
        {
            instrPrev->InsertAfter(labelInstr);
        }
        else
        {
            targetInstr->InsertBefore(labelInstr);
        }
    }
    return labelInstr;
}

void
IRBuilderAsmJs::BuildEmpty(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    m_jnReader.Empty();

    IR::Instr * instr = nullptr;
    IR::RegOpnd * regOpnd = nullptr;
    Js::RegSlot retSlot;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Unreachable_Void:
        instr = IR::Instr::New(Js::OpCode::ThrowRuntimeError, m_func);
        instr->SetSrc1(IR::IntConstOpnd::New(SCODE_CODE(WASMERR_Unreachable), TyInt32, instr->m_func));
        AddInstr(instr, offset);
        break;
    case Js::OpCodeAsmJs::Ret:
        instr = IR::Instr::New(Js::OpCode::Ret, m_func);

        switch (m_asmFuncInfo->GetRetType())
        {
        case Js::AsmJsRetType::Which::Signed:
            retSlot = GetRegSlotFromIntReg(0);
            regOpnd = BuildDstOpnd(retSlot, TyInt32);
            regOpnd->SetValueType(ValueType::GetInt(false));
            break;

        case Js::AsmJsRetType::Which::Float:
            retSlot = GetRegSlotFromFloatReg(0);
            regOpnd = BuildDstOpnd(retSlot, TyFloat32);
            regOpnd->SetValueType(ValueType::Float);
            break;

        case Js::AsmJsRetType::Which::Double:
            retSlot = GetRegSlotFromDoubleReg(0);
            regOpnd = BuildDstOpnd(retSlot, TyFloat64);
            regOpnd->SetValueType(ValueType::Float);
            break;

        case Js::AsmJsVarType::Which::Int64:
            retSlot = GetRegSlotFromInt64Reg(0);
            regOpnd = BuildDstOpnd(retSlot, TyInt64);
            regOpnd->SetValueType(ValueType::GetInt(false));
            break;

        case Js::AsmJsRetType::Which::Void:
            retSlot = GetRegSlotFromVarReg(0);
            regOpnd = BuildDstOpnd(retSlot, TyVar);
            break;

        default:
        {
            IRType irType;
            ValueType vType;
            GetSimdTypesFromAsmType(Js::AsmJsRetType(m_asmFuncInfo->GetRetType()).toType().GetWhich(), &irType, &vType);
            retSlot = GetRegSlotFromSimd128Reg(0);
            regOpnd = BuildDstOpnd(retSlot, irType);
            regOpnd->SetValueType(vType);
        }

        }
        instr->SetSrc1(regOpnd);
        AddInstr(instr, offset);
        break;

    case Js::OpCodeAsmJs::Label:
        // NOP
        break;

    default:
        Assume(UNREACHED);
    }
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildElementSlot(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_ElementSlot<SizePolicy>>();
    //TraceIrBuilder(newOpcode, ElementSlot, layout);
    BuildElementSlot(newOpcode, offset, layout->SlotIndex, layout->Value, layout->Instance);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildAsmUnsigned1(Js::OpCodeAsmJs newOpcode, uint value)
{
   // we do not support counter in loop body ,just read the layout here
   m_jnReader.GetLayout<Js::OpLayoutT_AsmUnsigned1<SizePolicy>>();
}
void
IRBuilderAsmJs::BuildElementSlot(Js::OpCodeAsmJs newOpcode, uint32 offset, int32 slotIndex, Js::RegSlot value, Js::RegSlot instance)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));

    Assert(instance == 1 || newOpcode == Js::OpCodeAsmJs::LdArr_Func || newOpcode == Js::OpCodeAsmJs::LdArr_WasmFunc);

    Js::RegSlot valueRegSlot;
    IR::Opnd * slotOpnd;
    IR::RegOpnd * regOpnd;
    IR::Instr * instr = nullptr;

    WAsmJs::Types type;
    IRType irType;
    ValueType valueType;
    bool isStore = false;

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::LdSlot:
        valueRegSlot = GetRegSlotFromVarReg(value);

        slotOpnd = BuildFieldOpnd(AsmJsRegSlots::ModuleMemReg, slotIndex, PropertyKindSlotArray, TyVar);

        regOpnd = BuildDstOpnd(valueRegSlot, TyVar);
        instr = IR::Instr::New(Js::OpCode::LdSlot, regOpnd, slotOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::LdSlotArr:
        valueRegSlot = GetRegSlotFromVarReg(value);

        slotOpnd = BuildFieldOpnd(AsmJsRegSlots::ModuleMemReg, slotIndex, PropertyKindSlots, TyVar);

        regOpnd = BuildDstOpnd(valueRegSlot, TyVar);
        instr = IR::Instr::New(Js::OpCode::LdSlot, regOpnd, slotOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::LdArr_Func:
    {
        IR::RegOpnd * baseOpnd = BuildSrcOpnd(GetRegSlotFromVarReg(instance), TyVar);
        IR::RegOpnd * indexOpnd = BuildSrcOpnd(GetRegSlotFromIntReg(slotIndex), TyUint32);

        IR::IndirOpnd * indirOpnd = IR::IndirOpnd::New(baseOpnd, indexOpnd, TyVar, m_func);

        regOpnd = BuildDstOpnd(GetRegSlotFromVarReg(value), TyVar);
        instr = IR::Instr::New(Js::OpCode::LdAsmJsFunc, regOpnd, indirOpnd, m_func);
        break;
    }
    case Js::OpCodeAsmJs::LdArr_WasmFunc:
    {
        IR::RegOpnd * baseOpnd = BuildSrcOpnd(GetRegSlotFromVarReg(instance), TyVar);
        IR::RegOpnd * indexOpnd = BuildSrcOpnd(GetRegSlotFromIntReg(slotIndex), TyUint32);

        regOpnd = BuildDstOpnd(GetRegSlotFromVarReg(value), TyVar);
        instr = IR::Instr::New(Js::OpCode::LdWasmFunc, regOpnd, baseOpnd, indexOpnd, m_func);
        break;
    }
    case Js::OpCodeAsmJs::StSlot_Int:
    case Js::OpCodeAsmJs::LdSlot_Int:
        type = WAsmJs::INT32;
        irType = TyInt32;
        valueType = ValueType::GetInt(false);
        isStore = newOpcode == Js::OpCodeAsmJs::StSlot_Int;
        goto ProcessGenericSlot;

    case Js::OpCodeAsmJs::StSlot_Long:
    case Js::OpCodeAsmJs::LdSlot_Long:
        type = WAsmJs::INT64;
        irType = TyInt64;
        valueType = ValueType::GetInt(false);
        isStore = newOpcode == Js::OpCodeAsmJs::StSlot_Long;
        goto ProcessGenericSlot;

    case Js::OpCodeAsmJs::StSlot_Flt:
    case Js::OpCodeAsmJs::LdSlot_Flt:
        type = WAsmJs::FLOAT32;
        irType = TyFloat32;
        valueType = ValueType::Float;
        isStore = newOpcode == Js::OpCodeAsmJs::StSlot_Flt;
        goto ProcessGenericSlot;

    case Js::OpCodeAsmJs::StSlot_Db:
    case Js::OpCodeAsmJs::LdSlot_Db:
        type = WAsmJs::FLOAT64;
        irType = TyFloat64;
        valueType = ValueType::Float;
        isStore = newOpcode == Js::OpCodeAsmJs::StSlot_Db;
        goto ProcessGenericSlot;

    case Js::OpCodeAsmJs::Simd128_StSlot_I4:
    case Js::OpCodeAsmJs::Simd128_LdSlot_I4:
        irType = TySimd128I4;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_I4;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_B4:
    case Js::OpCodeAsmJs::Simd128_LdSlot_B4:
        irType = TySimd128B4;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_B4;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_B8:
    case Js::OpCodeAsmJs::Simd128_LdSlot_B8:
        irType = TySimd128B8;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_B8;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_B16:
    case Js::OpCodeAsmJs::Simd128_LdSlot_B16:
        irType = TySimd128B16;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_B16;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_F4:
    case Js::OpCodeAsmJs::Simd128_LdSlot_F4:
        irType = TySimd128F4;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_F4;
        goto ProcessSimdSlot;
#if 0
    case Js::OpCodeAsmJs::Simd128_StSlot_D2:
    case Js::OpCodeAsmJs::Simd128_LdSlot_D2:
        irType = TySimd128D2;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_D2;
        goto ProcessSimdSlot;
#endif // 0
    case Js::OpCodeAsmJs::Simd128_StSlot_I8:
    case Js::OpCodeAsmJs::Simd128_LdSlot_I8:
        irType = TySimd128I8;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_I8;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_I16:
    case Js::OpCodeAsmJs::Simd128_LdSlot_I16:
        irType = TySimd128I16;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_I16;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_U4:
    case Js::OpCodeAsmJs::Simd128_LdSlot_U4:
        irType = TySimd128U4;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_U4;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_U8:
    case Js::OpCodeAsmJs::Simd128_LdSlot_U8:
        irType = TySimd128U8;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_U8;
        goto ProcessSimdSlot;
    case Js::OpCodeAsmJs::Simd128_StSlot_U16:
    case Js::OpCodeAsmJs::Simd128_LdSlot_U16:
        irType = TySimd128U16;
        isStore = newOpcode == Js::OpCodeAsmJs::Simd128_StSlot_U16;
        goto ProcessSimdSlot;

    default:
        Assume(UNREACHED);
        break;
ProcessSimdSlot:
        type = WAsmJs::SIMD;
        valueType = GetSimdValueTypeFromIRType(irType);
ProcessGenericSlot:
        valueRegSlot = GetRegSlotFromTypedReg(value, type);
        slotOpnd = BuildFieldOpnd(AsmJsRegSlots::ModuleMemReg, slotIndex, PropertyKindSlots, irType);
        if (isStore)
        {
            regOpnd = BuildSrcOpnd(valueRegSlot, irType);
            regOpnd->SetValueType(valueType);
            instr = IR::Instr::New(Js::OpCode::StSlot, slotOpnd, regOpnd, m_func);
        }
        else
        {
            regOpnd = BuildDstOpnd(valueRegSlot, irType);
            regOpnd->SetValueType(valueType);
            instr = IR::Instr::New(Js::OpCode::LdSlot, regOpnd, slotOpnd, m_func);
        }
        break;
    }

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildStartCall(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(!OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));

    const unaligned Js::OpLayoutStartCall * layout = m_jnReader.StartCall();
    IR::RegOpnd * dstOpnd = IR::RegOpnd::New(TyVar, m_func);
    IR::IntConstOpnd * srcOpnd = IR::IntConstOpnd::New(layout->ArgCount, TyInt32, m_func);

    IR::Instr * instr = nullptr;
    StackSym * symDst = nullptr;
    IR::SymOpnd * argDst = nullptr;
    IR::AddrOpnd * addrOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::I_StartCall:
        instr = IR::Instr::New(Js::OpCode::StartCall, dstOpnd, srcOpnd, m_func);

        AddInstr(instr, offset);

        // save this so we can calculate arg offsets later on
        m_argOffsetStack->Push(layout->ArgCount);
        m_argStack->Push(instr);
        break;

    case Js::OpCodeAsmJs::StartCall:
        instr = IR::Instr::New(Js::OpCode::StartCall, dstOpnd, srcOpnd, m_func);

        AddInstr(instr, offset);

        m_argStack->Push(instr);

        // also need to add undefined as arg0
        addrOpnd = IR::AddrOpnd::New(m_func->GetScriptContextInfo()->GetUndefinedAddr(), IR::AddrOpndKindDynamicVar, m_func, true);
        addrOpnd->SetValueType(ValueType::Undefined);

        symDst = m_func->m_symTable->GetArgSlotSym(1);

        argDst = IR::SymOpnd::New(symDst, TyVar, m_func);

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, argDst, addrOpnd, m_func);

        AddInstr(instr, offset);
        m_argStack->Push(instr);

        break;
    default:
        Assume(UNREACHED);
    }
}

void
IRBuilderAsmJs::InitializeMemAccessTypeInfo(Js::ArrayBufferView::ViewType viewType, _Out_ MemAccessTypeInfo * typeInfo)
{
    typeInfo->type = TyInt32;
    typeInfo->valueRegType = WAsmJs::INT32;

    switch (viewType)
    {
    case Js::ArrayBufferView::TYPE_INT8_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_INT8:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Int8Array);
        typeInfo->type = TyInt8;
        break;
    case Js::ArrayBufferView::TYPE_UINT8_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_UINT8:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Uint8Array);
        typeInfo->type = TyUint8;
        break;
    case Js::ArrayBufferView::TYPE_INT16_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_INT16:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Int16Array);
        typeInfo->type = TyInt16;
        break;
    case Js::ArrayBufferView::TYPE_UINT16_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_UINT16:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Uint16Array);
        typeInfo->type = TyUint16;
        break;
    case Js::ArrayBufferView::TYPE_INT32_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_INT32:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Int32Array);
        typeInfo->type = TyInt32;
        break;
    case Js::ArrayBufferView::TYPE_UINT32_TO_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
    case Js::ArrayBufferView::TYPE_UINT32:
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Uint32Array);
        typeInfo->type = TyUint32;
        break;
    case Js::ArrayBufferView::TYPE_FLOAT32:
        typeInfo->valueRegType = WAsmJs::FLOAT32;
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Float32Array);
        typeInfo->type = TyFloat32;
        break;
    case Js::ArrayBufferView::TYPE_FLOAT64:
        typeInfo->valueRegType = WAsmJs::FLOAT64;
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Float64Array);
        typeInfo->type = TyFloat64;
        break;
    case Js::ArrayBufferView::TYPE_INT64:
        typeInfo->valueRegType = WAsmJs::INT64;
        typeInfo->arrayType = ValueType::GetObject(ObjectType::Int64Array);
        typeInfo->type = TyInt64;
        break;
    default:
        Assume(UNREACHED);
    }
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildWasmMemAccess(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_WasmMemAccess<SizePolicy>>();
    BuildWasmMemAccess(newOpcode, offset, layout->SlotIndex, layout->Value, layout->Offset, layout->ViewType);
}

void
IRBuilderAsmJs::BuildWasmMemAccess(Js::OpCodeAsmJs newOpcode, uint32 offset, uint32 slotIndex, Js::RegSlot value, uint32 constOffset, Js::ArrayBufferView::ViewType viewType)
{
    bool isLd = newOpcode == Js::OpCodeAsmJs::LdArrWasm;
    Js::OpCode op = isLd ? Js::OpCode::LdArrViewElemWasm : Js::OpCode::StArrViewElem;

    MemAccessTypeInfo typeInfo;
    InitializeMemAccessTypeInfo(viewType, &typeInfo);

    Js::RegSlot valueRegSlot = GetRegSlotFromTypedReg(value, typeInfo.valueRegType);
    IR::Instr * instr = nullptr;
    IR::RegOpnd * regOpnd = nullptr;
    IR::IndirOpnd * indirOpnd = nullptr;

    Js::RegSlot indexRegSlot = GetRegSlotFromIntReg(slotIndex);
    IR::RegOpnd * indexOpnd = BuildSrcOpnd(indexRegSlot, TyUint32);
    indirOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::BufferReg, TyVar), constOffset, typeInfo.type, m_func);
    indirOpnd->SetIndexOpnd(indexOpnd);
    indirOpnd->GetBaseOpnd()->SetValueType(typeInfo.arrayType);

    // Setup the value/destination
    if (typeInfo.valueRegType == WAsmJs::FLOAT32 || typeInfo.valueRegType == WAsmJs::FLOAT64)
    {
        Assert(IRType_IsFloat(typeInfo.type));
        regOpnd = !isLd ? BuildSrcOpnd(valueRegSlot, typeInfo.type) : BuildDstOpnd(valueRegSlot, typeInfo.type);
        regOpnd->SetValueType(ValueType::Float);
    }
    else if (typeInfo.valueRegType == WAsmJs::INT64)
    {
        Assert(IRType_IsNativeInt(typeInfo.type));
        regOpnd = !isLd ? BuildSrcOpnd(valueRegSlot, TyInt64) : BuildDstOpnd(valueRegSlot, TyInt64);
        regOpnd->SetValueType(ValueType::GetInt(false));
    }
    else
    {
        Assert(IRType_IsNativeInt(typeInfo.type));
        Assert(typeInfo.valueRegType == WAsmJs::INT32);
        regOpnd = !isLd ? BuildSrcOpnd(valueRegSlot, TyInt32) : BuildDstOpnd(valueRegSlot, TyInt32);
        regOpnd->SetValueType(ValueType::GetInt(false));
    }

