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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-03-29 13:00:00 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-03-29 13:00:00 +0000 |
| commit | 2845189bd1eac5573b657fa07cbba34d23f255e8 (patch) | |
| tree | d3598d22abb2e581a9a679ff11af14c9b48309c0 /llvm/lib | |
| parent | 92d7fceb41b5502da1ef8b38b514bcd19075c2b5 (diff) | |
| download | bcm5719-llvm-2845189bd1eac5573b657fa07cbba34d23f255e8.tar.gz bcm5719-llvm-2845189bd1eac5573b657fa07cbba34d23f255e8.zip | |
[X86][AVX2] Prevent unary interleaving patterns from calling lowerVectorShuffleAsSplitOrBlend (PR32453)
llvm-svn: 298993
Diffstat (limited to 'llvm/lib')
| -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, |
