From d51ecde8c2e488fc299d6033bbc18202ee5058de Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Sun, 29 Nov 2020 16:33:45 +0000
Subject: [PATCH] clean: keep $print cells, since they have unmodelled side
 effects.

---
 passes/opt/opt_clean.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/passes/opt/opt_clean.cc b/passes/opt/opt_clean.cc
index cb2490dc7..4da67cf63 100644
--- a/passes/opt/opt_clean.cc
+++ b/passes/opt/opt_clean.cc
@@ -79,6 +79,9 @@ struct keep_cache_t
 		if (!ignore_specify && cell->type.in(ID($specify2), ID($specify3), ID($specrule)))
 			return true;
 
+		if (cell->type == ID($print))
+			return true;
+
 		if (cell->has_keep_attr())
 			return true;