diff options
Diffstat (limited to 'lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 4ebe4caad0..2ae607c182 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -2393,6 +2393,8 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) { bool V2IsUndef = V2.getOpcode() == ISD::UNDEF; if (isSplatMask(PermMask.Val)) { + if (ISD::isBuildVectorAllZeros(V1.Val) || ISD::isBuildVectorAllOnes(V1.Val)) + return V1; if (NumElems <= 4) return Op; // Promote it to a v4i32 splat. return PromoteSplat(Op, DAG); |