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[LegalizeTypes] In SoftenFloatRes_FNEG, always generate integer arithmetic, never fall back to using fsub. 

We would previously fallback if the type wasn't f32/f64/f128. But
I don't think any of the other floating point types ever go through
the softening code anyway. So this code is dead.
This commit is contained in:
Craig Topper 2019-11-28 11:36:55 -08:00
parent 2485fa7739
commit 68ddf434c0
1 changed files with 4 additions and 19 deletions
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23
llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
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@ -452,25 +452,10 @@ SDValue DAGTypeLegalizer::SoftenFloatRes_FNEG(SDNode *N) {
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
SDLoc dl(N);
EVT FloatVT = N->getValueType(0);
if (FloatVT == MVT::f32 || FloatVT == MVT::f64 || FloatVT == MVT::f128) {
// 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));
}
// Expand Y = FNEG(X) -> Y = SUB -0.0, X
SDValue Ops[2] = { DAG.getConstantFP(-0.0, dl, N->getValueType(0)),
GetSoftenedFloat(N->getOperand(0)) };
TargetLowering::MakeLibCallOptions CallOptions;
return TLI.makeLibCall(DAG, GetFPLibCall(N->getValueType(0),
RTLIB::SUB_F32,
RTLIB::SUB_F64,
RTLIB::SUB_F80,
RTLIB::SUB_F128,
RTLIB::SUB_PPCF128),
NVT, Ops, CallOptions, dl).first;
// 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) {