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[ConstantRange] Fix a couple cases where we were possibly throwing away an APInt allocation we could reuse. NFC 

This uses setAllBits to replace getMaxValue and operator=(uint64_t) instead of constructing an APInt from uint64_t.

llvm-svn: 301761
This commit is contained in:
Craig Topper 2017-04-30 00:44:05 +00:00
parent c12f10fe19
commit 866165309f
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/IR/ConstantRange.cpp
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@ -581,7 +581,7 @@ ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
return ConstantRange(DstTySize, /*isFullSet=*/true);
Union = ConstantRange(APInt::getMaxValue(DstTySize),Upper.trunc(DstTySize));
UpperDiv = APInt::getMaxValue(getBitWidth());
UpperDiv.setAllBits();
// Union covers the MaxValue case, so return if the remaining range is just
// MaxValue.
@ -837,7 +837,7 @@ ConstantRange::udiv(const ConstantRange &RHS) const {
if (RHS.getUpper() == 1)
RHS_umin = RHS.getLower();
else
RHS_umin = APInt(getBitWidth(), 1);
RHS_umin = 1;
}
APInt Upper = getUnsignedMax().udiv(RHS_umin) + 1;