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Fix a crasher bug in my constant folding rewrite

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-01 01:23:19 +00:00
parent 338733fdd2
commit b97e2788ff
1 changed files with 10 additions and 3 deletions
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13
lib/VMCore/ConstantFold.cpp
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@ -625,11 +625,18 @@ static Instruction::BinaryOps evaluateRelation(const Constant *V1,
// If the first operand is simple, swap operands.
assert((isa<ConstantPointerRef>(V2) || isa<ConstantExpr>(V2)) &&
"Simple cases should have been handled by caller!");
return SetCondInst::getSwappedCondition(evaluateRelation(V2, V1));
Instruction::BinaryOps SwappedRelation = evaluateRelation(V2, V1);
if (SwappedRelation != Instruction::BinaryOpsEnd)
return SetCondInst::getSwappedCondition(SwappedRelation);
} else if (const ConstantPointerRef *CPR1 = dyn_cast<ConstantPointerRef>(V1)){
if (isa<ConstantExpr>(V2)) // Swap as necessary.
return SetCondInst::getSwappedCondition(evaluateRelation(V2, V1));
if (isa<ConstantExpr>(V2)) { // Swap as necessary.
Instruction::BinaryOps SwappedRelation = evaluateRelation(V2, V1);
if (SwappedRelation != Instruction::BinaryOpsEnd)
return SetCondInst::getSwappedCondition(SwappedRelation);
else
return Instruction::BinaryOpsEnd;
}
// Now we know that the RHS is a ConstantPointerRef or simple constant,
// which (since the types must match) means that it's a ConstantPointerNull.