diff options
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index e360177687b..1523d56cc4e 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -23319,7 +23319,8 @@ static SDValue getTargetVShiftByConstNode(unsigned Opc, const SDLoc &dl, MVT VT, for (unsigned i = 0; i != NumElts; ++i) { SDValue CurrentOp = SrcOp->getOperand(i); if (CurrentOp->isUndef()) { - Elts.push_back(CurrentOp); + // Must produce 0s in the correct bits. + Elts.push_back(DAG.getConstant(0, dl, ElementType)); continue; } auto *ND = cast<ConstantSDNode>(CurrentOp); @@ -23331,7 +23332,8 @@ static SDValue getTargetVShiftByConstNode(unsigned Opc, const SDLoc &dl, MVT VT, for (unsigned i = 0; i != NumElts; ++i) { SDValue CurrentOp = SrcOp->getOperand(i); if (CurrentOp->isUndef()) { - Elts.push_back(CurrentOp); + // Must produce 0s in the correct bits. + Elts.push_back(DAG.getConstant(0, dl, ElementType)); continue; } auto *ND = cast<ConstantSDNode>(CurrentOp); @@ -23343,7 +23345,8 @@ static SDValue getTargetVShiftByConstNode(unsigned Opc, const SDLoc &dl, MVT VT, for (unsigned i = 0; i != NumElts; ++i) { SDValue CurrentOp = SrcOp->getOperand(i); if (CurrentOp->isUndef()) { - Elts.push_back(CurrentOp); + // All shifted in bits must be the same so use 0. + Elts.push_back(DAG.getConstant(0, dl, ElementType)); continue; } auto *ND = cast<ConstantSDNode>(CurrentOp); |
