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LegalizeFloatTypes.cpp
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LegalizeFloatTypes.cpp
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//===-------- LegalizeFloatTypes.cpp - Legalization of float 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 float type expansion and softening for LegalizeTypes.
// Softening is the act of turning a computation in an illegal floating point
// type into a computation in an integer type of the same size; also known as
// "soft float". For example, turning f32 arithmetic into operations using i32.
// The resulting integer value is the same as what you would get by performing
// the floating point operation and bitcasting the result to the integer type.
// Expansion is the act of changing a computation in an illegal type to be a
// computation in two identical registers of a smaller type. For example,
// implementing ppcf128 arithmetic in two f64 registers.
//
//===----------------------------------------------------------------------===//
#include "LegalizeTypes.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "legalize-types"
/// GetFPLibCall - Return the right libcall for the given floating point type.
static RTLIB::Libcall GetFPLibCall(EVT VT,
RTLIB::Libcall Call_F32,
RTLIB::Libcall Call_F64,
RTLIB::Libcall Call_F80,
RTLIB::Libcall Call_F128,
RTLIB::Libcall Call_PPCF128) {
return
VT == MVT::f32 ? Call_F32 :
VT == MVT::f64 ? Call_F64 :
VT == MVT::f80 ? Call_F80 :
VT == MVT::f128 ? Call_F128 :
VT == MVT::ppcf128 ? Call_PPCF128 :
RTLIB::UNKNOWN_LIBCALL;
}
//===----------------------------------------------------------------------===//
// Convert Float Results to Integer
//===----------------------------------------------------------------------===//
void DAGTypeLegalizer::SoftenFloatResult(SDNode *N, unsigned ResNo) {
LLVM_DEBUG(dbgs() << "Soften float result " << ResNo << ": "; N->dump(&DAG);
dbgs() << "\n");
SDValue R = SDValue();
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
dbgs() << "SoftenFloatResult #" << ResNo << ": ";
N->dump(&DAG); dbgs() << "\n";
#endif
llvm_unreachable("Do not know how to soften the result of this operator!");
case ISD::MERGE_VALUES:R = SoftenFloatRes_MERGE_VALUES(N, ResNo); break;
case ISD::BITCAST: R = SoftenFloatRes_BITCAST(N); break;
case ISD::BUILD_PAIR: R = SoftenFloatRes_BUILD_PAIR(N); break;
case ISD::ConstantFP: R = SoftenFloatRes_ConstantFP(N); break;
case ISD::EXTRACT_VECTOR_ELT:
R = SoftenFloatRes_EXTRACT_VECTOR_ELT(N, ResNo); break;
case ISD::FABS: R = SoftenFloatRes_FABS(N); break;
case ISD::STRICT_FMINNUM:
case ISD::FMINNUM: R = SoftenFloatRes_FMINNUM(N); break;
case ISD::STRICT_FMAXNUM:
case ISD::FMAXNUM: R = SoftenFloatRes_FMAXNUM(N); break;
case ISD::STRICT_FADD:
case ISD::FADD: R = SoftenFloatRes_FADD(N); break;
case ISD::FCBRT: R = SoftenFloatRes_FCBRT(N); break;
case ISD::STRICT_FCEIL:
case ISD::FCEIL: R = SoftenFloatRes_FCEIL(N); break;
case ISD::FCOPYSIGN: R = SoftenFloatRes_FCOPYSIGN(N); break;
case ISD::STRICT_FCOS:
case ISD::FCOS: R = SoftenFloatRes_FCOS(N); break;
case ISD::STRICT_FDIV:
case ISD::FDIV: R = SoftenFloatRes_FDIV(N); break;
case ISD::STRICT_FEXP:
case ISD::FEXP: R = SoftenFloatRes_FEXP(N); break;
case ISD::STRICT_FEXP2:
case ISD::FEXP2: R = SoftenFloatRes_FEXP2(N); break;
case ISD::STRICT_FFLOOR:
case ISD::FFLOOR: R = SoftenFloatRes_FFLOOR(N); break;
case ISD::STRICT_FLOG:
case ISD::FLOG: R = SoftenFloatRes_FLOG(N); break;
case ISD::STRICT_FLOG2:
case ISD::FLOG2: R = SoftenFloatRes_FLOG2(N); break;
case ISD::STRICT_FLOG10:
case ISD::FLOG10: R = SoftenFloatRes_FLOG10(N); break;
case ISD::STRICT_FMA:
case ISD::FMA: R = SoftenFloatRes_FMA(N); break;
case ISD::STRICT_FMUL:
case ISD::FMUL: R = SoftenFloatRes_FMUL(N); break;
