diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index fbb78e3eafc..7f0c285043e 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -12838,9 +12838,10 @@ static SDValue lowerV8I32VectorShuffle(const SDLoc &DL, ArrayRef<int> Mask, // For non-AVX512 if the Mask is of 16bit elements in lane then try to split // since after split we get a more efficient code than vblend by using // vpunpcklwd and vpunpckhwd instrs. - if (isUnpackWdShuffleMask(Mask, MVT::v8i32) && !Subtarget.hasAVX512()) - if (SDValue V = lowerVectorShuffleAsSplitOrBlend(DL, MVT::v8i32, V1, V2, - Mask, DAG)) + if (isUnpackWdShuffleMask(Mask, MVT::v8i32) && !V2.isUndef() && + !Subtarget.hasAVX512()) + if (SDValue V = + lowerVectorShuffleAsSplitOrBlend(DL, MVT::v8i32, V1, V2, Mask, DAG)) return V; if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8i32, V1, V2, Mask, |
