From 7ff8330d1e159173f9ed3494b85b83cb97208ab5 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 14 Jun 2019 13:34:40 -0700
Subject: [PATCH] Leave breadcrumb behind

---
 backends/aiger/xaiger.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 4d8bb7f00..df970e341 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -185,6 +185,8 @@ struct XAigerWriter
 			if (!bit.wire->port_input)
 				unused_bits.erase(bit);
 
+		// TODO: Speed up toposort -- ultimately we care about
+		//       box ordering, but not individual AIG cells
 		dict<SigBit, pool<IdString>> bit_drivers, bit_users;
 		TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
 		bool abc_box_seen = false;
-- 
2.30.2