case ISD::STRICT_FNEARBYINT:
case ISD::FNEARBYINT: R = SoftenFloatRes_FNEARBYINT(N); break;
case ISD::FNEG: R = SoftenFloatRes_FNEG(N); break;
case ISD::STRICT_FP_EXTEND:
case ISD::FP_EXTEND: R = SoftenFloatRes_FP_EXTEND(N); break;
case ISD::STRICT_FP_ROUND:
case ISD::FP_ROUND: R = SoftenFloatRes_FP_ROUND(N); break;
case ISD::FP16_TO_FP: R = SoftenFloatRes_FP16_TO_FP(N); break;
case ISD::STRICT_FPOW:
case ISD::FPOW: R = SoftenFloatRes_FPOW(N); break;
case ISD::STRICT_FPOWI:
case ISD::FPOWI: R = SoftenFloatRes_FPOWI(N); break;
case ISD::STRICT_FREM:
case ISD::FREM: R = SoftenFloatRes_FREM(N); break;
case ISD::STRICT_FRINT:
case ISD::FRINT: R = SoftenFloatRes_FRINT(N); break;
case ISD::STRICT_FROUND:
case ISD::FROUND: R = SoftenFloatRes_FROUND(N); break;
case ISD::STRICT_FROUNDEVEN:
case ISD::FROUNDEVEN: R = SoftenFloatRes_FROUNDEVEN(N); break;
case ISD::STRICT_FSIN:
case ISD::FSIN: R = SoftenFloatRes_FSIN(N); break;
case ISD::STRICT_FSQRT:
case ISD::FSQRT: R = SoftenFloatRes_FSQRT(N); break;
case ISD::STRICT_FSUB:
case ISD::FSUB: R = SoftenFloatRes_FSUB(N); break;
case ISD::STRICT_FTRUNC:
case ISD::FTRUNC: R = SoftenFloatRes_FTRUNC(N); break;
case ISD::LOAD: R = SoftenFloatRes_LOAD(N); break;
case ISD::ATOMIC_SWAP: R = BitcastToInt_ATOMIC_SWAP(N); break;
case ISD::SELECT: R = SoftenFloatRes_SELECT(N); break;
case ISD::SELECT_CC: R = SoftenFloatRes_SELECT_CC(N); break;
case ISD::FREEZE: R = SoftenFloatRes_FREEZE(N); break;
case ISD::STRICT_SINT_TO_FP:
case ISD::STRICT_UINT_TO_FP:
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP: R = SoftenFloatRes_XINT_TO_FP(N); break;
case ISD::UNDEF: R = SoftenFloatRes_UNDEF(N); break;
case ISD::VAARG: R = SoftenFloatRes_VAARG(N); break;
}
// If R is null, the sub-method took care of registering the result.
if (R.getNode()) {
assert(R.getNode() != N);
SetSoftenedFloat(SDValue(N, ResNo), R);
}
}
SDValue DAGTypeLegalizer::SoftenFloatRes_Unary(SDNode *N, RTLIB::Libcall LC) {
bool IsStrict = N->isStrictFPOpcode();
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
unsigned Offset = IsStrict ? 1 : 0;
assert(N->getNumOperands() == (1 + Offset) &&
"Unexpected number of operands!");
SDValue Op = GetSoftenedFloat(N->getOperand(0 + Offset));
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpVT = N->getOperand(0 + Offset).getValueType();
CallOptions.setTypeListBeforeSoften(OpVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Op,
CallOptions, SDLoc(N),
Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_Binary(SDNode *N, RTLIB::Libcall LC) {
bool IsStrict = N->isStrictFPOpcode();
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
unsigned Offset = IsStrict ? 1 : 0;
assert(N->getNumOperands() == (2 + Offset) &&
"Unexpected number of operands!");
SDValue Ops[2] = { GetSoftenedFloat(N->getOperand(0 + Offset)),
GetSoftenedFloat(N->getOperand(1 + Offset)) };
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpsVT[2] = { N->getOperand(0 + Offset).getValueType(),
N->getOperand(1 + Offset).getValueType() };
CallOptions.setTypeListBeforeSoften(OpsVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Ops,
CallOptions, SDLoc(N),
Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_BITCAST(SDNode *N) {
return BitConvertToInteger(N->getOperand(0));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FREEZE(SDNode *N) {
EVT Ty = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
return DAG.getNode(ISD::FREEZE, SDLoc(N), Ty,
GetSoftenedFloat(N->getOperand(0)));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_MERGE_VALUES(SDNode *N,
unsigned ResNo) {
SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
return BitConvertToInteger(Op);
}
SDValue DAGTypeLegalizer::SoftenFloatRes_BUILD_PAIR(SDNode *N) {
// Convert the inputs to integers, and build a new pair out of them.
