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definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
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//===----- LegalizeIntegerTypes.cpp - Legalization of integer types -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements integer type expansion and promotion for LegalizeTypes.
// Promotion is the act of changing a computation in an illegal type into a
// computation in a larger type.  For example, implementing i8 arithmetic in an
// i32 register (often needed on powerpc).
// Expansion is the act of changing a computation in an illegal type into a
// computation in two identical registers of a smaller type.  For example,
// implementing i64 arithmetic in two i32 registers (often needed on 32-bit
// targets).
//
//===----------------------------------------------------------------------===//

#include "LegalizeTypes.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

#define DEBUG_TYPE "legalize-types"

//===----------------------------------------------------------------------===//
//  Integer Result Promotion
//===----------------------------------------------------------------------===//

/// PromoteIntegerResult - This method is called when a result of a node is
/// found to be in need of promotion to a larger type.  At this point, the node
/// may also have invalid operands or may have other results that need
/// expansion, we just know that (at least) one result needs promotion.
void DAGTypeLegalizer::PromoteIntegerResult(SDNode *N, unsigned ResNo) {
  LLVM_DEBUG(dbgs() << "Promote integer result: "; N->dump(&DAG);
             dbgs() << "\n");
  SDValue Res = SDValue();

  // See if the target wants to custom expand this node.
  if (CustomLowerNode(N, N->getValueType(ResNo), true)) {
    LLVM_DEBUG(dbgs() << "Node has been custom expanded, done\n");
    return;
  }

  switch (N->getOpcode()) {
  default:
#ifndef NDEBUG
    dbgs() << "PromoteIntegerResult #" << ResNo << ": ";
    N->dump(&DAG); dbgs() << "\n";
#endif
    llvm_unreachable("Do not know how to promote this operator!");
  case ISD::MERGE_VALUES:Res = PromoteIntRes_MERGE_VALUES(N, ResNo); break;
  case ISD::AssertSext:  Res = PromoteIntRes_AssertSext(N); break;
  case ISD::AssertZext:  Res = PromoteIntRes_AssertZext(N); break;
  case ISD::BITCAST:     Res = PromoteIntRes_BITCAST(N); break;
  case ISD::BITREVERSE:  Res = PromoteIntRes_BITREVERSE(N); break;
  case ISD::BSWAP:       Res = PromoteIntRes_BSWAP(N); break;
  case ISD::BUILD_PAIR:  Res = PromoteIntRes_BUILD_PAIR(N); break;
  case ISD::Constant:    Res = PromoteIntRes_Constant(N); break;
  case ISD::CTLZ_ZERO_UNDEF:
  case ISD::CTLZ:        Res = PromoteIntRes_CTLZ(N); break;
  case ISD::CTPOP:       Res = PromoteIntRes_CTPOP(N); break;
  case ISD::CTTZ_ZERO_UNDEF:
  case ISD::CTTZ:        Res = PromoteIntRes_CTTZ(N); break;
  case ISD::EXTRACT_VECTOR_ELT:
                         Res = PromoteIntRes_EXTRACT_VECTOR_ELT(N); break;
  case ISD::LOAD:        Res = PromoteIntRes_LOAD(cast<LoadSDNode>(N)); break;
  case ISD::MLOAD:       Res = PromoteIntRes_MLOAD(cast<MaskedLoadSDNode>(N));
    break;
  case ISD::MGATHER:     Res = PromoteIntRes_MGATHER(cast<MaskedGatherSDNode>(N));
    break;
  case ISD::SELECT:      Res = PromoteIntRes_SELECT(N); break;
  case ISD::VSELECT:     Res = PromoteIntRes_VSELECT(N); break;
  case ISD::SELECT_CC:   Res = PromoteIntRes_SELECT_CC(N); break;
  case ISD::SETCC:       Res = PromoteIntRes_SETCC(N); break;
  case ISD::SMIN:
  case ISD::SMAX:        Res = PromoteIntRes_SExtIntBinOp(N); break;
  case ISD::UMIN:
  case ISD::UMAX:        Res = PromoteIntRes_ZExtIntBinOp(N); break;

  case ISD::SHL:         Res = PromoteIntRes_SHL(N); break;
  case ISD::SIGN_EXTEND_INREG:
                         Res = PromoteIntRes_SIGN_EXTEND_INREG(N); break;
  case ISD::SRA:         Res = PromoteIntRes_SRA(N); break;
  case ISD::SRL:         Res = PromoteIntRes_SRL(N); break;
  case ISD::TRUNCATE:    Res = PromoteIntRes_TRUNCATE(N); break;
  case ISD::UNDEF:       Res = PromoteIntRes_UNDEF(N); break;
  case ISD::VAARG:       Res = PromoteIntRes_VAARG(N); break;

  case ISD::EXTRACT_SUBVECTOR:
                         Res = PromoteIntRes_EXTRACT_SUBVECTOR(N); break;
  case ISD::VECTOR_SHUFFLE:
                         Res = PromoteIntRes_VECTOR_SHUFFLE(N); break;
  case ISD::INSERT_VECTOR_ELT:
                         Res = PromoteIntRes_INSERT_VECTOR_ELT(N); break;
  case ISD::BUILD_VECTOR:
                         Res = PromoteIntRes_BUILD_VECTOR(N); break;
  case ISD::SCALAR_TO_VECTOR:
                         Res = PromoteIntRes_SCALAR_TO_VECTOR(N); break;
  case ISD::SPLAT_VECTOR:
                         Res = PromoteIntRes_SPLAT_VECTOR(N); break;
  case ISD::CONCAT_VECTORS:
                         Res = PromoteIntRes_CONCAT_VECTORS(N); break;

  case ISD::ANY_EXTEND_VECTOR_INREG:
  case ISD::SIGN_EXTEND_VECTOR_INREG:
  case ISD::ZERO_EXTEND_VECTOR_INREG:
                         Res = PromoteIntRes_EXTEND_VECTOR_INREG(N); break;

  case ISD::SIGN_EXTEND:
  case ISD::ZERO_EXTEND:
  case ISD::ANY_EXTEND:  Res = PromoteIntRes_INT_EXTEND(N); break;

  case ISD::STRICT_FP_TO_SINT:
  case ISD::STRICT_FP_TO_UINT:
  case ISD::FP_TO_SINT:
  case ISD::FP_TO_UINT:  Res = PromoteIntRes_FP_TO_XINT(N); break;

  case ISD::FP_TO_FP16:  Res = PromoteIntRes_FP_TO_FP16(N); break;

  case ISD::FLT_ROUNDS_: Res = PromoteIntRes_FLT_ROUNDS(N); break;

  case ISD::AND:
  case ISD::OR:
  case ISD::XOR:
  case ISD::ADD:
  case ISD::SUB:
  case ISD::MUL:         Res = PromoteIntRes_SimpleIntBinOp(N); break;

  case ISD::SDIV:
  case ISD::SREM:        Res = PromoteIntRes_SExtIntBinOp(N); break;

  case ISD::UDIV:
  case ISD::UREM:        Res = PromoteIntRes_ZExtIntBinOp(N); break;

  case ISD::SADDO:
  case ISD::SSUBO:       Res = PromoteIntRes_SADDSUBO(N, ResNo); break;
  case ISD::UADDO:
  case ISD::USUBO:       Res = PromoteIntRes_UADDSUBO(N, ResNo); break;
  case ISD::SMULO:
  case ISD::UMULO:       Res = PromoteIntRes_XMULO(N, ResNo); break;

  case ISD::ADDE:
  case ISD::SUBE:
  case ISD::ADDCARRY:
  case ISD::SUBCARRY:    Res = PromoteIntRes_ADDSUBCARRY(N, ResNo); break;

  case ISD::SADDSAT:
  case ISD::UADDSAT:
  case ISD::SSUBSAT:
  case ISD::USUBSAT:     Res = PromoteIntRes_ADDSUBSAT(N); break;

  case ISD::SMULFIX:
  case ISD::SMULFIXSAT:
  case ISD::UMULFIX:
  case ISD::UMULFIXSAT:  Res = PromoteIntRes_MULFIX(N); break;

  case ISD::ABS:         Res = PromoteIntRes_ABS(N); break;

  case ISD::ATOMIC_LOAD:
    Res = PromoteIntRes_Atomic0(cast<AtomicSDNode>(N)); break;

  case ISD::ATOMIC_LOAD_ADD:
  case ISD::ATOMIC_LOAD_SUB:
  case ISD::ATOMIC_LOAD_AND:
  case ISD::ATOMIC_LOAD_CLR:
  case ISD::ATOMIC_LOAD_OR:
  case ISD::ATOMIC_LOAD_XOR:
  case ISD::ATOMIC_LOAD_NAND:
  case ISD::ATOMIC_LOAD_MIN:
  case ISD::ATOMIC_LOAD_MAX:
  case ISD::ATOMIC_LOAD_UMIN:
  case ISD::ATOMIC_LOAD_UMAX:
  case ISD::ATOMIC_SWAP:
    Res = PromoteIntRes_Atomic1(cast<AtomicSDNode>(N)); break;

  case ISD::ATOMIC_CMP_SWAP:
  case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
    Res = PromoteIntRes_AtomicCmpSwap(cast<AtomicSDNode>(N), ResNo);
    break;

  case ISD::VECREDUCE_ADD:
  case ISD::VECREDUCE_MUL:
  case ISD::VECREDUCE_AND:
  case ISD::VECREDUCE_OR:
  case ISD::VECREDUCE_XOR:
  case ISD::VECREDUCE_SMAX:
  case ISD::VECREDUCE_SMIN:
  case ISD::VECREDUCE_UMAX:
  case ISD::VECREDUCE_UMIN:
    Res = PromoteIntRes_VECREDUCE(N);
    break;
  }

  // If the result is null then the sub-method took care of registering it.
  if (Res.getNode())
    SetPromotedInteger(SDValue(N, ResNo), Res);
}

SDValue DAGTypeLegalizer::PromoteIntRes_MERGE_VALUES(SDNode *N,
                                                     unsigned ResNo) {
  SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
  return GetPromotedInteger(Op);
}

SDValue DAGTypeLegalizer::PromoteIntRes_AssertSext(SDNode *N) {
  // Sign-extend the new bits, and continue the assertion.
  SDValue Op = SExtPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::AssertSext, SDLoc(N),
                     Op.getValueType(), Op, N->getOperand(1));
}

SDValue DAGTypeLegalizer::PromoteIntRes_AssertZext(SDNode *N) {
  // Zero the new bits, and continue the assertion.
  SDValue Op = ZExtPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::AssertZext, SDLoc(N),
                     Op.getValueType(), Op, N->getOperand(1));
}

SDValue DAGTypeLegalizer::PromoteIntRes_Atomic0(AtomicSDNode *N) {
  EVT ResVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDValue Res = DAG.getAtomic(N->getOpcode(), SDLoc(N),
                              N->getMemoryVT(), ResVT,
                              N->getChain(), N->getBasePtr(),
                              N->getMemOperand());
  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_Atomic1(AtomicSDNode *N) {
  SDValue Op2 = GetPromotedInteger(N->getOperand(2));
  SDValue Res = DAG.getAtomic(N->getOpcode(), SDLoc(N),
                              N->getMemoryVT(),
                              N->getChain(), N->getBasePtr(),
                              Op2, N->getMemOperand());
  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_AtomicCmpSwap(AtomicSDNode *N,
                                                      unsigned ResNo) {
  if (ResNo == 1) {
    assert(N->getOpcode() == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
    EVT SVT = getSetCCResultType(N->getOperand(2).getValueType());
    EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(1));

    // Only use the result of getSetCCResultType if it is legal,
    // otherwise just use the promoted result type (NVT).
    if (!TLI.isTypeLegal(SVT))
      SVT = NVT;

    SDVTList VTs = DAG.getVTList(N->getValueType(0), SVT, MVT::Other);
    SDValue Res = DAG.getAtomicCmpSwap(
        ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, SDLoc(N), N->getMemoryVT(), VTs,
        N->getChain(), N->getBasePtr(), N->getOperand(2), N->getOperand(3),
        N->getMemOperand());
    ReplaceValueWith(SDValue(N, 0), Res.getValue(0));
    ReplaceValueWith(SDValue(N, 2), Res.getValue(2));
    return Res.getValue(1);
  }

  SDValue Op2 = GetPromotedInteger(N->getOperand(2));
  SDValue Op3 = GetPromotedInteger(N->getOperand(3));
  SDVTList VTs =
      DAG.getVTList(Op2.getValueType(), N->getValueType(1), MVT::Other);
  SDValue Res = DAG.getAtomicCmpSwap(
      N->getOpcode(), SDLoc(N), N->getMemoryVT(), VTs, N->getChain(),
      N->getBasePtr(), Op2, Op3, N->getMemOperand());
  // Update the use to N with the newly created Res.
  for (unsigned i = 1, NumResults = N->getNumValues(); i < NumResults; ++i)
    ReplaceValueWith(SDValue(N, i), Res.getValue(i));
  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_BITCAST(SDNode *N) {
  SDValue InOp = N->getOperand(0);
  EVT InVT = InOp.getValueType();
  EVT NInVT = TLI.getTypeToTransformTo(*DAG.getContext(), InVT);
  EVT OutVT = N->getValueType(0);
  EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT);
  SDLoc dl(N);

  switch (getTypeAction(InVT)) {
  case TargetLowering::TypeLegal:
    break;
  case TargetLowering::TypePromoteInteger:
    if (NOutVT.bitsEq(NInVT) && !NOutVT.isVector() && !NInVT.isVector())
      // The input promotes to the same size.  Convert the promoted value.
      return DAG.getNode(ISD::BITCAST, dl, NOutVT, GetPromotedInteger(InOp));
    break;
  case TargetLowering::TypeSoftenFloat:
    // Promote the integer operand by hand.
    return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT, GetSoftenedFloat(InOp));
  case TargetLowering::TypePromoteFloat: {
    // Convert the promoted float by hand.
    if (!NOutVT.isVector())
      return DAG.getNode(ISD::FP_TO_FP16, dl, NOutVT, GetPromotedFloat(InOp));
    break;
  }
  case TargetLowering::TypeExpandInteger:
  case TargetLowering::TypeExpandFloat:
    break;
  case TargetLowering::TypeScalarizeVector:
    // Convert the element to an integer and promote it by hand.
    if (!NOutVT.isVector())
      return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT,
                         BitConvertToInteger(GetScalarizedVector(InOp)));
    break;
  case TargetLowering::TypeSplitVector: {
    if (!NOutVT.isVector()) {
      // For example, i32 = BITCAST v2i16 on alpha.  Convert the split
      // pieces of the input into integers and reassemble in the final type.
      SDValue Lo, Hi;
      GetSplitVector(N->getOperand(0), Lo, Hi);
      Lo = BitConvertToInteger(Lo);
      Hi = BitConvertToInteger(Hi);

      if (DAG.getDataLayout().isBigEndian())
        std::swap(Lo, Hi);

      InOp = DAG.getNode(ISD::ANY_EXTEND, dl,
                         EVT::getIntegerVT(*DAG.getContext(),
                                           NOutVT.getSizeInBits()),
                         JoinIntegers(Lo, Hi));
      return DAG.getNode(ISD::BITCAST, dl, NOutVT, InOp);
    }
    break;
  }
  case TargetLowering::TypeWidenVector:
    // The input is widened to the same size. Convert to the widened value.
    // Make sure that the outgoing value is not a vector, because this would
    // make us bitcast between two vectors which are legalized in different ways.
    if (NOutVT.bitsEq(NInVT) && !NOutVT.isVector())
      return DAG.getNode(ISD::BITCAST, dl, NOutVT, GetWidenedVector(InOp));
    // If the output type is also a vector and widening it to the same size
    // as the widened input type would be a legal type, we can widen the bitcast
    // and handle the promotion after.
    if (NOutVT.isVector()) {
      unsigned WidenInSize = NInVT.getSizeInBits();
      unsigned OutSize = OutVT.getSizeInBits();
      if (WidenInSize % OutSize == 0) {
        unsigned Scale = WidenInSize / OutSize;
        EVT WideOutVT = EVT::getVectorVT(*DAG.getContext(),
                                         OutVT.getVectorElementType(),
                                         OutVT.getVectorNumElements() * Scale);
        if (isTypeLegal(WideOutVT)) {
          InOp = DAG.getBitcast(WideOutVT, GetWidenedVector(InOp));
          MVT IdxTy = TLI.getVectorIdxTy(DAG.getDataLayout());
          InOp = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, OutVT, InOp,
                             DAG.getConstant(0, dl, IdxTy));
          return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT, InOp);
        }
      }
    }
  }

  return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT,
                     CreateStackStoreLoad(InOp, OutVT));
}

// Helper for BSWAP/BITREVERSE promotion to ensure we can fit any shift amount
// in the VT returned by getShiftAmountTy and to return a safe VT if we can't.
static EVT getShiftAmountTyForConstant(EVT VT, const TargetLowering &TLI,
                                       SelectionDAG &DAG) {
  EVT ShiftVT = TLI.getShiftAmountTy(VT, DAG.getDataLayout());
  // If any possible shift value won't fit in the prefered type, just use
  // something safe. It will be legalized when the shift is expanded.
  if (!ShiftVT.isVector() &&
      ShiftVT.getSizeInBits() < Log2_32_Ceil(VT.getSizeInBits()))
    ShiftVT = MVT::i32;
  return ShiftVT;
}

SDValue DAGTypeLegalizer::PromoteIntRes_BSWAP(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  EVT OVT = N->getValueType(0);
  EVT NVT = Op.getValueType();
  SDLoc dl(N);

  unsigned DiffBits = NVT.getScalarSizeInBits() - OVT.getScalarSizeInBits();
  EVT ShiftVT = getShiftAmountTyForConstant(NVT, TLI, DAG);
  return DAG.getNode(ISD::SRL, dl, NVT, DAG.getNode(ISD::BSWAP, dl, NVT, Op),
                     DAG.getConstant(DiffBits, dl, ShiftVT));
}

SDValue DAGTypeLegalizer::PromoteIntRes_BITREVERSE(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  EVT OVT = N->getValueType(0);
  EVT NVT = Op.getValueType();
  SDLoc dl(N);

  unsigned DiffBits = NVT.getScalarSizeInBits() - OVT.getScalarSizeInBits();
  EVT ShiftVT = getShiftAmountTyForConstant(NVT, TLI, DAG);
  return DAG.getNode(ISD::SRL, dl, NVT,
                     DAG.getNode(ISD::BITREVERSE, dl, NVT, Op),
                     DAG.getConstant(DiffBits, dl, ShiftVT));
}

SDValue DAGTypeLegalizer::PromoteIntRes_BUILD_PAIR(SDNode *N) {
  // The pair element type may be legal, or may not promote to the same type as
  // the result, for example i14 = BUILD_PAIR (i7, i7).  Handle all cases.
  return DAG.getNode(ISD::ANY_EXTEND, SDLoc(N),
                     TLI.getTypeToTransformTo(*DAG.getContext(),
                     N->getValueType(0)), JoinIntegers(N->getOperand(0),
                     N->getOperand(1)));
}

SDValue DAGTypeLegalizer::PromoteIntRes_Constant(SDNode *N) {
  EVT VT = N->getValueType(0);
  // FIXME there is no actual debug info here
  SDLoc dl(N);
  // Zero extend things like i1, sign extend everything else.  It shouldn't
  // matter in theory which one we pick, but this tends to give better code?
  unsigned Opc = VT.isByteSized() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
  SDValue Result = DAG.getNode(Opc, dl,
                               TLI.getTypeToTransformTo(*DAG.getContext(), VT),
                               SDValue(N, 0));
  assert(isa<ConstantSDNode>(Result) && "Didn't constant fold ext?");
  return Result;
}

