From 419ca5c207087a1f39d8ec707ec1b94e3a481919 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Wed, 27 Nov 2019 21:55:56 -0800
Subject: [PATCH] Revert "Fold loop"

This reverts commit a30d5e1cc35791a98b2269c5e587c566fe8b0a35.
---
 backends/aiger/xaiger.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index a77949b4f..627133314 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -174,7 +174,6 @@ struct XAigerWriter
 					if (bit != wirebit)
 						alias_map[bit] = wirebit;
 					input_bits.insert(wirebit);
-					undriven_bits.erase(bit);
 				}
 
 				if (wire->port_output || keep) {
@@ -182,8 +181,6 @@ struct XAigerWriter
 						if (bit != wirebit)
 							alias_map[wirebit] = bit;
 						output_bits.insert(wirebit);
-						if (!wire->port_input)
-							unused_bits.erase(bit);
 					}
 					else
 						log_debug("Skipping PO '%s' driven by 1'bx\n", log_signal(wirebit));
@@ -191,6 +188,12 @@ struct XAigerWriter
 			}
 		}
 
+		for (auto bit : input_bits)
+			undriven_bits.erase(sigmap(bit));
+		for (auto bit : output_bits)
+			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;
-- 
2.30.2