diff options
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelDAGToDAG.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp index 3c4589ab18f..8f24f98be68 100644 --- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -1055,7 +1055,10 @@ static bool foldMaskAndShiftToScale(SelectionDAG &DAG, SDValue N, // Scale the leading zero count down based on the actual size of the value. // Also scale it down based on the size of the shift. - MaskLZ -= (64 - X.getSimpleValueType().getSizeInBits()) + ShiftAmt; + unsigned ScaleDown = (64 - X.getSimpleValueType().getSizeInBits()) + ShiftAmt; + if (MaskLZ < ScaleDown) + return true; + MaskLZ -= ScaleDown; // The final check is to ensure that any masked out high bits of X are // already known to be zero. Otherwise, the mask has a semantic impact |