    // Create the instruction
    if (isLd)
    {
        instr = IR::Instr::New(op, regOpnd, indirOpnd, m_func);
    }
    else
    {
        instr = IR::Instr::New(op, indirOpnd, regOpnd, m_func);
    }

#if ENABLE_FAST_ARRAYBUFFER
    if (!CONFIG_FLAG(WasmFastArray))
#endif
    {
        instr->SetSrc2(BuildSrcOpnd(AsmJsRegSlots::LengthReg, TyUint32));
    }
    AddInstr(instr, offset);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildAsmTypedArr(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_AsmTypedArr<SizePolicy>>();
    BuildAsmTypedArr(newOpcode, offset, layout->SlotIndex, layout->Value, layout->ViewType);
}

void
IRBuilderAsmJs::BuildAsmTypedArr(Js::OpCodeAsmJs newOpcode, uint32 offset, uint32 slotIndex, Js::RegSlot value, Js::ArrayBufferView::ViewType viewType)
{
    bool isLd = newOpcode == Js::OpCodeAsmJs::LdArr || newOpcode == Js::OpCodeAsmJs::LdArrConst;
    Js::OpCode op = isLd ? Js::OpCode::LdArrViewElem : Js::OpCode::StArrViewElem;

    MemAccessTypeInfo typeInfo;
    InitializeMemAccessTypeInfo(viewType, &typeInfo);

    Js::RegSlot valueRegSlot = GetRegSlotFromTypedReg(value, typeInfo.valueRegType);
    IR::Instr * instr = nullptr;
    IR::Instr * maskInstr = nullptr;
    IR::RegOpnd * regOpnd = nullptr;
    IR::IndirOpnd * indirOpnd = nullptr;

    // Get the index
    if (newOpcode == Js::OpCodeAsmJs::LdArr || newOpcode == Js::OpCodeAsmJs::StArr)
    {
        uint32 mask = Js::ArrayBufferView::ViewMask[viewType];
        Js::RegSlot indexRegSlot = GetRegSlotFromIntReg(slotIndex);
        IR::RegOpnd * maskedOpnd = nullptr;
        if (mask != ~0)
        {
            maskedOpnd = IR::RegOpnd::New(TyUint32, m_func);
            maskInstr = IR::Instr::New(Js::OpCode::And_I4, maskedOpnd, BuildSrcOpnd(indexRegSlot, TyInt32), IR::IntConstOpnd::New(mask, TyUint32, m_func), m_func);
            AddInstr(maskInstr, offset);
        }
        else
        {
            maskedOpnd = BuildSrcOpnd(indexRegSlot, TyInt32);
        }
        indirOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::BufferReg, TyVar), maskedOpnd, typeInfo.type, m_func);
        indirOpnd->GetBaseOpnd()->SetValueType(typeInfo.arrayType);
    }
    else
    {
        Assert(newOpcode == Js::OpCodeAsmJs::LdArrConst || newOpcode == Js::OpCodeAsmJs::StArrConst);
        indirOpnd = IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::BufferReg, TyVar), slotIndex, typeInfo.type, m_func);
        indirOpnd->GetBaseOpnd()->SetValueType(typeInfo.arrayType);
    }

    // Setup the value/destination
    if (typeInfo.valueRegType == WAsmJs::FLOAT32 || typeInfo.valueRegType == WAsmJs::FLOAT64)
    {
        Assert(IRType_IsFloat(typeInfo.type));
        regOpnd = !isLd ? BuildSrcOpnd(valueRegSlot, typeInfo.type) : BuildDstOpnd(valueRegSlot, typeInfo.type);
        regOpnd->SetValueType(ValueType::Float);
    }
    else
    {
        Assert(IRType_IsNativeInt(typeInfo.type));
        Assert(typeInfo.valueRegType == WAsmJs::INT32);
        regOpnd = !isLd ? BuildSrcOpnd(valueRegSlot, TyInt32) : BuildDstOpnd(valueRegSlot, TyInt32);
        regOpnd->SetValueType(ValueType::GetInt(false));
    }

    // Create the instruction
    if (isLd)
    {
        instr = IR::Instr::New(op, regOpnd, indirOpnd, m_func);
    }
    else
    {
        instr = IR::Instr::New(op, indirOpnd, regOpnd, m_func);
    }

#if !ENABLE_FAST_ARRAYBUFFER
    instr->SetSrc2(BuildSrcOpnd(AsmJsRegSlots::LengthReg, TyUint32));
#endif
    AddInstr(instr, offset);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildAsmCall(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_AsmCall<SizePolicy>>();
    BuildAsmCall(newOpcode, offset, layout->ArgCount, layout->Return, layout->Function, layout->ReturnType);
}

void
IRBuilderAsmJs::BuildAsmCall(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::ArgSlot argCount, Js::RegSlot ret, Js::RegSlot function, int8 returnType)
{
#if DBG
    int count = 0;
#endif

    IR::Instr * instr = nullptr;
    IR::RegOpnd * dstOpnd = nullptr;
    IR::Opnd * srcOpnd = nullptr;
    Js::RegSlot dstRegSlot;
    Js::RegSlot srcRegSlot;
    int32 argOffset = 0;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::I_Call:
        srcRegSlot = GetRegSlotFromVarReg(function);
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyVar);

        switch ((Js::AsmJsRetType::Which)returnType)
        {
        case Js::AsmJsRetType::Which::Signed:
            dstRegSlot = GetRegSlotFromIntReg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
            dstOpnd->SetValueType(ValueType::GetInt(false));
            break;

        case Js::AsmJsRetType::Which::Float:
            dstRegSlot = GetRegSlotFromFloatReg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
            dstOpnd->SetValueType(ValueType::Float);
            break;

        case Js::AsmJsRetType::Which::Double:
            dstRegSlot = GetRegSlotFromDoubleReg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
            dstOpnd->SetValueType(ValueType::Float);
            break;

        case Js::AsmJsRetType::Which::Int64:
            dstRegSlot = GetRegSlotFromInt64Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
            dstOpnd->SetValueType(ValueType::GetInt(false));
            break;

        case Js::AsmJsRetType::Which::Void:
            break;

        case Js::AsmJsRetType::Which::Float32x4:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
            break;
        case Js::AsmJsRetType::Which::Int32x4:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I4);
            break;
        case Js::AsmJsRetType::Which::Bool32x4:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128B4);
            break;
        case Js::AsmJsRetType::Which::Bool16x8:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128B8);
            break;
        case Js::AsmJsRetType::Which::Bool8x16:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128B16);
            break;
        case Js::AsmJsRetType::Which::Float64x2:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
            break;
        case Js::AsmJsRetType::Which::Int16x8:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I8);
            break;
        case Js::AsmJsRetType::Which::Int8x16:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I16);
            break;
        case Js::AsmJsRetType::Which::Uint32x4:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U4);
            break;
        case Js::AsmJsRetType::Which::Uint16x8:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U8);
            break;
        case Js::AsmJsRetType::Which::Uint8x16:
            dstRegSlot = GetRegSlotFromSimd128Reg(ret);
            dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U16);
            break;
            default:
            Assume(UNREACHED);
        }

        instr = IR::Instr::New(Js::OpCode::AsmJsCallI, m_func);
        instr->SetSrc1(srcOpnd);
        if (dstOpnd)
        {
            instr->SetDst(dstOpnd);
        }

        argOffset = m_argOffsetStack->Pop();
        argOffset -= MachPtr;
        break;

    case Js::OpCodeAsmJs::Call:
        srcRegSlot = GetRegSlotFromVarReg(function);
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyVar);

        dstRegSlot = GetRegSlotFromVarReg(ret);
        dstOpnd = BuildDstOpnd(dstRegSlot, TyVar);

        instr = IR::Instr::New(Js::OpCode::AsmJsCallE, dstOpnd, srcOpnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);

    IR::Instr * argInstr = nullptr;
    IR::Instr * prevInstr = instr;

    for (argInstr = m_argStack->Pop(); argInstr && argInstr->m_opcode != Js::OpCode::StartCall; argInstr = m_argStack->Pop())
    {
        if (newOpcode == Js::OpCodeAsmJs::I_Call)
        {
#if _M_IX86
            argOffset -= argInstr->GetDst()->GetSize();
#elif _M_X64
            argOffset -= (argInstr->GetDst()->GetSize() <= MachPtr ? MachPtr : argInstr->GetDst()->GetSize());
#else
            Assert(UNREACHED);
#endif
            argInstr->GetDst()->GetStackSym()->m_offset = argOffset;

        }
        // associate the ArgOuts with this call via src2
        prevInstr->SetSrc2(argInstr->GetDst());
        prevInstr = argInstr;

#if defined(_M_X64)
        if (m_func->IsSIMDEnabled())
        {
            m_tempList->Push(argInstr);
        }
#endif

#if DBG
        count++;
#endif
    }
    Assert(argOffset == 0);
    AnalysisAssert(argInstr);
    prevInstr->SetSrc2(argInstr->GetDst());

#if defined(_M_X64)
    // Without SIMD vars, all args are Var in size. So offset in Var = arg position in args list.
    // With SIMD, args have variable size, so we need to track argument position in the args list to be able to assign arg register for first four args on x64.
    if (m_func->IsSIMDEnabled())
    {
        for (uint i = 1; !m_tempList->Empty(); i++)
        {
            IR::Instr * instrArg = m_tempList->Pop();
            // record argument position and make room for implicit args
            instrArg->GetDst()->GetStackSym()->m_argPosition = i;
            if (newOpcode == Js::OpCodeAsmJs::I_Call)
            {
                // implicit func obj arg
                instrArg->GetDst()->GetStackSym()->m_argPosition += 1;
            }
            else
            {
                // implicit func obj + callInfo args
                Assert(newOpcode == Js::OpCodeAsmJs::Call);
                instrArg->GetDst()->GetStackSym()->m_argPosition += 2;
            }
        }
    }
#endif

    if (m_func->m_argSlotsForFunctionsCalled < argCount)
    {
        m_func->m_argSlotsForFunctionsCalled = argCount;
    }
    if (m_asmFuncInfo->UsesHeapBuffer())
    {
        // heap buffer can change for wasm
#ifdef ENABLE_WASM
        if (m_func->GetJITFunctionBody()->IsWasmFunction())
        {
            BuildHeapBufferReload(offset);
        }
#endif
        // after foreign function call, we need to make sure that the heap hasn't been detached
        if (newOpcode == Js::OpCodeAsmJs::Call)
        {
            IR::Instr * instrArrayDetachedCheck = IR::Instr::New(Js::OpCode::ArrayDetachedCheck, m_func);
            instrArrayDetachedCheck->SetSrc1(IR::IndirOpnd::New(BuildSrcOpnd(AsmJsRegSlots::ArrayReg, TyVar), Js::ArrayBuffer::GetIsDetachedOffset(), TyInt8, m_func));
            AddInstr(instrArrayDetachedCheck, offset);
        }
    }
}

void
IRBuilderAsmJs::BuildAsmBr(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(!OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));

    const unaligned Js::OpLayoutAsmBr * branchInsn = m_jnReader.AsmBr();
    uint targetOffset = m_jnReader.GetCurrentOffset() + branchInsn->RelativeJumpOffset;

    if (newOpcode == Js::OpCodeAsmJs::EndSwitch_Int)
    {
        m_switchBuilder.EndSwitch(offset, targetOffset);
        return;
    }

    IR::BranchInstr * branchInstr = IR::BranchInstr::New(Js::OpCode::Br, NULL, m_func);
    AddBranchInstr(branchInstr, offset, targetOffset);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildAsmReg1(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_AsmReg1<SizePolicy>>();
    BuildAsmReg1(newOpcode, offset, layout->R0);
}

void
IRBuilderAsmJs::BuildAsmReg1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstReg)
{

    if (newOpcode == Js::OpCodeAsmJs::LdUndef)
    {

        Js::RegSlot dstRegSlot = GetRegSlotFromVarReg(dstReg);
        IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyVar);

        if (dstOpnd->m_sym->m_isSingleDef)
        {
            dstOpnd->m_sym->m_isConst = true;
            dstOpnd->m_sym->m_isNotInt = true;
        }

        IR::AddrOpnd * addrOpnd = IR::AddrOpnd::New(m_func->GetScriptContextInfo()->GetUndefinedAddr(), IR::AddrOpndKindDynamicVar, m_func, true);
        addrOpnd->SetValueType(ValueType::Undefined);

        IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, addrOpnd, m_func);
        AddInstr(instr, offset);
    }
    else
    {
        Assert(newOpcode == Js::OpCodeAsmJs::CurrentMemory_Int);
        Js::RegSlot dstRegSlot = GetRegSlotFromIntReg(dstReg);
        IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
        IR::IntConstOpnd* constZero = IR::IntConstOpnd::New(0, TyInt32, m_func);
        IR::IntConstOpnd* constSixteen = IR::IntConstOpnd::New(16, TyUint8, m_func);

        IR::Instr * instr = m_asmFuncInfo->UsesHeapBuffer() ?
            IR::Instr::New(Js::OpCode::ShrU_I4, dstOpnd, BuildSrcOpnd(AsmJsRegSlots::LengthReg, TyUint32), constSixteen, m_func) :
            IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, constZero, m_func);

        AddInstr(instr, offset);
    }

}

#define BUILD_LAYOUT_IMPL(layout, ...) \
    template <typename SizePolicy> void IRBuilderAsmJs::Build##layout (Js::OpCodeAsmJs newOpcode, uint32 offset) \
    { \
        Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));\
        auto _layout = m_jnReader.GetLayout<Js::OpLayoutT_##layout <SizePolicy>>();\
        Build##layout(newOpcode, offset, __VA_ARGS__);\
    }