return DAG.getNode(ISD::BUILD_PAIR, SDLoc(N),
TLI.getTypeToTransformTo(*DAG.getContext(),
N->getValueType(0)),
BitConvertToInteger(N->getOperand(0)),
BitConvertToInteger(N->getOperand(1)));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_ConstantFP(SDNode *N) {
ConstantFPSDNode *CN = cast<ConstantFPSDNode>(N);
// In ppcf128, the high 64 bits are always first in memory regardless
// of Endianness. LLVM's APFloat representation is not Endian sensitive,
// and so always converts into a 128-bit APInt in a non-Endian-sensitive
// way. However, APInt's are serialized in an Endian-sensitive fashion,
// so on big-Endian targets, the two doubles are output in the wrong
// order. Fix this by manually flipping the order of the high 64 bits
// and the low 64 bits here.
if (DAG.getDataLayout().isBigEndian() &&
CN->getValueType(0).getSimpleVT() == llvm::MVT::ppcf128) {
uint64_t words[2] = { CN->getValueAPF().bitcastToAPInt().getRawData()[1],
CN->getValueAPF().bitcastToAPInt().getRawData()[0] };
APInt Val(128, words);
return DAG.getConstant(Val, SDLoc(CN),
TLI.getTypeToTransformTo(*DAG.getContext(),
CN->getValueType(0)));
} else {
return DAG.getConstant(CN->getValueAPF().bitcastToAPInt(), SDLoc(CN),
TLI.getTypeToTransformTo(*DAG.getContext(),
CN->getValueType(0)));
}
}
SDValue DAGTypeLegalizer::SoftenFloatRes_EXTRACT_VECTOR_ELT(SDNode *N, unsigned ResNo) {
SDValue NewOp = BitConvertVectorToIntegerVector(N->getOperand(0));
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SDLoc(N),
NewOp.getValueType().getVectorElementType(),
NewOp, N->getOperand(1));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FABS(SDNode *N) {
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
unsigned Size = NVT.getSizeInBits();
// Mask = ~(1 << (Size-1))
APInt API = APInt::getAllOnesValue(Size);
API.clearBit(Size - 1);
SDValue Mask = DAG.getConstant(API, SDLoc(N), NVT);
SDValue Op = GetSoftenedFloat(N->getOperand(0));
return DAG.getNode(ISD::AND, SDLoc(N), NVT, Op, Mask);
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FMINNUM(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::FMIN_F32,
RTLIB::FMIN_F64,
RTLIB::FMIN_F80,
RTLIB::FMIN_F128,
RTLIB::FMIN_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FMAXNUM(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::FMAX_F32,
RTLIB::FMAX_F64,
RTLIB::FMAX_F80,
RTLIB::FMAX_F128,
RTLIB::FMAX_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FADD(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::ADD_F32,
RTLIB::ADD_F64,
RTLIB::ADD_F80,
RTLIB::ADD_F128,
RTLIB::ADD_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FCBRT(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::CBRT_F32,
RTLIB::CBRT_F64,
RTLIB::CBRT_F80,
RTLIB::CBRT_F128,
RTLIB::CBRT_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FCEIL(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::CEIL_F32,
RTLIB::CEIL_F64,
RTLIB::CEIL_F80,
RTLIB::CEIL_F128,
RTLIB::CEIL_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FCOPYSIGN(SDNode *N) {
SDValue LHS = GetSoftenedFloat(N->getOperand(0));
SDValue RHS = BitConvertToInteger(N->getOperand(1));
SDLoc dl(N);
EVT LVT = LHS.getValueType();
EVT RVT = RHS.getValueType();
unsigned LSize = LVT.getSizeInBits();
unsigned RSize = RVT.getSizeInBits();
// First get the sign bit of second operand.
SDValue SignBit = DAG.getNode(
ISD::SHL, dl, RVT, DAG.getConstant(1, dl, RVT),
DAG.getConstant(RSize - 1, dl,
TLI.getShiftAmountTy(RVT, DAG.getDataLayout())));
SignBit = DAG.getNode(ISD::AND, dl, RVT, RHS, SignBit);
// Shift right or sign-extend it if the two operands have different types.
int SizeDiff = RVT.getSizeInBits() - LVT.getSizeInBits();
if (SizeDiff > 0) {
SignBit =
DAG.getNode(ISD::SRL, dl, RVT, SignBit,
DAG.getConstant(SizeDiff, dl,
TLI.getShiftAmountTy(SignBit.getValueType(),
DAG.getDataLayout())));
SignBit = DAG.getNode(ISD::TRUNCATE, dl, LVT, SignBit);
} else if (SizeDiff < 0) {
SignBit = DAG.getNode(ISD::ANY_EXTEND, dl, LVT, SignBit);
SignBit =
DAG.getNode(ISD::SHL, dl, LVT, SignBit,
DAG.getConstant(-SizeDiff, dl,
TLI.getShiftAmountTy(SignBit.getValueType(),
DAG.getDataLayout())));
}
// Clear the sign bit of the first operand.
SDValue Mask = DAG.getNode(
ISD::SHL, dl, LVT, DAG.getConstant(1, dl, LVT),
DAG.getConstant(LSize - 1, dl,
TLI.getShiftAmountTy(LVT, DAG.getDataLayout())));
Mask = DAG.getNode(ISD::SUB, dl, LVT, Mask, DAG.getConstant(1, dl, LVT));
LHS = DAG.getNode(ISD::AND, dl, LVT, LHS, Mask);
// Or the value with the sign bit.
return DAG.getNode(ISD::OR, dl, LVT, LHS, SignBit);
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FCOS(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::COS_F32,
RTLIB::COS_F64,
RTLIB::COS_F80,
RTLIB::COS_F128,
RTLIB::COS_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FDIV(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::DIV_F32,
RTLIB::DIV_F64,
RTLIB::DIV_F80,
RTLIB::DIV_F128,
RTLIB::DIV_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FEXP(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::EXP_F32,
RTLIB::EXP_F64,
RTLIB::EXP_F80,
RTLIB::EXP_F128,
RTLIB::EXP_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FEXP2(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::EXP2_F32,
RTLIB::EXP2_F64,
RTLIB::EXP2_F80,
RTLIB::EXP2_F128,
RTLIB::EXP2_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FFLOOR(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::FLOOR_F32,
RTLIB::FLOOR_F64,
RTLIB::FLOOR_F80,
RTLIB::FLOOR_F128,
RTLIB::FLOOR_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FLOG(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::LOG_F32,
RTLIB::LOG_F64,
RTLIB::LOG_F80,
RTLIB::LOG_F128,
RTLIB::LOG_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FLOG2(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::LOG2_F32,
RTLIB::LOG2_F64,
RTLIB::LOG2_F80,
RTLIB::LOG2_F128,
RTLIB::LOG2_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FLOG10(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::LOG10_F32,
RTLIB::LOG10_F64,
RTLIB::LOG10_F80,
RTLIB::LOG10_F128,
RTLIB::LOG10_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FMA(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
unsigned Offset = IsStrict ? 1 : 0;
SDValue Ops[3] = { GetSoftenedFloat(N->getOperand(0 + Offset)),
GetSoftenedFloat(N->getOperand(1 + Offset)),
GetSoftenedFloat(N->getOperand(2 + Offset)) };
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpsVT[3] = { N->getOperand(0 + Offset).getValueType(),
N->getOperand(1 + Offset).getValueType(),
N->getOperand(2 + Offset).getValueType() };
CallOptions.setTypeListBeforeSoften(OpsVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG,
GetFPLibCall(N->getValueType(0),
RTLIB::FMA_F32,
RTLIB::FMA_F64,
RTLIB::FMA_F80,
RTLIB::FMA_F128,
RTLIB::FMA_PPCF128),
NVT, Ops, CallOptions, SDLoc(N), Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FMUL(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::MUL_F32,
RTLIB::MUL_F64,
RTLIB::MUL_F80,
RTLIB::MUL_F128,
RTLIB::MUL_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FNEARBYINT(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::NEARBYINT_F32,
RTLIB::NEARBYINT_F64,
RTLIB::NEARBYINT_F80,
RTLIB::NEARBYINT_F128,
RTLIB::NEARBYINT_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FNEG(SDNode *N) {
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
SDLoc dl(N);
// Expand Y = FNEG(X) -> Y = X ^ sign mask
APInt SignMask = APInt::getSignMask(NVT.getSizeInBits());
return DAG.getNode(ISD::XOR, dl, NVT, GetSoftenedFloat(N->getOperand(0)),
DAG.getConstant(SignMask, dl, NVT));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FP_EXTEND(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
SDValue Op = N->getOperand(IsStrict ? 1 : 0);
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
if (getTypeAction(Op.getValueType()) == TargetLowering::TypePromoteFloat) {
Op = GetPromotedFloat(Op);
// If the promotion did the FP_EXTEND to the destination type for us,
// there's nothing left to do here.
if (Op.getValueType() == N->getValueType(0))
return BitConvertToInteger(Op);
}
// There's only a libcall for f16 -> f32, so proceed in two stages. Also, it's
// entirely possible for both f16 and f32 to be legal, so use the fully
// hard-float FP_EXTEND rather than FP16_TO_FP.
if (Op.getValueType() == MVT::f16 && N->getValueType(0) != MVT::f32) {
if (IsStrict) {
Op = DAG.getNode(ISD::STRICT_FP_EXTEND, SDLoc(N),
{ MVT::f32, MVT::Other }, { Chain, Op });
Chain = Op.getValue(1);
} else {
Op = DAG.getNode(ISD::FP_EXTEND, SDLoc(N), MVT::f32, Op);
}
}
RTLIB::Libcall LC = RTLIB::getFPEXT(Op.getValueType(), N->getValueType(0));
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_EXTEND!");
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpVT = N->getOperand(IsStrict ? 1 : 0).getValueType();
CallOptions.setTypeListBeforeSoften(OpVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Op,
CallOptions, SDLoc(N),
Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
// FIXME: Should we just use 'normal' FP_EXTEND / FP_TRUNC instead of special
// nodes?
