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-rw-r--r--passes/hierarchy/hierarchy.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index b80f0d49..287f9309 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -152,6 +152,7 @@ static bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool fla
RTLIL::Module *mod = design->modules[cell->type];
cell->type = mod->derive(design, cell->parameters);
cell->parameters.clear();
+ did_something = true;
}
if (did_something)