diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp index d3ccdcd5ffd..753e5281bfc 100644 --- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -791,6 +791,9 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op, // TODO: Should we check for other forms of sign-bit comparisons? // Examples: X <= -1, X >= 0 } + if (getBooleanContents(Op.getOperand(0).getValueType()) == + BooleanContent::ZeroOrOneBooleanContent && BitWidth > 1) + KnownZero.setBitsFrom(1); break; } case ISD::SHL: |