SDValue DAGTypeLegalizer::PromoteIntRes_CTLZ(SDNode *N) {
  // Zero extend to the promoted type and do the count there.
  SDValue Op = ZExtPromotedInteger(N->getOperand(0));
  SDLoc dl(N);
  EVT OVT = N->getValueType(0);
  EVT NVT = Op.getValueType();
  Op = DAG.getNode(N->getOpcode(), dl, NVT, Op);
  // Subtract off the extra leading bits in the bigger type.
  return DAG.getNode(
      ISD::SUB, dl, NVT, Op,
      DAG.getConstant(NVT.getScalarSizeInBits() - OVT.getScalarSizeInBits(), dl,
                      NVT));
}

SDValue DAGTypeLegalizer::PromoteIntRes_CTPOP(SDNode *N) {
  // Zero extend to the promoted type and do the count there.
  SDValue Op = ZExtPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::CTPOP, SDLoc(N), Op.getValueType(), Op);
}

SDValue DAGTypeLegalizer::PromoteIntRes_CTTZ(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  EVT OVT = N->getValueType(0);
  EVT NVT = Op.getValueType();
  SDLoc dl(N);
  if (N->getOpcode() == ISD::CTTZ) {
    // The count is the same in the promoted type except if the original
    // value was zero.  This can be handled by setting the bit just off
    // the top of the original type.
    auto TopBit = APInt::getOneBitSet(NVT.getScalarSizeInBits(),
                                      OVT.getScalarSizeInBits());
    Op = DAG.getNode(ISD::OR, dl, NVT, Op, DAG.getConstant(TopBit, dl, NVT));
  }
  return DAG.getNode(N->getOpcode(), dl, NVT, Op);
}

SDValue DAGTypeLegalizer::PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N) {
  SDLoc dl(N);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));

  SDValue Op0 = N->getOperand(0);
  SDValue Op1 = N->getOperand(1);

  // If the input also needs to be promoted, do that first so we can get a
  // get a good idea for the output type.
  if (TLI.getTypeAction(*DAG.getContext(), Op0.getValueType())
      == TargetLowering::TypePromoteInteger) {
    SDValue In = GetPromotedInteger(Op0);

    // If the new type is larger than NVT, use it. We probably won't need to
    // promote it again.
    EVT SVT = In.getValueType().getScalarType();
    if (SVT.bitsGE(NVT)) {
      SDValue Ext = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SVT, In, Op1);
      return DAG.getAnyExtOrTrunc(Ext, dl, NVT);
    }
  }

  return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NVT, Op0, Op1);
}

SDValue DAGTypeLegalizer::PromoteIntRes_FP_TO_XINT(SDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  unsigned NewOpc = N->getOpcode();
  SDLoc dl(N);

  // If we're promoting a UINT to a larger size and the larger FP_TO_UINT is
  // not Legal, check to see if we can use FP_TO_SINT instead.  (If both UINT
  // and SINT conversions are Custom, there is no way to tell which is
  // preferable. We choose SINT because that's the right thing on PPC.)
  if (N->getOpcode() == ISD::FP_TO_UINT &&
      !TLI.isOperationLegal(ISD::FP_TO_UINT, NVT) &&
      TLI.isOperationLegalOrCustom(ISD::FP_TO_SINT, NVT))
    NewOpc = ISD::FP_TO_SINT;

  if (N->getOpcode() == ISD::STRICT_FP_TO_UINT &&
      !TLI.isOperationLegal(ISD::STRICT_FP_TO_UINT, NVT) &&
      TLI.isOperationLegalOrCustom(ISD::STRICT_FP_TO_SINT, NVT))
    NewOpc = ISD::STRICT_FP_TO_SINT;

  SDValue Res;
  if (N->isStrictFPOpcode()) {
    Res = DAG.getNode(NewOpc, dl, { NVT, MVT::Other }, 
                      { N->getOperand(0), N->getOperand(1) });
    // Legalize the chain result - switch anything that used the old chain to
    // use the new one.
    ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  } else
    Res = DAG.getNode(NewOpc, dl, NVT, N->getOperand(0));

  // Assert that the converted value fits in the original type.  If it doesn't
  // (eg: because the value being converted is too big), then the result of the
  // original operation was undefined anyway, so the assert is still correct.
  //
  // NOTE: fp-to-uint to fp-to-sint promotion guarantees zero extend. For example:
  //   before legalization: fp-to-uint16, 65534. -> 0xfffe
  //   after legalization: fp-to-sint32, 65534. -> 0x0000fffe
  return DAG.getNode((N->getOpcode() == ISD::FP_TO_UINT ||
                      N->getOpcode() == ISD::STRICT_FP_TO_UINT) ?
                     ISD::AssertZext : ISD::AssertSext, dl, NVT, Res,
                     DAG.getValueType(N->getValueType(0).getScalarType()));
}

SDValue DAGTypeLegalizer::PromoteIntRes_FP_TO_FP16(SDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);

  return DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0));
}

SDValue DAGTypeLegalizer::PromoteIntRes_FLT_ROUNDS(SDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);

  return DAG.getNode(N->getOpcode(), dl, NVT);
}

SDValue DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(SDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);

  if (getTypeAction(N->getOperand(0).getValueType())
      == TargetLowering::TypePromoteInteger) {
    SDValue Res = GetPromotedInteger(N->getOperand(0));
    assert(Res.getValueType().bitsLE(NVT) && "Extension doesn't make sense!");

    // If the result and operand types are the same after promotion, simplify
    // to an in-register extension.
    if (NVT == Res.getValueType()) {
      // The high bits are not guaranteed to be anything.  Insert an extend.
      if (N->getOpcode() == ISD::SIGN_EXTEND)
        return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, NVT, Res,
                           DAG.getValueType(N->getOperand(0).getValueType()));
      if (N->getOpcode() == ISD::ZERO_EXTEND)
        return DAG.getZeroExtendInReg(Res, dl,
                      N->getOperand(0).getValueType().getScalarType());
      assert(N->getOpcode() == ISD::ANY_EXTEND && "Unknown integer extension!");
      return Res;
    }
  }

  // Otherwise, just extend the original operand all the way to the larger type.
  return DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0));
}

SDValue DAGTypeLegalizer::PromoteIntRes_LOAD(LoadSDNode *N) {
  assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  ISD::LoadExtType ExtType =
    ISD::isNON_EXTLoad(N) ? ISD::EXTLOAD : N->getExtensionType();
  SDLoc dl(N);
  SDValue Res = DAG.getExtLoad(ExtType, dl, NVT, N->getChain(), N->getBasePtr(),
                               N->getMemoryVT(), N->getMemOperand());

  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_MLOAD(MaskedLoadSDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDValue ExtPassThru = GetPromotedInteger(N->getPassThru());

  SDLoc dl(N);
  SDValue Res = DAG.getMaskedLoad(NVT, dl, N->getChain(), N->getBasePtr(),
                                  N->getMask(), ExtPassThru, N->getMemoryVT(),
                                  N->getMemOperand(), ISD::EXTLOAD);
  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_MGATHER(MaskedGatherSDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDValue ExtPassThru = GetPromotedInteger(N->getPassThru());
  assert(NVT == ExtPassThru.getValueType() &&
      "Gather result type and the passThru agrument type should be the same");

  SDLoc dl(N);
  SDValue Ops[] = {N->getChain(), ExtPassThru, N->getMask(), N->getBasePtr(),
                   N->getIndex(), N->getScale() };
  SDValue Res = DAG.getMaskedGather(DAG.getVTList(NVT, MVT::Other),
                                    N->getMemoryVT(), dl, Ops,
                                    N->getMemOperand(), N->getIndexType());
  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
  return Res;
}

/// Promote the overflow flag of an overflowing arithmetic node.
SDValue DAGTypeLegalizer::PromoteIntRes_Overflow(SDNode *N) {
  // Change the return type of the boolean result while obeying
  // getSetCCResultType.
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(1));
  EVT VT = N->getValueType(0);
  EVT SVT = getSetCCResultType(VT);
  SDValue Ops[3] = { N->getOperand(0), N->getOperand(1) };
  unsigned NumOps = N->getNumOperands();
  assert(NumOps <= 3 && "Too many operands");
  if (NumOps == 3)
    Ops[2] = N->getOperand(2);

  SDLoc dl(N);
  SDValue Res = DAG.getNode(N->getOpcode(), dl, DAG.getVTList(VT, SVT),
                            makeArrayRef(Ops, NumOps));

  // Modified the sum result - switch anything that used the old sum to use
  // the new one.
  ReplaceValueWith(SDValue(N, 0), Res);

  // Convert to the expected type.
  return DAG.getBoolExtOrTrunc(Res.getValue(1), dl, NVT, VT);
}

SDValue DAGTypeLegalizer::PromoteIntRes_ADDSUBSAT(SDNode *N) {
  // If the promoted type is legal, we can convert this to:
  //   1. ANY_EXTEND iN to iM
  //   2. SHL by M-N
  //   3. [US][ADD|SUB]SAT
  //   4. L/ASHR by M-N
  // Else it is more efficient to convert this to a min and a max
  // operation in the higher precision arithmetic.
  SDLoc dl(N);
  SDValue Op1 = N->getOperand(0);
  SDValue Op2 = N->getOperand(1);
  unsigned OldBits = Op1.getScalarValueSizeInBits();

  unsigned Opcode = N->getOpcode();

  SDValue Op1Promoted, Op2Promoted;
  if (Opcode == ISD::UADDSAT || Opcode == ISD::USUBSAT) {
    Op1Promoted = ZExtPromotedInteger(Op1);
    Op2Promoted = ZExtPromotedInteger(Op2);
  } else {
    Op1Promoted = SExtPromotedInteger(Op1);
    Op2Promoted = SExtPromotedInteger(Op2);
  }
  EVT PromotedType = Op1Promoted.getValueType();
  unsigned NewBits = PromotedType.getScalarSizeInBits();

  if (TLI.isOperationLegalOrCustom(Opcode, PromotedType)) {
    unsigned ShiftOp;
    switch (Opcode) {
    case ISD::SADDSAT:
    case ISD::SSUBSAT:
      ShiftOp = ISD::SRA;
      break;
    case ISD::UADDSAT:
    case ISD::USUBSAT:
      ShiftOp = ISD::SRL;
      break;
    default:
      llvm_unreachable("Expected opcode to be signed or unsigned saturation "
                       "addition or subtraction");
    }

    unsigned SHLAmount = NewBits - OldBits;
    EVT SHVT = TLI.getShiftAmountTy(PromotedType, DAG.getDataLayout());
    SDValue ShiftAmount = DAG.getConstant(SHLAmount, dl, SHVT);
    Op1Promoted =
        DAG.getNode(ISD::SHL, dl, PromotedType, Op1Promoted, ShiftAmount);
    Op2Promoted =
        DAG.getNode(ISD::SHL, dl, PromotedType, Op2Promoted, ShiftAmount);

    SDValue Result =
        DAG.getNode(Opcode, dl, PromotedType, Op1Promoted, Op2Promoted);
    return DAG.getNode(ShiftOp, dl, PromotedType, Result, ShiftAmount);
  } else {
    if (Opcode == ISD::USUBSAT) {
      SDValue Max =
          DAG.getNode(ISD::UMAX, dl, PromotedType, Op1Promoted, Op2Promoted);
      return DAG.getNode(ISD::SUB, dl, PromotedType, Max, Op2Promoted);
    }

    if (Opcode == ISD::UADDSAT) {
      APInt MaxVal = APInt::getAllOnesValue(OldBits).zext(NewBits);
      SDValue SatMax = DAG.getConstant(MaxVal, dl, PromotedType);
      SDValue Add =
          DAG.getNode(ISD::ADD, dl, PromotedType, Op1Promoted, Op2Promoted);
      return DAG.getNode(ISD::UMIN, dl, PromotedType, Add, SatMax);
    }

    unsigned AddOp = Opcode == ISD::SADDSAT ? ISD::ADD : ISD::SUB;
    APInt MinVal = APInt::getSignedMinValue(OldBits).sext(NewBits);
    APInt MaxVal = APInt::getSignedMaxValue(OldBits).sext(NewBits);
    SDValue SatMin = DAG.getConstant(MinVal, dl, PromotedType);
    SDValue SatMax = DAG.getConstant(MaxVal, dl, PromotedType);
    SDValue Result =
        DAG.getNode(AddOp, dl, PromotedType, Op1Promoted, Op2Promoted);
    Result = DAG.getNode(ISD::SMIN, dl, PromotedType, Result, SatMax);
    Result = DAG.getNode(ISD::SMAX, dl, PromotedType, Result, SatMin);
    return Result;
  }
}

SDValue DAGTypeLegalizer::PromoteIntRes_MULFIX(SDNode *N) {
  // Can just promote the operands then continue with operation.
  SDLoc dl(N);
  SDValue Op1Promoted, Op2Promoted;
  bool Signed =
      N->getOpcode() == ISD::SMULFIX || N->getOpcode() == ISD::SMULFIXSAT;
  bool Saturating =
      N->getOpcode() == ISD::SMULFIXSAT || N->getOpcode() == ISD::UMULFIXSAT;
  if (Signed) {
    Op1Promoted = SExtPromotedInteger(N->getOperand(0));
    Op2Promoted = SExtPromotedInteger(N->getOperand(1));
  } else {
    Op1Promoted = ZExtPromotedInteger(N->getOperand(0));
    Op2Promoted = ZExtPromotedInteger(N->getOperand(1));
  }
  EVT OldType = N->getOperand(0).getValueType();
  EVT PromotedType = Op1Promoted.getValueType();
  unsigned DiffSize =
      PromotedType.getScalarSizeInBits() - OldType.getScalarSizeInBits();

  if (Saturating) {
    // Promoting the operand and result values changes the saturation width,
    // which is extends the values that we clamp to on saturation. This could be
    // resolved by shifting one of the operands the same amount, which would
    // also shift the result we compare against, then shifting back.
    EVT ShiftTy = TLI.getShiftAmountTy(PromotedType, DAG.getDataLayout());
    Op1Promoted = DAG.getNode(ISD::SHL, dl, PromotedType, Op1Promoted,
                              DAG.getConstant(DiffSize, dl, ShiftTy));
    SDValue Result = DAG.getNode(N->getOpcode(), dl, PromotedType, Op1Promoted,
                                 Op2Promoted, N->getOperand(2));
    unsigned ShiftOp = Signed ? ISD::SRA : ISD::SRL;
    return DAG.getNode(ShiftOp, dl, PromotedType, Result,
                       DAG.getConstant(DiffSize, dl, ShiftTy));
  }
  return DAG.getNode(N->getOpcode(), dl, PromotedType, Op1Promoted, Op2Promoted,
                     N->getOperand(2));
}

SDValue DAGTypeLegalizer::PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo) {
  if (ResNo == 1)
    return PromoteIntRes_Overflow(N);

  // The operation overflowed iff the result in the larger type is not the
  // sign extension of its truncation to the original type.
  SDValue LHS = SExtPromotedInteger(N->getOperand(0));
  SDValue RHS = SExtPromotedInteger(N->getOperand(1));
  EVT OVT = N->getOperand(0).getValueType();
  EVT NVT = LHS.getValueType();
  SDLoc dl(N);

  // Do the arithmetic in the larger type.
  unsigned Opcode = N->getOpcode() == ISD::SADDO ? ISD::ADD : ISD::SUB;
  SDValue Res = DAG.getNode(Opcode, dl, NVT, LHS, RHS);

  // Calculate the overflow flag: sign extend the arithmetic result from
  // the original type.
  SDValue Ofl = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, NVT, Res,
                            DAG.getValueType(OVT));
  // Overflowed if and only if this is not equal to Res.
  Ofl = DAG.getSetCC(dl, N->getValueType(1), Ofl, Res, ISD::SETNE);

  // Use the calculated overflow everywhere.
  ReplaceValueWith(SDValue(N, 1), Ofl);

  return Res;
}

SDValue DAGTypeLegalizer::PromoteIntRes_SELECT(SDNode *N) {
  SDValue LHS = GetPromotedInteger(N->getOperand(1));
  SDValue RHS = GetPromotedInteger(N->getOperand(2));
  return DAG.getSelect(SDLoc(N),
                       LHS.getValueType(), N->getOperand(0), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_VSELECT(SDNode *N) {
  SDValue Mask = N->getOperand(0);

  SDValue LHS = GetPromotedInteger(N->getOperand(1));
  SDValue RHS = GetPromotedInteger(N->getOperand(2));
  return DAG.getNode(ISD::VSELECT, SDLoc(N),
                     LHS.getValueType(), Mask, LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SELECT_CC(SDNode *N) {
  SDValue LHS = GetPromotedInteger(N->getOperand(2));
  SDValue RHS = GetPromotedInteger(N->getOperand(3));
  return DAG.getNode(ISD::SELECT_CC, SDLoc(N),
                     LHS.getValueType(), N->getOperand(0),
                     N->getOperand(1), LHS, RHS, N->getOperand(4));
}

SDValue DAGTypeLegalizer::PromoteIntRes_SETCC(SDNode *N) {
  EVT InVT = N->getOperand(0).getValueType();
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));

  EVT SVT = getSetCCResultType(InVT);

  // If we got back a type that needs to be promoted, this likely means the
  // the input type also needs to be promoted. So get the promoted type for
  // the input and try the query again.
  if (getTypeAction(SVT) == TargetLowering::TypePromoteInteger) {
    if (getTypeAction(InVT) == TargetLowering::TypePromoteInteger) {
      InVT = TLI.getTypeToTransformTo(*DAG.getContext(), InVT);
      SVT = getSetCCResultType(InVT);
    } else {
      // Input type isn't promoted, just use the default promoted type.
      SVT = NVT;
    }
  }

  SDLoc dl(N);
  assert(SVT.isVector() == N->getOperand(0).getValueType().isVector() &&
         "Vector compare must return a vector result!");

  // Get the SETCC result using the canonical SETCC type.
  SDValue SetCC = DAG.getNode(N->getOpcode(), dl, SVT, N->getOperand(0),
                              N->getOperand(1), N->getOperand(2));

  // Convert to the expected type.
  return DAG.getSExtOrTrunc(SetCC, dl, NVT);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SHL(SDNode *N) {
  SDValue LHS = GetPromotedInteger(N->getOperand(0));
  SDValue RHS = N->getOperand(1);
  if (getTypeAction(RHS.getValueType()) == TargetLowering::TypePromoteInteger)
    RHS = ZExtPromotedInteger(RHS);
  return DAG.getNode(ISD::SHL, SDLoc(N), LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::SIGN_EXTEND_INREG, SDLoc(N),
                     Op.getValueType(), Op, N->getOperand(1));
}

SDValue DAGTypeLegalizer::PromoteIntRes_SimpleIntBinOp(SDNode *N) {
  // The input may have strange things in the top bits of the registers, but
  // these operations don't care.  They may have weird bits going out, but
  // that too is okay if they are integer operations.
  SDValue LHS = GetPromotedInteger(N->getOperand(0));
  SDValue RHS = GetPromotedInteger(N->getOperand(1));
  return DAG.getNode(N->getOpcode(), SDLoc(N),
                     LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SExtIntBinOp(SDNode *N) {
  // Sign extend the input.
  SDValue LHS = SExtPromotedInteger(N->getOperand(0));
  SDValue RHS = SExtPromotedInteger(N->getOperand(1));
  return DAG.getNode(N->getOpcode(), SDLoc(N),
                     LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_ZExtIntBinOp(SDNode *N) {
  // Zero extend the input.
  SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
  SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
  return DAG.getNode(N->getOpcode(), SDLoc(N),
                     LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SRA(SDNode *N) {
  // The input value must be properly sign extended.
  SDValue LHS = SExtPromotedInteger(N->getOperand(0));
  SDValue RHS = N->getOperand(1);
  if (getTypeAction(RHS.getValueType()) == TargetLowering::TypePromoteInteger)
    RHS = ZExtPromotedInteger(RHS);
  return DAG.getNode(ISD::SRA, SDLoc(N), LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_SRL(SDNode *N) {
  // The input value must be properly zero extended.
  SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
  SDValue RHS = N->getOperand(1);
  if (getTypeAction(RHS.getValueType()) == TargetLowering::TypePromoteInteger)
    RHS = ZExtPromotedInteger(RHS);
  return DAG.getNode(ISD::SRL, SDLoc(N), LHS.getValueType(), LHS, RHS);
}

SDValue DAGTypeLegalizer::PromoteIntRes_TRUNCATE(SDNode *N) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDValue Res;
  SDValue InOp = N->getOperand(0);
  SDLoc dl(N);

  switch (getTypeAction(InOp.getValueType())) {
  default: llvm_unreachable("Unknown type action!");
  case TargetLowering::TypeLegal:
  case TargetLowering::TypeExpandInteger:
    Res = InOp;
    break;
  case TargetLowering::TypePromoteInteger:
    Res = GetPromotedInteger(InOp);
    break;
  case TargetLowering::TypeSplitVector: {
    EVT InVT = InOp.getValueType();
    assert(InVT.isVector() && "Cannot split scalar types");
    unsigned NumElts = InVT.getVectorNumElements();
    assert(NumElts == NVT.getVectorNumElements() &&
           "Dst and Src must have the same number of elements");
    assert(isPowerOf2_32(NumElts) &&
           "Promoted vector type must be a power of two");

    SDValue EOp1, EOp2;
    GetSplitVector(InOp, EOp1, EOp2);

    EVT HalfNVT = EVT::getVectorVT(*DAG.getContext(), NVT.getScalarType(),
                                   NumElts/2);
    EOp1 = DAG.getNode(ISD::TRUNCATE, dl, HalfNVT, EOp1);
    EOp2 = DAG.getNode(ISD::TRUNCATE, dl, HalfNVT, EOp2);

    return DAG.getNode(ISD::CONCAT_VECTORS, dl, NVT, EOp1, EOp2);
  }
  case TargetLowering::TypeWidenVector: {
    SDValue WideInOp = GetWidenedVector(InOp);

    // Truncate widened InOp.
    unsigned NumElem = WideInOp.getValueType().getVectorNumElements();
    EVT TruncVT = EVT::getVectorVT(*DAG.getContext(),
                                   N->getValueType(0).getScalarType(), NumElem);
    SDValue WideTrunc = DAG.getNode(ISD::TRUNCATE, dl, TruncVT, WideInOp);

    // Zero extend so that the elements are of same type as those of NVT
    EVT ExtVT = EVT::getVectorVT(*DAG.getContext(), NVT.getVectorElementType(),
                                 NumElem);
    SDValue WideExt = DAG.getNode(ISD::ZERO_EXTEND, dl, ExtVT, WideTrunc);

    // Extract the low NVT subvector.
    MVT IdxTy = TLI.getVectorIdxTy(DAG.getDataLayout());
    SDValue ZeroIdx = DAG.getConstant(0, dl, IdxTy);
    return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, NVT, WideExt, ZeroIdx);
  }
  }

  // Truncate to NVT instead of VT
  return DAG.getNode(ISD::TRUNCATE, dl, NVT, Res);
}

SDValue DAGTypeLegalizer::PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo) {
  if (ResNo == 1)
    return PromoteIntRes_Overflow(N);

  // The operation overflowed iff the result in the larger type is not the
  // zero extension of its truncation to the original type.
  SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
  SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
  EVT OVT = N->getOperand(0).getValueType();
  EVT NVT = LHS.getValueType();
  SDLoc dl(N);

  // Do the arithmetic in the larger type.
  unsigned Opcode = N->getOpcode() == ISD::UADDO ? ISD::ADD : ISD::SUB;
  SDValue Res = DAG.getNode(Opcode, dl, NVT, LHS, RHS);

  // Calculate the overflow flag: zero extend the arithmetic result from
  // the original type.
  SDValue Ofl = DAG.getZeroExtendInReg(Res, dl, OVT.getScalarType());
  // Overflowed if and only if this is not equal to Res.
  Ofl = DAG.getSetCC(dl, N->getValueType(1), Ofl, Res, ISD::SETNE);

  // Use the calculated overflow everywhere.
  ReplaceValueWith(SDValue(N, 1), Ofl);

  return Res;
}

// Handle promotion for the ADDE/SUBE/ADDCARRY/SUBCARRY nodes. Notice that
// the third operand of ADDE/SUBE nodes is carry flag, which differs from 
// the ADDCARRY/SUBCARRY nodes in that the third operand is carry Boolean.
SDValue DAGTypeLegalizer::PromoteIntRes_ADDSUBCARRY(SDNode *N, unsigned ResNo) {
  if (ResNo == 1)
    return PromoteIntRes_Overflow(N);

  // We need to sign-extend the operands so the carry value computed by the
  // wide operation will be equivalent to the carry value computed by the
  // narrow operation.
  // An ADDCARRY can generate carry only if any of the operands has its
  // most significant bit set. Sign extension propagates the most significant
  // bit into the higher bits which means the extra bit that the narrow
  // addition would need (i.e. the carry) will be propagated through the higher
  // bits of the wide addition.
  // A SUBCARRY can generate borrow only if LHS < RHS and this property will be
  // preserved by sign extension.
  SDValue LHS = SExtPromotedInteger(N->getOperand(0));
  SDValue RHS = SExtPromotedInteger(N->getOperand(1));

  EVT ValueVTs[] = {LHS.getValueType(), N->getValueType(1)};

  // Do the arithmetic in the wide type.
  SDValue Res = DAG.getNode(N->getOpcode(), SDLoc(N), DAG.getVTList(ValueVTs),
                            LHS, RHS, N->getOperand(2));

  // Update the users of the original carry/borrow value.
  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));

  return SDValue(Res.getNode(), 0);
}

SDValue DAGTypeLegalizer::PromoteIntRes_ABS(SDNode *N) {
  SDValue Op0 = SExtPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::ABS, SDLoc(N), Op0.getValueType(), Op0);
}

SDValue DAGTypeLegalizer::PromoteIntRes_XMULO(SDNode *N, unsigned ResNo) {
  // Promote the overflow bit trivially.
  if (ResNo == 1)
    return PromoteIntRes_Overflow(N);

  SDValue LHS = N->getOperand(0), RHS = N->getOperand(1);
  SDLoc DL(N);
  EVT SmallVT = LHS.getValueType();

  // To determine if the result overflowed in a larger type, we extend the
  // input to the larger type, do the multiply (checking if it overflows),
  // then also check the high bits of the result to see if overflow happened
  // there.
  if (N->getOpcode() == ISD::SMULO) {
    LHS = SExtPromotedInteger(LHS);
    RHS = SExtPromotedInteger(RHS);
  } else {
    LHS = ZExtPromotedInteger(LHS);
    RHS = ZExtPromotedInteger(RHS);
  }
  SDVTList VTs = DAG.getVTList(LHS.getValueType(), N->getValueType(1));
  SDValue Mul = DAG.getNode(N->getOpcode(), DL, VTs, LHS, RHS);

  // Overflow occurred if it occurred in the larger type, or if the high part
  // of the result does not zero/sign-extend the low part.  Check this second
  // possibility first.
  SDValue Overflow;
  if (N->getOpcode() == ISD::UMULO) {
    // Unsigned overflow occurred if the high part is non-zero.
    unsigned Shift = SmallVT.getScalarSizeInBits();
    EVT ShiftTy = getShiftAmountTyForConstant(Mul.getValueType(), TLI, DAG);
    SDValue Hi = DAG.getNode(ISD::SRL, DL, Mul.getValueType(), Mul,
                             DAG.getConstant(Shift, DL, ShiftTy));
    Overflow = DAG.getSetCC(DL, N->getValueType(1), Hi,
                            DAG.getConstant(0, DL, Hi.getValueType()),
                            ISD::SETNE);
  } else {
    // Signed overflow occurred if the high part does not sign extend the low.
    SDValue SExt = DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, Mul.getValueType(),
                               Mul, DAG.getValueType(SmallVT));
    Overflow = DAG.getSetCC(DL, N->getValueType(1), SExt, Mul, ISD::SETNE);
  }

  // The only other way for overflow to occur is if the multiplication in the
  // larger type itself overflowed.
  Overflow = DAG.getNode(ISD::OR, DL, N->getValueType(1), Overflow,
                         SDValue(Mul.getNode(), 1));

  // Use the calculated overflow everywhere.
  ReplaceValueWith(SDValue(N, 1), Overflow);
  return Mul;
}

SDValue DAGTypeLegalizer::PromoteIntRes_UNDEF(SDNode *N) {
  return DAG.getUNDEF(TLI.getTypeToTransformTo(*DAG.getContext(),
                                               N->getValueType(0)));
}

SDValue DAGTypeLegalizer::PromoteIntRes_VAARG(SDNode *N) {
  SDValue Chain = N->getOperand(0); // Get the chain.
  SDValue Ptr = N->getOperand(1); // Get the pointer.
  EVT VT = N->getValueType(0);
  SDLoc dl(N);

  MVT RegVT = TLI.getRegisterType(*DAG.getContext(), VT);
  unsigned NumRegs = TLI.getNumRegisters(*DAG.getContext(), VT);
  // The argument is passed as NumRegs registers of type RegVT.

  SmallVector<SDValue, 8> Parts(NumRegs);
  for (unsigned i = 0; i < NumRegs; ++i) {
    Parts[i] = DAG.getVAArg(RegVT, dl, Chain, Ptr, N->getOperand(2),
                            N->getConstantOperandVal(3));
    Chain = Parts[i].getValue(1);
  }

  // Handle endianness of the load.
  if (DAG.getDataLayout().isBigEndian())
    std::reverse(Parts.begin(), Parts.end());

  // Assemble the parts in the promoted type.
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDValue Res = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Parts[0]);
  for (unsigned i = 1; i < NumRegs; ++i) {
    SDValue Part = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Parts[i]);
    // Shift it to the right position and "or" it in.
    Part = DAG.getNode(ISD::SHL, dl, NVT, Part,
                       DAG.getConstant(i * RegVT.getSizeInBits(), dl,
                                       TLI.getPointerTy(DAG.getDataLayout())));
    Res = DAG.getNode(ISD::OR, dl, NVT, Res, Part);
  }

  // Modified the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Chain);

  return Res;
}

//===----------------------------------------------------------------------===//
//  Integer Operand Promotion
//===----------------------------------------------------------------------===//

/// PromoteIntegerOperand - This method is called when the specified operand of
/// the specified node is found to need promotion.  At this point, all of the
/// result types of the node are known to be legal, but other operands of the
/// node may need promotion or expansion as well as the specified one.
bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
  LLVM_DEBUG(dbgs() << "Promote integer operand: "; N->dump(&DAG);
             dbgs() << "\n");
  SDValue Res = SDValue();

  if (CustomLowerNode(N, N->getOperand(OpNo).getValueType(), false)) {
    LLVM_DEBUG(dbgs() << "Node has been custom lowered, done\n");
    return false;
  }

  switch (N->getOpcode()) {
    default:
  #ifndef NDEBUG
    dbgs() << "PromoteIntegerOperand Op #" << OpNo << ": ";
    N->dump(&DAG); dbgs() << "\n";
  #endif
    llvm_unreachable("Do not know how to promote this operator's operand!");

  case ISD::ANY_EXTEND:   Res = PromoteIntOp_ANY_EXTEND(N); break;
  case ISD::ATOMIC_STORE:
    Res = PromoteIntOp_ATOMIC_STORE(cast<AtomicSDNode>(N));
    break;
  case ISD::BITCAST:      Res = PromoteIntOp_BITCAST(N); break;
  case ISD::BR_CC:        Res = PromoteIntOp_BR_CC(N, OpNo); break;
  case ISD::BRCOND:       Res = PromoteIntOp_BRCOND(N, OpNo); break;
  case ISD::BUILD_PAIR:   Res = PromoteIntOp_BUILD_PAIR(N); break;
  case ISD::BUILD_VECTOR: Res = PromoteIntOp_BUILD_VECTOR(N); break;
  case ISD::CONCAT_VECTORS: Res = PromoteIntOp_CONCAT_VECTORS(N); break;
  case ISD::EXTRACT_VECTOR_ELT: Res = PromoteIntOp_EXTRACT_VECTOR_ELT(N); break;
  case ISD::INSERT_VECTOR_ELT:
                          Res = PromoteIntOp_INSERT_VECTOR_ELT(N, OpNo);break;
  case ISD::SCALAR_TO_VECTOR:
                          Res = PromoteIntOp_SCALAR_TO_VECTOR(N); break;
  case ISD::SPLAT_VECTOR:
                          Res = PromoteIntOp_SPLAT_VECTOR(N); break;
  case ISD::VSELECT:
  case ISD::SELECT:       Res = PromoteIntOp_SELECT(N, OpNo); break;
  case ISD::SELECT_CC:    Res = PromoteIntOp_SELECT_CC(N, OpNo); break;
  case ISD::SETCC:        Res = PromoteIntOp_SETCC(N, OpNo); break;
  case ISD::SIGN_EXTEND:  Res = PromoteIntOp_SIGN_EXTEND(N); break;
  case ISD::SINT_TO_FP:   Res = PromoteIntOp_SINT_TO_FP(N); break;
  case ISD::STORE:        Res = PromoteIntOp_STORE(cast<StoreSDNode>(N),
                                                   OpNo); break;
  case ISD::MSTORE:       Res = PromoteIntOp_MSTORE(cast<MaskedStoreSDNode>(N),
                                                    OpNo); break;
  case ISD::MLOAD:        Res = PromoteIntOp_MLOAD(cast<MaskedLoadSDNode>(N),
                                                    OpNo); break;
  case ISD::MGATHER:  Res = PromoteIntOp_MGATHER(cast<MaskedGatherSDNode>(N),
                                                 OpNo); break;
  case ISD::MSCATTER: Res = PromoteIntOp_MSCATTER(cast<MaskedScatterSDNode>(N),
                                                  OpNo); break;
  case ISD::TRUNCATE:     Res = PromoteIntOp_TRUNCATE(N); break;
  case ISD::FP16_TO_FP:
  case ISD::UINT_TO_FP:   Res = PromoteIntOp_UINT_TO_FP(N); break;
  case ISD::ZERO_EXTEND:  Res = PromoteIntOp_ZERO_EXTEND(N); break;
  case ISD::EXTRACT_SUBVECTOR: Res = PromoteIntOp_EXTRACT_SUBVECTOR(N); break;

  case ISD::SHL:
  case ISD::SRA:
  case ISD::SRL:
  case ISD::ROTL:
  case ISD::ROTR: Res = PromoteIntOp_Shift(N); break;

  case ISD::ADDCARRY:
  case ISD::SUBCARRY: Res = PromoteIntOp_ADDSUBCARRY(N, OpNo); break;

  case ISD::FRAMEADDR:
  case ISD::RETURNADDR: Res = PromoteIntOp_FRAMERETURNADDR(N); break;

  case ISD::PREFETCH: Res = PromoteIntOp_PREFETCH(N, OpNo); break;

  case ISD::SMULFIX:
  case ISD::SMULFIXSAT:
  case ISD::UMULFIX:
  case ISD::UMULFIXSAT: Res = PromoteIntOp_MULFIX(N); break;

  case ISD::FPOWI: Res = PromoteIntOp_FPOWI(N); break;

  case ISD::VECREDUCE_ADD:
  case ISD::VECREDUCE_MUL:
  case ISD::VECREDUCE_AND:
  case ISD::VECREDUCE_OR:
  case ISD::VECREDUCE_XOR:
  case ISD::VECREDUCE_SMAX:
  case ISD::VECREDUCE_SMIN:
  case ISD::VECREDUCE_UMAX:
  case ISD::VECREDUCE_UMIN: Res = PromoteIntOp_VECREDUCE(N); break;
  }

  // If the result is null, the sub-method took care of registering results etc.
  if (!Res.getNode()) return false;

  // If the result is N, the sub-method updated N in place.  Tell the legalizer
  // core about this.
  if (Res.getNode() == N)
    return true;

  assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
         "Invalid operand expansion");

  ReplaceValueWith(SDValue(N, 0), Res);
  return false;
}

/// PromoteSetCCOperands - Promote the operands of a comparison.  This code is
/// shared among BR_CC, SELECT_CC, and SETCC handlers.
void DAGTypeLegalizer::PromoteSetCCOperands(SDValue &NewLHS,SDValue &NewRHS,
                                            ISD::CondCode CCCode) {
  // We have to insert explicit sign or zero extends. Note that we could
  // insert sign extends for ALL conditions. For those operations where either
  // zero or sign extension would be valid, use SExtOrZExtPromotedInteger
  // which will choose the cheapest for the target.
  switch (CCCode) {
  default: llvm_unreachable("Unknown integer comparison!");
  case ISD::SETEQ:
  case ISD::SETNE: {
    SDValue OpL = GetPromotedInteger(NewLHS);
    SDValue OpR = GetPromotedInteger(NewRHS);

    // We would prefer to promote the comparison operand with sign extension.
    // If the width of OpL/OpR excluding the duplicated sign bits is no greater
    // than the width of NewLHS/NewRH, we can avoid inserting real truncate
    // instruction, which is redundant eventually.
    unsigned OpLEffectiveBits =
        OpL.getScalarValueSizeInBits() - DAG.ComputeNumSignBits(OpL) + 1;
    unsigned OpREffectiveBits =
        OpR.getScalarValueSizeInBits() - DAG.ComputeNumSignBits(OpR) + 1;
    if (OpLEffectiveBits <= NewLHS.getScalarValueSizeInBits() &&
        OpREffectiveBits <= NewRHS.getScalarValueSizeInBits()) {
      NewLHS = OpL;
      NewRHS = OpR;
    } else {
      NewLHS = SExtOrZExtPromotedInteger(NewLHS);
      NewRHS = SExtOrZExtPromotedInteger(NewRHS);
    }
    break;
  }
  case ISD::SETUGE:
  case ISD::SETUGT:
  case ISD::SETULE:
  case ISD::SETULT:
    NewLHS = SExtOrZExtPromotedInteger(NewLHS);
    NewRHS = SExtOrZExtPromotedInteger(NewRHS);
    break;
  case ISD::SETGE:
  case ISD::SETGT:
  case ISD::SETLT:
  case ISD::SETLE:
    NewLHS = SExtPromotedInteger(NewLHS);
    NewRHS = SExtPromotedInteger(NewRHS);
    break;
  }
}

SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::ANY_EXTEND, SDLoc(N), N->getValueType(0), Op);
}

SDValue DAGTypeLegalizer::PromoteIntOp_ATOMIC_STORE(AtomicSDNode *N) {
  SDValue Op2 = GetPromotedInteger(N->getOperand(2));
  return DAG.getAtomic(N->getOpcode(), SDLoc(N), N->getMemoryVT(),
                       N->getChain(), N->getBasePtr(), Op2, N->getMemOperand());
}

