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-rw-r--r--passes/techmap/abc9_ops.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/passes/techmap/abc9_ops.cc b/passes/techmap/abc9_ops.cc
index cc22fd474..9cc58c99d 100644
--- a/passes/techmap/abc9_ops.cc
+++ b/passes/techmap/abc9_ops.cc
@@ -489,6 +489,8 @@ void reintegrate(RTLIL::Module *module)
std::vector<Cell*> boxes;
for (auto cell : module->cells().to_vector()) {
+ if (cell->has_keep_attr())
+ continue;
if (cell->type.in(ID($_AND_), ID($_NOT_), ID($__ABC9_FF_)))
module->remove(cell);
else if (cell->attributes.erase("\\abc9_box_seq"))