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[X86][AVX] lowerV2X128Shuffle - use getBROADCAST_LOAD helper. NFCI.

This commit is contained in:
Simon Pilgrim 2021-11-02 12:52:05 +00:00
parent 7999355106
commit 8ca666a280
1 changed files with 5 additions and 14 deletions
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17
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -16432,21 +16432,12 @@ static SDValue lowerV2X128Shuffle(const SDLoc &DL, MVT VT, SDValue V1,
bool SplatHi = isShuffleEquivalent(Mask, {2, 3, 2, 3}, V1);
if ((SplatLo || SplatHi) && !Subtarget.hasAVX512() && V1.hasOneUse() &&
X86::mayFoldLoad(peekThroughOneUseBitcasts(V1), Subtarget)) {
auto *Ld = cast<LoadSDNode>(peekThroughOneUseBitcasts(V1));
if (!Ld->isNonTemporal()) {
MVT MemVT = VT.getHalfNumVectorElementsVT();
unsigned Ofs = SplatLo ? 0 : MemVT.getStoreSize();
SDVTList Tys = DAG.getVTList(VT, MVT::Other);
SDValue Ptr = DAG.getMemBasePlusOffset(Ld->getBasePtr(),
TypeSize::Fixed(Ofs), DL);
SDValue Ops[] = {Ld->getChain(), Ptr};
SDValue BcastLd = DAG.getMemIntrinsicNode(
X86ISD::SUBV_BROADCAST_LOAD, DL, Tys, Ops, MemVT,
DAG.getMachineFunction().getMachineMemOperand(
Ld->getMemOperand(), Ofs, MemVT.getStoreSize()));
DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), BcastLd.getValue(1));
return BcastLd;
}
auto *Ld = cast<LoadSDNode>(peekThroughOneUseBitcasts(V1));
if (SDValue BcstLd = getBROADCAST_LOAD(X86ISD::SUBV_BROADCAST_LOAD, DL,
VT, MemVT, Ld, Ofs, DAG))
return BcstLd;
}
// With AVX2, use VPERMQ/VPERMPD for unary shuffles to allow memory folding.