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Catch ~x < cst just like ~x < ~y, we currently handle this through

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means that are about to disappear.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-01-15 05:41:33 +00:00
parent 28621cb36f
commit fdb5b01df4
1 changed files with 8 additions and 4 deletions
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12
lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -2284,11 +2284,15 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
}
}
// ~x < ~y --> y < x
{ Value *A, *B;
if (match(Op0, m_Not(m_Value(A))) &&
match(Op1, m_Not(m_Value(B))))
return new ICmpInst(I.getPredicate(), B, A);
// ~x < ~y --> y < x
// ~x < cst --> ~cst < x
if (match(Op0, m_Not(m_Value(A)))) {
if (match(Op1, m_Not(m_Value(B))))
return new ICmpInst(I.getPredicate(), B, A);
if (ConstantInt *RHSC = dyn_cast<ConstantInt>(B))
return new ICmpInst(I.getPredicate(), ConstantExpr::getNot(RHSC), A);
}
// (a+b) <u a --> llvm.uadd.with.overflow.
// (a+b) <u b --> llvm.uadd.with.overflow.