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Fix Transforms/InstCombine/2007-01-13-ExtCompareMiscompile.ll, which is part

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of PR1107


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33185 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-01-13 23:11:38 +00:00
parent ac3e76ca8f
commit a5c5e7715c
1 changed files with 13 additions and 3 deletions
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16
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -5263,9 +5263,19 @@ Instruction *InstCombiner::visitICmpInstWithCastAndCast(ICmpInst &ICI) {
RHSCIOp = CI->getOperand(0);
if (RHSCIOp->getType() != LHSCIOp->getType())
return 0;
else
// Okay, just insert a compare of the reduced operands now!
return new ICmpInst(ICI.getPredicate(), LHSCIOp, RHSCIOp);
// If the signedness of the two compares doesn't agree (i.e. one is a sext
// and the other is a zext), then we can't handle this.
if (CI->getOpcode() != LHSCI->getOpcode())
return 0;
// Likewise, if the signedness of the [sz]exts and the compare don't match,
// then we can't handle this.
if (isSignedExt != isSignedCmp && !ICI.isEquality())
return 0;
// Okay, just insert a compare of the reduced operands now!
return new ICmpInst(ICI.getPredicate(), LHSCIOp, RHSCIOp);
}
// If we aren't dealing with a constant on the RHS, exit early