diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index c861762d16..c79045b885 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -154,6 +154,11 @@ bool TargetLowering::MaskedValueIsZero(const SDOperand &Op, case ISD::ZERO_EXTEND: SrcBits = MVT::getSizeInBits(Op.getOperand(0).getValueType()); return MaskedValueIsZero(Op.getOperand(0),Mask & (~0ULL >> (64-SrcBits))); + case ISD::ANY_EXTEND: + // If the mask only includes bits in the low part, recurse. + SrcBits = MVT::getSizeInBits(Op.getOperand(0).getValueType()); + if (Mask >> SrcBits) return false; // Use of unknown top bits. + return MaskedValueIsZero(Op.getOperand(0), Mask); case ISD::AssertZext: SrcBits = MVT::getSizeInBits(cast<VTSDNode>(Op.getOperand(1))->getVT()); return (Mask & ((1ULL << SrcBits)-1)) == 0; // Returning only the zext bits. |