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[DebugInfo][Mem2Reg] Assign uninitialized values with annotated locs #157716

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Merged
merged 1 commit into from
Sep 10, 2025
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[DebugInfo][Mem2Reg] Assign uninitialized values with annotated locs #157716

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7 changes: 5 additions & 2 deletions llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -849,9 +849,12 @@ void PromoteMem2Reg::run() {
for (unsigned i = 0, e = Allocas.size(); i != e; ++i)
IncomingVals.init(i, UndefValue::get(Allocas[i]->getAllocatedType()));

// When handling debug info, treat all incoming values as if they have unknown
// locations until proven otherwise.
// When handling debug info, treat all incoming values as if they have
// compiler-generated (empty) locations, representing the uninitialized
// alloca, until proven otherwise.
IncomingLocs.resize(Allocas.size());
for (unsigned i = 0, e = Allocas.size(); i != e; ++i)
IncomingLocs.init(i, DebugLoc::getCompilerGenerated());

// The renamer uses the Visited set to avoid infinite loops.
Visited.resize(F.getMaxBlockNumber(), false);
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