diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 76cf425..f8e1fea 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1437,12 +1437,10 @@ void SelectionDAG::ComputeMaskedBits(SDOperand Op, const APInt &Mask, // We know that the top bits of C-X are clear if X contains less bits // than C (i.e. no wrap-around can happen). For example, 20-X is // positive if we can prove that X is >= 0 and < 16. - - // sign bit clear if (CLHS->getAPIntValue().isNonNegative()) { unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros(); // NLZ can't be BitWidth with no sign bit - APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ); + APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1); ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero, KnownOne, Depth+1); // If all of the MaskV bits are known to be zero, then we know the output |