SDValue DAGTypeLegalizer::PromoteIntOp_BITCAST(SDNode *N) {
  // This should only occur in unusual situations like bitcasting to an
  // x86_fp80, so just turn it into a store+load
  return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
}

SDValue DAGTypeLegalizer::PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo) {
  assert(OpNo == 2 && "Don't know how to promote this operand!");

  SDValue LHS = N->getOperand(2);
  SDValue RHS = N->getOperand(3);
  PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(1))->get());

  // The chain (Op#0), CC (#1) and basic block destination (Op#4) are always
  // legal types.
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
                                N->getOperand(1), LHS, RHS, N->getOperand(4)),
                 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo) {
  assert(OpNo == 1 && "only know how to promote condition");

  // Promote all the way up to the canonical SetCC type.
  SDValue Cond = PromoteTargetBoolean(N->getOperand(1), MVT::Other);

  // The chain (Op#0) and basic block destination (Op#2) are always legal types.
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0), Cond,
                                        N->getOperand(2)), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_PAIR(SDNode *N) {
  // Since the result type is legal, the operands must promote to it.
  EVT OVT = N->getOperand(0).getValueType();
  SDValue Lo = ZExtPromotedInteger(N->getOperand(0));
  SDValue Hi = GetPromotedInteger(N->getOperand(1));
  assert(Lo.getValueType() == N->getValueType(0) && "Operand over promoted?");
  SDLoc dl(N);

  Hi = DAG.getNode(ISD::SHL, dl, N->getValueType(0), Hi,
                   DAG.getConstant(OVT.getSizeInBits(), dl,
                                   TLI.getPointerTy(DAG.getDataLayout())));
  return DAG.getNode(ISD::OR, dl, N->getValueType(0), Lo, Hi);
}

SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_VECTOR(SDNode *N) {
  // The vector type is legal but the element type is not.  This implies
  // that the vector is a power-of-two in length and that the element
  // type does not have a strange size (eg: it is not i1).
  EVT VecVT = N->getValueType(0);
  unsigned NumElts = VecVT.getVectorNumElements();
  assert(!((NumElts & 1) && (!TLI.isTypeLegal(VecVT))) &&
         "Legal vector of one illegal element?");

  // Promote the inserted value.  The type does not need to match the
  // vector element type.  Check that any extra bits introduced will be
  // truncated away.
  assert(N->getOperand(0).getValueSizeInBits() >=
         N->getValueType(0).getScalarSizeInBits() &&
         "Type of inserted value narrower than vector element type!");

  SmallVector<SDValue, 16> NewOps;
  for (unsigned i = 0; i < NumElts; ++i)
    NewOps.push_back(GetPromotedInteger(N->getOperand(i)));

  return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N,
                                                         unsigned OpNo) {
  if (OpNo == 1) {
    // Promote the inserted value.  This is valid because the type does not
    // have to match the vector element type.

    // Check that any extra bits introduced will be truncated away.
    assert(N->getOperand(1).getValueSizeInBits() >=
           N->getValueType(0).getScalarSizeInBits() &&
           "Type of inserted value narrower than vector element type!");
    return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
                                  GetPromotedInteger(N->getOperand(1)),
                                  N->getOperand(2)),
                   0);
  }

  assert(OpNo == 2 && "Different operand and result vector types?");

  // Promote the index.
  SDValue Idx = DAG.getZExtOrTrunc(N->getOperand(2), SDLoc(N),
                                   TLI.getVectorIdxTy(DAG.getDataLayout()));
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
                                N->getOperand(1), Idx), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N) {
  // Integer SCALAR_TO_VECTOR operands are implicitly truncated, so just promote
  // the operand in place.
  return SDValue(DAG.UpdateNodeOperands(N,
                                GetPromotedInteger(N->getOperand(0))), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SPLAT_VECTOR(SDNode *N) {
  // Integer SPLAT_VECTOR operands are implicitly truncated, so just promote the
  // operand in place.
  return SDValue(
      DAG.UpdateNodeOperands(N, GetPromotedInteger(N->getOperand(0))), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SELECT(SDNode *N, unsigned OpNo) {
  assert(OpNo == 0 && "Only know how to promote the condition!");
  SDValue Cond = N->getOperand(0);
  EVT OpTy = N->getOperand(1).getValueType();

  if (N->getOpcode() == ISD::VSELECT)
    if (SDValue Res = WidenVSELECTAndMask(N))
      return Res;

  // Promote all the way up to the canonical SetCC type.
  EVT OpVT = N->getOpcode() == ISD::SELECT ? OpTy.getScalarType() : OpTy;
  Cond = PromoteTargetBoolean(Cond, OpVT);

  return SDValue(DAG.UpdateNodeOperands(N, Cond, N->getOperand(1),
                                        N->getOperand(2)), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo) {
  assert(OpNo == 0 && "Don't know how to promote this operand!");

  SDValue LHS = N->getOperand(0);
  SDValue RHS = N->getOperand(1);
  PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(4))->get());

  // The CC (#4) and the possible return values (#2 and #3) have legal types.
  return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2),
                                N->getOperand(3), N->getOperand(4)), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SETCC(SDNode *N, unsigned OpNo) {
  assert(OpNo == 0 && "Don't know how to promote this operand!");

  SDValue LHS = N->getOperand(0);
  SDValue RHS = N->getOperand(1);
  PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(2))->get());

  // The CC (#2) is always legal.
  return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2)), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_Shift(SDNode *N) {
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
                                ZExtPromotedInteger(N->getOperand(1))), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_SIGN_EXTEND(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  SDLoc dl(N);
  Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
  return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(),
                     Op, DAG.getValueType(N->getOperand(0).getValueType()));
}

SDValue DAGTypeLegalizer::PromoteIntOp_SINT_TO_FP(SDNode *N) {
  return SDValue(DAG.UpdateNodeOperands(N,
                                SExtPromotedInteger(N->getOperand(0))), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo){
  assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
  SDValue Ch = N->getChain(), Ptr = N->getBasePtr();
  SDLoc dl(N);

  SDValue Val = GetPromotedInteger(N->getValue());  // Get promoted value.

  // Truncate the value and store the result.
  return DAG.getTruncStore(Ch, dl, Val, Ptr,
                           N->getMemoryVT(), N->getMemOperand());
}

SDValue DAGTypeLegalizer::PromoteIntOp_MSTORE(MaskedStoreSDNode *N,
                                              unsigned OpNo) {

  SDValue DataOp = N->getValue();
  EVT DataVT = DataOp.getValueType();
  SDValue Mask = N->getMask();
  SDLoc dl(N);

  bool TruncateStore = false;
  if (OpNo == 3) {
    Mask = PromoteTargetBoolean(Mask, DataVT);
    // Update in place.
    SmallVector<SDValue, 4> NewOps(N->op_begin(), N->op_end());
    NewOps[3] = Mask;
    return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
  } else { // Data operand
    assert(OpNo == 1 && "Unexpected operand for promotion");
    DataOp = GetPromotedInteger(DataOp);
    TruncateStore = true;
  }

  return DAG.getMaskedStore(N->getChain(), dl, DataOp, N->getBasePtr(), Mask,
                            N->getMemoryVT(), N->getMemOperand(),
                            TruncateStore, N->isCompressingStore());
}

SDValue DAGTypeLegalizer::PromoteIntOp_MLOAD(MaskedLoadSDNode *N,
                                             unsigned OpNo) {
  assert(OpNo == 2 && "Only know how to promote the mask!");
  EVT DataVT = N->getValueType(0);
  SDValue Mask = PromoteTargetBoolean(N->getOperand(OpNo), DataVT);
  SmallVector<SDValue, 4> NewOps(N->op_begin(), N->op_end());
  NewOps[OpNo] = Mask;
  return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_MGATHER(MaskedGatherSDNode *N,
                                               unsigned OpNo) {

  SmallVector<SDValue, 5> NewOps(N->op_begin(), N->op_end());
  if (OpNo == 2) {
    // The Mask
    EVT DataVT = N->getValueType(0);
    NewOps[OpNo] = PromoteTargetBoolean(N->getOperand(OpNo), DataVT);
  } else if (OpNo == 4) {
    // The Index
    if (N->isIndexSigned())
      // Need to sign extend the index since the bits will likely be used.
      NewOps[OpNo] = SExtPromotedInteger(N->getOperand(OpNo));
    else
      NewOps[OpNo] = ZExtPromotedInteger(N->getOperand(OpNo));
  } else
    NewOps[OpNo] = GetPromotedInteger(N->getOperand(OpNo));

  return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_MSCATTER(MaskedScatterSDNode *N,
                                                unsigned OpNo) {
  SmallVector<SDValue, 5> NewOps(N->op_begin(), N->op_end());
  if (OpNo == 2) {
    // The Mask
    EVT DataVT = N->getValue().getValueType();
    NewOps[OpNo] = PromoteTargetBoolean(N->getOperand(OpNo), DataVT);
  } else if (OpNo == 4) {
    // The Index
    if (N->isIndexSigned())
      // Need to sign extend the index since the bits will likely be used.
      NewOps[OpNo] = SExtPromotedInteger(N->getOperand(OpNo));
    else
      NewOps[OpNo] = ZExtPromotedInteger(N->getOperand(OpNo));
  } else
    NewOps[OpNo] = GetPromotedInteger(N->getOperand(OpNo));
  return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_TRUNCATE(SDNode *N) {
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  return DAG.getNode(ISD::TRUNCATE, SDLoc(N), N->getValueType(0), Op);
}

SDValue DAGTypeLegalizer::PromoteIntOp_UINT_TO_FP(SDNode *N) {
  return SDValue(DAG.UpdateNodeOperands(N,
                                ZExtPromotedInteger(N->getOperand(0))), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_ZERO_EXTEND(SDNode *N) {
  SDLoc dl(N);
  SDValue Op = GetPromotedInteger(N->getOperand(0));
  Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
  return DAG.getZeroExtendInReg(Op, dl,
                                N->getOperand(0).getValueType().getScalarType());
}

SDValue DAGTypeLegalizer::PromoteIntOp_ADDSUBCARRY(SDNode *N, unsigned OpNo) {
  assert(OpNo == 2 && "Don't know how to promote this operand!");

  SDValue LHS = N->getOperand(0);
  SDValue RHS = N->getOperand(1);
  SDValue Carry = N->getOperand(2);
  SDLoc DL(N);

  Carry = PromoteTargetBoolean(Carry, LHS.getValueType());

  return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, Carry), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_MULFIX(SDNode *N) {
  SDValue Op2 = ZExtPromotedInteger(N->getOperand(2));
  return SDValue(
      DAG.UpdateNodeOperands(N, N->getOperand(0), N->getOperand(1), Op2), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_FRAMERETURNADDR(SDNode *N) {
  // Promote the RETURNADDR/FRAMEADDR argument to a supported integer width.
  SDValue Op = ZExtPromotedInteger(N->getOperand(0));
  return SDValue(DAG.UpdateNodeOperands(N, Op), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_PREFETCH(SDNode *N, unsigned OpNo) {
  assert(OpNo > 1 && "Don't know how to promote this operand!");
  // Promote the rw, locality, and cache type arguments to a supported integer
  // width.
  SDValue Op2 = ZExtPromotedInteger(N->getOperand(2));
  SDValue Op3 = ZExtPromotedInteger(N->getOperand(3));
  SDValue Op4 = ZExtPromotedInteger(N->getOperand(4));
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0), N->getOperand(1),
                                        Op2, Op3, Op4),
                 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_FPOWI(SDNode *N) {
  SDValue Op = SExtPromotedInteger(N->getOperand(1));
  return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0), Op), 0);
}

SDValue DAGTypeLegalizer::PromoteIntOp_VECREDUCE(SDNode *N) {
  SDLoc dl(N);
  SDValue Op;
  switch (N->getOpcode()) {
  default: llvm_unreachable("Expected integer vector reduction");
  case ISD::VECREDUCE_ADD:
  case ISD::VECREDUCE_MUL:
  case ISD::VECREDUCE_AND:
  case ISD::VECREDUCE_OR:
  case ISD::VECREDUCE_XOR:
    Op = GetPromotedInteger(N->getOperand(0));
    break;
  case ISD::VECREDUCE_SMAX:
  case ISD::VECREDUCE_SMIN:
    Op = SExtPromotedInteger(N->getOperand(0));
    break;
  case ISD::VECREDUCE_UMAX:
  case ISD::VECREDUCE_UMIN:
    Op = ZExtPromotedInteger(N->getOperand(0));
    break;
  }

  EVT EltVT = Op.getValueType().getVectorElementType();
  EVT VT = N->getValueType(0);
  if (VT.bitsGE(EltVT))
    return DAG.getNode(N->getOpcode(), SDLoc(N), VT, Op);

  // Result size must be >= element size. If this is not the case after
  // promotion, also promote the result type and then truncate.
  SDValue Reduce = DAG.getNode(N->getOpcode(), dl, EltVT, Op);
  return DAG.getNode(ISD::TRUNCATE, dl, VT, Reduce);
}

//===----------------------------------------------------------------------===//
//  Integer Result Expansion
//===----------------------------------------------------------------------===//

/// ExpandIntegerResult - This method is called when the specified result of the
/// specified node is found to need expansion.  At this point, the node may also
/// have invalid operands or may have other results that need promotion, we just
/// know that (at least) one result needs expansion.
void DAGTypeLegalizer::ExpandIntegerResult(SDNode *N, unsigned ResNo) {
  LLVM_DEBUG(dbgs() << "Expand integer result: "; N->dump(&DAG);
             dbgs() << "\n");
  SDValue Lo, Hi;
  Lo = Hi = SDValue();

  // See if the target wants to custom expand this node.
  if (CustomLowerNode(N, N->getValueType(ResNo), true))
    return;

  switch (N->getOpcode()) {
  default:
#ifndef NDEBUG
    dbgs() << "ExpandIntegerResult #" << ResNo << ": ";
    N->dump(&DAG); dbgs() << "\n";
#endif
    report_fatal_error("Do not know how to expand the result of this "
                       "operator!");

  case ISD::MERGE_VALUES: SplitRes_MERGE_VALUES(N, ResNo, Lo, Hi); break;
  case ISD::SELECT:       SplitRes_SELECT(N, Lo, Hi); break;
  case ISD::SELECT_CC:    SplitRes_SELECT_CC(N, Lo, Hi); break;
  case ISD::UNDEF:        SplitRes_UNDEF(N, Lo, Hi); break;

  case ISD::BITCAST:            ExpandRes_BITCAST(N, Lo, Hi); break;
  case ISD::BUILD_PAIR:         ExpandRes_BUILD_PAIR(N, Lo, Hi); break;
  case ISD::EXTRACT_ELEMENT:    ExpandRes_EXTRACT_ELEMENT(N, Lo, Hi); break;
  case ISD::EXTRACT_VECTOR_ELT: ExpandRes_EXTRACT_VECTOR_ELT(N, Lo, Hi); break;
  case ISD::VAARG:              ExpandRes_VAARG(N, Lo, Hi); break;

  case ISD::ANY_EXTEND:  ExpandIntRes_ANY_EXTEND(N, Lo, Hi); break;
  case ISD::AssertSext:  ExpandIntRes_AssertSext(N, Lo, Hi); break;
  case ISD::AssertZext:  ExpandIntRes_AssertZext(N, Lo, Hi); break;
  case ISD::BITREVERSE:  ExpandIntRes_BITREVERSE(N, Lo, Hi); break;
  case ISD::BSWAP:       ExpandIntRes_BSWAP(N, Lo, Hi); break;
  case ISD::Constant:    ExpandIntRes_Constant(N, Lo, Hi); break;
  case ISD::ABS:         ExpandIntRes_ABS(N, Lo, Hi); break;
  case ISD::CTLZ_ZERO_UNDEF:
  case ISD::CTLZ:        ExpandIntRes_CTLZ(N, Lo, Hi); break;
  case ISD::CTPOP:       ExpandIntRes_CTPOP(N, Lo, Hi); break;
  case ISD::CTTZ_ZERO_UNDEF:
  case ISD::CTTZ:        ExpandIntRes_CTTZ(N, Lo, Hi); break;
  case ISD::FLT_ROUNDS_: ExpandIntRes_FLT_ROUNDS(N, Lo, Hi); break;
  case ISD::FP_TO_SINT:  ExpandIntRes_FP_TO_SINT(N, Lo, Hi); break;
  case ISD::FP_TO_UINT:  ExpandIntRes_FP_TO_UINT(N, Lo, Hi); break;
  case ISD::LLROUND:     ExpandIntRes_LLROUND(N, Lo, Hi); break;
  case ISD::LLRINT:      ExpandIntRes_LLRINT(N, Lo, Hi); break;
  case ISD::LOAD:        ExpandIntRes_LOAD(cast<LoadSDNode>(N), Lo, Hi); break;
  case ISD::MUL:         ExpandIntRes_MUL(N, Lo, Hi); break;
  case ISD::READCYCLECOUNTER: ExpandIntRes_READCYCLECOUNTER(N, Lo, Hi); break;
  case ISD::SDIV:        ExpandIntRes_SDIV(N, Lo, Hi); break;
  case ISD::SIGN_EXTEND: ExpandIntRes_SIGN_EXTEND(N, Lo, Hi); break;
  case ISD::SIGN_EXTEND_INREG: ExpandIntRes_SIGN_EXTEND_INREG(N, Lo, Hi); break;
  case ISD::SREM:        ExpandIntRes_SREM(N, Lo, Hi); break;
  case ISD::TRUNCATE:    ExpandIntRes_TRUNCATE(N, Lo, Hi); break;
  case ISD::UDIV:        ExpandIntRes_UDIV(N, Lo, Hi); break;
  case ISD::UREM:        ExpandIntRes_UREM(N, Lo, Hi); break;
  case ISD::ZERO_EXTEND: ExpandIntRes_ZERO_EXTEND(N, Lo, Hi); break;
  case ISD::ATOMIC_LOAD: ExpandIntRes_ATOMIC_LOAD(N, Lo, Hi); break;

  case ISD::ATOMIC_LOAD_ADD:
  case ISD::ATOMIC_LOAD_SUB:
  case ISD::ATOMIC_LOAD_AND:
  case ISD::ATOMIC_LOAD_CLR:
  case ISD::ATOMIC_LOAD_OR:
  case ISD::ATOMIC_LOAD_XOR:
  case ISD::ATOMIC_LOAD_NAND:
  case ISD::ATOMIC_LOAD_MIN:
  case ISD::ATOMIC_LOAD_MAX:
  case ISD::ATOMIC_LOAD_UMIN:
  case ISD::ATOMIC_LOAD_UMAX:
  case ISD::ATOMIC_SWAP:
  case ISD::ATOMIC_CMP_SWAP: {
    std::pair<SDValue, SDValue> Tmp = ExpandAtomic(N);
    SplitInteger(Tmp.first, Lo, Hi);
    ReplaceValueWith(SDValue(N, 1), Tmp.second);
    break;
  }
  case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS: {
    AtomicSDNode *AN = cast<AtomicSDNode>(N);
    SDVTList VTs = DAG.getVTList(N->getValueType(0), MVT::Other);
    SDValue Tmp = DAG.getAtomicCmpSwap(
        ISD::ATOMIC_CMP_SWAP, SDLoc(N), AN->getMemoryVT(), VTs,
        N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3),
        AN->getMemOperand());

