Leave breadcrumb behind

diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 4d8bb7f00056efb81cb23dec3fcf310c93a8ec1b..df970e34192bf73b6ae2b30e29fc8b0757691399 100644 (file)
--- 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;