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Use APInt::getOneBitSet instead of APInt::getBitsSet for sign bit mask creation

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Avoids all the unnecessary extra bitrange creation/shift stages.

llvm-svn: 296879
This commit is contained in:
Simon Pilgrim 2017-03-03 16:35:57 +00:00
parent a5bf3341f1
commit 0055010fcf
1 changed files with 1 additions and 1 deletions
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lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1099,7 +1099,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
EVT InVT = Op.getOperand(0).getValueType();
unsigned InBits = InVT.getScalarSizeInBits();
APInt InMask = APInt::getLowBitsSet(BitWidth, InBits);
APInt InSignBit = APInt::getBitsSet(BitWidth, InBits - 1, InBits);
APInt InSignBit = APInt::getOneBitSet(BitWidth, InBits - 1);
APInt NewBits = ~InMask & NewMask;
// If none of the top bits are demanded, convert this into an any_extend.