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Don't collect from phi nodes which are not fully constructed yet #140806

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Don't collect from phi nodes which are not fully constructed yet #140806

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4 changes: 3 additions & 1 deletion llvm/lib/Analysis/ScalarEvolution.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15823,7 +15823,9 @@ void ScalarEvolution::LoopGuards::collectFromBlock(
Depth < MaxLoopGuardCollectionDepth) {
SmallDenseMap<const BasicBlock *, LoopGuards> IncomingGuards;
for (auto &Phi : Pair.second->phis())
collectFromPHI(SE, Guards, Phi, VisitedBlocks, IncomingGuards, Depth);
// We don't collect from PHIs that are under construction.
if (Pair.second->hasNPredecessors(Phi.getNumIncomingValues()))
collectFromPHI(SE, Guards, Phi, VisitedBlocks, IncomingGuards, Depth);
}

// Now apply the information from the collected conditions to
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