From 5c17f435a9c17b8146f79e1d2cfcb6e64b43b79d Mon Sep 17 00:00:00 2001
From: George Rennie <georgerennie@gmail.com>
Date: Wed, 20 Nov 2024 13:54:54 +0100
Subject: [PATCH] opt_merge: don't merge $barrier cells

---
 passes/opt/opt_merge.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/passes/opt/opt_merge.cc b/passes/opt/opt_merge.cc
index 003cfda37..8a00e7e8f 100644
--- a/passes/opt/opt_merge.cc
+++ b/passes/opt/opt_merge.cc
@@ -559,6 +559,7 @@ struct OptMergePass : public Pass {
 		ct.cell_types.erase(ID($anyconst));
 		ct.cell_types.erase(ID($allseq));
 		ct.cell_types.erase(ID($allconst));
+		ct.cell_types.erase(ID($barrier));
 
 		int total_count = 0;
 		for (auto module : design->selected_modules()) {