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MemoryDependenceAnalysis: Consider a pointer clobbered if it is saved #142096

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MemoryDependenceAnalysis: Consider a pointer clobbered if it is saved #142096

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5 changes: 5 additions & 0 deletions llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -564,6 +564,11 @@ MemDepResult MemoryDependenceResults::getSimplePointerDependencyFrom(
if (!QueryInst || QueryInst->isVolatile())
return MemDepResult::getClobber(SI);

// If we store the pointer of QueryInst, it is danger due to that the address
// may be modified with other reference.
if (QueryInst && QueryInst->getOperand(0) == SI->getOperand(0))
return MemDepResult::getClobber(SI);

// If alias analysis can tell that this store is guaranteed to not modify
// the query pointer, ignore it. Use getModRefInfo to handle cases where
// the query pointer points to constant memory etc.
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