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-rw-r--r--passes/fsm/fsm_expand.cc5
1 files changed, 4 insertions, 1 deletions
diff --git a/passes/fsm/fsm_expand.cc b/passes/fsm/fsm_expand.cc
index df3aec85..0446c113 100644
--- a/passes/fsm/fsm_expand.cc
+++ b/passes/fsm/fsm_expand.cc
@@ -42,6 +42,9 @@ struct FsmExpand
bool is_cell_merge_candidate(RTLIL::Cell *cell)
{
+ if (cell->type == "$mux" || cell->type == "$pmux" || cell->type == "$safe_pmux")
+ return cell->connections.at("\\A").width < 2;
+
RTLIL::SigSpec new_signals;
if (cell->connections.count("\\A") > 0)
new_signals.append(assign_map(cell->connections["\\A"]));
@@ -137,7 +140,7 @@ struct FsmExpand
input_sig.sort_and_unify();
input_sig.remove_const();
- assert(input_sig.width <= 4);
+ assert(input_sig.width <= 4 || cell->type == "$mux" || cell->type == "$pmux" || cell->type == "$safe_pmux");
std::vector<RTLIL::Const> truth_tab;
for (int i = 0; i < (1 << input_sig.width); i++) {