SDValue DAGTypeLegalizer::SoftenFloatRes_FP16_TO_FP(SDNode *N) {
EVT MidVT = TLI.getTypeToTransformTo(*DAG.getContext(), MVT::f32);
SDValue Op = N->getOperand(0);
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpsVT[1] = { N->getOperand(0).getValueType() };
CallOptions.setTypeListBeforeSoften(OpsVT, N->getValueType(0), true);
SDValue Res32 = TLI.makeLibCall(DAG, RTLIB::FPEXT_F16_F32, MidVT, Op,
CallOptions, SDLoc(N)).first;
if (N->getValueType(0) == MVT::f32)
return Res32;
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
RTLIB::Libcall LC = RTLIB::getFPEXT(MVT::f32, N->getValueType(0));
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_EXTEND!");
return TLI.makeLibCall(DAG, LC, NVT, Res32, CallOptions, SDLoc(N)).first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FP_ROUND(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
SDValue Op = N->getOperand(IsStrict ? 1 : 0);
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
RTLIB::Libcall LC = RTLIB::getFPROUND(Op.getValueType(), N->getValueType(0));
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_ROUND!");
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpVT = N->getOperand(IsStrict ? 1 : 0).getValueType();
CallOptions.setTypeListBeforeSoften(OpVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Op,
CallOptions, SDLoc(N),
Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FPOW(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::POW_F32,
RTLIB::POW_F64,
RTLIB::POW_F80,
RTLIB::POW_F128,
RTLIB::POW_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FPOWI(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
unsigned Offset = IsStrict ? 1 : 0;
assert(N->getOperand(1 + Offset).getValueType() == MVT::i32 &&
"Unsupported power type!");
RTLIB::Libcall LC = GetFPLibCall(N->getValueType(0),
RTLIB::POWI_F32,
RTLIB::POWI_F64,
RTLIB::POWI_F80,
RTLIB::POWI_F128,
RTLIB::POWI_PPCF128);
if (!TLI.getLibcallName(LC)) {
// Some targets don't have a powi libcall; use pow instead.
// FIXME: Implement this if some target needs it.
DAG.getContext()->emitError("Don't know how to soften fpowi to fpow");
return DAG.getUNDEF(N->getValueType(0));
}
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
SDValue Ops[2] = { GetSoftenedFloat(N->getOperand(0 + Offset)),
N->getOperand(1 + Offset) };
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
TargetLowering::MakeLibCallOptions CallOptions;
EVT OpsVT[2] = { N->getOperand(0 + Offset).getValueType(),
N->getOperand(1 + Offset).getValueType() };
CallOptions.setTypeListBeforeSoften(OpsVT, N->getValueType(0), true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Ops,
CallOptions, SDLoc(N),
Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FREM(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::REM_F32,
RTLIB::REM_F64,
RTLIB::REM_F80,
RTLIB::REM_F128,
RTLIB::REM_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FRINT(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::RINT_F32,
RTLIB::RINT_F64,
RTLIB::RINT_F80,
RTLIB::RINT_F128,
RTLIB::RINT_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FROUND(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::ROUND_F32,
RTLIB::ROUND_F64,
RTLIB::ROUND_F80,
RTLIB::ROUND_F128,
RTLIB::ROUND_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FROUNDEVEN(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::ROUNDEVEN_F32,
RTLIB::ROUNDEVEN_F64,
RTLIB::ROUNDEVEN_F80,
RTLIB::ROUNDEVEN_F128,
RTLIB::ROUNDEVEN_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FSIN(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::SIN_F32,
RTLIB::SIN_F64,
RTLIB::SIN_F80,
RTLIB::SIN_F128,
RTLIB::SIN_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FSQRT(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::SQRT_F32,
RTLIB::SQRT_F64,
RTLIB::SQRT_F80,
RTLIB::SQRT_F128,
RTLIB::SQRT_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FSUB(SDNode *N) {
return SoftenFloatRes_Binary(N, GetFPLibCall(N->getValueType(0),
RTLIB::SUB_F32,
RTLIB::SUB_F64,
RTLIB::SUB_F80,
RTLIB::SUB_F128,
RTLIB::SUB_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_FTRUNC(SDNode *N) {
return SoftenFloatRes_Unary(N, GetFPLibCall(N->getValueType(0),
RTLIB::TRUNC_F32,
RTLIB::TRUNC_F64,
RTLIB::TRUNC_F80,
RTLIB::TRUNC_F128,
RTLIB::TRUNC_PPCF128));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_LOAD(SDNode *N) {
LoadSDNode *L = cast<LoadSDNode>(N);
EVT VT = N->getValueType(0);
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
SDLoc dl(N);
auto MMOFlags =
L->getMemOperand()->getFlags() &
~(MachineMemOperand::MOInvariant | MachineMemOperand::MODereferenceable);
SDValue NewL;
if (L->getExtensionType() == ISD::NON_EXTLOAD) {
NewL = DAG.getLoad(L->getAddressingMode(), L->getExtensionType(), NVT, dl,
L->getChain(), L->getBasePtr(), L->getOffset(),
L->getPointerInfo(), NVT, L->getOriginalAlign(),
MMOFlags, L->getAAInfo());
// Legalized the chain result - switch anything that used the old chain to
// use the new one.
