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[X86] combineOrShiftToFunnelShift - use getShiftAmountTy instead of hardwiring to MVT::i8

This commit is contained in:
Simon Pilgrim 2019-10-30 11:27:25 +00:00
parent e128c20864
commit 26655376fe
1 changed files with 8 additions and 5 deletions
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13
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -39597,6 +39597,7 @@ static SDValue combineOrShiftToFunnelShift(SDNode *N, SelectionDAG &DAG,
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
EVT VT = N->getValueType(0);
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (VT != MVT::i16 && VT != MVT::i32 && VT != MVT::i64)
return SDValue();
@ -39620,11 +39621,13 @@ static SDValue combineOrShiftToFunnelShift(SDNode *N, SelectionDAG &DAG,
if (!N0.hasOneUse() || !N1.hasOneUse())
return SDValue();
EVT ShiftVT = TLI.getShiftAmountTy(VT, DAG.getDataLayout());
SDValue ShAmt0 = N0.getOperand(1);
if (ShAmt0.getValueType() != MVT::i8)
if (ShAmt0.getValueType() != ShiftVT)
return SDValue();
SDValue ShAmt1 = N1.getOperand(1);
if (ShAmt1.getValueType() != MVT::i8)
if (ShAmt1.getValueType() != ShiftVT)
return SDValue();
// Peek through any modulo shift masks.
@ -39659,12 +39662,12 @@ static SDValue combineOrShiftToFunnelShift(SDNode *N, SelectionDAG &DAG,
std::swap(ShMsk0, ShMsk1);
}
auto GetFunnelShift = [&DAG, &DL, VT, Opc](SDValue Op0, SDValue Op1,
SDValue Amt) {
auto GetFunnelShift = [&DAG, &DL, VT, Opc, &ShiftVT](SDValue Op0, SDValue Op1,
SDValue Amt) {
if (Opc == ISD::FSHR)
std::swap(Op0, Op1);
return DAG.getNode(Opc, DL, VT, Op0, Op1,
DAG.getNode(ISD::TRUNCATE, DL, MVT::i8, Amt));
DAG.getNode(ISD::TRUNCATE, DL, ShiftVT, Amt));
};
// OR( SHL( X, C ), SRL( Y, 32 - C ) ) -> FSHL( X, Y, C )