From a6d4ea74634826741f09793c36d596f2fa239f62 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Mon, 13 Jan 2020 19:21:11 -0800
Subject: abc9: respect (* keep *) on cells

---
 passes/techmap/abc9_ops.cc | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'passes')

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"))
-- 
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