ReplaceValueWith(SDValue(N, 1), NewL.getValue(1));
return NewL;
}
// Do a non-extending load followed by FP_EXTEND.
NewL = DAG.getLoad(L->getAddressingMode(), ISD::NON_EXTLOAD, L->getMemoryVT(),
dl, L->getChain(), L->getBasePtr(), L->getOffset(),
L->getPointerInfo(), L->getMemoryVT(),
L->getOriginalAlign(), MMOFlags, L->getAAInfo());
// Legalized the chain result - switch anything that used the old chain to
// use the new one.
ReplaceValueWith(SDValue(N, 1), NewL.getValue(1));
auto ExtendNode = DAG.getNode(ISD::FP_EXTEND, dl, VT, NewL);
return BitConvertToInteger(ExtendNode);
}
SDValue DAGTypeLegalizer::SoftenFloatRes_SELECT(SDNode *N) {
SDValue LHS = GetSoftenedFloat(N->getOperand(1));
SDValue RHS = GetSoftenedFloat(N->getOperand(2));
return DAG.getSelect(SDLoc(N),
LHS.getValueType(), N->getOperand(0), LHS, RHS);
}
SDValue DAGTypeLegalizer::SoftenFloatRes_SELECT_CC(SDNode *N) {
SDValue LHS = GetSoftenedFloat(N->getOperand(2));
SDValue RHS = GetSoftenedFloat(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::SoftenFloatRes_UNDEF(SDNode *N) {
return DAG.getUNDEF(TLI.getTypeToTransformTo(*DAG.getContext(),
N->getValueType(0)));
}
SDValue DAGTypeLegalizer::SoftenFloatRes_VAARG(SDNode *N) {
SDValue Chain = N->getOperand(0); // Get the chain.
SDValue Ptr = N->getOperand(1); // Get the pointer.
EVT VT = N->getValueType(0);
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
SDLoc dl(N);
SDValue NewVAARG;
NewVAARG = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2),
N->getConstantOperandVal(3));
// Legalized the chain result - switch anything that used the old chain to
// use the new one.
if (N != NewVAARG.getValue(1).getNode())
ReplaceValueWith(SDValue(N, 1), NewVAARG.getValue(1));
return NewVAARG;
}
SDValue DAGTypeLegalizer::SoftenFloatRes_XINT_TO_FP(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
bool Signed = N->getOpcode() == ISD::SINT_TO_FP ||
N->getOpcode() == ISD::STRICT_SINT_TO_FP;
EVT SVT = N->getOperand(IsStrict ? 1 : 0).getValueType();
EVT RVT = N->getValueType(0);
EVT NVT = EVT();
SDLoc dl(N);
// If the input is not legal, eg: i1 -> fp, then it needs to be promoted to
// a larger type, eg: i8 -> fp. Even if it is legal, no libcall may exactly
// match. Look for an appropriate libcall.
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
for (unsigned t = MVT::FIRST_INTEGER_VALUETYPE;
t <= MVT::LAST_INTEGER_VALUETYPE && LC == RTLIB::UNKNOWN_LIBCALL; ++t) {
NVT = (MVT::SimpleValueType)t;
// The source needs to big enough to hold the operand.
if (NVT.bitsGE(SVT))
LC = Signed ? RTLIB::getSINTTOFP(NVT, RVT):RTLIB::getUINTTOFP (NVT, RVT);
}
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported XINT_TO_FP!");
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
// Sign/zero extend the argument if the libcall takes a larger type.