#define RegProc(v) v
#define IntProc(v) GetRegSlotFromIntReg(v)
#define LongProc(v) GetRegSlotFromInt64Reg(v)
#define FloatProc(v) GetRegSlotFromFloatReg(v)
#define DoubleProc(v) GetRegSlotFromDoubleReg(v)
#define IntConstProc(v) v
#define LongConstProc(v) v
#define FloatConstProc(v) v
#define DoubleConstProc(v) v
#define Float32x4Proc(v) GetRegSlotFromSimd128Reg(v)
#define Bool32x4Proc(v) GetRegSlotFromSimd128Reg(v)
#define Int32x4Proc(v) GetRegSlotFromSimd128Reg(v)
#define Float64x2Proc(v) GetRegSlotFromSimd128Reg(v)
#define Int16x8Proc(v) GetRegSlotFromSimd128Reg(v)
#define Bool16x8Proc(v) GetRegSlotFromSimd128Reg(v)
#define Int8x16Proc(v) GetRegSlotFromSimd128Reg(v)
#define Bool8x16Proc(v) GetRegSlotFromSimd128Reg(v)
#define Uint32x4Proc(v) GetRegSlotFromSimd128Reg(v)
#define Uint16x8Proc(v) GetRegSlotFromSimd128Reg(v)
#define Uint8x16Proc(v) GetRegSlotFromSimd128Reg(v)
#define _PREFIX_HELPER(prefix, index) prefix##index
#define _PREFIX_NAME(prefix, index) _PREFIX_HELPER(prefix, index)
#define _M(ti, i) ti##Proc(_layout-> _PREFIX_NAME(LAYOUT_PREFIX_##ti(), i))
#define LAYOUT_TYPE_WMS_REG2(layout, t0, t1) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1))
#define LAYOUT_TYPE_WMS_REG3(layout, t0, t1, t2) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2))
#define LAYOUT_TYPE_WMS_REG4(layout, t0, t1, t2, t3) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3))
#define LAYOUT_TYPE_WMS_REG5(layout, t0, t1, t2, t3, t4) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4))
#define LAYOUT_TYPE_WMS_REG6(layout, t0, t1, t2, t3, t4, t5) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5))
#define LAYOUT_TYPE_WMS_REG7(layout, t0, t1, t2, t3, t4, t5, t6) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6))
#define LAYOUT_TYPE_WMS_REG9(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8))
#define LAYOUT_TYPE_WMS_REG10(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8), _M(t9, 9))
#define LAYOUT_TYPE_WMS_REG11(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8), _M(t9, 9), _M(t10, 10))
#define LAYOUT_TYPE_WMS_REG17(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8), _M(t9, 9), _M(t10, 10), _M(t11, 11), _M(t12, 12), _M(t13, 13), _M(t14, 14), _M(t15, 15), _M(t16, 16))
#define LAYOUT_TYPE_WMS_REG18(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16, t17) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8), _M(t9, 9), _M(t10, 10), _M(t11, 11), _M(t12, 12), _M(t13, 13), _M(t14, 14), _M(t15, 15), _M(t16, 16), _M(t17, 17))
#define LAYOUT_TYPE_WMS_REG19(layout, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16, t17, t18) BUILD_LAYOUT_IMPL(layout, _M(t0, 0), _M(t1, 1), _M(t2, 2), _M(t3, 3), _M(t4, 4), _M(t5, 5), _M(t6, 6), _M(t7, 7), _M(t8, 8), _M(t9, 9), _M(t10, 10), _M(t11, 11), _M(t12, 12), _M(t13, 13), _M(t14, 14), _M(t15, 15), _M(t16, 16), _M(t17, 17), _M(t18, 18))
#define EXCLUDE_FRONTEND_LAYOUT
#include "LayoutTypesAsmJs.h"
#undef BUILD_LAYOUT_IMPL
#undef _PREFIX_NAME
#undef _PREFIX_HELPER
#undef _M
#undef RegProc
#undef IntProc
#undef LongProc
#undef FloatProc
#undef DoubleProc
#undef IntConstProc
#undef LongConstProc
#undef FloatConstProc
#undef DoubleConstProc
#undef Float32x4Proc
#undef Bool32x4Proc
#undef Int32x4Proc
#undef Float64x2Proc
#undef Int16x8Proc
#undef Bool16x8Proc
#undef Int8x16Proc
#undef Bool8x16Proc
#undef Uint32x4Proc
#undef Uint16x8Proc
#undef Uint8x16Proc

void IRBuilderAsmJs::BuildArgOut(IR::Opnd* srcOpnd, uint32 dstRegSlot, uint32 offset, IRType type, ValueType valueType)
{
    Js::ArgSlot dstArgSlot = (Js::ArgSlot)dstRegSlot;
    if ((uint32)dstArgSlot != dstRegSlot)
    {
        AssertMsg(UNREACHED, "Arg count too big...");
        Fatal();
    }
    StackSym * symDst = nullptr;
    if (type == TyVar)
    {
        symDst = m_func->m_symTable->GetArgSlotSym(ArgSlotMath::Add(dstArgSlot, 1));
        IR::Opnd * tmpDst = IR::RegOpnd::New(StackSym::New(m_func), TyVar, m_func);

        IR::Instr * instr = IR::Instr::New(Js::OpCode::ToVar, tmpDst, srcOpnd, m_func);
        AddInstr(instr, offset);
        srcOpnd = tmpDst;
    }
    else
    {
        symDst = StackSym::NewArgSlotSym(dstArgSlot, m_func, type);
        symDst->m_allocated = true;
    }

    IR::Opnd * dstOpnd = IR::SymOpnd::New(symDst, type, m_func);
    if (!valueType.IsUninitialized())
    {
        dstOpnd->SetValueType(valueType);
    }

    IR::Instr * instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);

    m_argStack->Push(instr);
}

void IRBuilderAsmJs::BuildFromVar(uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot, IRType irType, ValueType valueType)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(GetRegSlotFromVarReg(srcRegSlot), TyVar);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, irType);
    dstOpnd->SetValueType(valueType);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::FromVar, dstOpnd, srcOpnd, m_func);

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);
    IR::RegOpnd * dstOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_DTI:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
        break;
    case Js::OpCodeAsmJs::Conv_DTU:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyUint32);
        break;
    case Js::OpCodeAsmJs::Conv_Check_DTI:
    case Js::OpCodeAsmJs::Conv_Check_DTU:
    {
        IR::RegOpnd* tmpDst = IR::RegOpnd::New(TyFloat64, m_func);
        tmpDst->SetValueType(ValueType::Float);
        AddInstr(IR::Instr::New(Js::OpCode::TrapIfTruncOverflow, tmpDst, srcOpnd, m_func), offset);
        dstOpnd = BuildDstOpnd(dstRegSlot, newOpcode == Js::OpCodeAsmJs::Conv_Check_DTI ? TyInt32 : TyUint32);
        dstOpnd->m_dontDeadStore = true;
        srcOpnd = tmpDst;
        break;
    }
    default:
        Assume(UNREACHED);
    }
    dstOpnd->SetValueType(ValueType::GetInt(false));
    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat32);
    srcOpnd->SetValueType(ValueType::Float);
    IR::RegOpnd * dstOpnd = nullptr;
    Js::OpCode op = Js::OpCode::Nop;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_FTI:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
        op = Js::OpCode::Conv_Prim;
        break;
    case Js::OpCodeAsmJs::Conv_FTU:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyUint32);
        op = Js::OpCode::Conv_Prim;
        break;
    case Js::OpCodeAsmJs::Reinterpret_FTI:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
        op = Js::OpCode::Reinterpret_Prim;
        break;

    case Js::OpCodeAsmJs::Conv_Check_FTI:
    case Js::OpCodeAsmJs::Conv_Check_FTU:
    {
        IR::RegOpnd* tmpDst = IR::RegOpnd::New(TyFloat32, m_func);
        tmpDst->SetValueType(ValueType::Float);
        AddInstr(IR::Instr::New(Js::OpCode::TrapIfTruncOverflow, tmpDst, srcOpnd, m_func), offset);
        dstOpnd = BuildDstOpnd(dstRegSlot, newOpcode == Js::OpCodeAsmJs::Conv_Check_FTI ? TyInt32 : TyUint32);
        dstOpnd->m_dontDeadStore = true;
        srcOpnd = tmpDst;
        op = Js::OpCode::Conv_Prim;
        break;
    }
    default:
        Assume(UNREACHED);
    }
    dstOpnd->SetValueType(ValueType::GetInt(false));
    IR::Instr * instr = IR::Instr::New(op, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_ITD:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
        break;

    case Js::OpCodeAsmJs::Conv_UTD:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyUint32);
        break;

    default:
        Assume(UNREACHED);
    }
    srcOpnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Conv_FTD);

    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat32);
    srcOpnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat1Reg1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Conv_VTF);
    BuildFromVar(offset, dstRegSlot, srcRegSlot, TyFloat32, ValueType::Float);
}

void
IRBuilderAsmJs::BuildDouble1Reg1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Conv_VTD);
    BuildFromVar(offset, dstRegSlot, srcRegSlot, TyFloat64, ValueType::Float);
}

void
IRBuilderAsmJs::BuildInt1Reg1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Conv_VTI);
    BuildFromVar(offset, dstRegSlot, srcRegSlot, TyInt32, ValueType::GetInt(false));
}

void
IRBuilderAsmJs::BuildReg1Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstReg, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::ArgOut_Db:
        BuildArgOut(srcOpnd, dstReg, offset, TyVar);
        break;
    case Js::OpCodeAsmJs::I_ArgOut_Db:
        BuildArgOut(srcOpnd, dstReg, offset, TyFloat64, ValueType::Float);
        break;
    default:
        Assume(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildReg1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstReg, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat32);
    srcOpnd->SetValueType(ValueType::Float);

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::ArgOut_Flt:
        BuildArgOut(srcOpnd, dstReg, offset, TyVar);
        break;
    case Js::OpCodeAsmJs::I_ArgOut_Flt:
        BuildArgOut(srcOpnd, dstReg, offset, TyFloat32, ValueType::Float);
        break;
    default:
        Assume(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildReg1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstReg, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
    srcOpnd->SetValueType(ValueType::GetInt(false));

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::ArgOut_Int:
        BuildArgOut(srcOpnd, dstReg, offset, TyVar);
        break;
    case Js::OpCodeAsmJs::I_ArgOut_Int:
        BuildArgOut(srcOpnd, dstReg, offset, TyInt32, ValueType::GetInt(false));
        break;
    default:
        Assume(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildInt1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, int constInt)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Ld_IntConst);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, IR::IntConstOpnd::New(constInt, TyInt32, m_func), m_func);

    if (dstOpnd->m_sym->IsSingleDef())
    {
        dstOpnd->m_sym->SetIsIntConst(constInt);
    }

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildReg1IntConst1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot reg1, int constInt)
{
    Assert(newOpcode == Js::OpCodeAsmJs::CheckSignature);

    IR::RegOpnd * funcReg = BuildSrcOpnd(reg1, TyMachPtr);

    IR::IntConstOpnd * sigIndex = IR::IntConstOpnd::New(constInt, TyInt32, m_func);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::CheckWasmSignature, m_func);
    instr->SetSrc1(funcReg);
    instr->SetSrc2(sigIndex);

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, float constVal)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Ld_FltConst);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::LdC_F8_R8, dstOpnd, IR::FloatConstOpnd::New(constVal, TyFloat32, m_func), m_func);

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, double constVal)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Ld_DbConst);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::LdC_F8_R8, dstOpnd, IR::FloatConstOpnd::New(constVal, TyFloat64, m_func), m_func);

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Double2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat64);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat64);
    src2Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::CmLt_Db:
        instr = IR::Instr::New(Js::OpCode::CmLt_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmLe_Db:
        instr = IR::Instr::New(Js::OpCode::CmLe_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmGt_Db:
        instr = IR::Instr::New(Js::OpCode::CmGt_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmGe_Db:
        instr = IR::Instr::New(Js::OpCode::CmGe_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmEq_Db:
        instr = IR::Instr::New(Js::OpCode::CmEq_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmNe_Db:
        instr = IR::Instr::New(Js::OpCode::CmNeq_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Float2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat32);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat32);
    src2Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::CmLt_Flt:
        instr = IR::Instr::New(Js::OpCode::CmLt_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmLe_Flt:
        instr = IR::Instr::New(Js::OpCode::CmLe_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmGt_Flt:
        instr = IR::Instr::New(Js::OpCode::CmGt_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmGe_Flt:
        instr = IR::Instr::New(Js::OpCode::CmGe_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmEq_Flt:
        instr = IR::Instr::New(Js::OpCode::CmEq_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::CmNe_Flt:
        instr = IR::Instr::New(Js::OpCode::CmNeq_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    default:
        Assume(UNREACHED);
    }

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
    srcOpnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::BeginSwitch_Int:
        m_switchBuilder.BeginSwitch();
        // fall-through
    case Js::OpCodeAsmJs::Ld_Int:
        instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Neg_Int:
        instr = IR::Instr::New(Js::OpCode::Neg_I4, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Not_Int:
        instr = IR::Instr::New(Js::OpCode::Not_I4, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::LogNot_Int:
        instr = IR::Instr::New(Js::OpCode::CmEq_I4, dstOpnd, srcOpnd, IR::IntConstOpnd::New(0, TyInt32, m_func), m_func);
        break;

    case Js::OpCodeAsmJs::Conv_ITB:
        instr = IR::Instr::New(Js::OpCode::CmNeq_I4, dstOpnd, srcOpnd, IR::IntConstOpnd::New(0, TyInt32, m_func), m_func);
        break;

    case Js::OpCodeAsmJs::Abs_Int:
        instr = IR::Instr::New(Js::OpCode::InlineMathAbs, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Clz32_Int:
        instr = IR::Instr::New(Js::OpCode::InlineMathClz, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Ctz_Int:
        instr = IR::Instr::New(Js::OpCode::Ctz, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::I_Conv_VTI:
        instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::PopCnt_Int:
        instr = IR::Instr::New(Js::OpCode::PopCnt, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Return_Int:
        instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, srcOpnd, m_func);
        if (m_func->IsLoopBody())
        {
            IR::Instr* slotInstr = GenerateStSlotForReturn(srcOpnd, IRType::TyInt32);
            AddInstr(slotInstr, offset);
        }

        break;

    case Js::OpCodeAsmJs::Eqz_Int:
        instr = IR::Instr::New(Js::OpCode::CmEq_I4, dstOpnd, srcOpnd, IR::IntConstOpnd::New(0, TyInt32, m_func), m_func);
        break;

    case Js::OpCodeAsmJs::GrowMemory:
        instr = IR::Instr::New(Js::OpCode::GrowWasmMemory, dstOpnd, BuildSrcOpnd(AsmJsRegSlots::WasmMemoryReg, TyVar), srcOpnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }

    AddInstr(instr, offset);

    if (newOpcode == Js::OpCodeAsmJs::GrowMemory)
    {
        BuildHeapBufferReload(offset);
    }
}

IR::RegOpnd* IRBuilderAsmJs::BuildTrapIfZero(IR::RegOpnd* srcOpnd, uint32 offset)
{
    IR::RegOpnd* newSrc = IR::RegOpnd::New(srcOpnd->GetType(), m_func);
    newSrc->SetValueType(ValueType::GetInt(false));
    AddInstr(IR::Instr::New(Js::OpCode::TrapIfZero, newSrc, srcOpnd, m_func), offset);
    return newSrc;
}

IR::RegOpnd* IRBuilderAsmJs::BuildTrapIfMinIntOverNegOne(IR::RegOpnd* src1Opnd, IR::RegOpnd* src2Opnd, uint32 offset)
{
    IR::RegOpnd* newSrc = IR::RegOpnd::New(src2Opnd->GetType(), m_func);
    newSrc->SetValueType(ValueType::GetInt(false));
    AddInstr(IR::Instr::New(Js::OpCode::TrapIfMinIntOverNegOne, newSrc, src1Opnd, src2Opnd, m_func), offset);
    return newSrc;
}

