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-rw-r--r--passes/opt/opt_clean.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/opt/opt_clean.cc b/passes/opt/opt_clean.cc
index 96c4c7a1..2ea60c03 100644
--- a/passes/opt/opt_clean.cc
+++ b/passes/opt/opt_clean.cc
@@ -47,7 +47,7 @@ static void rmunused_module_cells(RTLIL::Module *module, bool verbose)
wire2driver.insert(sig, cell);
}
}
- if (cell->type == "$memwr")
+ if (cell->type == "$memwr" || cell->attributes.count("\\keep"))
queue.insert(cell);
unused.insert(cell);
}