    // Expanding to the strong ATOMIC_CMP_SWAP node means we can determine
    // success simply by comparing the loaded value against the ingoing
    // comparison.
    SDValue Success = DAG.getSetCC(SDLoc(N), N->getValueType(1), Tmp,
                                   N->getOperand(2), ISD::SETEQ);

    SplitInteger(Tmp, Lo, Hi);
    ReplaceValueWith(SDValue(N, 1), Success);
    ReplaceValueWith(SDValue(N, 2), Tmp.getValue(1));
    break;
  }

  case ISD::AND:
  case ISD::OR:
  case ISD::XOR: ExpandIntRes_Logical(N, Lo, Hi); break;

  case ISD::UMAX:
  case ISD::SMAX:
  case ISD::UMIN:
  case ISD::SMIN: ExpandIntRes_MINMAX(N, Lo, Hi); break;

  case ISD::ADD:
  case ISD::SUB: ExpandIntRes_ADDSUB(N, Lo, Hi); break;

  case ISD::ADDC:
  case ISD::SUBC: ExpandIntRes_ADDSUBC(N, Lo, Hi); break;

  case ISD::ADDE:
  case ISD::SUBE: ExpandIntRes_ADDSUBE(N, Lo, Hi); break;

  case ISD::ADDCARRY:
  case ISD::SUBCARRY: ExpandIntRes_ADDSUBCARRY(N, Lo, Hi); break;

  case ISD::SHL:
  case ISD::SRA:
  case ISD::SRL: ExpandIntRes_Shift(N, Lo, Hi); break;

  case ISD::SADDO:
  case ISD::SSUBO: ExpandIntRes_SADDSUBO(N, Lo, Hi); break;
  case ISD::UADDO:
  case ISD::USUBO: ExpandIntRes_UADDSUBO(N, Lo, Hi); break;
  case ISD::UMULO:
  case ISD::SMULO: ExpandIntRes_XMULO(N, Lo, Hi); break;

  case ISD::SADDSAT:
  case ISD::UADDSAT:
  case ISD::SSUBSAT:
  case ISD::USUBSAT: ExpandIntRes_ADDSUBSAT(N, Lo, Hi); break;

  case ISD::SMULFIX:
  case ISD::SMULFIXSAT:
  case ISD::UMULFIX:
  case ISD::UMULFIXSAT: ExpandIntRes_MULFIX(N, Lo, Hi); break;

  case ISD::VECREDUCE_ADD:
  case ISD::VECREDUCE_MUL:
  case ISD::VECREDUCE_AND:
  case ISD::VECREDUCE_OR:
  case ISD::VECREDUCE_XOR:
  case ISD::VECREDUCE_SMAX:
  case ISD::VECREDUCE_SMIN:
  case ISD::VECREDUCE_UMAX:
  case ISD::VECREDUCE_UMIN: ExpandIntRes_VECREDUCE(N, Lo, Hi); break;
  }

  // If Lo/Hi is null, the sub-method took care of registering results etc.
  if (Lo.getNode())
    SetExpandedInteger(SDValue(N, ResNo), Lo, Hi);
}

/// Lower an atomic node to the appropriate builtin call.
std::pair <SDValue, SDValue> DAGTypeLegalizer::ExpandAtomic(SDNode *Node) {
  unsigned Opc = Node->getOpcode();
  MVT VT = cast<AtomicSDNode>(Node)->getMemoryVT().getSimpleVT();
  RTLIB::Libcall LC = RTLIB::getSYNC(Opc, VT);
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected atomic op or value type!");

  return ExpandChainLibCall(LC, Node, false);
}

/// N is a shift by a value that needs to be expanded,
/// and the shift amount is a constant 'Amt'.  Expand the operation.
void DAGTypeLegalizer::ExpandShiftByConstant(SDNode *N, const APInt &Amt,
                                             SDValue &Lo, SDValue &Hi) {
  SDLoc DL(N);
  // Expand the incoming operand to be shifted, so that we have its parts
  SDValue InL, InH;
  GetExpandedInteger(N->getOperand(0), InL, InH);

  // Though Amt shouldn't usually be 0, it's possible. E.g. when legalization
  // splitted a vector shift, like this: <op1, op2> SHL <0, 2>.
  if (!Amt) {
    Lo = InL;
    Hi = InH;
    return;
  }

  EVT NVT = InL.getValueType();
  unsigned VTBits = N->getValueType(0).getSizeInBits();
  unsigned NVTBits = NVT.getSizeInBits();
  EVT ShTy = N->getOperand(1).getValueType();

  if (N->getOpcode() == ISD::SHL) {
    if (Amt.ugt(VTBits)) {
      Lo = Hi = DAG.getConstant(0, DL, NVT);
    } else if (Amt.ugt(NVTBits)) {
      Lo = DAG.getConstant(0, DL, NVT);
      Hi = DAG.getNode(ISD::SHL, DL,
                       NVT, InL, DAG.getConstant(Amt - NVTBits, DL, ShTy));
    } else if (Amt == NVTBits) {
      Lo = DAG.getConstant(0, DL, NVT);
      Hi = InL;
    } else {
      Lo = DAG.getNode(ISD::SHL, DL, NVT, InL, DAG.getConstant(Amt, DL, ShTy));
      Hi = DAG.getNode(ISD::OR, DL, NVT,
                       DAG.getNode(ISD::SHL, DL, NVT, InH,
                                   DAG.getConstant(Amt, DL, ShTy)),
                       DAG.getNode(ISD::SRL, DL, NVT, InL,
                                   DAG.getConstant(-Amt + NVTBits, DL, ShTy)));
    }
    return;
  }

  if (N->getOpcode() == ISD::SRL) {
    if (Amt.ugt(VTBits)) {
      Lo = Hi = DAG.getConstant(0, DL, NVT);
    } else if (Amt.ugt(NVTBits)) {
      Lo = DAG.getNode(ISD::SRL, DL,
                       NVT, InH, DAG.getConstant(Amt - NVTBits, DL, ShTy));
      Hi = DAG.getConstant(0, DL, NVT);
    } else if (Amt == NVTBits) {
      Lo = InH;
      Hi = DAG.getConstant(0, DL, NVT);
    } else {
      Lo = DAG.getNode(ISD::OR, DL, NVT,
                       DAG.getNode(ISD::SRL, DL, NVT, InL,
                                   DAG.getConstant(Amt, DL, ShTy)),
                       DAG.getNode(ISD::SHL, DL, NVT, InH,
                                   DAG.getConstant(-Amt + NVTBits, DL, ShTy)));
      Hi = DAG.getNode(ISD::SRL, DL, NVT, InH, DAG.getConstant(Amt, DL, ShTy));
    }
    return;
  }

  assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
  if (Amt.ugt(VTBits)) {
    Hi = Lo = DAG.getNode(ISD::SRA, DL, NVT, InH,
                          DAG.getConstant(NVTBits - 1, DL, ShTy));
  } else if (Amt.ugt(NVTBits)) {
    Lo = DAG.getNode(ISD::SRA, DL, NVT, InH,
                     DAG.getConstant(Amt - NVTBits, DL, ShTy));
    Hi = DAG.getNode(ISD::SRA, DL, NVT, InH,
                     DAG.getConstant(NVTBits - 1, DL, ShTy));
  } else if (Amt == NVTBits) {
    Lo = InH;
    Hi = DAG.getNode(ISD::SRA, DL, NVT, InH,
                     DAG.getConstant(NVTBits - 1, DL, ShTy));
  } else {
    Lo = DAG.getNode(ISD::OR, DL, NVT,
                     DAG.getNode(ISD::SRL, DL, NVT, InL,
                                 DAG.getConstant(Amt, DL, ShTy)),
                     DAG.getNode(ISD::SHL, DL, NVT, InH,
                                 DAG.getConstant(-Amt + NVTBits, DL, ShTy)));
    Hi = DAG.getNode(ISD::SRA, DL, NVT, InH, DAG.getConstant(Amt, DL, ShTy));
  }
}

/// ExpandShiftWithKnownAmountBit - Try to determine whether we can simplify
/// this shift based on knowledge of the high bit of the shift amount.  If we
/// can tell this, we know that it is >= 32 or < 32, without knowing the actual
/// shift amount.
bool DAGTypeLegalizer::
ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi) {
  SDValue Amt = N->getOperand(1);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  EVT ShTy = Amt.getValueType();
  unsigned ShBits = ShTy.getScalarSizeInBits();
  unsigned NVTBits = NVT.getScalarSizeInBits();
  assert(isPowerOf2_32(NVTBits) &&
         "Expanded integer type size not a power of two!");
  SDLoc dl(N);

  APInt HighBitMask = APInt::getHighBitsSet(ShBits, ShBits - Log2_32(NVTBits));
  KnownBits Known = DAG.computeKnownBits(N->getOperand(1));

  // If we don't know anything about the high bits, exit.
  if (((Known.Zero|Known.One) & HighBitMask) == 0)
    return false;

  // Get the incoming operand to be shifted.
  SDValue InL, InH;
  GetExpandedInteger(N->getOperand(0), InL, InH);

  // If we know that any of the high bits of the shift amount are one, then we
  // can do this as a couple of simple shifts.
  if (Known.One.intersects(HighBitMask)) {
    // Mask out the high bit, which we know is set.
    Amt = DAG.getNode(ISD::AND, dl, ShTy, Amt,
                      DAG.getConstant(~HighBitMask, dl, ShTy));

    switch (N->getOpcode()) {
    default: llvm_unreachable("Unknown shift");
    case ISD::SHL:
      Lo = DAG.getConstant(0, dl, NVT);              // Low part is zero.
      Hi = DAG.getNode(ISD::SHL, dl, NVT, InL, Amt); // High part from Lo part.
      return true;
    case ISD::SRL:
      Hi = DAG.getConstant(0, dl, NVT);              // Hi part is zero.
      Lo = DAG.getNode(ISD::SRL, dl, NVT, InH, Amt); // Lo part from Hi part.
      return true;
    case ISD::SRA:
      Hi = DAG.getNode(ISD::SRA, dl, NVT, InH,       // Sign extend high part.
                       DAG.getConstant(NVTBits - 1, dl, ShTy));
      Lo = DAG.getNode(ISD::SRA, dl, NVT, InH, Amt); // Lo part from Hi part.
      return true;
    }
  }

  // If we know that all of the high bits of the shift amount are zero, then we
  // can do this as a couple of simple shifts.
  if (HighBitMask.isSubsetOf(Known.Zero)) {
    // Calculate 31-x. 31 is used instead of 32 to avoid creating an undefined
    // shift if x is zero.  We can use XOR here because x is known to be smaller
    // than 32.
    SDValue Amt2 = DAG.getNode(ISD::XOR, dl, ShTy, Amt,
                               DAG.getConstant(NVTBits - 1, dl, ShTy));

    unsigned Op1, Op2;
    switch (N->getOpcode()) {
    default: llvm_unreachable("Unknown shift");
    case ISD::SHL:  Op1 = ISD::SHL; Op2 = ISD::SRL; break;
    case ISD::SRL:
    case ISD::SRA:  Op1 = ISD::SRL; Op2 = ISD::SHL; break;
    }

    // When shifting right the arithmetic for Lo and Hi is swapped.
    if (N->getOpcode() != ISD::SHL)
      std::swap(InL, InH);

    // Use a little trick to get the bits that move from Lo to Hi. First
    // shift by one bit.
    SDValue Sh1 = DAG.getNode(Op2, dl, NVT, InL, DAG.getConstant(1, dl, ShTy));
    // Then compute the remaining shift with amount-1.
    SDValue Sh2 = DAG.getNode(Op2, dl, NVT, Sh1, Amt2);

    Lo = DAG.getNode(N->getOpcode(), dl, NVT, InL, Amt);
    Hi = DAG.getNode(ISD::OR, dl, NVT, DAG.getNode(Op1, dl, NVT, InH, Amt),Sh2);

    if (N->getOpcode() != ISD::SHL)
      std::swap(Hi, Lo);
    return true;
  }

  return false;
}

/// ExpandShiftWithUnknownAmountBit - Fully general expansion of integer shift
/// of any size.
bool DAGTypeLegalizer::
ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi) {
  SDValue Amt = N->getOperand(1);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  EVT ShTy = Amt.getValueType();
  unsigned NVTBits = NVT.getSizeInBits();
  assert(isPowerOf2_32(NVTBits) &&
         "Expanded integer type size not a power of two!");
  SDLoc dl(N);

  // Get the incoming operand to be shifted.
  SDValue InL, InH;
  GetExpandedInteger(N->getOperand(0), InL, InH);

  SDValue NVBitsNode = DAG.getConstant(NVTBits, dl, ShTy);
  SDValue AmtExcess = DAG.getNode(ISD::SUB, dl, ShTy, Amt, NVBitsNode);
  SDValue AmtLack = DAG.getNode(ISD::SUB, dl, ShTy, NVBitsNode, Amt);
  SDValue isShort = DAG.getSetCC(dl, getSetCCResultType(ShTy),
                                 Amt, NVBitsNode, ISD::SETULT);
  SDValue isZero = DAG.getSetCC(dl, getSetCCResultType(ShTy),
                                Amt, DAG.getConstant(0, dl, ShTy),
                                ISD::SETEQ);

  SDValue LoS, HiS, LoL, HiL;
  switch (N->getOpcode()) {
  default: llvm_unreachable("Unknown shift");
  case ISD::SHL:
    // Short: ShAmt < NVTBits
    LoS = DAG.getNode(ISD::SHL, dl, NVT, InL, Amt);
    HiS = DAG.getNode(ISD::OR, dl, NVT,
                      DAG.getNode(ISD::SHL, dl, NVT, InH, Amt),
                      DAG.getNode(ISD::SRL, dl, NVT, InL, AmtLack));

    // Long: ShAmt >= NVTBits
    LoL = DAG.getConstant(0, dl, NVT);                    // Lo part is zero.
    HiL = DAG.getNode(ISD::SHL, dl, NVT, InL, AmtExcess); // Hi from Lo part.

    Lo = DAG.getSelect(dl, NVT, isShort, LoS, LoL);
    Hi = DAG.getSelect(dl, NVT, isZero, InH,
                       DAG.getSelect(dl, NVT, isShort, HiS, HiL));
    return true;
  case ISD::SRL:
    // Short: ShAmt < NVTBits
    HiS = DAG.getNode(ISD::SRL, dl, NVT, InH, Amt);
    LoS = DAG.getNode(ISD::OR, dl, NVT,
                      DAG.getNode(ISD::SRL, dl, NVT, InL, Amt),
    // FIXME: If Amt is zero, the following shift generates an undefined result
    // on some architectures.
                      DAG.getNode(ISD::SHL, dl, NVT, InH, AmtLack));

    // Long: ShAmt >= NVTBits
    HiL = DAG.getConstant(0, dl, NVT);                    // Hi part is zero.
    LoL = DAG.getNode(ISD::SRL, dl, NVT, InH, AmtExcess); // Lo from Hi part.

    Lo = DAG.getSelect(dl, NVT, isZero, InL,
                       DAG.getSelect(dl, NVT, isShort, LoS, LoL));
    Hi = DAG.getSelect(dl, NVT, isShort, HiS, HiL);
    return true;
  case ISD::SRA:
    // Short: ShAmt < NVTBits
    HiS = DAG.getNode(ISD::SRA, dl, NVT, InH, Amt);
    LoS = DAG.getNode(ISD::OR, dl, NVT,
                      DAG.getNode(ISD::SRL, dl, NVT, InL, Amt),
                      DAG.getNode(ISD::SHL, dl, NVT, InH, AmtLack));

    // Long: ShAmt >= NVTBits
    HiL = DAG.getNode(ISD::SRA, dl, NVT, InH,             // Sign of Hi part.
                      DAG.getConstant(NVTBits - 1, dl, ShTy));
    LoL = DAG.getNode(ISD::SRA, dl, NVT, InH, AmtExcess); // Lo from Hi part.

    Lo = DAG.getSelect(dl, NVT, isZero, InL,
                       DAG.getSelect(dl, NVT, isShort, LoS, LoL));
    Hi = DAG.getSelect(dl, NVT, isShort, HiS, HiL);
    return true;
  }
}

static std::pair<ISD::CondCode, ISD::NodeType> getExpandedMinMaxOps(int Op) {

  switch (Op) {
    default: llvm_unreachable("invalid min/max opcode");
    case ISD::SMAX:
      return std::make_pair(ISD::SETGT, ISD::UMAX);
    case ISD::UMAX:
      return std::make_pair(ISD::SETUGT, ISD::UMAX);
    case ISD::SMIN:
      return std::make_pair(ISD::SETLT, ISD::UMIN);
    case ISD::UMIN:
      return std::make_pair(ISD::SETULT, ISD::UMIN);
  }
}

void DAGTypeLegalizer::ExpandIntRes_MINMAX(SDNode *N,
                                           SDValue &Lo, SDValue &Hi) {
  SDLoc DL(N);
  ISD::NodeType LoOpc;
  ISD::CondCode CondC;
  std::tie(CondC, LoOpc) = getExpandedMinMaxOps(N->getOpcode());

  // Expand the subcomponents.
  SDValue LHSL, LHSH, RHSL, RHSH;
  GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
  GetExpandedInteger(N->getOperand(1), RHSL, RHSH);

  // Value types
  EVT NVT = LHSL.getValueType();
  EVT CCT = getSetCCResultType(NVT);

  // Hi part is always the same op
  Hi = DAG.getNode(N->getOpcode(), DL, NVT, {LHSH, RHSH});

  // We need to know whether to select Lo part that corresponds to 'winning'
  // Hi part or if Hi parts are equal.
  SDValue IsHiLeft = DAG.getSetCC(DL, CCT, LHSH, RHSH, CondC);
  SDValue IsHiEq = DAG.getSetCC(DL, CCT, LHSH, RHSH, ISD::SETEQ);

  // Lo part corresponding to the 'winning' Hi part
  SDValue LoCmp = DAG.getSelect(DL, NVT, IsHiLeft, LHSL, RHSL);

  // Recursed Lo part if Hi parts are equal, this uses unsigned version
  SDValue LoMinMax = DAG.getNode(LoOpc, DL, NVT, {LHSL, RHSL});

  Lo = DAG.getSelect(DL, NVT, IsHiEq, LoMinMax, LoCmp);
}

void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
                                           SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  // Expand the subcomponents.
  SDValue LHSL, LHSH, RHSL, RHSH;
  GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
  GetExpandedInteger(N->getOperand(1), RHSL, RHSH);

  EVT NVT = LHSL.getValueType();
  SDValue LoOps[2] = { LHSL, RHSL };
  SDValue HiOps[3] = { LHSH, RHSH };

  bool HasOpCarry = TLI.isOperationLegalOrCustom(
      N->getOpcode() == ISD::ADD ? ISD::ADDCARRY : ISD::SUBCARRY,
      TLI.getTypeToExpandTo(*DAG.getContext(), NVT));
  if (HasOpCarry) {
    SDVTList VTList = DAG.getVTList(NVT, getSetCCResultType(NVT));
    if (N->getOpcode() == ISD::ADD) {
      Lo = DAG.getNode(ISD::UADDO, dl, VTList, LoOps);
      HiOps[2] = Lo.getValue(1);
      Hi = DAG.getNode(ISD::ADDCARRY, dl, VTList, HiOps);
    } else {
      Lo = DAG.getNode(ISD::USUBO, dl, VTList, LoOps);
      HiOps[2] = Lo.getValue(1);
      Hi = DAG.getNode(ISD::SUBCARRY, dl, VTList, HiOps);
    }
    return;
  }

