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Fix a minor logic mistake transforming compares in instcombine. PR12514.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156600 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2012-05-11 01:32:59 +00:00
parent 247c5ab07c
commit 5b6dfee28e
2 changed files with 16 additions and 1 deletions
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2
lib/Transforms/InstCombine/InstCombineCompares.cpp
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@@ -1035,7 +1035,7 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
if ((KnownZero|KnownOne).countLeadingOnes() >= SrcBits-DstBits) {
// Pull in the high bits from known-ones set.
APInt NewRHS = RHS->getValue().zext(SrcBits);
NewRHS |= KnownOne;
NewRHS |= KnownOne & APInt::getHighBitsSet(SrcBits, SrcBits-DstBits);
return new ICmpInst(ICI.getPredicate(), LHSI->getOperand(0),
ConstantInt::get(ICI.getContext(), NewRHS));
}