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[x86] don't create an unused constant vector 

Noticed while scanning through debug spew. Creating unused
nodes is inefficient and makes following the debug output harder.
This commit is contained in:
Sanjay Patel 2020-02-07 11:49:36 -05:00
parent c96001035d
commit de6f7eb47e
1 changed files with 6 additions and 5 deletions
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9
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -16100,13 +16100,14 @@ static SDValue lowerV8F32Shuffle(const SDLoc &DL, ArrayRef<int> Mask,
// If we have a single input shuffle with different shuffle patterns in the
// two 128-bit lanes use the variable mask to VPERMILPS.
if (V2.isUndef()) {
if (!is128BitLaneCrossingShuffleMask(MVT::v8f32, Mask)) {
SDValue VPermMask = getConstVector(Mask, MVT::v8i32, DAG, DL, true);
if (!is128BitLaneCrossingShuffleMask(MVT::v8f32, Mask))
return DAG.getNode(X86ISD::VPERMILPV, DL, MVT::v8f32, V1, VPermMask);
if (Subtarget.hasAVX2())
}
if (Subtarget.hasAVX2()) {
SDValue VPermMask = getConstVector(Mask, MVT::v8i32, DAG, DL, true);
return DAG.getNode(X86ISD::VPERMV, DL, MVT::v8f32, VPermMask, V1);
}
// Otherwise, fall back.
return lowerShuffleAsLanePermuteAndShuffle(DL, MVT::v8f32, V1, V2, Mask,
DAG, Subtarget);