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-rw-r--r--llvm/include/llvm/Support/GenericDomTreeConstruction.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/include/llvm/Support/GenericDomTreeConstruction.h b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
index 61fc72de443..7c065f93925 100644
--- a/llvm/include/llvm/Support/GenericDomTreeConstruction.h
+++ b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
@@ -260,6 +260,7 @@ void Calculate(DominatorTreeBase<typename GraphTraits<NodeT>::NodeType>& DT,
for (unsigned i = 2; i <= N; ++i) {
typename GraphT::NodeType* W = DT.Vertex[i];
+ // Don't replace this with 'count', the insertion side effect is important
if (DT.DomTreeNodes[W])
continue; // Haven't calculated this node yet?
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