SDValue Op = DAG.getNode(Signed ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND, dl,
NVT, N->getOperand(IsStrict ? 1 : 0));
TargetLowering::MakeLibCallOptions CallOptions;
CallOptions.setSExt(Signed);
CallOptions.setTypeListBeforeSoften(SVT, RVT, true);
std::pair<SDValue, SDValue> Tmp =
TLI.makeLibCall(DAG, LC, TLI.getTypeToTransformTo(*DAG.getContext(), RVT),
Op, CallOptions, dl, Chain);
if (IsStrict)
ReplaceValueWith(SDValue(N, 1), Tmp.second);
return Tmp.first;
}
//===----------------------------------------------------------------------===//
// Convert Float Operand to Integer
//===----------------------------------------------------------------------===//
bool DAGTypeLegalizer::SoftenFloatOperand(SDNode *N, unsigned OpNo) {
LLVM_DEBUG(dbgs() << "Soften float operand " << OpNo << ": "; N->dump(&DAG);
dbgs() << "\n");
SDValue Res = SDValue();
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
dbgs() << "SoftenFloatOperand Op #" << OpNo << ": ";
N->dump(&DAG); dbgs() << "\n";
#endif
llvm_unreachable("Do not know how to soften this operator's operand!");
case ISD::BITCAST: Res = SoftenFloatOp_BITCAST(N); break;
case ISD::BR_CC: Res = SoftenFloatOp_BR_CC(N); break;
case ISD::FP_TO_FP16: // Same as FP_ROUND for softening purposes
case ISD::STRICT_FP_ROUND:
case ISD::FP_ROUND: Res = SoftenFloatOp_FP_ROUND(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 = SoftenFloatOp_FP_TO_XINT(N); break;
case ISD::STRICT_LROUND:
case ISD::LROUND: Res = SoftenFloatOp_LROUND(N); break;
case ISD::STRICT_LLROUND:
case ISD::LLROUND: Res = SoftenFloatOp_LLROUND(N); break;
case ISD::STRICT_LRINT:
case ISD::LRINT: Res = SoftenFloatOp_LRINT(N); break;
case ISD::STRICT_LLRINT:
case ISD::LLRINT: Res = SoftenFloatOp_LLRINT(N); break;
case ISD::SELECT_CC: Res = SoftenFloatOp_SELECT_CC(N); break;
case ISD::STRICT_FSETCC:
case ISD::STRICT_FSETCCS:
case ISD::SETCC: Res = SoftenFloatOp_SETCC(N); break;
case ISD::STORE: Res = SoftenFloatOp_STORE(N, OpNo); break;
case ISD::FCOPYSIGN: Res = SoftenFloatOp_FCOPYSIGN(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 to re-analyze.
if (Res.getNode() == N)
return true;
assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
"Invalid operand softening");
ReplaceValueWith(SDValue(N, 0), Res);
return false;
}
SDValue DAGTypeLegalizer::SoftenFloatOp_BITCAST(SDNode *N) {
SDValue Op0 = GetSoftenedFloat(N->getOperand(0));
return DAG.getNode(ISD::BITCAST, SDLoc(N), N->getValueType(0), Op0);
}
SDValue DAGTypeLegalizer::SoftenFloatOp_FP_ROUND(SDNode *N) {
// We actually deal with the partially-softened FP_TO_FP16 node too, which
// returns an i16 so doesn't meet the constraints necessary for FP_ROUND.
assert(N->getOpcode() == ISD::FP_ROUND || N->getOpcode() == ISD::FP_TO_FP16 ||
N->getOpcode() == ISD::STRICT_FP_ROUND);
bool IsStrict = N->isStrictFPOpcode();
SDValue Op = N->getOperand(IsStrict ? 1 : 0);
EVT SVT = Op.getValueType();
EVT RVT = N->getValueType(0);
EVT FloatRVT = N->getOpcode() == ISD::FP_TO_FP16 ? MVT::f16 : RVT;
RTLIB::Libcall LC = RTLIB::getFPROUND(SVT, FloatRVT);
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_ROUND libcall");
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
Op = GetSoftenedFloat(Op);
TargetLowering::MakeLibCallOptions CallOptions;
CallOptions.setTypeListBeforeSoften(SVT, RVT, true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, RVT, Op,
CallOptions, SDLoc(N),
Chain);
if (IsStrict) {
ReplaceValueWith(SDValue(N, 1), Tmp.second);
ReplaceValueWith(SDValue(N, 0), Tmp.first);
return SDValue();
}
return Tmp.first;
}
SDValue DAGTypeLegalizer::SoftenFloatOp_BR_CC(SDNode *N) {
SDValue NewLHS = N->getOperand(2), NewRHS = N->getOperand(3);
ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(1))->get();
EVT VT = NewLHS.getValueType();
NewLHS = GetSoftenedFloat(NewLHS);
NewRHS = GetSoftenedFloat(NewRHS);
TLI.softenSetCCOperands(DAG, VT, NewLHS, NewRHS, CCCode, SDLoc(N),
N->getOperand(2), N->getOperand(3));
// If softenSetCCOperands returned a scalar, we need to compare the result
// against zero to select between true and false values.
if (!NewRHS.getNode()) {
NewRHS = DAG.getConstant(0, SDLoc(N), NewLHS.getValueType());
CCCode = ISD::SETNE;
}
// Update N to have the operands specified.
return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
DAG.getCondCode(CCCode), NewLHS, NewRHS,
N->getOperand(4)),
0);
}
SDValue DAGTypeLegalizer::SoftenFloatOp_FP_TO_XINT(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
bool Signed = N->getOpcode() == ISD::FP_TO_SINT ||
N->getOpcode() == ISD::STRICT_FP_TO_SINT;
SDValue Op = N->getOperand(IsStrict ? 1 : 0);
EVT SVT = Op.getValueType();
EVT RVT = N->getValueType(0);
EVT NVT = EVT();
SDLoc dl(N);
// If the result is not legal, eg: fp -> i1, then it needs to be promoted to
// a larger type, eg: fp -> i32. Even if it is legal, no libcall may exactly
// match, eg. we don't have fp -> i8 conversions.
