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[InstCombine] Use APInt::getBitsSetFrom instead of inverting the result of getLowBitsSet. NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2017-04-13 21:49:48 +00:00
parent ed85367738
commit e7866ab180
1 changed files with 2 additions and 4 deletions
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6
lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -3810,16 +3810,14 @@ static APInt getDemandedBitsLHSMask(ICmpInst &I, unsigned BitWidth,
// greater than the RHS must differ in a bit higher than these due to carry.
case ICmpInst::ICMP_UGT: {
unsigned trailingOnes = RHS.countTrailingOnes();
APInt lowBitsSet = APInt::getLowBitsSet(BitWidth, trailingOnes);
return ~lowBitsSet;
return APInt::getBitsSetFrom(BitWidth, trailingOnes);
}
// Similarly, for a ULT comparison, we don't care about the trailing zeros.
// Any value less than the RHS must differ in a higher bit because of carries.
case ICmpInst::ICMP_ULT: {
unsigned trailingZeros = RHS.countTrailingZeros();
APInt lowBitsSet = APInt::getLowBitsSet(BitWidth, trailingZeros);
return ~lowBitsSet;
return APInt::getBitsSetFrom(BitWidth, trailingZeros);
}
default: