diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 72743a97abd..61828759fc2 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -7980,7 +7980,7 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const { return SDValue(); } -// This function assumes its argument is a BUILD_VECTOR of constand or +// This function assumes its argument is a BUILD_VECTOR of constants or // undef SDNodes. i.e: ISD::isBuildVectorOfConstantSDNodes(BuildVector) is // true. static bool BUILD_VECTORtoBlendMask(BuildVectorSDNode *BuildVector, @@ -8004,9 +8004,13 @@ static bool BUILD_VECTORtoBlendMask(BuildVectorSDNode *BuildVector, Lane2Cond = !isZero(SndLaneEltCond); if (Lane1Cond == Lane2Cond || Lane2Cond < 0) - MaskValue |= !!Lane1Cond << i; + // Lane1Cond != 0, means we want the first argument. + // Lane1Cond == 0, means we want the second argument. + // The encoding of this argument is 0 for the first argument, 1 + // for the second. Therefore, invert the condition. + MaskValue |= !Lane1Cond << i; else if (Lane1Cond < 0) - MaskValue |= !!Lane2Cond << i; + MaskValue |= !Lane2Cond << i; else return false; } |
