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Add a check missing from my last commit and avoid a potential overflow situation. 

llvm-svn: 122258
This commit is contained in:
Benjamin Kramer 2010-12-20 20:00:31 +00:00
parent 8e37ea1a29
commit f7957d0463
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -1449,13 +1449,13 @@ Value *InstCombiner::FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
}
}
// (icmp ult (X + CA), C1) | (icmp eq X, C2) -> (icmp ult (X + CA), C1 + 1)
// (icmp ult (X + CA), C1) | (icmp eq X, C2) -> (icmp ule (X + CA), C1)
// iff C2 + CA == C1.
if (LHSCC == ICmpInst::ICMP_ULT) {
if (LHSCC == ICmpInst::ICMP_ULT && RHSCC == ICmpInst::ICMP_EQ) {
ConstantInt *AddCst;
if (match(Val, m_Add(m_Specific(Val2), m_ConstantInt(AddCst))))
if (RHSCst->getValue() + AddCst->getValue() == LHSCst->getValue())
return Builder->CreateICmp(LHSCC, Val, AddOne(LHSCst));
return Builder->CreateICmpULE(Val, LHSCst);
}
// From here on, we only handle: