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[Attributor] - Cap accesses in AAPointerInfo #1807

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[Attributor] - Cap accesses in AAPointerInfo #1807

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92ac4c7
Add configurable access cap for AAPointerInfo to prevent O(N²) scaling
bhandarkar-pranav Mar 13, 2026
d637100
Set -attributor-max-pi-accesses in the attributor to 512 (for testing)
bhandarkar-pranav Mar 18, 2026
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9 changes: 9 additions & 0 deletions llvm/lib/Transforms/IPO/AttributorAttributes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,11 @@ static cl::opt<bool> ManifestInternal(

static cl::opt<int> MaxHeapToStackSize("max-heap-to-stack-size", cl::init(128),
cl::Hidden);
static cl::opt<unsigned> MaxAccessesPerAAPointerInfo(
"attributor-max-pi-accesses", cl::Hidden,
cl::desc("Maximum number of accesses in a single AAPointerInfo instance "
"before going pessimistic (0 = unlimited)"),
cl::init(512));

template <>
unsigned llvm::PotentialConstantIntValuesState::MaxPotentialValues = 0;
Expand Down Expand Up @@ -938,6 +943,10 @@ ChangeStatus AA::PointerInfo::State::addAccess(
Attributor &A, const AAPointerInfo::RangeList &Ranges, Instruction &I,
std::optional<Value *> Content, AAPointerInfo::AccessKind Kind, Type *Ty,
Instruction *RemoteI) {
if (MaxAccessesPerAAPointerInfo > 0 &&
AccessList.size() >= MaxAccessesPerAAPointerInfo)
return indicatePessimisticFixpoint();

RemoteI = RemoteI ? RemoteI : &I;

// Check if we have an access for this instruction, if not, simply add it.
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