void
IRBuilderAsmJs::BuildInt3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt32);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Add_Int:
        instr = IR::Instr::New(Js::OpCode::Add_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Sub_Int:
        instr = IR::Instr::New(Js::OpCode::Sub_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Mul_Int:
        instr = IR::Instr::New(Js::OpCode::Mul_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Div_Trap_UInt:
        src1Opnd->SetType(TyUint32);
        src2Opnd->SetType(TyUint32);
        // Fall through for trap
    case Js::OpCodeAsmJs::Div_Trap_Int:
#ifdef _M_X64
        src2Opnd = BuildTrapIfZero(src2Opnd, offset);
        if (newOpcode == Js::OpCodeAsmJs::Div_Trap_Int)
        {
            src1Opnd = BuildTrapIfMinIntOverNegOne(src1Opnd, src2Opnd, offset);
        }
#endif
        instr = IR::Instr::New(newOpcode == Js::OpCodeAsmJs::Div_Trap_UInt ? Js::OpCode::DivU_I4 : Js::OpCode::Div_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Div_UInt:
        src1Opnd->SetType(TyUint32);
        src2Opnd->SetType(TyUint32);
        instr = IR::Instr::New(Js::OpCode::DivU_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Div_Int:
        instr = IR::Instr::New(Js::OpCode::Div_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Rem_Trap_UInt:
        src1Opnd->SetType(TyUint32);
        src2Opnd->SetType(TyUint32);
        // Fall through for trap
    case Js::OpCodeAsmJs::Rem_Trap_Int:
#ifdef _M_X64
        src2Opnd = BuildTrapIfZero(src2Opnd, offset);
#endif
        instr = IR::Instr::New(newOpcode == Js::OpCodeAsmJs::Rem_Trap_UInt ? Js::OpCode::RemU_I4 : Js::OpCode::Rem_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Rem_UInt:
        src1Opnd->SetType(TyUint32);
        src2Opnd->SetType(TyUint32);
        instr = IR::Instr::New(Js::OpCode::RemU_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Rem_Int:
        instr = IR::Instr::New(Js::OpCode::Rem_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::And_Int:
        instr = IR::Instr::New(Js::OpCode::And_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Or_Int:
        instr = IR::Instr::New(Js::OpCode::Or_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Xor_Int:
        instr = IR::Instr::New(Js::OpCode::Xor_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shl_Int:
        instr = IR::Instr::New(Js::OpCode::Shl_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shr_Int:
        instr = IR::Instr::New(Js::OpCode::Shr_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shr_UInt:
        instr = IR::Instr::New(Js::OpCode::ShrU_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLt_Int:
        instr = IR::Instr::New(Js::OpCode::CmLt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLe_Int:
        instr = IR::Instr::New(Js::OpCode::CmLe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGt_Int:
        instr = IR::Instr::New(Js::OpCode::CmGt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGe_Int:
        instr = IR::Instr::New(Js::OpCode::CmGe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmEq_Int:
        instr = IR::Instr::New(Js::OpCode::CmEq_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmNe_Int:
        instr = IR::Instr::New(Js::OpCode::CmNeq_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLt_UInt:
        instr = IR::Instr::New(Js::OpCode::CmUnLt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLe_UInt:
        instr = IR::Instr::New(Js::OpCode::CmUnLe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGt_UInt:
        instr = IR::Instr::New(Js::OpCode::CmUnGt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGe_UInt:
        instr = IR::Instr::New(Js::OpCode::CmUnGe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Min_Int:
        instr = IR::Instr::New(Js::OpCode::InlineMathMin, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Max_Int:
        instr = IR::Instr::New(Js::OpCode::InlineMathMax, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Imul_Int:
        instr = IR::Instr::New(Js::OpCode::InlineMathImul, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Rol_Int:
        instr = IR::Instr::New(Js::OpCode::Rol_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Ror_Int:
        instr = IR::Instr::New(Js::OpCode::Ror_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Ld_Db:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Neg_Db:
        instr = IR::Instr::New(Js::OpCode::Neg_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Sin_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathSin, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Cos_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathCos, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Tan_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathTan, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Asin_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathAsin, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Acos_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathAcos, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Atan_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathAtan, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Abs_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathAbs, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Ceil_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathCeil, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Floor_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathFloor, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Exp_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathExp, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Log_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathLog, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Sqrt_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathSqrt, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Return_Db:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        if (m_func->IsLoopBody())
        {
            IR::Instr* slotInstr = GenerateStSlotForReturn(srcOpnd, IRType::TyFloat64);
            AddInstr(slotInstr, offset);
        }
        break;
    case Js::OpCodeAsmJs::I_Conv_VTD:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Trunc_Db:
        instr = IR::Instr::New(Js::OpCode::Trunc_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Nearest_Db:
        instr = IR::Instr::New(Js::OpCode::Nearest_A, dstOpnd, srcOpnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat32);
    srcOpnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Ld_Flt:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Neg_Flt:
        instr = IR::Instr::New(Js::OpCode::Neg_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Ceil_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathCeil, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Floor_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathFloor, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Sqrt_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathSqrt, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Abs_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathAbs, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Fround_Flt:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Return_Flt:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        if (m_func->IsLoopBody())
        {
            IR::Instr* slotInstr = GenerateStSlotForReturn(srcOpnd, IRType::TyFloat32);
            AddInstr(slotInstr, offset);
        }
        break;
    case Js::OpCodeAsmJs::I_Conv_VTF:
        instr = IR::Instr::New(Js::OpCode::Ld_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Trunc_Flt:
        instr = IR::Instr::New(Js::OpCode::Trunc_A, dstOpnd, srcOpnd, m_func);
        break;
    case Js::OpCodeAsmJs::Nearest_Flt:
        instr = IR::Instr::New(Js::OpCode::Nearest_A, dstOpnd, srcOpnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat32);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat32);
    src2Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Add_Flt:
        instr = IR::Instr::New(Js::OpCode::Add_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Sub_Flt:
        instr = IR::Instr::New(Js::OpCode::Sub_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Mul_Flt:
        instr = IR::Instr::New(Js::OpCode::Mul_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Div_Flt:
        instr = IR::Instr::New(Js::OpCode::Div_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Copysign_Flt:
        instr = IR::Instr::New(Js::OpCode::Copysign_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Min_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathMin, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Max_Flt:
        instr = IR::Instr::New(Js::OpCode::InlineMathMax, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat1Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Fround_Db);

    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::InlineMathFround, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Fround_Int || newOpcode == Js::OpCodeAsmJs::Conv_UTF || newOpcode == Js::OpCodeAsmJs::Reinterpret_ITF);

    Js::OpCode op = Js::OpCode::Conv_Prim;
    IR::RegOpnd * srcOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Fround_Int:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
        break;
    case Js::OpCodeAsmJs::Conv_UTF:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyUint32);
        break;
    case Js::OpCodeAsmJs::Reinterpret_ITF:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
        op = Js::OpCode::Reinterpret_Prim;
        break;
    default:
        Assume(UNREACHED);
    }

    srcOpnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(op, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat64);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat64);
    src2Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Add_Db:
        instr = IR::Instr::New(Js::OpCode::Add_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Sub_Db:
        instr = IR::Instr::New(Js::OpCode::Sub_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Mul_Db:
        instr = IR::Instr::New(Js::OpCode::Mul_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Div_Db:
        instr = IR::Instr::New(Js::OpCode::Div_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Rem_Db:
        instr = IR::Instr::New(Js::OpCode::Rem_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Pow_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathPow, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Atan2_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathAtan2, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Min_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathMin, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Max_Db:
        instr = IR::Instr::New(Js::OpCode::InlineMathMax, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Copysign_Db:
        instr = IR::Instr::New(Js::OpCode::Copysign_A, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildBrInt1(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_BrInt1<SizePolicy>>();
    BuildBrInt1(newOpcode, offset, layout->RelativeJumpOffset, layout->I1);
}

void
IRBuilderAsmJs::BuildBrInt1(Js::OpCodeAsmJs newOpcode, uint32 offset, int32 relativeOffset, Js::RegSlot src)
{
    Js::OpCode op = Js::OpCode::Nop;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::BrTrue_Int:
        op = Js::OpCode::BrTrue_I4;
        break;
    case Js::OpCodeAsmJs::BrFalse_Int:
        op = Js::OpCode::BrFalse_I4;
        break;
    default:
        Assume(UNREACHED);
    }
    Js::RegSlot src1RegSlot = GetRegSlotFromIntReg(src);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt32);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    uint targetOffset = m_jnReader.GetCurrentOffset() + relativeOffset;

    IR::BranchInstr * branchInstr = IR::BranchInstr::New(op, nullptr, src1Opnd, m_func);
    AddBranchInstr(branchInstr, offset, targetOffset);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildBrInt2(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_BrInt2<SizePolicy>>();
    BuildBrInt2(newOpcode, offset, layout->RelativeJumpOffset, layout->I1, layout->I2);
}

template <typename SizePolicy>
void
IRBuilderAsmJs::BuildBrInt1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_BrInt1Const1<SizePolicy>>();
    BuildBrInt1Const1(newOpcode, offset, layout->RelativeJumpOffset, layout->I1, layout->C1);
}

void
IRBuilderAsmJs::BuildBrInt2(Js::OpCodeAsmJs newOpcode, uint32 offset, int32 relativeOffset, Js::RegSlot src1, Js::RegSlot src2)
{
    Js::RegSlot src1RegSlot = GetRegSlotFromIntReg(src1);
    Js::RegSlot src2RegSlot = GetRegSlotFromIntReg(src2);

    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt32);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    BuildBrCmp(newOpcode, offset, relativeOffset, src1Opnd, src2Opnd);
}

void
IRBuilderAsmJs::BuildBrInt1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset, int32 relativeOffset, Js::RegSlot src1, int32 src2)
{
    Js::RegSlot src1RegSlot = GetRegSlotFromIntReg(src1);

    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt32);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::Opnd * src2Opnd = IR::IntConstOpnd::New(src2, TyInt32, this->m_func);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    BuildBrCmp(newOpcode, offset, relativeOffset, src1Opnd, src2Opnd);
}

void
IRBuilderAsmJs::BuildBrCmp(Js::OpCodeAsmJs newOpcode, uint32 offset, int32 relativeOffset, IR::RegOpnd* src1Opnd, IR::Opnd* src2Opnd)
{
    uint targetOffset = m_jnReader.GetCurrentOffset() + relativeOffset;

    if (newOpcode == Js::OpCodeAsmJs::Case_Int || newOpcode == Js::OpCodeAsmJs::Case_IntConst)
    {
        // branches for cases are generated entirely by the switch builder
        m_switchBuilder.OnCase(
            src1Opnd,
            src2Opnd,
            offset,
            targetOffset);
    }
    else
    {
        Assert(newOpcode == Js::OpCodeAsmJs::BrEq_Int);
        IR::BranchInstr * branchInstr = IR::BranchInstr::New(Js::OpCode::BrEq_I4, nullptr, src1Opnd, src2Opnd, m_func);
        AddBranchInstr(branchInstr, offset, targetOffset);
    }
}

void
IRBuilderAsmJs::BuildLong1Reg1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Conv_VTL);
    BuildFromVar(offset, dstRegSlot, src1RegSlot, TyInt64, ValueType::GetInt(false));
}

void
IRBuilderAsmJs::BuildReg1Long1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstReg, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt64);
    srcOpnd->SetValueType(ValueType::GetInt(false));

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::ArgOut_Long:
        BuildArgOut(srcOpnd, dstReg, offset, TyVar);
        break;
    case Js::OpCodeAsmJs::I_ArgOut_Long:
        BuildArgOut(srcOpnd, dstReg, offset, TyInt64, ValueType::GetInt(false));
        break;
    default:
        Assume(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildLong1Const1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, int64 constInt64)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Ld_LongConst);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, IR::Int64ConstOpnd::New(constInt64, TyInt64, m_func), m_func);

    if (dstOpnd->m_sym->IsSingleDef())
    {
        dstOpnd->m_sym->SetIsInt64Const();
    }

    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildLong2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt64);
    srcOpnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Ld_Long:
        instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Clz_Long:
        instr = IR::Instr::New(Js::OpCode::InlineMathClz, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Ctz_Long:
        instr = IR::Instr::New(Js::OpCode::Ctz, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::PopCnt_Long:
        instr = IR::Instr::New(Js::OpCode::PopCnt, dstOpnd, srcOpnd, m_func);
        break;

    case Js::OpCodeAsmJs::Return_Long:
        instr = IR::Instr::New(Js::OpCode::Ld_I4, dstOpnd, srcOpnd, m_func);
        if (m_func->IsLoopBody())
        {
            IR::Instr* slotInstr = GenerateStSlotForReturn(srcOpnd, IRType::TyInt64);
            AddInstr(slotInstr, offset);
        }
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildLong3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt64);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt64);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Add_Long:
        instr = IR::Instr::New(Js::OpCode::Add_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Sub_Long:
        instr = IR::Instr::New(Js::OpCode::Sub_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;

    case Js::OpCodeAsmJs::Mul_Long:
        instr = IR::Instr::New(Js::OpCode::Mul_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Div_Trap_ULong:
        src1Opnd->SetType(TyUint64);
        src2Opnd->SetType(TyUint64);
        // Fall Through for trap
    case Js::OpCodeAsmJs::Div_Trap_Long:
    {
#ifdef _M_X64
        src2Opnd = BuildTrapIfZero(src2Opnd, offset);
        if (newOpcode == Js::OpCodeAsmJs::Div_Trap_Long)
        {
            src1Opnd = BuildTrapIfMinIntOverNegOne(src1Opnd, src2Opnd, offset);
        }
#endif
        Js::OpCode op = newOpcode == Js::OpCodeAsmJs::Div_Trap_ULong ? Js::OpCode::DivU_I4 : Js::OpCode::Div_I4;
        instr = IR::Instr::New(op, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    }
    case Js::OpCodeAsmJs::Rem_Trap_ULong:
        src1Opnd->SetType(TyUint64);
        src2Opnd->SetType(TyUint64);
        // Fall Through for trap
    case Js::OpCodeAsmJs::Rem_Trap_Long:
    {
#ifdef _M_X64
        src2Opnd = BuildTrapIfZero(src2Opnd, offset);
#endif
        Js::OpCode op = newOpcode == Js::OpCodeAsmJs::Rem_Trap_ULong ? Js::OpCode::RemU_I4 : Js::OpCode::Rem_I4;
        instr = IR::Instr::New(op, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    }
    case Js::OpCodeAsmJs::And_Long:
        instr = IR::Instr::New(Js::OpCode::And_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Or_Long:
        instr = IR::Instr::New(Js::OpCode::Or_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Xor_Long:
        instr = IR::Instr::New(Js::OpCode::Xor_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shl_Long:
        instr = IR::Instr::New(Js::OpCode::Shl_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shr_Long:
        instr = IR::Instr::New(Js::OpCode::Shr_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Shr_ULong:
        instr = IR::Instr::New(Js::OpCode::ShrU_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Rol_Long:
        instr = IR::Instr::New(Js::OpCode::Rol_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::Ror_Long:
        instr = IR::Instr::New(Js::OpCode::Ror_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Long2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt64);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt64);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::CmLt_Long:
        instr = IR::Instr::New(Js::OpCode::CmLt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLe_Long:
        instr = IR::Instr::New(Js::OpCode::CmLe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGt_Long:
        instr = IR::Instr::New(Js::OpCode::CmGt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGe_Long:
        instr = IR::Instr::New(Js::OpCode::CmGe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmEq_Long:
        instr = IR::Instr::New(Js::OpCode::CmEq_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmNe_Long:
        instr = IR::Instr::New(Js::OpCode::CmNeq_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLt_ULong:
        instr = IR::Instr::New(Js::OpCode::CmUnLt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmLe_ULong:
        instr = IR::Instr::New(Js::OpCode::CmUnLe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGt_ULong:
        instr = IR::Instr::New(Js::OpCode::CmUnGt_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    case Js::OpCodeAsmJs::CmGe_ULong:
        instr = IR::Instr::New(Js::OpCode::CmUnGe_I4, dstOpnd, src1Opnd, src2Opnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildLong1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_ITL:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt32);
        break;

    case Js::OpCodeAsmJs::Conv_UTL:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyUint32);
        break;

    default:
        Assume(UNREACHED);
    }
    srcOpnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
    dstOpnd->SetValueType(ValueType::Float);

    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Long1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt64);
    src1Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    IR::Instr * instr = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Eqz_Long:
        instr = IR::Instr::New(Js::OpCode::CmEq_I4, dstOpnd, src1Opnd, IR::Int64ConstOpnd::New(0, TyInt64, m_func), m_func);
        break;
    case Js::OpCodeAsmJs::Conv_LTI:
        instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, src1Opnd, m_func);
        break;
    default:
        Assume(UNREACHED);
    }
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildLong1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat32);
    IR::RegOpnd * dstOpnd = nullptr;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_Check_FTL:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyInt64);
        break;
    case Js::OpCodeAsmJs::Conv_Check_FTUL:
        dstOpnd = BuildDstOpnd(dstRegSlot, TyUint64);
        break;
    default:
        Assume(UNREACHED);
    }

    IR::RegOpnd* tmpDst = IR::RegOpnd::New(src1Opnd->GetType(), m_func);
    tmpDst->SetValueType(ValueType::Float);
    AddInstr(IR::Instr::New(Js::OpCode::TrapIfTruncOverflow, tmpDst, src1Opnd, m_func), offset);
    dstOpnd->m_dontDeadStore = true;
    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, tmpDst, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat1Long1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot)
{
    IR::RegOpnd * srcOpnd = nullptr;
    IR::RegOpnd * dstOpnd  = BuildDstOpnd(dstRegSlot, TyFloat32);
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_LTF:
        srcOpnd = BuildSrcOpnd(src1RegSlot, TyInt64);
        break;
    case Js::OpCodeAsmJs::Conv_ULTF:
        srcOpnd = BuildSrcOpnd(src1RegSlot, TyUint64);
        break;
    default:
        Assume(UNREACHED);
    }
    IR::Instr * instr = IR::Instr::New(Js::OpCode::Conv_Prim, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildLong1Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TyFloat64);
    srcOpnd->SetValueType(ValueType::Float);

    IRType dstType;
    Js::OpCode op;
    bool doTruncTrapCheck = false;
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_Check_DTL:
        op = Js::OpCode::Conv_Prim;
        dstType = TyInt64;
        doTruncTrapCheck = true;
        break;
    case Js::OpCodeAsmJs::Conv_Check_DTUL:
        op = Js::OpCode::Conv_Prim;
        dstType = TyUint64;
        doTruncTrapCheck = true;
        break;
    case Js::OpCodeAsmJs::Reinterpret_DTL:
        op = Js::OpCode::Reinterpret_Prim;
        dstType = TyInt64;
        break;
    default:
        Assume(UNREACHED);
        Js::Throw::FatalInternalError();
    }

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, dstType);
    dstOpnd->SetValueType(ValueType::GetInt(false));
    if (doTruncTrapCheck)
    {
        IR::RegOpnd* tmpDst = IR::RegOpnd::New(srcOpnd->GetType(), m_func);
        tmpDst->SetValueType(ValueType::Float);
        AddInstr(IR::Instr::New(Js::OpCode::TrapIfTruncOverflow, tmpDst, srcOpnd, m_func), offset);
        dstOpnd->m_dontDeadStore = true;
        srcOpnd = tmpDst;
    }
    IR::Instr * instr = IR::Instr::New(op, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildDouble1Long1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot)
{
    IR::RegOpnd * srcOpnd = nullptr;
    Js::OpCode op = Js::OpCode::Conv_Prim;

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat64);
    dstOpnd->SetValueType(ValueType::Float);
    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Conv_LTD:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt64);
        break;
    case Js::OpCodeAsmJs::Conv_ULTD:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyUint64);
        break;
    case Js::OpCodeAsmJs::Reinterpret_LTD:
        srcOpnd = BuildSrcOpnd(srcRegSlot, TyInt64);
        op = Js::OpCode::Reinterpret_Prim;
        break;
    default:
        Assume(UNREACHED);
    }
    srcOpnd->SetValueType(ValueType::GetInt(false));
    IR::Instr* instr = IR::Instr::New(op, dstOpnd, srcOpnd, m_func);
    AddInstr(instr, offset);
}



///Loop Body Code

bool
IRBuilderAsmJs::IsLoopBody() const
{
    return m_func->IsLoopBody();
}

bool
IRBuilderAsmJs::IsLoopBodyReturnIPInstr(IR::Instr * instr) const
{
    IR::Opnd * dst = instr->GetDst();
    return (dst && dst->IsRegOpnd() && dst->AsRegOpnd()->m_sym == m_loopBodyRetIPSym);
}

bool
IRBuilderAsmJs::IsLoopBodyOuterOffset(uint offset) const
{
    if (!IsLoopBody())
    {
        return false;
    }

    return (offset >= m_func->GetWorkItem()->GetLoopHeader()->endOffset || offset < m_func->GetWorkItem()->GetLoopHeader()->startOffset);
}

uint
IRBuilderAsmJs::GetLoopBodyExitInstrOffset() const
{
    // End of loop body, start of StSlot and Ret instruction at endOffset + 1
    return m_func->GetWorkItem()->GetLoopHeader()->endOffset + 1;
}

IR::Instr *
IRBuilderAsmJs::CreateLoopBodyReturnIPInstr(uint targetOffset, uint offset)
{
    IR::RegOpnd * retOpnd = IR::RegOpnd::New(m_loopBodyRetIPSym, TyInt32, m_func);
    IR::IntConstOpnd * exitOffsetOpnd = IR::IntConstOpnd::New(targetOffset, TyInt32, m_func);
    return IR::Instr::New(Js::OpCode::Ld_I4, retOpnd, exitOffsetOpnd, m_func);
}

IR::Opnd *
IRBuilderAsmJs::InsertLoopBodyReturnIPInstr(uint targetOffset, uint offset)
{
    IR::Instr * setRetValueInstr = CreateLoopBodyReturnIPInstr(targetOffset, offset);
    this->AddInstr(setRetValueInstr, offset);
    return setRetValueInstr->GetDst();
}

IR::SymOpnd *
IRBuilderAsmJs::BuildAsmJsLoopBodySlotOpnd(SymID symId, IRType opndType)
{
    // There is no unsigned locals, make sure we create only signed locals
    opndType = IRType_EnsureSigned(opndType);
    // Get the interpreter frame instance that was passed in.
    StackSym *loopParamSym = m_func->EnsureLoopParamSym();

    // property ID is the offset
    Js::PropertyId propOffSet = CalculatePropertyOffset(symId, opndType);

    // Get the bytecodeRegSlot and Get the offset from m_localSlots
    PropertySym * fieldSym = PropertySym::FindOrCreate(loopParamSym->m_id, propOffSet, (uint32)-1, (uint)-1, PropertyKindLocalSlots, m_func);
    return IR::SymOpnd::New(fieldSym, opndType, m_func);
}

void
IRBuilderAsmJs::EnsureLoopBodyAsmJsLoadSlot(SymID symId, IRType type)
{
    if (this->m_ldSlots->TestAndSet(symId))
    {
        return;
    }

    IR::SymOpnd * fieldSymOpnd = this->BuildAsmJsLoopBodySlotOpnd(symId, type);

    StackSym * symDst = StackSym::FindOrCreate(symId, (Js::RegSlot)symId, m_func, fieldSymOpnd->GetType());
    IR::RegOpnd * dstOpnd = IR::RegOpnd::New(symDst, symDst->GetType(), m_func);
    IR::Instr * ldSlotInstr = IR::Instr::New(Js::OpCode::LdSlot, dstOpnd, fieldSymOpnd, m_func);

    m_func->m_headInstr->InsertAfter(ldSlotInstr);
    if (m_lastInstr == m_func->m_headInstr)
    {
        m_lastInstr = ldSlotInstr;
    }
}

void
IRBuilderAsmJs::GenerateLoopBodySlotAccesses(uint offset)
{
    //
    // The interpreter instance is passed as 0th argument to the JITted loop body function.
    // Always load the argument, then use it to generate any necessary store-slots.
    //
    uint16      argument = 0;

    StackSym *symSrc = StackSym::NewParamSlotSym(argument + 1, m_func);
    symSrc->m_offset = (argument + LowererMD::GetFormalParamOffset()) * MachPtr;
    symSrc->m_allocated = true;
    m_func->SetHasImplicitParamLoad();
    IR::SymOpnd *srcOpnd = IR::SymOpnd::New(symSrc, TyMachPtr, m_func);

    StackSym *loopParamSym = m_func->EnsureLoopParamSym();
    IR::RegOpnd *loopParamOpnd = IR::RegOpnd::New(loopParamSym, TyMachPtr, m_func);

    IR::Instr *instrArgIn = IR::Instr::New(Js::OpCode::ArgIn_A, loopParamOpnd, srcOpnd, m_func);
    m_func->m_headInstr->InsertAfter(instrArgIn);

    GenerateLoopBodyStSlots(loopParamSym->m_id, offset);
}

void
IRBuilderAsmJs::GenerateLoopBodyStSlots(SymID loopParamSymId, uint offset)
{
    if (this->m_stSlots->Count() == 0)
    {
        return;
    }

    FOREACH_BITSET_IN_FIXEDBV(regSlot, this->m_stSlots)
    {
        Assert(!this->RegIsConstant((Js::RegSlot)regSlot));
        IRType type = IRType::TyInt32;
        ValueType valueType = ValueType::GetInt(false);
        if (RegIsIntVar(regSlot))
        {
            type = IRType::TyInt32;
            valueType = ValueType::GetInt(false);
        }
        else if (RegIsFloatVar(regSlot))
        {
            type = IRType::TyFloat32;
            valueType = ValueType::Float;
        }
        else if (RegIsDoubleVar(regSlot))
        {
            type = IRType::TyFloat64;
            valueType = ValueType::Float;
        }
        else if (RegIsInt64Var(regSlot))
        {
            type = IRType::TyInt64;
            valueType = ValueType::GetInt(false);
        }
        else if (RegIsSimd128Var(regSlot))
        {
            type = IRType::TySimd128F4;
            // SIMD regs are non-typed. There is no way to know the incoming SIMD type to a StSlot after a loop body, so we pick any type.
            // However, at this point all src syms are already defined and assigned a type.
            valueType = ValueType::GetObject(ObjectType::UninitializedObject);
        }
        else
        {
            AnalysisAssert(UNREACHED);
        }

        Js::PropertyId propOffSet = CalculatePropertyOffset(regSlot, type);
        IR::RegOpnd* regOpnd = this->BuildSrcOpnd((Js::RegSlot)regSlot, type);
        regOpnd->SetValueType(valueType);

        // Get the bytecodeRegSlot and Get the offset from m_localSlots
        PropertySym * fieldSym = PropertySym::FindOrCreate(loopParamSymId, propOffSet, (uint32)-1, (uint)-1, PropertyKindLocalSlots, m_func);

        IR::SymOpnd * fieldSymOpnd = IR::SymOpnd::New(fieldSym, regOpnd->GetType(), m_func);
        Js::OpCode opcode = Js::OpCode::StSlot;
        IR::Instr * stSlotInstr = IR::Instr::New(opcode, fieldSymOpnd, regOpnd, m_func);
        this->AddInstr(stSlotInstr, offset);
    }
    NEXT_BITSET_IN_FIXEDBV;
}

Js::PropertyId IRBuilderAsmJs::CalculatePropertyOffset(SymID id, IRType type, bool isVar)
{
    // Compute the offset to the start of the interpreter frame's locals array as a Var index.
    size_t localsOffset = 0;
    if (!m_IsTJLoopBody)
    {
        localsOffset  = Js::InterpreterStackFrame::GetOffsetOfLocals();
    }
    Assert(localsOffset % sizeof(AsmJsSIMDValue) == 0);
    WAsmJs::Types asmType = WAsmJs::FromIRType(type);
    const auto typedInfo = m_asmFuncInfo->GetTypedSlotInfo(asmType);
    uint32 regSlot = 0;
    if (isVar)
    {
        // Get the bytecodeRegSlot
        regSlot = id - GetFirstVar(asmType) + typedInfo.constCount;
    }

    return (Js::PropertyId)(regSlot * TySize[type] + typedInfo.byteOffset + localsOffset);
}

IR::Instr* IRBuilderAsmJs::GenerateStSlotForReturn(IR::RegOpnd* srcOpnd, IRType retType)
{
    // Compute the offset to the start of the interpreter frame's locals array as a Var index.
    size_t localsOffset = 0;
    if (!m_IsTJLoopBody)
    {
        localsOffset = Js::InterpreterStackFrame::GetOffsetOfLocals();
    }
    Assert(localsOffset % sizeof(AsmJsSIMDValue) == 0);
    StackSym *loopParamSym = m_func->EnsureLoopParamSym();
    Js::PropertyId propOffSet = CalculatePropertyOffset(0, retType, false);
    // Get the bytecodeRegSlot and Get the offset from m_localSlots
    PropertySym * fieldSym = PropertySym::FindOrCreate(loopParamSym->m_id, propOffSet, (uint32)-1, (uint)-1, PropertyKindLocalSlots, m_func);
    IR::SymOpnd * fieldSymOpnd = IR::SymOpnd::New(fieldSym, srcOpnd->GetType(), m_func);
    Js::OpCode opcode = Js::OpCode::StSlot;
    IR::Instr * stSlotInstr = IR::Instr::New(opcode, fieldSymOpnd, srcOpnd, m_func);
    return stSlotInstr;
}

Js::OpCode IRBuilderAsmJs::GetSimdOpcode(Js::OpCodeAsmJs asmjsOpcode)
{
    Js::OpCode opcode = (Js::OpCode) 0;
    Assert(IsSimd128AsmJsOpcode(asmjsOpcode));
    if (asmjsOpcode <= Js::OpCodeAsmJs::Simd128_End)
    {
        opcode =  m_simdOpcodesMap[(uint32)((Js::OpCodeAsmJs)asmjsOpcode - Js::OpCodeAsmJs::Simd128_Start)];
    }
    else
    {
        Assert(asmjsOpcode >= Js::OpCodeAsmJs::Simd128_Start_Extend && asmjsOpcode <= Js::OpCodeAsmJs::Simd128_End_Extend);
        opcode = m_simdOpcodesMap[(uint32)((Js::OpCodeAsmJs)asmjsOpcode - Js::OpCodeAsmJs::Simd128_Start_Extend) + (uint32)(Js::OpCodeAsmJs::Simd128_End - Js::OpCodeAsmJs::Simd128_Start) + 1];
    }
    Assert(IsSimd128Opcode(opcode));
    return opcode;
}

void IRBuilderAsmJs::GetSimdTypesFromAsmType(Js::AsmJsType::Which asmType, IRType *pIRType, ValueType *pValueType /* = nullptr */)
{
    IRType irType = IRType::TyVar;
    ValueType vType = ValueType::Uninitialized;

#define SIMD_TYPE_CHECK(type1, type2, type3) \
case Js::AsmJsType::Which::##type1: \
        irType = type2; \
        vType = ValueType::GetSimd128(ObjectType::##type3); \
        break;

    switch (asmType)
    {
        SIMD_TYPE_CHECK(Float32x4,  TySimd128F4,    Simd128Float32x4)
        SIMD_TYPE_CHECK(Int32x4,    TySimd128I4,    Simd128Int32x4  )
        SIMD_TYPE_CHECK(Int16x8,    TySimd128I8,    Simd128Int16x8  )
        SIMD_TYPE_CHECK(Int8x16,    TySimd128I16,   Simd128Int8x16  )
        SIMD_TYPE_CHECK(Uint32x4,   TySimd128U4,    Simd128Uint32x4 )
        SIMD_TYPE_CHECK(Uint16x8,   TySimd128U8,    Simd128Uint16x8 )
        SIMD_TYPE_CHECK(Uint8x16,   TySimd128U16,   Simd128Uint8x16 )
        SIMD_TYPE_CHECK(Bool32x4,   TySimd128B4,    Simd128Bool32x4 )
        SIMD_TYPE_CHECK(Bool16x8,   TySimd128B8,    Simd128Bool16x8 )
        SIMD_TYPE_CHECK(Bool8x16,   TySimd128B16,   Simd128Bool8x16 )
    default:
        Assert(UNREACHED);
    }
    *pIRType = irType;
    if (pValueType)
    {
        *pValueType = vType;
    }
#undef SIMD_TYPE_CHECK
}

// !!NOTE: Always build the src opnds first, before dst. So we record the use of any temps before assigning new symId for the dst temp.
#define BUILD_SIMD_ARGS_REG2 Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot
#define BUILD_SIMD_ARGS_REG3 BUILD_SIMD_ARGS_REG2, Js::RegSlot src2RegSlot
#define BUILD_SIMD_ARGS_REG4 BUILD_SIMD_ARGS_REG3, Js::RegSlot src3RegSlot
#define BUILD_SIMD_ARGS_REG5 BUILD_SIMD_ARGS_REG4, Js::RegSlot src4RegSlot
#define BUILD_SIMD_ARGS_REG6 BUILD_SIMD_ARGS_REG5, Js::RegSlot src5RegSlot
#define BUILD_SIMD_ARGS_REG7 BUILD_SIMD_ARGS_REG6, Js::RegSlot src6RegSlot
#define BUILD_SIMD_ARGS_REG9 BUILD_SIMD_ARGS_REG7, Js::RegSlot src7RegSlot, Js::RegSlot src8RegSlot
#define BUILD_SIMD_ARGS_REG10 BUILD_SIMD_ARGS_REG9, Js::RegSlot src9RegSlot
#define BUILD_SIMD_ARGS_REG11 BUILD_SIMD_ARGS_REG10, Js::RegSlot src10RegSlot
#define BUILD_SIMD_ARGS_REG17 BUILD_SIMD_ARGS_REG11, Js::RegSlot src11RegSlot, Js::RegSlot src12RegSlot, Js::RegSlot src13RegSlot, Js::RegSlot src14RegSlot, Js::RegSlot src15RegSlot, Js::RegSlot src16RegSlot
#define BUILD_SIMD_ARGS_REG18 BUILD_SIMD_ARGS_REG17, Js::RegSlot src17RegSlot
#define BUILD_SIMD_ARGS_REG19 BUILD_SIMD_ARGS_REG18, Js::RegSlot src18RegSlot

// Float32x4
void
IRBuilderAsmJs::BuildFloat32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4);
}

void
IRBuilderAsmJs::BuildFloat32x4_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128F4);
}

void
IRBuilderAsmJs::BuildBool32x4_1Float32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B4, TySimd128F4);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Bool32x4_1Float32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128F4);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128F4);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_F4, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat32x4_4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128F4);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128F4);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);

    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_I4, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildFloat32x4_1Float4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG5)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat32);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat32);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TyFloat32);
    IR::RegOpnd * src4Opnd = BuildSrcOpnd(src4RegSlot, TyFloat32);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);

    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src1Opnd->SetValueType(ValueType::Float);
    src2Opnd->SetValueType(ValueType::Float);
    src3Opnd->SetValueType(ValueType::Float);
    src4Opnd->SetValueType(ValueType::Float);