// Look for an appropriate libcall.
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE;
IntVT <= MVT::LAST_INTEGER_VALUETYPE && LC == RTLIB::UNKNOWN_LIBCALL;
++IntVT) {
NVT = (MVT::SimpleValueType)IntVT;
// The type needs to big enough to hold the result.
if (NVT.bitsGE(RVT))
LC = Signed ? RTLIB::getFPTOSINT(SVT, NVT) : RTLIB::getFPTOUINT(SVT, NVT);
}
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_TO_XINT!");
Op = GetSoftenedFloat(Op);
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
TargetLowering::MakeLibCallOptions CallOptions;
CallOptions.setTypeListBeforeSoften(SVT, RVT, true);
std::pair<SDValue, SDValue> Tmp = TLI.makeLibCall(DAG, LC, NVT, Op,
CallOptions, dl, Chain);
// Truncate the result if the libcall returns a larger type.
SDValue Res = DAG.getNode(ISD::TRUNCATE, dl, RVT, Tmp.first);
if (!IsStrict)
return Res;
ReplaceValueWith(SDValue(N, 1), Tmp.second);
ReplaceValueWith(SDValue(N, 0), Res);
return SDValue();
}
SDValue DAGTypeLegalizer::SoftenFloatOp_SELECT_CC(SDNode *N) {
SDValue NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(4))->get();
EVT VT = NewLHS.getValueType();
NewLHS = GetSoftenedFloat(NewLHS);
NewRHS = GetSoftenedFloat(NewRHS);
TLI.softenSetCCOperands(DAG, VT, NewLHS, NewRHS, CCCode, SDLoc(N),
N->getOperand(0), N->getOperand(1));
// If softenSetCCOperands returned a scalar, we need to compare the result
// against zero to select between true and false values.
if (!NewRHS.getNode()) {
NewRHS = DAG.getConstant(0, SDLoc(N), NewLHS.getValueType());
CCCode = ISD::SETNE;
}
// Update N to have the operands specified.
return SDValue(DAG.UpdateNodeOperands(N, NewLHS, NewRHS,
N->getOperand(2), N->getOperand(3),
DAG.getCondCode(CCCode)),
0);
}
SDValue DAGTypeLegalizer::SoftenFloatOp_SETCC(SDNode *N) {
bool IsStrict = N->isStrictFPOpcode();
SDValue Op0 = N->getOperand(IsStrict ? 1 : 0);
SDValue Op1 = N->getOperand(IsStrict ? 2 : 1);
SDValue Chain = IsStrict ? N->getOperand(0) : SDValue();
ISD::CondCode CCCode =
cast<CondCodeSDNode>(N->getOperand(IsStrict ? 3 : 2))->get();
EVT VT = Op0.getValueType();
SDValue NewLHS = GetSoftenedFloat(Op0);
SDValue NewRHS = GetSoftenedFloat(Op1);
TLI.softenSetCCOperands(DAG, VT, NewLHS, NewRHS, CCCode, SDLoc(N), Op0, Op1,
Chain, N->getOpcode() == ISD::STRICT_FSETCCS);
// Update N to have the operands specified.
if (NewRHS.getNode()) {
if (IsStrict)
NewLHS = DAG.getNode(ISD::SETCC, SDLoc(N), N->getValueType(0), NewLHS,
NewRHS, DAG.getCondCode(CCCode));
else
return SDValue(DAG.UpdateNodeOperands(N, NewLHS, NewRHS,
DAG.getCondCode(CCCode)), 0);
}
// Otherwise, softenSetCCOperands returned a scalar, use it.
assert((NewRHS.getNode() || NewLHS.getValueType() == N->getValueType(0)) &&
"Unexpected setcc expansion!");
if (IsStrict) {
ReplaceValueWith(SDValue(N, 0), NewLHS);
ReplaceValueWith(SDValue(N, 1), Chain);
return SDValue();
}
return NewLHS;
}
SDValue DAGTypeLegalizer::SoftenFloatOp_STORE(SDNode *N, unsigned OpNo) {
assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
assert(OpNo == 1 && "Can only soften the stored value!");
StoreSDNode *ST = cast<StoreSDNode>(N);