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-rw-r--r--backends/smt2/smt2.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index 3b3585b59..1ab39a405 100644
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -998,7 +998,7 @@ struct Smt2Worker
if (contains_clock && GetSize(wire) == 1 && (clock_posedge.count(sig) || clock_negedge.count(sig)))
comments.push_back(stringf("; yosys-smt2-clock %s%s%s\n", get_id(wire),
clock_posedge.count(sig) ? " posedge" : "", clock_negedge.count(sig) ? " negedge" : ""));
- if (contains_clock) {
+ if (wire->port_input && contains_clock) {
for (int i = 0; i < GetSize(sig); i++) {
bool is_posedge = clock_posedge.count(sig[i]);
bool is_negedge = clock_negedge.count(sig[i]);