rsmith added a comment.
Based on the ASan output, it looks like the miscompile is probably happening in
`SparseSolver<LatticeKey, LatticeVal, KeyInfo>::getValueState(LatticeKey)` at
around include/llvm/Analysis/SparsePropagation.h:240:
template <class LatticeKey, class LatticeVal, class KeyInfo>
LatticeVal
SparseSolver<LatticeKey, LatticeVal, KeyInfo>::getValueState(LatticeKey Key) {
auto I = ValueState.find(Key);
if (I != ValueState.end())
return I->second; // Common case, in the map
if (LatticeFunc->IsUntrackedValue(Key))
return LatticeFunc->getUntrackedVal();
LatticeVal LV = LatticeFunc->ComputeLatticeVal(Key);
// If this value is untracked, don't add it to the map.
if (LV == LatticeFunc->getUntrackedVal())
return LV;
return ValueState[Key] = LV;
}
I'm guessing we somehow get confused about whether `LV` is an NRVO variable
during template instantiation, and apply NRVO to it despite there being a
return of something else in its scope.
Repository:
rC Clang
https://reviews.llvm.org/D47067
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