diff options
-rw-r--r-- | contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp b/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp index 032db2a80a77..a9a3343abc4d 100644 --- a/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -36195,7 +36195,11 @@ static SDValue combineX86ShuffleChain(ArrayRef<SDValue> Inputs, SDValue Root, (RootVT.is128BitVector() && Subtarget.hasVLX())) && (MaskEltSizeInBits > 8 || Subtarget.hasBWI()) && isSequentialOrUndefInRange(Mask, 0, NumMaskElts, 0, 2)) { - if (Depth == 0 && Root.getOpcode() == ISD::TRUNCATE) + // Bail if this was already a truncation or PACK node. + // We sometimes fail to match PACK if we demand known undef elements. + if (Depth == 0 && (Root.getOpcode() == ISD::TRUNCATE || + Root.getOpcode() == X86ISD::PACKSS || + Root.getOpcode() == X86ISD::PACKUS)) return SDValue(); // Nothing to do! ShuffleSrcVT = MVT::getIntegerVT(MaskEltSizeInBits * 2); ShuffleSrcVT = MVT::getVectorVT(ShuffleSrcVT, NumMaskElts / 2); |