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_FloatsToF4, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);

}

void
IRBuilderAsmJs::BuildFloat32x4_2Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG6)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_F4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat32x4_3Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG7)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128F4);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_F4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat32);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_F4);
    Js::OpCode opcode = Js::OpCode::Simd128_Splat_F4;

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat32x4_2Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat32);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

// Disable for now
#if 0
void
IRBuilderAsmJs::BuildFloat32x4_1Float64x2_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_FromFloat64x2_F4 || opcode == Js::OpCode::Simd128_FromFloat64x2Bits_F4, "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}
#endif // 0

void
IRBuilderAsmJs::BuildFloat32x4_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4_F4 || newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128I4);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4_F4 || newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128U4);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128I8);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128U8);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128I16);
}

void
IRBuilderAsmJs::BuildFloat32x4_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_F4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128F4, TySimd128U16);
}

void IRBuilderAsmJs::BuildReg1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_F4)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128F4);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }
        dstOpnd = IR::SymOpnd::New(symDst, TySimd128F4, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

/* Int32x4 */
void
IRBuilderAsmJs::BuildInt32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt32x4_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I4);
}

void
IRBuilderAsmJs::BuildBool32x4_1Int32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B4, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt32x4_1Bool32x4_1Int32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128I4);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128I4);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I4);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_I4, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildInt32x4_1Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG5)
{
    uint const LANES = 4;
    Js::RegSlot srcRegSlot[LANES];
    srcRegSlot[0] = src1RegSlot;
    srcRegSlot[1] = src2RegSlot;
    srcRegSlot[2] = src3RegSlot;
    srcRegSlot[3] = src4RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128I4, srcRegSlot, dstRegSlot, LANES);
}

void IRBuilderAsmJs::BuildInt32x4_2Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG6)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_I4);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_I4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildInt32x4_3Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG7)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128I4);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_I4);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_I4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildInt32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_I4);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt32x4_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I4);
}

//ReplaceLane
void
IRBuilderAsmJs::BuildInt32x4_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_I4), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt1Int32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_I4), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat32x4_2Int1Float1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TyFloat32);
    src3Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128F4);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3

    IR::Instr* instr = nullptr;

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    AssertMsg((opcode == Js::OpCode::Simd128_ReplaceLane_F4), "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat1Float32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyFloat32);
    dstOpnd->SetValueType(ValueType::Float);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_F4), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt32x4_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4_I4 || newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128F4);
}

void
IRBuilderAsmJs::BuildInt32x4_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128U4);
}

void
IRBuilderAsmJs::BuildInt32x4_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt32x4_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128U8);
}

void
IRBuilderAsmJs::BuildInt32x4_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128I16);
}

void
IRBuilderAsmJs::BuildInt32x4_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128U16);
}

#if 0
void
IRBuilderAsmJs::BuildInt32x4_1Float64x2_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat64x2_I4 || newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat64x2Bits_I4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I4, TySimd128D2);
}
#endif //0
void IRBuilderAsmJs::BuildReg1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_I4)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128I4);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128I4, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

//Int8x16
void
IRBuilderAsmJs::BuildInt8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16);
}
//
void
IRBuilderAsmJs::BuildInt8x16_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I16);
}

void IRBuilderAsmJs::BuildInt8x16_1Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG17)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToI16, "Unexpected opcode for this format.");
    uint const LANES = 16;
    Js::RegSlot srcRegSlots[LANES] = {
        srcRegSlots[0]  = src1RegSlot,
        srcRegSlots[1]  = src2RegSlot,
        srcRegSlots[2]  = src3RegSlot,
        srcRegSlots[3]  = src4RegSlot,
        srcRegSlots[4]  = src5RegSlot,
        srcRegSlots[5]  = src6RegSlot,
        srcRegSlots[6]  = src7RegSlot,
        srcRegSlots[7]  = src8RegSlot,
        srcRegSlots[8]  = src9RegSlot,
        srcRegSlots[9]  = src10RegSlot,
        srcRegSlots[10] = src11RegSlot,
        srcRegSlots[11] = src12RegSlot,
        srcRegSlots[12] = src13RegSlot,
        srcRegSlots[13] = src14RegSlot,
        srcRegSlots[14] = src15RegSlot,
        srcRegSlots[15] = src16RegSlot
    };

    BuildSimd_1Ints(newOpcode, offset, TySimd128I16, srcRegSlots, dstRegSlot, LANES);
}

void
IRBuilderAsmJs::BuildBool8x16_1Int8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B8, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt8x16_1Bool8x16_1Int8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B16);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128I16);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128I16);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I16);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_I16, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildInt8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_I16);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16);
}
//ExtractLane ReplaceLane
void
IRBuilderAsmJs::BuildInt8x16_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I16);
}

void
IRBuilderAsmJs::BuildInt8x16_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_I16), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128I16);
}

void
IRBuilderAsmJs::BuildInt1Int8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I16);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_I16), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildInt8x16_3Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG19)
{
    IR::RegOpnd * dstOpnd   = BuildDstOpnd(dstRegSlot, TySimd128I16);
    IR::RegOpnd * src1Opnd  = BuildSrcOpnd(src1RegSlot, TySimd128I16);
    IR::RegOpnd * src2Opnd  = BuildSrcOpnd(src2RegSlot, TySimd128I16);

    IR::RegOpnd* srcOpnds[16];

    srcOpnds[0] = BuildIntConstOpnd(src3RegSlot);
    srcOpnds[1] = BuildIntConstOpnd(src4RegSlot);
    srcOpnds[2] = BuildIntConstOpnd(src5RegSlot);
    srcOpnds[3] = BuildIntConstOpnd(src6RegSlot);
    srcOpnds[4] = BuildIntConstOpnd(src7RegSlot);
    srcOpnds[5] = BuildIntConstOpnd(src8RegSlot);
    srcOpnds[6] = BuildIntConstOpnd(src9RegSlot);
    srcOpnds[7] = BuildIntConstOpnd(src10RegSlot);
    srcOpnds[8] = BuildIntConstOpnd(src11RegSlot);
    srcOpnds[9] = BuildIntConstOpnd(src12RegSlot);
    srcOpnds[10] = BuildIntConstOpnd(src13RegSlot);
    srcOpnds[11] = BuildIntConstOpnd(src14RegSlot);
    srcOpnds[12] = BuildIntConstOpnd(src15RegSlot);
    srcOpnds[13] = BuildIntConstOpnd(src16RegSlot);
    srcOpnds[14] = BuildIntConstOpnd(src17RegSlot);
    srcOpnds[15] = BuildIntConstOpnd(src18RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);

    for (int i = 0; i < 16; ++i)
    {
        instr = AddExtendedArg(srcOpnds[i], instr->GetDst()->AsRegOpnd(), offset);
    }

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_I16);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_I16;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildInt8x16_2Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG18)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I16);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I16);

    IR::RegOpnd* srcOpnds[16];

    srcOpnds[0]  = BuildIntConstOpnd(src2RegSlot);
    srcOpnds[1]  = BuildIntConstOpnd(src3RegSlot);
    srcOpnds[2]  = BuildIntConstOpnd(src4RegSlot);
    srcOpnds[3]  = BuildIntConstOpnd(src5RegSlot);
    srcOpnds[4]  = BuildIntConstOpnd(src6RegSlot);
    srcOpnds[5]  = BuildIntConstOpnd(src7RegSlot);
    srcOpnds[6]  = BuildIntConstOpnd(src8RegSlot);
    srcOpnds[7]  = BuildIntConstOpnd(src9RegSlot);
    srcOpnds[8]  = BuildIntConstOpnd(src10RegSlot);
    srcOpnds[9]  = BuildIntConstOpnd(src11RegSlot);
    srcOpnds[10] = BuildIntConstOpnd(src12RegSlot);
    srcOpnds[11] = BuildIntConstOpnd(src13RegSlot);
    srcOpnds[12] = BuildIntConstOpnd(src14RegSlot);
    srcOpnds[13] = BuildIntConstOpnd(src15RegSlot);
    srcOpnds[14] = BuildIntConstOpnd(src16RegSlot);
    srcOpnds[15] = BuildIntConstOpnd(src17RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);

    for (int i = 0; i < 16; ++i)
    {
        instr = AddExtendedArg(srcOpnds[i], instr->GetDst()->AsRegOpnd(), offset);
    }

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_I16);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_I16;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildInt8x16_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128F4);
}

void
IRBuilderAsmJs::BuildInt8x16_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt8x16_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt8x16_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128U4);
}

void
IRBuilderAsmJs::BuildInt8x16_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128U8);
}

void
IRBuilderAsmJs::BuildInt8x16_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_I16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I16, TySimd128U16);
}

void IRBuilderAsmJs::BuildReg1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128I16);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_I16)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128I16);
        symDst->m_allocated = true;
        if (symDst == NULL || (uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }
        dstOpnd = IR::SymOpnd::New(symDst, TySimd128I16, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int8x16));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

/* Float64x2 */
// Disabled for now
#if 0
void
IRBuilderAsmJs::BuildFloat64x2_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode;

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Simd128_Return_D2:
    if (m_func->IsLoopBody())
    {
        IR::Instr* slotInstr = GenerateStSlotForReturn(src1Opnd, IRType::TySimd128D2);
        AddInstr(slotInstr, offset);
    }
    opcode = Js::OpCode::Ld_A;
    break;
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTD2:
    case Js::OpCodeAsmJs::Simd128_Ld_D2:
        opcode = Js::OpCode::Ld_A;
        break;
    default:
        opcode = GetSimdOpcode(newOpcode);
    }

    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128D2);
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode;

    opcode = GetSimdOpcode(newOpcode);

    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128D2);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128D2);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Clamp_D2, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildFloat64x2_1Double2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat64);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat64);
    src2Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_DoublesToD2, "Invalid backend SIMD opcode");
    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildFloat64x2_1Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyFloat64);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Splat_D2, "Invalid backend SIMD opcode");
    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_2Double1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyFloat64);
    src1Opnd->SetValueType(ValueType::Float);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_D2);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_D2;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_3Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG5)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128D2);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_D2);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_D2;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128F4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float32x4));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_FromFloat32x4_D2 || opcode == Js::OpCode::Simd128_FromFloat32x4Bits_D2, "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_FromInt32x4_D2 || opcode == Js::OpCode::Simd128_FromInt32x4Bits_D2, "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildFloat64x2_1Int32x4_1Float64x2_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128D2);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128D2);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128D2);

    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_D2, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildReg1Float64x2_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128D2);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_D2)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128D2);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }
        dstOpnd = IR::SymOpnd::New(symDst, TySimd128D2, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Float64x2));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}
#endif // 0

/* Int16x8 */
void IRBuilderAsmJs::BuildInt16x8_1Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG9)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToI8, "Unexpected opcode for this format.");

    uint const LANES = 8;
    Js::RegSlot srcRegSlots[LANES];

    srcRegSlots[0] = src1RegSlot;
    srcRegSlots[1] = src2RegSlot;
    srcRegSlots[2] = src3RegSlot;
    srcRegSlots[3] = src4RegSlot;
    srcRegSlots[4] = src5RegSlot;
    srcRegSlots[5] = src6RegSlot;
    srcRegSlots[6] = src7RegSlot;
    srcRegSlots[7] = src8RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128I8, srcRegSlots, dstRegSlot, LANES);
}

void IRBuilderAsmJs::BuildReg1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128I8);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_I8)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128I8);
        symDst->m_allocated = true;
        if (symDst == nullptr || (uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128I8, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildInt1Int16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I8);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_I8), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildInt16x8_2Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG10)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I8);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I8);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_I8);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_I8;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildInt16x8_3Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG11)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I8);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128I8);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128I8);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);
    IR::RegOpnd * src10Opnd = BuildIntConstOpnd(src10RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src10Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_I8);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_U8;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildInt16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_I8);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt16x8_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_I8), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt16x8_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I8);
}

void
IRBuilderAsmJs::BuildBool16x8_1Int16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B8, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt16x8_1Bool16x8_1Int16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B8);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128I8);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128I8);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128I8);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Int16x8));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_I8, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildInt16x8_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128I8);
}

void
IRBuilderAsmJs::BuildInt16x8_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128F4);
}

void
IRBuilderAsmJs::BuildInt16x8_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128I4);
}

void
IRBuilderAsmJs::BuildInt16x8_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128I16);
}
void
IRBuilderAsmJs::BuildInt16x8_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128U4);
}

void
IRBuilderAsmJs::BuildInt16x8_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128U8);
}

void
IRBuilderAsmJs::BuildInt16x8_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_I8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128I8, TySimd128U16);
}

/* Uint32x4 */
void IRBuilderAsmJs::BuildUint32x4_1Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG5)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToU4, "Unexpected opcode for this format.");

    uint const LANES = 4;
    Js::RegSlot srcRegSlot[LANES];
    srcRegSlot[0] = src1RegSlot;
    srcRegSlot[1] = src2RegSlot;
    srcRegSlot[2] = src3RegSlot;
    srcRegSlot[3] = src4RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128U4, srcRegSlot, dstRegSlot, LANES);
}

void IRBuilderAsmJs::BuildReg1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128U4);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_U4)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128U4);
        symDst->m_allocated = true;
        if (symDst == nullptr || (uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128U4, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildInt1Uint32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_U4), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildUint32x4_2Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG6)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U4);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_U4);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_U4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildUint32x4_3Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG7)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U4);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U4);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_U4);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_U4;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_U4);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint32x4_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_U4), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint32x4_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U4);
}

void
IRBuilderAsmJs::BuildBool32x4_1Uint32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B4, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint32x4_1Bool32x4_1Uint32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U4);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128U4);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U4);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint32x4));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_U4, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint32x4_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint32x4_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4_U4 || newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128F4);
}

void
IRBuilderAsmJs::BuildUint32x4_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128I4);
}

void
IRBuilderAsmJs::BuildUint32x4_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{;
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128I8);
}

/* Enable with Int8x16 support*/
void
IRBuilderAsmJs::BuildUint32x4_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128I16);
}

void
IRBuilderAsmJs::BuildUint32x4_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint32x4_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_U4, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U4, TySimd128U16);
}

/* Uint16x8 */
void IRBuilderAsmJs::BuildUint16x8_1Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG9)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToU8, "Unexpected opcode for this format.");

    uint const LANES = 8;
    Js::RegSlot srcRegSlots[LANES];

    srcRegSlots[0] = src1RegSlot;
    srcRegSlots[1] = src2RegSlot;
    srcRegSlots[2] = src3RegSlot;
    srcRegSlots[3] = src4RegSlot;
    srcRegSlots[4] = src5RegSlot;
    srcRegSlots[5] = src6RegSlot;
    srcRegSlots[6] = src7RegSlot;
    srcRegSlots[7] = src8RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128U8, srcRegSlots, dstRegSlot, LANES);
}

void IRBuilderAsmJs::BuildReg1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128U8);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_U8)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128U8);
        symDst->m_allocated = true;
        if (symDst == nullptr || (uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128U4, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildInt1Uint16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U8);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_U8), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildUint16x8_2Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG10)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U8);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U8);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_U8);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_U8;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildUint16x8_3Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG11)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U8);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U8);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U8);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);
    IR::RegOpnd * src10Opnd = BuildIntConstOpnd(src10RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src10Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_U8);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_U8;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_U8);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint16x8_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_U8), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint16x8_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U8);
}

void
IRBuilderAsmJs::BuildBool16x8_1Uint16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B8, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint16x8_1Bool16x8_1Uint16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B8);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U8);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128U8);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U8);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_U8, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint16x8_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U8);
}

void
IRBuilderAsmJs::BuildUint16x8_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128F4);
}

void
IRBuilderAsmJs::BuildUint16x8_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128I4);
}

void
IRBuilderAsmJs::BuildUint16x8_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128I8);
}

void
IRBuilderAsmJs::BuildUint16x8_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128I16);
}

void
IRBuilderAsmJs::BuildUint16x8_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint16x8_1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint8x16Bits_U8, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U8, TySimd128U16);
}
/* Uint8x16 */
void IRBuilderAsmJs::BuildUint8x16_1Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG17)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToU16, "Unexpected opcode for this format.");

    uint const LANES = 16;
    Js::RegSlot srcRegSlots[LANES];

    srcRegSlots[0] = src1RegSlot;
    srcRegSlots[1] = src2RegSlot;
    srcRegSlots[2] = src3RegSlot;
    srcRegSlots[3] = src4RegSlot;
    srcRegSlots[4] = src5RegSlot;
    srcRegSlots[5] = src6RegSlot;
    srcRegSlots[6] = src7RegSlot;
    srcRegSlots[7] = src8RegSlot;
    srcRegSlots[8] = src9RegSlot;
    srcRegSlots[9] = src10RegSlot;
    srcRegSlots[10] = src11RegSlot;
    srcRegSlots[11] = src12RegSlot;
    srcRegSlots[12] = src13RegSlot;
    srcRegSlots[13] = src14RegSlot;
    srcRegSlots[14] = src15RegSlot;
    srcRegSlots[15] = src16RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128U16, srcRegSlots, dstRegSlot, LANES);
}

void IRBuilderAsmJs::BuildReg1Uint8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128U16);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_U16)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128U16);
        symDst->m_allocated = true;
        if (symDst == nullptr || (uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128U16, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint16x8));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

void
IRBuilderAsmJs::BuildUint8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16);
}

void
IRBuilderAsmJs::BuildInt1Uint8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U16);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_U16), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildUint8x16_2Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG18)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U16);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U16);

