From: Eddie Hung <eddie@fpgeh.com>
Date: Thu, 6 Jun 2019 19:44:50 +0000 (-0700)
Subject: Non chain user check using next_sig
X-Git-Tag: yosys-0.9~48^2~27
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d2172c6846f710e9a362708e3308dd302110deb2;p=yosys.git

Non chain user check using next_sig
---

diff --git a/passes/opt/muxpack.cc b/passes/opt/muxpack.cc
index 9668b0d43..963083107 100644
--- a/passes/opt/muxpack.cc
+++ b/passes/opt/muxpack.cc
@@ -84,19 +84,17 @@ struct MuxpackWorker
 	{
 		for (auto it : sig_chain_next)
 		{
-			SigSpec next_sig;
-
-            for (auto bit : it.first.bits())
-                if (sigbit_with_non_chain_users.count(bit))
-                    goto start_cell;
-
-			next_sig = it.second->getPort("\\A");
+			SigSpec next_sig = it.second->getPort("\\A");
 			if (sig_chain_prev.count(next_sig) == 0) {
 				next_sig = it.second->getPort("\\B");
 				if (sig_chain_prev.count(next_sig) == 0)
 					next_sig = SigSpec();
 			}
 
+			for (auto bit : next_sig.bits())
+				if (sigbit_with_non_chain_users.count(bit))
+					goto start_cell;
+
 			if (!next_sig.empty())
 			{
 				Cell *c1 = sig_chain_prev.at(next_sig);