From 9b9c3327ccf3a8e69f9af57333839f470df0ce66 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 6 Mar 2014 14:18:34 +0100
Subject: [PATCH] Fixed undef handling in opt_reduce

---
 passes/opt/opt_reduce.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/passes/opt/opt_reduce.cc b/passes/opt/opt_reduce.cc
index dd1299810..fee8fb71b 100644
--- a/passes/opt/opt_reduce.cc
+++ b/passes/opt/opt_reduce.cc
@@ -65,8 +65,8 @@ struct OptReduceWorker
 				continue;
 			}
 			if (chunk.wire == NULL) {
-				new_sig_a = RTLIL::SigSpec(RTLIL::State::Sx);
-				break;
+				new_sig_a.append(chunk);
+				continue;
 			}
 
 			bool imported_children = false;