    IR::RegOpnd * src2Opnd = BuildIntConstOpnd(src2RegSlot);
    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);
    IR::RegOpnd * src10Opnd = BuildIntConstOpnd(src10RegSlot);
    IR::RegOpnd * src11Opnd = BuildIntConstOpnd(src11RegSlot);
    IR::RegOpnd * src12Opnd = BuildIntConstOpnd(src12RegSlot);
    IR::RegOpnd * src13Opnd = BuildIntConstOpnd(src13RegSlot);
    IR::RegOpnd * src14Opnd = BuildIntConstOpnd(src14RegSlot);
    IR::RegOpnd * src15Opnd = BuildIntConstOpnd(src15RegSlot);
    IR::RegOpnd * src16Opnd = BuildIntConstOpnd(src16RegSlot);
    IR::RegOpnd * src17Opnd = BuildIntConstOpnd(src17RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src10Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src11Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src12Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src13Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src14Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src15Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src16Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src17Opnd, instr->GetDst()->AsRegOpnd(), offset);
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Swizzle_U16);
    Js::OpCode opcode = Js::OpCode::Simd128_Swizzle_U16;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildUint8x16_3Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG19)
{
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U16);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128U16);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U16);

    IR::RegOpnd * src3Opnd = BuildIntConstOpnd(src3RegSlot);
    IR::RegOpnd * src4Opnd = BuildIntConstOpnd(src4RegSlot);
    IR::RegOpnd * src5Opnd = BuildIntConstOpnd(src5RegSlot);
    IR::RegOpnd * src6Opnd = BuildIntConstOpnd(src6RegSlot);
    IR::RegOpnd * src7Opnd = BuildIntConstOpnd(src7RegSlot);
    IR::RegOpnd * src8Opnd = BuildIntConstOpnd(src8RegSlot);
    IR::RegOpnd * src9Opnd = BuildIntConstOpnd(src9RegSlot);
    IR::RegOpnd * src10Opnd = BuildIntConstOpnd(src10RegSlot);
    IR::RegOpnd * src11Opnd = BuildIntConstOpnd(src11RegSlot);
    IR::RegOpnd * src12Opnd = BuildIntConstOpnd(src12RegSlot);
    IR::RegOpnd * src13Opnd = BuildIntConstOpnd(src13RegSlot);
    IR::RegOpnd * src14Opnd = BuildIntConstOpnd(src14RegSlot);
    IR::RegOpnd * src15Opnd = BuildIntConstOpnd(src15RegSlot);
    IR::RegOpnd * src16Opnd = BuildIntConstOpnd(src16RegSlot);
    IR::RegOpnd * src17Opnd = BuildIntConstOpnd(src17RegSlot);
    IR::RegOpnd * src18Opnd = BuildIntConstOpnd(src18RegSlot);

    IR::Instr * instr = nullptr;
    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src4Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src5Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src6Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src7Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src8Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src9Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src10Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src11Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src12Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src13Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src14Opnd, instr->GetDst()->AsRegOpnd(), offset);

    instr = AddExtendedArg(src15Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src16Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src17Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src18Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Shuffle_U16);
    Js::OpCode opcode = Js::OpCode::Simd128_Shuffle_U16;

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint8x16_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_U16), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128U16);
}

void
IRBuilderAsmJs::BuildUint8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_U16);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16);
}

void
IRBuilderAsmJs::BuildUint8x16_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U16);
}

void
IRBuilderAsmJs::BuildBool8x16_1Uint8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B16, TySimd128U16);
}

void
IRBuilderAsmJs::BuildUint8x16_1Bool8x16_1Uint8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B16);
    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TySimd128U16);
    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TySimd128U16);
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TySimd128U16);
    IR::Instr * instr = nullptr;

    dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));
    src2Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));
    src3Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Uint8x16));

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3
    // Later phases will chain the arguments by following singleDefInstr of each use of ti.

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg(opcode == Js::OpCode::Simd128_Select_U16, "Unexpected opcode for this format.");
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void
IRBuilderAsmJs::BuildUint8x16_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_2Int1(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128U16);
}

void
IRBuilderAsmJs::BuildUint8x16_1Float32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromFloat32x4Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128F4);
}

void
IRBuilderAsmJs::BuildUint8x16_1Int32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt32x4Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128I4);
}

void
IRBuilderAsmJs::BuildUint8x16_1Int16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt16x8Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128I8);
}

/* Enable with Int8x16 support */
void
IRBuilderAsmJs::BuildUint8x16_1Int8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromInt8x16Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128I16);
}

void
IRBuilderAsmJs::BuildUint8x16_1Uint32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint32x4Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128U4);
}

void
IRBuilderAsmJs::BuildUint8x16_1Uint16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_FromUint16x8Bits_U16, "Unexpected opcode for this format.");
    BuildSimdConversion(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128U16, TySimd128U8);
}
//Bool32x4
void IRBuilderAsmJs::BuildBool32x4_1Int4(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG5)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToB4, "Unexpected opcode for this format.");

    uint const LANES = 4;
    Js::RegSlot srcRegSlot[LANES];
    srcRegSlot[0] = src1RegSlot;
    srcRegSlot[1] = src2RegSlot;
    srcRegSlot[2] = src3RegSlot;
    srcRegSlot[3] = src4RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128B4, srcRegSlot, dstRegSlot, LANES);
}

void
IRBuilderAsmJs::BuildInt1Bool32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_AllTrue_B4 || opcode == Js::OpCode::Simd128_AnyTrue_B4),
        "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildBool32x4_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B4);
}

void
IRBuilderAsmJs::BuildBool32x4_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B4);
}

void IRBuilderAsmJs::BuildReg1Bool32x4_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_B4)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128B4);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128B4, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

//Bool16x8
void IRBuilderAsmJs::BuildBool16x8_1Int8(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG9)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToB8, "Unexpected opcode for this format.");

    uint const LANES = 8;
    Js::RegSlot srcRegSlots[LANES];

    srcRegSlots[0] = src1RegSlot;
    srcRegSlots[1] = src2RegSlot;
    srcRegSlots[2] = src3RegSlot;
    srcRegSlots[3] = src4RegSlot;
    srcRegSlots[4] = src5RegSlot;
    srcRegSlots[5] = src6RegSlot;
    srcRegSlots[6] = src7RegSlot;
    srcRegSlots[7] = src8RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128B8, srcRegSlots, dstRegSlot, LANES);
}

void
IRBuilderAsmJs::BuildInt1Bool16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B8);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_AllTrue_B8 || opcode == Js::OpCode::Simd128_AnyTrue_B8),
        "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildBool16x8_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B8);
}

void
IRBuilderAsmJs::BuildBool16x8_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B8);
}

void
IRBuilderAsmJs::BuildReg1Bool16x8_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128B8);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_B8)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128B8);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128B8, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

//Bool8x16
void IRBuilderAsmJs::BuildBool8x16_1Int16(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG17)
{
    AssertMsg(newOpcode == Js::OpCodeAsmJs::Simd128_IntsToB16, "Unexpected opcode for this format.");

    uint const LANES = 16;
    Js::RegSlot srcRegSlots[LANES];

    srcRegSlots[0] = src1RegSlot;
    srcRegSlots[1] = src2RegSlot;
    srcRegSlots[2] = src3RegSlot;
    srcRegSlots[3] = src4RegSlot;
    srcRegSlots[4] = src5RegSlot;
    srcRegSlots[5] = src6RegSlot;
    srcRegSlots[6] = src7RegSlot;
    srcRegSlots[7] = src8RegSlot;
    srcRegSlots[8] = src9RegSlot;
    srcRegSlots[9] = src10RegSlot;
    srcRegSlots[10] = src11RegSlot;
    srcRegSlots[11] = src12RegSlot;
    srcRegSlots[12] = src13RegSlot;
    srcRegSlots[13] = src14RegSlot;
    srcRegSlots[14] = src15RegSlot;
    srcRegSlots[15] = src16RegSlot;

    BuildSimd_1Ints(newOpcode, offset, TySimd128B16, srcRegSlots, dstRegSlot, LANES);
}

void
IRBuilderAsmJs::BuildInt1Bool8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B16);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_AllTrue_B16 || opcode == Js::OpCode::Simd128_AnyTrue_B16),
        "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildBool8x16_2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    BuildSimd_2(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B16);
}

void
IRBuilderAsmJs::BuildBool8x16_3(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, TySimd128B16);
}

void IRBuilderAsmJs::BuildReg1Bool8x16_1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    IR::RegOpnd * srcOpnd = BuildSrcOpnd(src1RegSlot, TySimd128B16);
    srcOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));

    IR::Instr * instr = nullptr;
    IR::Opnd * dstOpnd = nullptr;
    StackSym * symDst = nullptr;

    if (newOpcode == Js::OpCodeAsmJs::Simd128_I_ArgOut_B16)
    {
        symDst = StackSym::NewArgSlotSym((uint16)dstRegSlot, m_func, TySimd128B16);
        symDst->m_allocated = true;
        if ((uint16)(dstRegSlot) != (dstRegSlot))
        {
            AssertMsg(UNREACHED, "Arg count too big...");
            Fatal();
        }

        dstOpnd = IR::SymOpnd::New(symDst, TySimd128B16, m_func);
        dstOpnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));

        instr = IR::Instr::New(Js::OpCode::ArgOut_A, dstOpnd, srcOpnd, m_func);
        AddInstr(instr, offset);

        m_argStack->Push(instr);
    }
    else
    {
        Assert(UNREACHED);
    }
}

//Bool extractLane/ReplaceLane
void
IRBuilderAsmJs::BuildBool32x4_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_B4), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128B4);
}

void
IRBuilderAsmJs::BuildBool16x8_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_B8), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128B8);
}

void
IRBuilderAsmJs::BuildBool8x16_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG4)
{
    AssertMsg((newOpcode == Js::OpCodeAsmJs::Simd128_ReplaceLane_B16), "Unexpected opcode for this format.");
    BuildSimd_2Int2(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, src3RegSlot, TySimd128B16);
}

void
IRBuilderAsmJs::BuildInt1Bool32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B4);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool32x4));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_B4), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Bool16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B8);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool16x8));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_B8), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void
IRBuilderAsmJs::BuildInt1Bool8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG3)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TySimd128B16);
    src1Opnd->SetValueType(ValueType::GetSimd128(ObjectType::Simd128Bool8x16));

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, TyInt32);
    dstOpnd->SetValueType(ValueType::GetInt(false));

    Js::OpCode opcode = GetSimdOpcode(newOpcode);

    AssertMsg((opcode == Js::OpCode::Simd128_ExtractLane_B16), "Unexpected opcode for this format.");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildSimd_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, IRType simdType)
{
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, TyInt32);
    src1Opnd->SetValueType(ValueType::GetInt(false));
    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, simdType);
    dstOpnd->SetValueType(GetSimdValueTypeFromIRType(simdType));
    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildSimd_2Int2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot, Js::RegSlot src3RegSlot, IRType simdType)
{
    ValueType valueType = GetSimdValueTypeFromIRType(simdType);

    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, simdType);
    src1Opnd->SetValueType(valueType);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * src3Opnd = BuildSrcOpnd(src3RegSlot, TyInt32);
    src3Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, simdType);
    dstOpnd->SetValueType(valueType);

    // Given bytecode: dst = op s1, s2, s3
    // Generate:
    // t1 = ExtendedArg_A s1
    // t2 = ExtendedArg_A s2, t1
    // t3 = ExtendedArg_A s3, t2
    // dst = op t3

    IR::Instr* instr = nullptr;

    instr = AddExtendedArg(src1Opnd, nullptr, offset);
    instr = AddExtendedArg(src2Opnd, instr->GetDst()->AsRegOpnd(), offset);
    instr = AddExtendedArg(src3Opnd, instr->GetDst()->AsRegOpnd(), offset);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

void IRBuilderAsmJs::BuildSimd_2(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, IRType simdType)
{
    ValueType valueType = GetSimdValueTypeFromIRType(simdType);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, simdType);
    src1Opnd->SetValueType(valueType);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, simdType);
    dstOpnd->SetValueType(valueType);

    Js::OpCode opcode;

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Simd128_Return_F4:
    case Js::OpCodeAsmJs::Simd128_Return_I4:
    case Js::OpCodeAsmJs::Simd128_Return_I8:
    case Js::OpCodeAsmJs::Simd128_Return_I16:
    case Js::OpCodeAsmJs::Simd128_Return_U4:
    case Js::OpCodeAsmJs::Simd128_Return_U8:
    case Js::OpCodeAsmJs::Simd128_Return_U16:
    case Js::OpCodeAsmJs::Simd128_Return_B4:
    case Js::OpCodeAsmJs::Simd128_Return_B8:
    case Js::OpCodeAsmJs::Simd128_Return_B16:
        if (m_func->IsLoopBody())
        {
            IR::Instr* slotInstr = GenerateStSlotForReturn(src1Opnd, simdType);
            AddInstr(slotInstr, offset);
        }
        opcode = Js::OpCode::Ld_A;
        break;
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTF4:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTI4:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTI8:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTI16:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTU4:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTU8:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTU16:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTB4:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTB8:
    case Js::OpCodeAsmJs::Simd128_I_Conv_VTB16:
    case Js::OpCodeAsmJs::Simd128_Ld_F4:
    case Js::OpCodeAsmJs::Simd128_Ld_I4:
    case Js::OpCodeAsmJs::Simd128_Ld_I8:
    case Js::OpCodeAsmJs::Simd128_Ld_I16:
    case Js::OpCodeAsmJs::Simd128_Ld_U4:
    case Js::OpCodeAsmJs::Simd128_Ld_U8:
    case Js::OpCodeAsmJs::Simd128_Ld_U16:
    case Js::OpCodeAsmJs::Simd128_Ld_B4:
    case Js::OpCodeAsmJs::Simd128_Ld_B8:
    case Js::OpCodeAsmJs::Simd128_Ld_B16:
        opcode = Js::OpCode::Ld_A;
        break;
    default:
        opcode = GetSimdOpcode(newOpcode);
    }

    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

void IRBuilderAsmJs::BuildSimd_2Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot, IRType simdType)
{
    ValueType valueType = GetSimdValueTypeFromIRType(simdType);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, simdType);
    src1Opnd->SetValueType(valueType);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, TyInt32);
    src2Opnd->SetValueType(ValueType::GetInt(false));

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, simdType);
    dstOpnd->SetValueType(valueType);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}
void IRBuilderAsmJs::BuildSimd_3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot, IRType simdType)
{
    BuildSimd_3(newOpcode, offset, dstRegSlot, src1RegSlot, src2RegSlot, simdType, simdType);
}

void IRBuilderAsmJs::BuildSimd_3(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot src1RegSlot, Js::RegSlot src2RegSlot, IRType dstSimdType, IRType srcSimdType)
{
    ValueType valueType = GetSimdValueTypeFromIRType(srcSimdType);
    IR::RegOpnd * src1Opnd = BuildSrcOpnd(src1RegSlot, srcSimdType);
    src1Opnd->SetValueType(valueType);

    IR::RegOpnd * src2Opnd = BuildSrcOpnd(src2RegSlot, srcSimdType);
    src2Opnd->SetValueType(valueType);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, dstSimdType);
    dstOpnd->SetValueType(GetSimdValueTypeFromIRType(dstSimdType));