  // Do not generate ADDC/ADDE or SUBC/SUBE if the target does not support
  // them.  TODO: Teach operation legalization how to expand unsupported
  // ADDC/ADDE/SUBC/SUBE.  The problem is that these operations generate
  // a carry of type MVT::Glue, but there doesn't seem to be any way to
  // generate a value of this type in the expanded code sequence.
  bool hasCarry =
    TLI.isOperationLegalOrCustom(N->getOpcode() == ISD::ADD ?
                                   ISD::ADDC : ISD::SUBC,
                                 TLI.getTypeToExpandTo(*DAG.getContext(), NVT));

  if (hasCarry) {
    SDVTList VTList = DAG.getVTList(NVT, MVT::Glue);
    if (N->getOpcode() == ISD::ADD) {
      Lo = DAG.getNode(ISD::ADDC, dl, VTList, LoOps);
      HiOps[2] = Lo.getValue(1);
      Hi = DAG.getNode(ISD::ADDE, dl, VTList, HiOps);
    } else {
      Lo = DAG.getNode(ISD::SUBC, dl, VTList, LoOps);
      HiOps[2] = Lo.getValue(1);
      Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps);
    }
    return;
  }

  bool hasOVF =
    TLI.isOperationLegalOrCustom(N->getOpcode() == ISD::ADD ?
                                   ISD::UADDO : ISD::USUBO,
                                 TLI.getTypeToExpandTo(*DAG.getContext(), NVT));
  TargetLoweringBase::BooleanContent BoolType = TLI.getBooleanContents(NVT);

  if (hasOVF) {
    EVT OvfVT = getSetCCResultType(NVT);
    SDVTList VTList = DAG.getVTList(NVT, OvfVT);
    int RevOpc;
    if (N->getOpcode() == ISD::ADD) {
      RevOpc = ISD::SUB;
      Lo = DAG.getNode(ISD::UADDO, dl, VTList, LoOps);
      Hi = DAG.getNode(ISD::ADD, dl, NVT, makeArrayRef(HiOps, 2));
    } else {
      RevOpc = ISD::ADD;
      Lo = DAG.getNode(ISD::USUBO, dl, VTList, LoOps);
      Hi = DAG.getNode(ISD::SUB, dl, NVT, makeArrayRef(HiOps, 2));
    }
    SDValue OVF = Lo.getValue(1);

    switch (BoolType) {
    case TargetLoweringBase::UndefinedBooleanContent:
      OVF = DAG.getNode(ISD::AND, dl, OvfVT, DAG.getConstant(1, dl, OvfVT), OVF);
      LLVM_FALLTHROUGH;
    case TargetLoweringBase::ZeroOrOneBooleanContent:
      OVF = DAG.getZExtOrTrunc(OVF, dl, NVT);
      Hi = DAG.getNode(N->getOpcode(), dl, NVT, Hi, OVF);
      break;
    case TargetLoweringBase::ZeroOrNegativeOneBooleanContent:
      OVF = DAG.getSExtOrTrunc(OVF, dl, NVT);
      Hi = DAG.getNode(RevOpc, dl, NVT, Hi, OVF);
    }
    return;
  }

  if (N->getOpcode() == ISD::ADD) {
    Lo = DAG.getNode(ISD::ADD, dl, NVT, LoOps);
    Hi = DAG.getNode(ISD::ADD, dl, NVT, makeArrayRef(HiOps, 2));
    SDValue Cmp1 = DAG.getSetCC(dl, getSetCCResultType(NVT), Lo, LoOps[0],
                                ISD::SETULT);

    if (BoolType == TargetLoweringBase::ZeroOrOneBooleanContent) {
      SDValue Carry = DAG.getZExtOrTrunc(Cmp1, dl, NVT);
      Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, Carry);
      return;
    }

    SDValue Carry1 = DAG.getSelect(dl, NVT, Cmp1,
                                   DAG.getConstant(1, dl, NVT),
                                   DAG.getConstant(0, dl, NVT));
    SDValue Cmp2 = DAG.getSetCC(dl, getSetCCResultType(NVT), Lo, LoOps[1],
                                ISD::SETULT);
    SDValue Carry2 = DAG.getSelect(dl, NVT, Cmp2,
                                   DAG.getConstant(1, dl, NVT), Carry1);
    Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, Carry2);
  } else {
    Lo = DAG.getNode(ISD::SUB, dl, NVT, LoOps);
    Hi = DAG.getNode(ISD::SUB, dl, NVT, makeArrayRef(HiOps, 2));
    SDValue Cmp =
      DAG.getSetCC(dl, getSetCCResultType(LoOps[0].getValueType()),
                   LoOps[0], LoOps[1], ISD::SETULT);

    SDValue Borrow;
    if (BoolType == TargetLoweringBase::ZeroOrOneBooleanContent)
      Borrow = DAG.getZExtOrTrunc(Cmp, dl, NVT);
    else
      Borrow = DAG.getSelect(dl, NVT, Cmp, DAG.getConstant(1, dl, NVT),
                             DAG.getConstant(0, dl, NVT));

    Hi = DAG.getNode(ISD::SUB, dl, NVT, Hi, Borrow);
  }
}

void DAGTypeLegalizer::ExpandIntRes_ADDSUBC(SDNode *N,
                                            SDValue &Lo, SDValue &Hi) {
  // Expand the subcomponents.
  SDValue LHSL, LHSH, RHSL, RHSH;
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
  GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
  SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Glue);
  SDValue LoOps[2] = { LHSL, RHSL };
  SDValue HiOps[3] = { LHSH, RHSH };

  if (N->getOpcode() == ISD::ADDC) {
    Lo = DAG.getNode(ISD::ADDC, dl, VTList, LoOps);
    HiOps[2] = Lo.getValue(1);
    Hi = DAG.getNode(ISD::ADDE, dl, VTList, HiOps);
  } else {
    Lo = DAG.getNode(ISD::SUBC, dl, VTList, LoOps);
    HiOps[2] = Lo.getValue(1);
    Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps);
  }

  // Legalized the flag result - switch anything that used the old flag to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
}

void DAGTypeLegalizer::ExpandIntRes_ADDSUBE(SDNode *N,
                                            SDValue &Lo, SDValue &Hi) {
  // Expand the subcomponents.
  SDValue LHSL, LHSH, RHSL, RHSH;
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
  GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
  SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Glue);
  SDValue LoOps[3] = { LHSL, RHSL, N->getOperand(2) };
  SDValue HiOps[3] = { LHSH, RHSH };

  Lo = DAG.getNode(N->getOpcode(), dl, VTList, LoOps);
  HiOps[2] = Lo.getValue(1);
  Hi = DAG.getNode(N->getOpcode(), dl, VTList, HiOps);

  // Legalized the flag result - switch anything that used the old flag to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
}

void DAGTypeLegalizer::ExpandIntRes_UADDSUBO(SDNode *N,
                                             SDValue &Lo, SDValue &Hi) {
  SDValue LHS = N->getOperand(0);
  SDValue RHS = N->getOperand(1);
  SDLoc dl(N);

  SDValue Ovf;

  unsigned CarryOp, NoCarryOp;
  ISD::CondCode Cond;
  switch(N->getOpcode()) {
    case ISD::UADDO:
      CarryOp = ISD::ADDCARRY;
      NoCarryOp = ISD::ADD;
      Cond = ISD::SETULT;
      break;
    case ISD::USUBO:
      CarryOp = ISD::SUBCARRY;
      NoCarryOp = ISD::SUB;
      Cond = ISD::SETUGT;
      break;
    default:
      llvm_unreachable("Node has unexpected Opcode");
  }

  bool HasCarryOp = TLI.isOperationLegalOrCustom(
      CarryOp, TLI.getTypeToExpandTo(*DAG.getContext(), LHS.getValueType()));

  if (HasCarryOp) {
    // Expand the subcomponents.
    SDValue LHSL, LHSH, RHSL, RHSH;
    GetExpandedInteger(LHS, LHSL, LHSH);
    GetExpandedInteger(RHS, RHSL, RHSH);
    SDVTList VTList = DAG.getVTList(LHSL.getValueType(), N->getValueType(1));
    SDValue LoOps[2] = { LHSL, RHSL };
    SDValue HiOps[3] = { LHSH, RHSH };

    Lo = DAG.getNode(N->getOpcode(), dl, VTList, LoOps);
    HiOps[2] = Lo.getValue(1);
    Hi = DAG.getNode(CarryOp, dl, VTList, HiOps);

    Ovf = Hi.getValue(1);
  } else {
    // Expand the result by simply replacing it with the equivalent
    // non-overflow-checking operation.
    SDValue Sum = DAG.getNode(NoCarryOp, dl, LHS.getValueType(), LHS, RHS);
    SplitInteger(Sum, Lo, Hi);

    // Calculate the overflow: addition overflows iff a + b < a, and subtraction
    // overflows iff a - b > a.
    Ovf = DAG.getSetCC(dl, N->getValueType(1), Sum, LHS, Cond);
  }

  // Legalized the flag result - switch anything that used the old flag to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Ovf);
}

void DAGTypeLegalizer::ExpandIntRes_ADDSUBCARRY(SDNode *N,
                                                SDValue &Lo, SDValue &Hi) {
  // Expand the subcomponents.
  SDValue LHSL, LHSH, RHSL, RHSH;
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
  GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
  SDVTList VTList = DAG.getVTList(LHSL.getValueType(), N->getValueType(1));
  SDValue LoOps[3] = { LHSL, RHSL, N->getOperand(2) };
  SDValue HiOps[3] = { LHSH, RHSH, SDValue() };

  Lo = DAG.getNode(N->getOpcode(), dl, VTList, LoOps);
  HiOps[2] = Lo.getValue(1);
  Hi = DAG.getNode(N->getOpcode(), dl, VTList, HiOps);

  // Legalized the flag result - switch anything that used the old flag to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
}

void DAGTypeLegalizer::ExpandIntRes_ANY_EXTEND(SDNode *N,
                                               SDValue &Lo, SDValue &Hi) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);
  SDValue Op = N->getOperand(0);
  if (Op.getValueType().bitsLE(NVT)) {
    // The low part is any extension of the input (which degenerates to a copy).
    Lo = DAG.getNode(ISD::ANY_EXTEND, dl, NVT, Op);
    Hi = DAG.getUNDEF(NVT);   // The high part is undefined.
  } else {
    // For example, extension of an i48 to an i64.  The operand type necessarily
    // promotes to the result type, so will end up being expanded too.
    assert(getTypeAction(Op.getValueType()) ==
           TargetLowering::TypePromoteInteger &&
           "Only know how to promote this result!");
    SDValue Res = GetPromotedInteger(Op);
    assert(Res.getValueType() == N->getValueType(0) &&
           "Operand over promoted?");
    // Split the promoted operand.  This will simplify when it is expanded.
    SplitInteger(Res, Lo, Hi);
  }
}

void DAGTypeLegalizer::ExpandIntRes_AssertSext(SDNode *N,
                                               SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT NVT = Lo.getValueType();
  EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
  unsigned NVTBits = NVT.getSizeInBits();
  unsigned EVTBits = EVT.getSizeInBits();

  if (NVTBits < EVTBits) {
    Hi = DAG.getNode(ISD::AssertSext, dl, NVT, Hi,
                     DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
                                                        EVTBits - NVTBits)));
  } else {
    Lo = DAG.getNode(ISD::AssertSext, dl, NVT, Lo, DAG.getValueType(EVT));
    // The high part replicates the sign bit of Lo, make it explicit.
    Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
                     DAG.getConstant(NVTBits - 1, dl,
                                     TLI.getPointerTy(DAG.getDataLayout())));
  }
}

void DAGTypeLegalizer::ExpandIntRes_AssertZext(SDNode *N,
                                               SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT NVT = Lo.getValueType();
  EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
  unsigned NVTBits = NVT.getSizeInBits();
  unsigned EVTBits = EVT.getSizeInBits();

  if (NVTBits < EVTBits) {
    Hi = DAG.getNode(ISD::AssertZext, dl, NVT, Hi,
                     DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
                                                        EVTBits - NVTBits)));
  } else {
    Lo = DAG.getNode(ISD::AssertZext, dl, NVT, Lo, DAG.getValueType(EVT));
    // The high part must be zero, make it explicit.
    Hi = DAG.getConstant(0, dl, NVT);
  }
}

void DAGTypeLegalizer::ExpandIntRes_BITREVERSE(SDNode *N,
                                               SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), Hi, Lo);  // Note swapped operands.
  Lo = DAG.getNode(ISD::BITREVERSE, dl, Lo.getValueType(), Lo);
  Hi = DAG.getNode(ISD::BITREVERSE, dl, Hi.getValueType(), Hi);
}

void DAGTypeLegalizer::ExpandIntRes_BSWAP(SDNode *N,
                                          SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), Hi, Lo);  // Note swapped operands.
  Lo = DAG.getNode(ISD::BSWAP, dl, Lo.getValueType(), Lo);
  Hi = DAG.getNode(ISD::BSWAP, dl, Hi.getValueType(), Hi);
}

void DAGTypeLegalizer::ExpandIntRes_Constant(SDNode *N,
                                             SDValue &Lo, SDValue &Hi) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  unsigned NBitWidth = NVT.getSizeInBits();
  auto Constant = cast<ConstantSDNode>(N);
  const APInt &Cst = Constant->getAPIntValue();
  bool IsTarget = Constant->isTargetOpcode();
  bool IsOpaque = Constant->isOpaque();
  SDLoc dl(N);
  Lo = DAG.getConstant(Cst.trunc(NBitWidth), dl, NVT, IsTarget, IsOpaque);
  Hi = DAG.getConstant(Cst.lshr(NBitWidth).trunc(NBitWidth), dl, NVT, IsTarget,
                       IsOpaque);
}

void DAGTypeLegalizer::ExpandIntRes_ABS(SDNode *N, SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);

  // abs(HiLo) -> (Hi < 0 ? -HiLo : HiLo)
  EVT VT = N->getValueType(0);
  SDValue N0 = N->getOperand(0);
  SDValue Neg = DAG.getNode(ISD::SUB, dl, VT,
                            DAG.getConstant(0, dl, VT), N0);
  SDValue NegLo, NegHi;
  SplitInteger(Neg, NegLo, NegHi);

  GetExpandedInteger(N0, Lo, Hi);
  EVT NVT = Lo.getValueType();
  SDValue HiIsNeg = DAG.getSetCC(dl, getSetCCResultType(NVT),
                                 DAG.getConstant(0, dl, NVT), Hi, ISD::SETGT);
  Lo = DAG.getSelect(dl, NVT, HiIsNeg, NegLo, Lo);
  Hi = DAG.getSelect(dl, NVT, HiIsNeg, NegHi, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_CTLZ(SDNode *N,
                                         SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  // ctlz (HiLo) -> Hi != 0 ? ctlz(Hi) : (ctlz(Lo)+32)
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT NVT = Lo.getValueType();

  SDValue HiNotZero = DAG.getSetCC(dl, getSetCCResultType(NVT), Hi,
                                   DAG.getConstant(0, dl, NVT), ISD::SETNE);

  SDValue LoLZ = DAG.getNode(N->getOpcode(), dl, NVT, Lo);
  SDValue HiLZ = DAG.getNode(ISD::CTLZ_ZERO_UNDEF, dl, NVT, Hi);

  Lo = DAG.getSelect(dl, NVT, HiNotZero, HiLZ,
                     DAG.getNode(ISD::ADD, dl, NVT, LoLZ,
                                 DAG.getConstant(NVT.getSizeInBits(), dl,
                                                 NVT)));
  Hi = DAG.getConstant(0, dl, NVT);
}

void DAGTypeLegalizer::ExpandIntRes_CTPOP(SDNode *N,
                                          SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  // ctpop(HiLo) -> ctpop(Hi)+ctpop(Lo)
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT NVT = Lo.getValueType();
  Lo = DAG.getNode(ISD::ADD, dl, NVT, DAG.getNode(ISD::CTPOP, dl, NVT, Lo),
                   DAG.getNode(ISD::CTPOP, dl, NVT, Hi));
  Hi = DAG.getConstant(0, dl, NVT);
}

void DAGTypeLegalizer::ExpandIntRes_CTTZ(SDNode *N,
                                         SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  // cttz (HiLo) -> Lo != 0 ? cttz(Lo) : (cttz(Hi)+32)
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT NVT = Lo.getValueType();

  SDValue LoNotZero = DAG.getSetCC(dl, getSetCCResultType(NVT), Lo,
                                   DAG.getConstant(0, dl, NVT), ISD::SETNE);

  SDValue LoLZ = DAG.getNode(ISD::CTTZ_ZERO_UNDEF, dl, NVT, Lo);
  SDValue HiLZ = DAG.getNode(N->getOpcode(), dl, NVT, Hi);

  Lo = DAG.getSelect(dl, NVT, LoNotZero, LoLZ,
                     DAG.getNode(ISD::ADD, dl, NVT, HiLZ,
                                 DAG.getConstant(NVT.getSizeInBits(), dl,
                                                 NVT)));
  Hi = DAG.getConstant(0, dl, NVT);
}

void DAGTypeLegalizer::ExpandIntRes_FLT_ROUNDS(SDNode *N, SDValue &Lo,
                                               SDValue &Hi) {
  SDLoc dl(N);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  unsigned NBitWidth = NVT.getSizeInBits();

  EVT ShiftAmtTy = TLI.getShiftAmountTy(NVT, DAG.getDataLayout());
  Lo = DAG.getNode(ISD::FLT_ROUNDS_, dl, NVT);
  // The high part is the sign of Lo, as -1 is a valid value for FLT_ROUNDS
  Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
                   DAG.getConstant(NBitWidth - 1, dl, ShiftAmtTy));
}

void DAGTypeLegalizer::ExpandIntRes_FP_TO_SINT(SDNode *N, SDValue &Lo,
                                               SDValue &Hi) {
  SDLoc dl(N);
  EVT VT = N->getValueType(0);

  SDValue Op = N->getOperand(0);
  if (getTypeAction(Op.getValueType()) == TargetLowering::TypePromoteFloat)
    Op = GetPromotedFloat(Op);

  RTLIB::Libcall LC = RTLIB::getFPTOSINT(Op.getValueType(), VT);
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-sint conversion!");
  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, VT, Op, CallOptions, dl).first,
               Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_FP_TO_UINT(SDNode *N, SDValue &Lo,
                                               SDValue &Hi) {
  SDLoc dl(N);
  EVT VT = N->getValueType(0);

  SDValue Op = N->getOperand(0);
  if (getTypeAction(Op.getValueType()) == TargetLowering::TypePromoteFloat)
    Op = GetPromotedFloat(Op);

  RTLIB::Libcall LC = RTLIB::getFPTOUINT(Op.getValueType(), VT);
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-uint conversion!");
  TargetLowering::MakeLibCallOptions CallOptions;
  SplitInteger(TLI.makeLibCall(DAG, LC, VT, Op, CallOptions, dl).first,
               Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_LLROUND(SDNode *N, SDValue &Lo,
                                            SDValue &Hi) {
  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  EVT VT = N->getOperand(0).getValueType().getSimpleVT().SimpleTy;
  if (VT == MVT::f32)
    LC = RTLIB::LLROUND_F32;
  else if (VT == MVT::f64)
    LC = RTLIB::LLROUND_F64;
  else if (VT == MVT::f80)
    LC = RTLIB::LLROUND_F80;
  else if (VT == MVT::f128)
    LC = RTLIB::LLROUND_F128;
  else if (VT == MVT::ppcf128)
    LC = RTLIB::LLROUND_PPCF128;
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected llround input type!");

