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-rw-r--r--passes/hierarchy/hierarchy.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index d71e9c574..41c1cfded 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -640,6 +640,9 @@ struct HierarchyPass : public Pass {
if (w == nullptr || w->port_id == 0)
continue;
+ if (GetSize(conn.second) == 0)
+ continue;
+
if (GetSize(w) == GetSize(conn.second))
continue;