    Js::OpCode opcode;

    opcode = GetSimdOpcode(newOpcode);

    AssertMsg((uint32)opcode, "Invalid backend SIMD opcode");

    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, src2Opnd, m_func);
    AddInstr(instr, offset);
}

// bool32x4
void
IRBuilderAsmJs::BuildBool32x4_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_B4);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B4);
}

// bool16x8
void
IRBuilderAsmJs::BuildBool16x8_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_B8);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B8);
}

// bool8x16
void
IRBuilderAsmJs::BuildBool8x16_1Int1(Js::OpCodeAsmJs newOpcode, uint32 offset, BUILD_SIMD_ARGS_REG2)
{
    Assert(newOpcode == Js::OpCodeAsmJs::Simd128_Splat_B16);
    BuildSimd_1Int1(newOpcode, offset, dstRegSlot, src1RegSlot, TySimd128B16);
}

void IRBuilderAsmJs::BuildSimdConversion(Js::OpCodeAsmJs newOpcode, uint32 offset, Js::RegSlot dstRegSlot, Js::RegSlot srcRegSlot, IRType dstSimdType, IRType srcSimdType)
{
    ValueType srcValueType = GetSimdValueTypeFromIRType(srcSimdType);
    ValueType dstValueType = GetSimdValueTypeFromIRType(dstSimdType);

    IR::RegOpnd * src1Opnd = BuildSrcOpnd(srcRegSlot, srcSimdType);
    src1Opnd->SetValueType(srcValueType);

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, dstSimdType);
    dstOpnd->SetValueType(dstValueType);

    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    IR::Instr * instr = IR::Instr::New(opcode, dstOpnd, src1Opnd, m_func);
    AddInstr(instr, offset);
}

ValueType IRBuilderAsmJs::GetSimdValueTypeFromIRType(IRType type)
{
    switch (type)
    {
    case TySimd128F4:
        return ValueType::GetSimd128(ObjectType::Simd128Float32x4);
    case TySimd128D2:
        return ValueType::GetSimd128(ObjectType::Simd128Float64x2);
    case TySimd128I4:
        return ValueType::GetSimd128(ObjectType::Simd128Int32x4);
    case TySimd128I8:
        return ValueType::GetSimd128(ObjectType::Simd128Int16x8);
    case TySimd128I16:
        return ValueType::GetSimd128(ObjectType::Simd128Int8x16);
    case TySimd128U4:
        return ValueType::GetSimd128(ObjectType::Simd128Uint32x4);
    case TySimd128U8:
        return ValueType::GetSimd128(ObjectType::Simd128Uint16x8);
    case TySimd128U16:
        return ValueType::GetSimd128(ObjectType::Simd128Uint8x16);
    case TySimd128B4:
        return ValueType::GetSimd128(ObjectType::Simd128Bool32x4);
    case TySimd128B8:
        return ValueType::GetSimd128(ObjectType::Simd128Bool16x8);
    case TySimd128B16:
        return ValueType::GetSimd128(ObjectType::Simd128Bool8x16);
    default:
        Assert(UNREACHED);
    }
    return ValueType::GetObject(ObjectType::UninitializedObject);

}

void IRBuilderAsmJs::BuildSimd_1Ints(Js::OpCodeAsmJs newOpcode, uint32 offset, IRType dstSimdType, Js::RegSlot* srcRegSlots, Js::RegSlot dstRegSlot, uint LANES)
{

    Assert(dstSimdType == TySimd128B4 || dstSimdType == TySimd128I4 || dstSimdType == TySimd128U4 ||
           dstSimdType == TySimd128B8 || dstSimdType == TySimd128I8 || dstSimdType == TySimd128U8 ||
           dstSimdType == TySimd128B16|| dstSimdType == TySimd128I16|| dstSimdType == TySimd128U16);

    IR::RegOpnd * srcOpnds[16];
    IR::Instr * instr = nullptr;
    Assert(LANES <= 16);
    Js::OpCode opcode = GetSimdOpcode(newOpcode);
    // first arg
    srcOpnds[0] = BuildSrcOpnd(srcRegSlots[0], TyInt32);
    srcOpnds[0]->SetValueType(ValueType::GetInt(false));
    instr = AddExtendedArg(srcOpnds[0], nullptr, offset);
    // reset of args
    for (uint i = 1; i < LANES && i < 16; i++)
    {
        srcOpnds[i] = BuildSrcOpnd(srcRegSlots[i], TyInt32);
        srcOpnds[i]->SetValueType(ValueType::GetInt(false));
        instr = AddExtendedArg(srcOpnds[i], instr->GetDst()->AsRegOpnd(), offset);
    }

    IR::RegOpnd * dstOpnd = BuildDstOpnd(dstRegSlot, dstSimdType);
    dstOpnd->SetValueType(GetSimdValueTypeFromIRType(dstSimdType));

    AddInstr(IR::Instr::New(opcode, dstOpnd, instr->GetDst(), m_func), offset);
}

template<typename SizePolicy>
void IRBuilderAsmJs::BuildAsmSimdTypedArr(Js::OpCodeAsmJs newOpcode, uint32 offset)
{
    Assert(OpCodeAttrAsmJs::HasMultiSizeLayout(newOpcode));
    auto layout = m_jnReader.GetLayout<Js::OpLayoutT_AsmSimdTypedArr<SizePolicy>>();
    BuildAsmSimdTypedArr(newOpcode, offset, layout->SlotIndex, layout->Value, layout->ViewType, layout->DataWidth);
}

void
IRBuilderAsmJs::BuildAsmSimdTypedArr(Js::OpCodeAsmJs newOpcode, uint32 offset, uint32 slotIndex, Js::RegSlot value, Js::ArrayBufferView::ViewType viewType, uint8 dataWidth)
{
    IRType type = TySimd128F4;
    Js::RegSlot valueRegSlot = GetRegSlotFromSimd128Reg(value);

    IR::RegOpnd * maskedOpnd = nullptr;
    IR::Instr * maskInstr = nullptr;

    Js::OpCode op = GetSimdOpcode(newOpcode);
    ValueType arrayType, valueType;
    bool isLd = false, isConst = false;
    uint32 mask = 0;

    switch (newOpcode)
    {
    case Js::OpCodeAsmJs::Simd128_LdArr_I4:
        valueType = ValueType::GetObject(ObjectType::Simd128Int32x4);
        isLd = true;
        isConst = false;
        type = TySimd128I4;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_I8:
        valueType = ValueType::GetObject(ObjectType::Simd128Int16x8);
        isLd = true;
        isConst = false;
        type = TySimd128I8;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_I16:
        valueType = ValueType::GetObject(ObjectType::Simd128Int8x16);
        isLd = true;
        isConst = false;
        type = TySimd128I16;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_U4:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint32x4);
        isLd = true;
        isConst = false;
        type = TySimd128U4;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_U8:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint16x8);
        isLd = true;
        isConst = false;
        type = TySimd128U8;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_U16:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint8x16);
        isLd = true;
        isConst = false;
        type = TySimd128U16;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArr_F4:
        valueType = ValueType::GetObject(ObjectType::Simd128Float32x4);
        isLd = true;
        isConst = false;
        type = TySimd128F4;
        break;
#if 0
    case Js::OpCodeAsmJs::Simd128_LdArr_D2:
        valueType = ValueType::GetObject(ObjectType::Simd128Float64x2);
        isLd = true;
        isConst = false;
        type = TySimd128D2;
        break;
#endif // 0

    case Js::OpCodeAsmJs::Simd128_StArr_I4:
        valueType = ValueType::GetObject(ObjectType::Simd128Int32x4);
        isLd = false;
        isConst = false;
        type = TySimd128I4;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_I8:
        valueType = ValueType::GetObject(ObjectType::Simd128Int16x8);
        isLd = false;
        isConst = false;
        type = TySimd128I8;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_I16:
        valueType = ValueType::GetObject(ObjectType::Simd128Int8x16);
        isLd = false;
        isConst = false;
        type = TySimd128I16;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_U4:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint32x4);
        isLd = false;
        isConst = false;
        type = TySimd128U4;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_U8:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint16x8);
        isLd = false;
        isConst = false;
        type = TySimd128U8;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_U16:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint8x16);
        isLd = false;
        isConst = false;
        type = TySimd128U16;
        break;
    case Js::OpCodeAsmJs::Simd128_StArr_F4:
        valueType = ValueType::GetObject(ObjectType::Simd128Float32x4);
        isLd = false;
        isConst = false;
        type = TySimd128F4;
        break;
#if 0
    case Js::OpCodeAsmJs::Simd128_StArr_D2:
        valueType = ValueType::GetObject(ObjectType::Simd128Float64x2);
        isLd = false;
        isConst = false;
        type = TySimd128D2;
        break;
#endif // 0

    case Js::OpCodeAsmJs::Simd128_LdArrConst_I4:
        valueType = ValueType::GetObject(ObjectType::Simd128Int32x4);
        isLd = true;
        isConst = true;
        type = TySimd128I4;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_I8:
        valueType = ValueType::GetObject(ObjectType::Simd128Int16x8);
        isLd = true;
        isConst = true;
        type = TySimd128I8;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_I16:
        valueType = ValueType::GetObject(ObjectType::Simd128Int8x16);
        isLd = true;
        isConst = true;
        type = TySimd128I16;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_U4:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint32x4);
        isLd = true;
        isConst = true;
        type = TySimd128U4;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_U8:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint16x8);
        isLd = true;
        isConst = true;
        type = TySimd128U8;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_U16:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint8x16);
        isLd = true;
        isConst = true;
        type = TySimd128U16;
        break;
    case Js::OpCodeAsmJs::Simd128_LdArrConst_F4:
        valueType = ValueType::GetObject(ObjectType::Simd128Float32x4);
        isLd = true;
        isConst = true;
        type = TySimd128F4;
        break;
#if 0
    case Js::OpCodeAsmJs::Simd128_LdArrConst_D2:
        valueType = ValueType::GetObject(ObjectType::Simd128Float64x2);
        isLd = true;
        isConst = true;
        type = TySimd128D2;
        break;
#endif
    case Js::OpCodeAsmJs::Simd128_StArrConst_I4:
        valueType = ValueType::GetObject(ObjectType::Simd128Int32x4);
        isLd = false;
        type = TySimd128I4;
        isConst = true;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_I8:
        valueType = ValueType::GetObject(ObjectType::Simd128Int16x8);
        isLd = false;
        isConst = true;
        type = TySimd128I8;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_I16:
        valueType = ValueType::GetObject(ObjectType::Simd128Int8x16);
        isLd = false;
        isConst = true;
        type = TySimd128I16;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_U4:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint32x4);
        isLd = false;
        isConst = true;
        type = TySimd128U4;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_U8:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint16x8);
        isLd = false;
        isConst = true;
        type = TySimd128U8;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_U16:
        valueType = ValueType::GetObject(ObjectType::Simd128Uint8x16);
        isLd = false;
        isConst = true;
        type = TySimd128U16;
        break;
    case Js::OpCodeAsmJs::Simd128_StArrConst_F4:
        valueType = ValueType::GetObject(ObjectType::Simd128Float32x4);
        isLd = false;
        isConst = true;
        type = TySimd128F4;
        break;
#if 0
    case Js::OpCodeAsmJs::Simd128_StArrConst_D2:
        valueType = ValueType::GetObject(ObjectType::Simd128Float64x2);
        isLd = false;
        isConst = true;
        type = TySimd128D2;
        break;
#endif
    default:
        Assert(UNREACHED);
    }

    switch (viewType)
    {
    case Js::ArrayBufferView::TYPE_INT8:
        arrayType = ValueType::GetObject(ObjectType::Int8Array);
        break;
    case Js::ArrayBufferView::TYPE_UINT8:
        arrayType = ValueType::GetObject(ObjectType::Uint8Array);
        break;
    case Js::ArrayBufferView::TYPE_INT16:
        arrayType = ValueType::GetObject(ObjectType::Int16Array);
        mask = (uint32)~1;
        break;
    case Js::ArrayBufferView::TYPE_UINT16:
        arrayType = ValueType::GetObject(ObjectType::Uint16Array);
        mask = (uint32)~1;
        break;
    case Js::ArrayBufferView::TYPE_INT32:
        arrayType = ValueType::GetObject(ObjectType::Int32Array);
        mask = (uint32)~3;
        break;
    case Js::ArrayBufferView::TYPE_UINT32:
        arrayType = ValueType::GetObject(ObjectType::Uint32Array);
        mask = (uint32)~3;
        break;
    case Js::ArrayBufferView::TYPE_FLOAT32:
        arrayType = ValueType::GetObject(ObjectType::Float32Array);
        mask = (uint32)~3;
        break;
    case Js::ArrayBufferView::TYPE_FLOAT64:
        arrayType = ValueType::GetObject(ObjectType::Float64Array);
        mask = (uint32)~7;
        break;
    default:
        Assert(UNREACHED);
    }

    IR::Opnd * sizeOpnd = BuildSrcOpnd(AsmJsRegSlots::LengthReg, TyUint32);
    if (!isConst)
    {

        Js::RegSlot indexRegSlot = GetRegSlotFromIntReg(slotIndex);

        if (mask)
        {
            // AND_I4 index, mask
            maskedOpnd = IR::RegOpnd::New(TyUint32, m_func);
            maskInstr = IR::Instr::New(Js::OpCode::And_I4, maskedOpnd, BuildSrcOpnd(indexRegSlot, TyInt32), IR::IntConstOpnd::New(mask, TyUint32, m_func), m_func);

        }
        else
        {
            maskedOpnd = BuildSrcOpnd(indexRegSlot, TyInt32);
        }
    }

    IR::Instr * instr = nullptr;
    IR::RegOpnd * regOpnd = nullptr;
    IR::IndirOpnd * indirOpnd = nullptr;
    IR::RegOpnd * baseOpnd = BuildSrcOpnd(AsmJsRegSlots::BufferReg, TyVar);
    baseOpnd->SetValueType(arrayType);
    baseOpnd->SetValueTypeFixed();

    if (isLd)
    {
        regOpnd = BuildDstOpnd(valueRegSlot, type);
        regOpnd->SetValueType(valueType);
        if (!isConst)
        {
            Assert(maskedOpnd);
            // Js::OpCodeAsmJs::Simd128_LdArr_I4:
            // Js::OpCodeAsmJs::Simd128_LdArr_F4:
            // Js::OpCodeAsmJs::Simd128_LdArr_D2:
            indirOpnd = IR::IndirOpnd::New(baseOpnd, maskedOpnd, type, m_func);
        }
        else
        {
            // Js::OpCodeAsmJs::Simd128_LdArrConst_I4:
            // Js::OpCodeAsmJs::Simd128_LdArrConst_F4:
            // Js::OpCodeAsmJs::Simd128_LdArrConst_D2:
            indirOpnd = IR::IndirOpnd::New(baseOpnd, slotIndex, type, m_func);
        }
        instr = IR::Instr::New(op, regOpnd, indirOpnd, sizeOpnd, m_func);
    }
    else
    {
        regOpnd = BuildSrcOpnd(valueRegSlot, type);
        regOpnd->SetValueType(valueType);
        if (!isConst)
        {
            Assert(maskedOpnd);
            // Js::OpCodeAsmJs::Simd128_StArr_I4:
            // Js::OpCodeAsmJs::Simd128_StArr_F4:
            // Js::OpCodeAsmJs::Simd128_StArr_D2:
            indirOpnd = IR::IndirOpnd::New(baseOpnd, maskedOpnd, type, m_func);
        }
        else
        {
            // Js::OpCodeAsmJs::Simd128_StArrConst_I4:
            // Js::OpCodeAsmJs::Simd128_StArrConst_F4:
            // Js::OpCodeAsmJs::Simd128_StArrConst_D2:
            indirOpnd = IR::IndirOpnd::New(baseOpnd, slotIndex, type, m_func);
        }
        instr = IR::Instr::New(op, indirOpnd, regOpnd, sizeOpnd, m_func);
    }
    // REVIEW: Store dataWidth in the instruction itself instead of an argument to avoid using ExtendedArgs or excessive opcodes.
    Assert(dataWidth >= 4 && dataWidth <= 16);
    instr->dataWidth = dataWidth;
    if (maskInstr)
    {
        AddInstr(maskInstr, offset);
    }
    AddInstr(instr, offset);

}
#endif