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[Attributor][FIX] Fix NonNull deduction bug. #85810

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[Attributor][FIX] Fix NonNull deduction bug. #85810

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23 changes: 4 additions & 19 deletions llvm/lib/Transforms/IPO/AttributorAttributes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2425,6 +2425,8 @@ bool AANonNull::isImpliedByIR(Attributor &A, const IRPosition &IRP,
AttrKinds.push_back(Attribute::Dereferenceable);
if (A.hasAttr(IRP, AttrKinds, IgnoreSubsumingPositions, Attribute::NonNull))
return true;
if (IRP.getPositionKind() == IRP_RETURNED)
return false;

DominatorTree *DT = nullptr;
AssumptionCache *AC = nullptr;
Expand All @@ -2436,25 +2438,8 @@ bool AANonNull::isImpliedByIR(Attributor &A, const IRPosition &IRP,
}
}

SmallVector<AA::ValueAndContext> Worklist;
if (IRP.getPositionKind() != IRP_RETURNED) {
Worklist.push_back({IRP.getAssociatedValue(), IRP.getCtxI()});
} else {
bool UsedAssumedInformation = false;
if (!A.checkForAllInstructions(
[&](Instruction &I) {
Worklist.push_back({*cast<ReturnInst>(I).getReturnValue(), &I});
return true;
},
IRP.getAssociatedFunction(), nullptr, {Instruction::Ret},
UsedAssumedInformation))
return false;
}

if (llvm::any_of(Worklist, [&](AA::ValueAndContext VAC) {
return !isKnownNonZero(VAC.getValue(), A.getDataLayout(), 0, AC,
VAC.getCtxI(), DT);
}))
if (!isKnownNonZero(&IRP.getAssociatedValue(), A.getDataLayout(), 0, AC,
IRP.getCtxI(), DT))
return false;

A.manifestAttrs(IRP, {Attribute::get(IRP.getAnchorValue().getContext(),
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