From: Clifford Wolf <clifford@clifford.at>
Date: Mon, 31 Dec 2018 15:34:27 +0000 (+0100)
Subject: Fix handling of (* keep *) wires in wreduce
X-Git-Tag: yosys-0.9~354
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0a840dd88334c382314db3aafc2f1da2a1969df2;p=yosys.git

Fix handling of (* keep *) wires in wreduce

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---

diff --git a/passes/opt/wreduce.cc b/passes/opt/wreduce.cc
index 0164f58d6..8063b86a6 100644
--- a/passes/opt/wreduce.cc
+++ b/passes/opt/wreduce.cc
@@ -235,8 +235,11 @@ struct WreduceWorker
 		} else {
 			while (GetSize(sig) > 0)
 			{
-				auto info = mi.query(sig[GetSize(sig)-1]);
+				auto bit = sig[GetSize(sig)-1];
+				if (keep_bits.count(bit))
+					break;
 
+				auto info = mi.query(bit);
 				if (info->is_output || GetSize(info->ports) > 1)
 					break;