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[ConstFold] Slightly clean up icmp of two geps fold (NFC)

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As we're only dealing with one type of constant expression here,
try to directly cast to GEPOperator.
This commit is contained in:
Nikita Popov 2022-01-04 12:33:38 +01:00
parent 75db002725
commit 1379eb5776
1 changed files with 11 additions and 20 deletions
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31
llvm/lib/IR/ConstantFold.cpp
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@ -1553,26 +1553,17 @@ static ICmpInst::Predicate evaluateICmpRelation(Constant *V1, Constant *V2,
return ICmpInst::BAD_ICMP_PREDICATE;
}
}
} else {
ConstantExpr *CE2 = cast<ConstantExpr>(V2);
Constant *CE2Op0 = CE2->getOperand(0);
// There are MANY other foldings that we could perform here. They will
// probably be added on demand, as they seem needed.
switch (CE2->getOpcode()) {
default: break;
case Instruction::GetElementPtr:
// By far the most common case to handle is when the base pointers are
// obviously to the same global.
if (isa<GlobalValue>(CE1Op0) && isa<GlobalValue>(CE2Op0)) {
// Don't know relative ordering, but check for inequality.
if (CE1Op0 != CE2Op0) {
GEPOperator *CE2GEP = cast<GEPOperator>(CE2);
if (CE1GEP->hasAllZeroIndices() && CE2GEP->hasAllZeroIndices())
return areGlobalsPotentiallyEqual(cast<GlobalValue>(CE1Op0),
cast<GlobalValue>(CE2Op0));
return ICmpInst::BAD_ICMP_PREDICATE;
}
} else if (const auto *CE2GEP = dyn_cast<GEPOperator>(V2)) {
// By far the most common case to handle is when the base pointers are
// obviously to the same global.
const Constant *CE2Op0 = cast<Constant>(CE2GEP->getPointerOperand());
if (isa<GlobalValue>(CE1Op0) && isa<GlobalValue>(CE2Op0)) {
// Don't know relative ordering, but check for inequality.
if (CE1Op0 != CE2Op0) {
if (CE1GEP->hasAllZeroIndices() && CE2GEP->hasAllZeroIndices())
return areGlobalsPotentiallyEqual(cast<GlobalValue>(CE1Op0),
cast<GlobalValue>(CE2Op0));
return ICmpInst::BAD_ICMP_PREDICATE;
}
}
}