diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 49608d7c28a..1c9ee5d3ce6 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -14269,8 +14269,16 @@ static SDValue lowerV16I8Shuffle(const SDLoc &DL, ArrayRef<int> Mask, DAG.getUNDEF(MVT::v8i16), PreDupI16Shuffle)); // Unpack the bytes to form the i16s that will be shuffled into place. + bool EvenInUse = false, OddInUse = false; + for (int i = 0; i < 16; i += 2) { + EvenInUse |= (Mask[i + 0] >= 0); + OddInUse |= (Mask[i + 1] >= 0); + if (EvenInUse && OddInUse) + break; + } V1 = DAG.getNode(TargetLo ? X86ISD::UNPCKL : X86ISD::UNPCKH, DL, - MVT::v16i8, V1, V1); + MVT::v16i8, EvenInUse ? V1 : DAG.getUNDEF(MVT::v16i8), + OddInUse ? V1 : DAG.getUNDEF(MVT::v16i8)); int PostDupI16Shuffle[8] = {-1, -1, -1, -1, -1, -1, -1, -1}; for (int i = 0; i < 16; ++i) |