  SDValue Op = N->getOperand(0);
  if (getTypeAction(Op.getValueType()) == TargetLowering::TypePromoteFloat)
    Op = GetPromotedFloat(Op);

  SDLoc dl(N);
  EVT RetVT = N->getValueType(0);
  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, RetVT, Op, CallOptions, dl).first,
               Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_LLRINT(SDNode *N, SDValue &Lo,
                                            SDValue &Hi) {
  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  EVT VT = N->getOperand(0).getValueType().getSimpleVT().SimpleTy;
  if (VT == MVT::f32)
    LC = RTLIB::LLRINT_F32;
  else if (VT == MVT::f64)
    LC = RTLIB::LLRINT_F64;
  else if (VT == MVT::f80)
    LC = RTLIB::LLRINT_F80;
  else if (VT == MVT::f128)
    LC = RTLIB::LLRINT_F128;
  else if (VT == MVT::ppcf128)
    LC = RTLIB::LLRINT_PPCF128;
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected llrint input type!");

  SDValue Op = N->getOperand(0);
  if (getTypeAction(Op.getValueType()) == TargetLowering::TypePromoteFloat)
    Op = GetPromotedFloat(Op);

  SDLoc dl(N);
  EVT RetVT = N->getValueType(0);
  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, RetVT, Op, CallOptions, dl).first,
               Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_LOAD(LoadSDNode *N,
                                         SDValue &Lo, SDValue &Hi) {
  if (ISD::isNormalLoad(N)) {
    ExpandRes_NormalLoad(N, Lo, Hi);
    return;
  }

  assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");

  EVT VT = N->getValueType(0);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
  SDValue Ch  = N->getChain();
  SDValue Ptr = N->getBasePtr();
  ISD::LoadExtType ExtType = N->getExtensionType();
  unsigned Alignment = N->getAlignment();
  MachineMemOperand::Flags MMOFlags = N->getMemOperand()->getFlags();
  AAMDNodes AAInfo = N->getAAInfo();
  SDLoc dl(N);

  assert(NVT.isByteSized() && "Expanded type not byte sized!");

  if (N->getMemoryVT().bitsLE(NVT)) {
    EVT MemVT = N->getMemoryVT();

    Lo = DAG.getExtLoad(ExtType, dl, NVT, Ch, Ptr, N->getPointerInfo(), MemVT,
                        Alignment, MMOFlags, AAInfo);

    // Remember the chain.
    Ch = Lo.getValue(1);

    if (ExtType == ISD::SEXTLOAD) {
      // The high part is obtained by SRA'ing all but one of the bits of the
      // lo part.
      unsigned LoSize = Lo.getValueSizeInBits();
      Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
                       DAG.getConstant(LoSize - 1, dl,
                                       TLI.getPointerTy(DAG.getDataLayout())));
    } else if (ExtType == ISD::ZEXTLOAD) {
      // The high part is just a zero.
      Hi = DAG.getConstant(0, dl, NVT);
    } else {
      assert(ExtType == ISD::EXTLOAD && "Unknown extload!");
      // The high part is undefined.
      Hi = DAG.getUNDEF(NVT);
    }
  } else if (DAG.getDataLayout().isLittleEndian()) {
    // Little-endian - low bits are at low addresses.
    Lo = DAG.getLoad(NVT, dl, Ch, Ptr, N->getPointerInfo(), Alignment, MMOFlags,
                     AAInfo);

    unsigned ExcessBits =
      N->getMemoryVT().getSizeInBits() - NVT.getSizeInBits();
    EVT NEVT = EVT::getIntegerVT(*DAG.getContext(), ExcessBits);

    // Increment the pointer to the other half.
    unsigned IncrementSize = NVT.getSizeInBits()/8;
    Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
                      DAG.getConstant(IncrementSize, dl, Ptr.getValueType()));
    Hi = DAG.getExtLoad(ExtType, dl, NVT, Ch, Ptr,
                        N->getPointerInfo().getWithOffset(IncrementSize), NEVT,
                        MinAlign(Alignment, IncrementSize), MMOFlags, AAInfo);

    // Build a factor node to remember that this load is independent of the
    // other one.
    Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
                     Hi.getValue(1));
  } else {
    // Big-endian - high bits are at low addresses.  Favor aligned loads at
    // the cost of some bit-fiddling.
    EVT MemVT = N->getMemoryVT();
    unsigned EBytes = MemVT.getStoreSize();
    unsigned IncrementSize = NVT.getSizeInBits()/8;
    unsigned ExcessBits = (EBytes - IncrementSize)*8;

    // Load both the high bits and maybe some of the low bits.
    Hi = DAG.getExtLoad(ExtType, dl, NVT, Ch, Ptr, N->getPointerInfo(),
                        EVT::getIntegerVT(*DAG.getContext(),
                                          MemVT.getSizeInBits() - ExcessBits),
                        Alignment, MMOFlags, AAInfo);

    // Increment the pointer to the other half.
    Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
                      DAG.getConstant(IncrementSize, dl, Ptr.getValueType()));
    // Load the rest of the low bits.
    Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, NVT, Ch, Ptr,
                        N->getPointerInfo().getWithOffset(IncrementSize),
                        EVT::getIntegerVT(*DAG.getContext(), ExcessBits),
                        MinAlign(Alignment, IncrementSize), MMOFlags, AAInfo);

    // Build a factor node to remember that this load is independent of the
    // other one.
    Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
                     Hi.getValue(1));

    if (ExcessBits < NVT.getSizeInBits()) {
      // Transfer low bits from the bottom of Hi to the top of Lo.
      Lo = DAG.getNode(
          ISD::OR, dl, NVT, Lo,
          DAG.getNode(ISD::SHL, dl, NVT, Hi,
                      DAG.getConstant(ExcessBits, dl,
                                      TLI.getPointerTy(DAG.getDataLayout()))));
      // Move high bits to the right position in Hi.
      Hi = DAG.getNode(ExtType == ISD::SEXTLOAD ? ISD::SRA : ISD::SRL, dl, NVT,
                       Hi,
                       DAG.getConstant(NVT.getSizeInBits() - ExcessBits, dl,
                                       TLI.getPointerTy(DAG.getDataLayout())));
    }
  }

  // Legalize the chain result - switch anything that used the old chain to
  // use the new one.
  ReplaceValueWith(SDValue(N, 1), Ch);
}

void DAGTypeLegalizer::ExpandIntRes_Logical(SDNode *N,
                                            SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  SDValue LL, LH, RL, RH;
  GetExpandedInteger(N->getOperand(0), LL, LH);
  GetExpandedInteger(N->getOperand(1), RL, RH);
  Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), LL, RL);
  Hi = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), LH, RH);
}

void DAGTypeLegalizer::ExpandIntRes_MUL(SDNode *N,
                                        SDValue &Lo, SDValue &Hi) {
  EVT VT = N->getValueType(0);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
  SDLoc dl(N);

  SDValue LL, LH, RL, RH;
  GetExpandedInteger(N->getOperand(0), LL, LH);
  GetExpandedInteger(N->getOperand(1), RL, RH);

  if (TLI.expandMUL(N, Lo, Hi, NVT, DAG,
                    TargetLowering::MulExpansionKind::OnlyLegalOrCustom,
                    LL, LH, RL, RH))
    return;

  // If nothing else, we can make a libcall.
  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  if (VT == MVT::i16)
    LC = RTLIB::MUL_I16;
  else if (VT == MVT::i32)
    LC = RTLIB::MUL_I32;
  else if (VT == MVT::i64)
    LC = RTLIB::MUL_I64;
  else if (VT == MVT::i128)
    LC = RTLIB::MUL_I128;

  if (LC == RTLIB::UNKNOWN_LIBCALL || !TLI.getLibcallName(LC)) {
    // We'll expand the multiplication by brute force because we have no other
    // options. This is a trivially-generalized version of the code from
    // Hacker's Delight (itself derived from Knuth's Algorithm M from section
    // 4.3.1).
    unsigned Bits = NVT.getSizeInBits();
    unsigned HalfBits = Bits >> 1;
    SDValue Mask = DAG.getConstant(APInt::getLowBitsSet(Bits, HalfBits), dl,
                                   NVT);
    SDValue LLL = DAG.getNode(ISD::AND, dl, NVT, LL, Mask);
    SDValue RLL = DAG.getNode(ISD::AND, dl, NVT, RL, Mask);

    SDValue T = DAG.getNode(ISD::MUL, dl, NVT, LLL, RLL);
    SDValue TL = DAG.getNode(ISD::AND, dl, NVT, T, Mask);

    EVT ShiftAmtTy = TLI.getShiftAmountTy(NVT, DAG.getDataLayout());
    if (APInt::getMaxValue(ShiftAmtTy.getSizeInBits()).ult(HalfBits)) {
      // The type from TLI is too small to fit the shift amount we want.
      // Override it with i32. The shift will have to be legalized.
      ShiftAmtTy = MVT::i32;
    }
    SDValue Shift = DAG.getConstant(HalfBits, dl, ShiftAmtTy);
    SDValue TH = DAG.getNode(ISD::SRL, dl, NVT, T, Shift);
    SDValue LLH = DAG.getNode(ISD::SRL, dl, NVT, LL, Shift);
    SDValue RLH = DAG.getNode(ISD::SRL, dl, NVT, RL, Shift);

    SDValue U = DAG.getNode(ISD::ADD, dl, NVT,
                            DAG.getNode(ISD::MUL, dl, NVT, LLH, RLL), TH);
    SDValue UL = DAG.getNode(ISD::AND, dl, NVT, U, Mask);
    SDValue UH = DAG.getNode(ISD::SRL, dl, NVT, U, Shift);

    SDValue V = DAG.getNode(ISD::ADD, dl, NVT,
                            DAG.getNode(ISD::MUL, dl, NVT, LLL, RLH), UL);
    SDValue VH = DAG.getNode(ISD::SRL, dl, NVT, V, Shift);

    SDValue W = DAG.getNode(ISD::ADD, dl, NVT,
                            DAG.getNode(ISD::MUL, dl, NVT, LLH, RLH),
                            DAG.getNode(ISD::ADD, dl, NVT, UH, VH));
    Lo = DAG.getNode(ISD::ADD, dl, NVT, TL,
                     DAG.getNode(ISD::SHL, dl, NVT, V, Shift));

    Hi = DAG.getNode(ISD::ADD, dl, NVT, W,
                     DAG.getNode(ISD::ADD, dl, NVT,
                                 DAG.getNode(ISD::MUL, dl, NVT, RH, LL),
                                 DAG.getNode(ISD::MUL, dl, NVT, RL, LH)));
    return;
  }

  SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, VT, Ops, CallOptions, dl).first,
               Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_READCYCLECOUNTER(SDNode *N, SDValue &Lo,
                                                     SDValue &Hi) {
  SDLoc DL(N);
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDVTList VTs = DAG.getVTList(NVT, NVT, MVT::Other);
  SDValue R = DAG.getNode(N->getOpcode(), DL, VTs, N->getOperand(0));
  Lo = R.getValue(0);
  Hi = R.getValue(1);
  ReplaceValueWith(SDValue(N, 1), R.getValue(2));
}

void DAGTypeLegalizer::ExpandIntRes_ADDSUBSAT(SDNode *N, SDValue &Lo,
                                              SDValue &Hi) {
  SDValue Result = TLI.expandAddSubSat(N, DAG);
  SplitInteger(Result, Lo, Hi);
}

/// This performs an expansion of the integer result for a fixed point
/// multiplication. The default expansion performs rounding down towards
/// negative infinity, though targets that do care about rounding should specify
/// a target hook for rounding and provide their own expansion or lowering of
/// fixed point multiplication to be consistent with rounding.
void DAGTypeLegalizer::ExpandIntRes_MULFIX(SDNode *N, SDValue &Lo,
                                           SDValue &Hi) {
  SDLoc dl(N);
  EVT VT = N->getValueType(0);
  unsigned VTSize = VT.getScalarSizeInBits();
  SDValue LHS = N->getOperand(0);
  SDValue RHS = N->getOperand(1);
  uint64_t Scale = N->getConstantOperandVal(2);
  bool Saturating = (N->getOpcode() == ISD::SMULFIXSAT ||
                     N->getOpcode() == ISD::UMULFIXSAT);
  bool Signed = (N->getOpcode() == ISD::SMULFIX ||
                 N->getOpcode() == ISD::SMULFIXSAT);

  // Handle special case when scale is equal to zero.
  if (!Scale) {
    SDValue Result;
    if (!Saturating) {
      Result = DAG.getNode(ISD::MUL, dl, VT, LHS, RHS);
    } else {
      EVT BoolVT = getSetCCResultType(VT);
      unsigned MulOp = Signed ? ISD::SMULO : ISD::UMULO;
      Result = DAG.getNode(MulOp, dl, DAG.getVTList(VT, BoolVT), LHS, RHS);
      SDValue Product = Result.getValue(0);
      SDValue Overflow = Result.getValue(1);
      if (Signed) {
        APInt MinVal = APInt::getSignedMinValue(VTSize);
        APInt MaxVal = APInt::getSignedMaxValue(VTSize);
        SDValue SatMin = DAG.getConstant(MinVal, dl, VT);
        SDValue SatMax = DAG.getConstant(MaxVal, dl, VT);
        SDValue Zero = DAG.getConstant(0, dl, VT);
        SDValue ProdNeg = DAG.getSetCC(dl, BoolVT, Product, Zero, ISD::SETLT);
        Result = DAG.getSelect(dl, VT, ProdNeg, SatMax, SatMin);
        Result = DAG.getSelect(dl, VT, Overflow, Result, Product);
      } else {
        // For unsigned multiplication, we only need to check the max since we
        // can't really overflow towards zero.
        APInt MaxVal = APInt::getMaxValue(VTSize);
        SDValue SatMax = DAG.getConstant(MaxVal, dl, VT);
        Result = DAG.getSelect(dl, VT, Overflow, SatMax, Product);
      }
    }
    SplitInteger(Result, Lo, Hi);
    return;
  }

  // For SMULFIX[SAT] we only expect to find Scale<VTSize, but this assert will
  // cover for unhandled cases below, while still being valid for UMULFIX[SAT].
  assert(Scale <= VTSize && "Scale can't be larger than the value type size.");

  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
  SDValue LL, LH, RL, RH;
  GetExpandedInteger(LHS, LL, LH);
  GetExpandedInteger(RHS, RL, RH);
  SmallVector<SDValue, 4> Result;

  unsigned LoHiOp = Signed ? ISD::SMUL_LOHI : ISD::UMUL_LOHI;
  if (!TLI.expandMUL_LOHI(LoHiOp, VT, dl, LHS, RHS, Result, NVT, DAG,
                          TargetLowering::MulExpansionKind::OnlyLegalOrCustom,
                          LL, LH, RL, RH)) {
    report_fatal_error("Unable to expand MUL_FIX using MUL_LOHI.");
    return;
  }

  unsigned NVTSize = NVT.getScalarSizeInBits();
  assert((VTSize == NVTSize * 2) && "Expected the new value type to be half "
                                    "the size of the current value type");
  EVT ShiftTy = TLI.getShiftAmountTy(NVT, DAG.getDataLayout());

  // After getting the multiplication result in 4 parts, we need to perform a
  // shift right by the amount of the scale to get the result in that scale.
  //
  // Let's say we multiply 2 64 bit numbers. The resulting value can be held in
  // 128 bits that are cut into 4 32-bit parts:
  //
  //      HH       HL       LH       LL
  //  |---32---|---32---|---32---|---32---|
  // 128      96       64       32        0
  //
  //                    |------VTSize-----|
  //
  //                             |NVTSize-|
  //
  // The resulting Lo and Hi would normally be in LL and LH after the shift. But
  // to avoid unneccessary shifting of all 4 parts, we can adjust the shift
  // amount and get Lo and Hi using two funnel shifts. Or for the special case
  // when Scale is a multiple of NVTSize we can just pick the result without
  // shifting.
  uint64_t Part0 = Scale / NVTSize; // Part holding lowest bit needed.
  if (Scale % NVTSize) {
    SDValue ShiftAmount = DAG.getConstant(Scale % NVTSize, dl, ShiftTy);
    Lo = DAG.getNode(ISD::FSHR, dl, NVT, Result[Part0 + 1], Result[Part0],
                     ShiftAmount);
    Hi = DAG.getNode(ISD::FSHR, dl, NVT, Result[Part0 + 2], Result[Part0 + 1],
                     ShiftAmount);
  } else {
    Lo = Result[Part0];
    Hi = Result[Part0 + 1];
  }

  // Unless saturation is requested we are done. The result is in <Hi,Lo>.
  if (!Saturating)
    return;

  // Can not overflow when there is no integer part.
  if (Scale == VTSize)
    return;

  // To handle saturation we must check for overflow in the multiplication.
  //
  // Unsigned overflow happened if the upper (VTSize - Scale) bits (of Result)
  // aren't all zeroes.
  //
  // Signed overflow happened if the upper (VTSize - Scale + 1) bits (of Result)
  // aren't all ones or all zeroes.
  //
  // We cannot overflow past HH when multiplying 2 ints of size VTSize, so the
  // highest bit of HH determines saturation direction in the event of signed
  // saturation.

  SDValue ResultHL = Result[2];
  SDValue ResultHH = Result[3];

  SDValue SatMax, SatMin;
  SDValue NVTZero = DAG.getConstant(0, dl, NVT);
  SDValue NVTNeg1 = DAG.getConstant(-1, dl, NVT);
  EVT BoolNVT = getSetCCResultType(NVT);

  if (!Signed) {
    if (Scale < NVTSize) {
      // Overflow happened if ((HH | (HL >> Scale)) != 0).
      SDValue HLAdjusted = DAG.getNode(ISD::SRL, dl, NVT, ResultHL,
                                       DAG.getConstant(Scale, dl, ShiftTy));
      SDValue Tmp = DAG.getNode(ISD::OR, dl, NVT, HLAdjusted, ResultHH);
      SatMax = DAG.getSetCC(dl, BoolNVT, Tmp, NVTZero, ISD::SETNE);
    } else if (Scale == NVTSize) {
      // Overflow happened if (HH != 0).
      SatMax = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTZero, ISD::SETNE);
    } else if (Scale < VTSize) {
      // Overflow happened if ((HH >> (Scale - NVTSize)) != 0).
      SDValue HLAdjusted = DAG.getNode(ISD::SRL, dl, NVT, ResultHL,
                                       DAG.getConstant(Scale - NVTSize, dl,
                                                       ShiftTy));
      SatMax = DAG.getSetCC(dl, BoolNVT, HLAdjusted, NVTZero, ISD::SETNE);
    } else
      llvm_unreachable("Scale must be less or equal to VTSize for UMULFIXSAT"
                       "(and saturation can't happen with Scale==VTSize).");

    Hi = DAG.getSelect(dl, NVT, SatMax, NVTNeg1, Hi);
    Lo = DAG.getSelect(dl, NVT, SatMax, NVTNeg1, Lo);
    return;
  }

  if (Scale < NVTSize) {
    // The number of overflow bits we can check are VTSize - Scale + 1 (we
    // include the sign bit). If these top bits are > 0, then we overflowed past
    // the max value. If these top bits are < -1, then we overflowed past the
    // min value. Otherwise, we did not overflow.
    unsigned OverflowBits = VTSize - Scale + 1;
    assert(OverflowBits <= VTSize && OverflowBits > NVTSize &&
           "Extent of overflow bits must start within HL");
    SDValue HLHiMask = DAG.getConstant(
        APInt::getHighBitsSet(NVTSize, OverflowBits - NVTSize), dl, NVT);
    SDValue HLLoMask = DAG.getConstant(
        APInt::getLowBitsSet(NVTSize, VTSize - OverflowBits), dl, NVT);
    // We overflow max if HH > 0 or (HH == 0 && HL > HLLoMask).
    SDValue HHGT0 = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTZero, ISD::SETGT);
    SDValue HHEQ0 = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTZero, ISD::SETEQ);
    SDValue HLUGT = DAG.getSetCC(dl, BoolNVT, ResultHL, HLLoMask, ISD::SETUGT);
    SatMax = DAG.getNode(ISD::OR, dl, BoolNVT, HHGT0,
                         DAG.getNode(ISD::AND, dl, BoolNVT, HHEQ0, HLUGT));
    // We overflow min if HH < -1 or (HH == -1 && HL < HLHiMask).
    SDValue HHLT = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTNeg1, ISD::SETLT);
    SDValue HHEQ = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTNeg1, ISD::SETEQ);
    SDValue HLULT = DAG.getSetCC(dl, BoolNVT, ResultHL, HLHiMask, ISD::SETULT);
    SatMin = DAG.getNode(ISD::OR, dl, BoolNVT, HHLT,
                         DAG.getNode(ISD::AND, dl, BoolNVT, HHEQ, HLULT));
  } else if (Scale == NVTSize) {
    // We overflow max if HH > 0 or (HH == 0 && HL sign bit is 1).
    SDValue HHGT0 = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTZero, ISD::SETGT);
    SDValue HHEQ0 = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTZero, ISD::SETEQ);
    SDValue HLNeg = DAG.getSetCC(dl, BoolNVT, ResultHL, NVTZero, ISD::SETLT);
    SatMax = DAG.getNode(ISD::OR, dl, BoolNVT, HHGT0,
                         DAG.getNode(ISD::AND, dl, BoolNVT, HHEQ0, HLNeg));
    // We overflow min if HH < -1 or (HH == -1 && HL sign bit is 0).
    SDValue HHLT = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTNeg1, ISD::SETLT);
    SDValue HHEQ = DAG.getSetCC(dl, BoolNVT, ResultHH, NVTNeg1, ISD::SETEQ);
    SDValue HLPos = DAG.getSetCC(dl, BoolNVT, ResultHL, NVTZero, ISD::SETGE);
    SatMin = DAG.getNode(ISD::OR, dl, BoolNVT, HHLT,
                         DAG.getNode(ISD::AND, dl, BoolNVT, HHEQ, HLPos));
  } else if (Scale < VTSize) {
    // This is similar to the case when we saturate if Scale < NVTSize, but we
    // only need to check HH.
    unsigned OverflowBits = VTSize - Scale + 1;
    SDValue HHHiMask = DAG.getConstant(
        APInt::getHighBitsSet(NVTSize, OverflowBits), dl, NVT);
    SDValue HHLoMask = DAG.getConstant(
        APInt::getLowBitsSet(NVTSize, NVTSize - OverflowBits), dl, NVT);
    SatMax = DAG.getSetCC(dl, BoolNVT, ResultHH, HHLoMask, ISD::SETGT);
    SatMin = DAG.getSetCC(dl, BoolNVT, ResultHH, HHHiMask, ISD::SETLT);
  } else
    llvm_unreachable("Illegal scale for signed fixed point mul.");

  // Saturate to signed maximum.
  APInt MaxHi = APInt::getSignedMaxValue(NVTSize);
  APInt MaxLo = APInt::getAllOnesValue(NVTSize);
  Hi = DAG.getSelect(dl, NVT, SatMax, DAG.getConstant(MaxHi, dl, NVT), Hi);
  Lo = DAG.getSelect(dl, NVT, SatMax, DAG.getConstant(MaxLo, dl, NVT), Lo);
  // Saturate to signed minimum.
  APInt MinHi = APInt::getSignedMinValue(NVTSize);
  Hi = DAG.getSelect(dl, NVT, SatMin, DAG.getConstant(MinHi, dl, NVT), Hi);
  Lo = DAG.getSelect(dl, NVT, SatMin, NVTZero, Lo);
}

void DAGTypeLegalizer::ExpandIntRes_SADDSUBO(SDNode *Node,
                                             SDValue &Lo, SDValue &Hi) {
  SDValue LHS = Node->getOperand(0);
  SDValue RHS = Node->getOperand(1);
  SDLoc dl(Node);

  // Expand the result by simply replacing it with the equivalent
  // non-overflow-checking operation.
  SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::SADDO ?
                            ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
                            LHS, RHS);
  SplitInteger(Sum, Lo, Hi);

  // Compute the overflow.
  //
  //   LHSSign -> LHS >= 0
  //   RHSSign -> RHS >= 0
  //   SumSign -> Sum >= 0
  //
  //   Add:
  //   Overflow -> (LHSSign == RHSSign) && (LHSSign != SumSign)
  //   Sub:
  //   Overflow -> (LHSSign != RHSSign) && (LHSSign != SumSign)
  //
  EVT OType = Node->getValueType(1);
  SDValue Zero = DAG.getConstant(0, dl, LHS.getValueType());

  SDValue LHSSign = DAG.getSetCC(dl, OType, LHS, Zero, ISD::SETGE);
  SDValue RHSSign = DAG.getSetCC(dl, OType, RHS, Zero, ISD::SETGE);
  SDValue SignsMatch = DAG.getSetCC(dl, OType, LHSSign, RHSSign,
                                    Node->getOpcode() == ISD::SADDO ?
                                    ISD::SETEQ : ISD::SETNE);

  SDValue SumSign = DAG.getSetCC(dl, OType, Sum, Zero, ISD::SETGE);
  SDValue SumSignNE = DAG.getSetCC(dl, OType, LHSSign, SumSign, ISD::SETNE);

  SDValue Cmp = DAG.getNode(ISD::AND, dl, OType, SignsMatch, SumSignNE);

  // Use the calculated overflow everywhere.
  ReplaceValueWith(SDValue(Node, 1), Cmp);
}

void DAGTypeLegalizer::ExpandIntRes_SDIV(SDNode *N,
                                         SDValue &Lo, SDValue &Hi) {
  EVT VT = N->getValueType(0);
  SDLoc dl(N);
  SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };

  if (TLI.getOperationAction(ISD::SDIVREM, VT) == TargetLowering::Custom) {
    SDValue Res = DAG.getNode(ISD::SDIVREM, dl, DAG.getVTList(VT, VT), Ops);
    SplitInteger(Res.getValue(0), Lo, Hi);
    return;
  }

  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  if (VT == MVT::i16)
    LC = RTLIB::SDIV_I16;
  else if (VT == MVT::i32)
    LC = RTLIB::SDIV_I32;
  else if (VT == MVT::i64)
    LC = RTLIB::SDIV_I64;
  else if (VT == MVT::i128)
    LC = RTLIB::SDIV_I128;
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");

  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, VT, Ops, CallOptions, dl).first, Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_Shift(SDNode *N,
                                          SDValue &Lo, SDValue &Hi) {
  EVT VT = N->getValueType(0);
  SDLoc dl(N);

  // If we can emit an efficient shift operation, do so now.  Check to see if
  // the RHS is a constant.
  if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
    return ExpandShiftByConstant(N, CN->getAPIntValue(), Lo, Hi);

  // If we can determine that the high bit of the shift is zero or one, even if
  // the low bits are variable, emit this shift in an optimized form.
  if (ExpandShiftWithKnownAmountBit(N, Lo, Hi))
    return;

  // If this target supports shift_PARTS, use it.  First, map to the _PARTS opc.
  unsigned PartsOpc;
  if (N->getOpcode() == ISD::SHL) {
    PartsOpc = ISD::SHL_PARTS;
  } else if (N->getOpcode() == ISD::SRL) {
    PartsOpc = ISD::SRL_PARTS;
  } else {
    assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
    PartsOpc = ISD::SRA_PARTS;
  }

  // Next check to see if the target supports this SHL_PARTS operation or if it
  // will custom expand it. Don't lower this to SHL_PARTS when we optimise for
  // size, but create a libcall instead.
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
  TargetLowering::LegalizeAction Action = TLI.getOperationAction(PartsOpc, NVT);
  const bool LegalOrCustom =
    (Action == TargetLowering::Legal && TLI.isTypeLegal(NVT)) ||
    Action == TargetLowering::Custom;

  if (LegalOrCustom && TLI.shouldExpandShift(DAG, N)) {
    // Expand the subcomponents.
    SDValue LHSL, LHSH;
    GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
    EVT VT = LHSL.getValueType();

    // If the shift amount operand is coming from a vector legalization it may
    // have an illegal type.  Fix that first by casting the operand, otherwise
    // the new SHL_PARTS operation would need further legalization.
    SDValue ShiftOp = N->getOperand(1);
    EVT ShiftTy = TLI.getShiftAmountTy(VT, DAG.getDataLayout());
    assert(ShiftTy.getScalarSizeInBits() >=
           Log2_32_Ceil(VT.getScalarSizeInBits()) &&
           "ShiftAmountTy is too small to cover the range of this type!");
    if (ShiftOp.getValueType() != ShiftTy)
      ShiftOp = DAG.getZExtOrTrunc(ShiftOp, dl, ShiftTy);

    SDValue Ops[] = { LHSL, LHSH, ShiftOp };
    Lo = DAG.getNode(PartsOpc, dl, DAG.getVTList(VT, VT), Ops);
    Hi = Lo.getValue(1);
    return;
  }

  // Otherwise, emit a libcall.
  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  bool isSigned;
  if (N->getOpcode() == ISD::SHL) {
    isSigned = false; /*sign irrelevant*/
    if (VT == MVT::i16)
      LC = RTLIB::SHL_I16;
    else if (VT == MVT::i32)
      LC = RTLIB::SHL_I32;
    else if (VT == MVT::i64)
      LC = RTLIB::SHL_I64;
    else if (VT == MVT::i128)
      LC = RTLIB::SHL_I128;
  } else if (N->getOpcode() == ISD::SRL) {
    isSigned = false;
    if (VT == MVT::i16)
      LC = RTLIB::SRL_I16;
    else if (VT == MVT::i32)
      LC = RTLIB::SRL_I32;
    else if (VT == MVT::i64)
      LC = RTLIB::SRL_I64;
    else if (VT == MVT::i128)
      LC = RTLIB::SRL_I128;
  } else {
    assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
    isSigned = true;
    if (VT == MVT::i16)
      LC = RTLIB::SRA_I16;
    else if (VT == MVT::i32)
      LC = RTLIB::SRA_I32;
    else if (VT == MVT::i64)
      LC = RTLIB::SRA_I64;
    else if (VT == MVT::i128)
      LC = RTLIB::SRA_I128;
  }

  if (LC != RTLIB::UNKNOWN_LIBCALL && TLI.getLibcallName(LC)) {
    SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
    TargetLowering::MakeLibCallOptions CallOptions;
    CallOptions.setSExt(isSigned);
    SplitInteger(TLI.makeLibCall(DAG, LC, VT, Ops, CallOptions, dl).first, Lo, Hi);
    return;
  }

  if (!ExpandShiftWithUnknownAmountBit(N, Lo, Hi))
    llvm_unreachable("Unsupported shift!");
}

void DAGTypeLegalizer::ExpandIntRes_SIGN_EXTEND(SDNode *N,
                                                SDValue &Lo, SDValue &Hi) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);
  SDValue Op = N->getOperand(0);
  if (Op.getValueType().bitsLE(NVT)) {
    // The low part is sign extension of the input (degenerates to a copy).
    Lo = DAG.getNode(ISD::SIGN_EXTEND, dl, NVT, N->getOperand(0));
    // The high part is obtained by SRA'ing all but one of the bits of low part.
    unsigned LoSize = NVT.getSizeInBits();
    Hi = DAG.getNode(
        ISD::SRA, dl, NVT, Lo,
        DAG.getConstant(LoSize - 1, dl, TLI.getPointerTy(DAG.getDataLayout())));
  } else {
    // For example, extension of an i48 to an i64.  The operand type necessarily
    // promotes to the result type, so will end up being expanded too.
    assert(getTypeAction(Op.getValueType()) ==
           TargetLowering::TypePromoteInteger &&
           "Only know how to promote this result!");
    SDValue Res = GetPromotedInteger(Op);
    assert(Res.getValueType() == N->getValueType(0) &&
           "Operand over promoted?");
    // Split the promoted operand.  This will simplify when it is expanded.
    SplitInteger(Res, Lo, Hi);
    unsigned ExcessBits = Op.getValueSizeInBits() - NVT.getSizeInBits();
    Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Hi.getValueType(), Hi,
                     DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
                                                        ExcessBits)));
  }
}

void DAGTypeLegalizer::
ExpandIntRes_SIGN_EXTEND_INREG(SDNode *N, SDValue &Lo, SDValue &Hi) {
  SDLoc dl(N);
  GetExpandedInteger(N->getOperand(0), Lo, Hi);
  EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();

  if (EVT.bitsLE(Lo.getValueType())) {
    // sext_inreg the low part if needed.
    Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Lo.getValueType(), Lo,
                     N->getOperand(1));

    // The high part gets the sign extension from the lo-part.  This handles
    // things like sextinreg V:i64 from i8.
    Hi = DAG.getNode(ISD::SRA, dl, Hi.getValueType(), Lo,
                     DAG.getConstant(Hi.getValueSizeInBits() - 1, dl,
                                     TLI.getPointerTy(DAG.getDataLayout())));
  } else {
    // For example, extension of an i48 to an i64.  Leave the low part alone,
    // sext_inreg the high part.
    unsigned ExcessBits = EVT.getSizeInBits() - Lo.getValueSizeInBits();
    Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Hi.getValueType(), Hi,
                     DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
                                                        ExcessBits)));
  }
}

void DAGTypeLegalizer::ExpandIntRes_SREM(SDNode *N,
                                         SDValue &Lo, SDValue &Hi) {
  EVT VT = N->getValueType(0);
  SDLoc dl(N);
  SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };

  if (TLI.getOperationAction(ISD::SDIVREM, VT) == TargetLowering::Custom) {
    SDValue Res = DAG.getNode(ISD::SDIVREM, dl, DAG.getVTList(VT, VT), Ops);
    SplitInteger(Res.getValue(1), Lo, Hi);
    return;
  }

  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
  if (VT == MVT::i16)
    LC = RTLIB::SREM_I16;
  else if (VT == MVT::i32)
    LC = RTLIB::SREM_I32;
  else if (VT == MVT::i64)
    LC = RTLIB::SREM_I64;
  else if (VT == MVT::i128)
    LC = RTLIB::SREM_I128;
  assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");

  TargetLowering::MakeLibCallOptions CallOptions;
  CallOptions.setSExt(true);
  SplitInteger(TLI.makeLibCall(DAG, LC, VT, Ops, CallOptions, dl).first, Lo, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_TRUNCATE(SDNode *N,
                                             SDValue &Lo, SDValue &Hi) {
  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
  SDLoc dl(N);
  Lo = DAG.getNode(ISD::TRUNCATE, dl, NVT, N->getOperand(0));
  Hi = DAG.getNode(ISD::SRL, dl, N->getOperand(0).getValueType(),
                   N->getOperand(0),
                   DAG.getConstant(NVT.getSizeInBits(), dl,
                                   TLI.getPointerTy(DAG.getDataLayout())));
  Hi = DAG.getNode(ISD::TRUNCATE, dl, NVT, Hi);
}

void DAGTypeLegalizer::ExpandIntRes_XMULO(SDNode *N,
                                          SDValue &Lo, SDValue &Hi) {
  EVT VT = N->getValueType(0);
  SDLoc dl(N);

  if (N->getOpcode() == ISD::UMULO) {
    // This section expands the operation into the following sequence of
    // instructions. `iNh` here refers to a type which has half the bit width of
    // the type the original operation operated on.
    //
    // %0 = %LHS.HI != 0 && %RHS.HI != 0
    // %1 = { iNh, i1 } @umul.with.overflow.iNh(iNh %LHS.HI, iNh %RHS.LO)
    // %2 = { iNh, i1 } @umul.with.overflow.iNh(iNh %RHS.HI, iNh %LHS.LO)
    // %3 = mul nuw iN (%LHS.LOW as iN), (%RHS.LOW as iN)
    // %4 = add iN (%1.0 as iN) << Nh, (%2.0 as iN) << Nh
    // %5 = { iN, i1 } @uadd.with.overflow.iN( %4, %3 )
    //
    // %res = { %5.0, %0 || %1.1 || %2.1 || %5.1 }
    SDValue LHS = N->getOperand(0), RHS = N->getOperand(1);
    SDValue LHSHigh, LHSLow, RHSHigh, RHSLow;
    SplitInteger(LHS, LHSLow, LHSHigh);
    SplitInteger(RHS, RHSLow, RHSHigh);
    EVT HalfVT = LHSLow.getValueType()
      , BitVT = N->getValueType(1);
    SDVTList VTHalfMulO = DAG.getVTList(HalfVT, BitVT);
    SDVTList VTFullAddO = DAG.getVTList(VT, BitVT);

    SDValue HalfZero = DAG.getConstant(0, dl, HalfVT);
    SDValue Overflow = DAG.getNode(ISD::AND, dl, BitVT,
      DAG.getSetCC(dl, BitVT, LHSHigh, HalfZero, ISD::SETNE),
      DAG.getSetCC(dl, BitVT, RHSHigh, HalfZero, ISD::SETNE));

    SDValue One = DAG.getNode(ISD::UMULO, dl, VTHalfMulO, LHSHigh, RHSLow);
    Overflow = DAG.getNode(ISD::OR, dl, BitVT, Overflow, One.getValue(1));
    SDValue OneInHigh = DAG.getNode(ISD::BUILD_PAIR, dl, VT, HalfZero,
                                    One.getValue(0));

    SDValue Two = DAG.getNode(ISD::UMULO, dl, VTHalfMulO, RHSHigh, LHSLow);
    Overflow = DAG.getNode(ISD::OR, dl, BitVT, Overflow, Two.getValue(1));
    SDValue TwoInHigh = DAG.getNode(ISD::BUILD_PAIR, dl, VT, HalfZero,
                                    Two.getValue(0));

    // Cannot use `UMUL_LOHI` directly, because some 32-bit targets (ARM) do not
    // know how to expand `i64,i64 = umul_lohi a, b` and abort (why isn’t this
    // operation recursively legalized?).
    //
    // Many backends understand this pattern and will convert into LOHI
    // themselves, if applicable.
    SDValue Three = DAG.getNode(ISD::MUL, dl, VT,
      DAG.getNode(ISD::ZERO_EXTEND, dl, VT, LHSLow),
      DAG.getNode(ISD::ZERO_EXTEND, dl, VT, RHSLow));
    SDValue Four = DAG.getNode(ISD::ADD, dl, VT, OneInHigh, TwoInHigh);
    SDValue Five = DAG.getNode(ISD::UADDO, dl, VTFullAddO, Three, Four);
    Overflow = DAG.getNode(ISD::OR, dl, BitVT, Overflow, Five.getValue(1));
    SplitInteger(Five, Lo, Hi);
    ReplaceValueWith(SDValue(N, 1), Overflow);
    return;
  }

  Type *RetTy = VT.getTypeForEVT(*DAG.getContext());
  EVT PtrVT = TLI.getPointerTy(DAG.get