From a69c595802bb20517ced3a2a82a6dde4b8dc6a03 Mon Sep 17 00:00:00 2001
From: David Shah <dave@ds0.me>
Date: Thu, 12 Nov 2020 11:08:13 +0000
Subject: router1: Fix same-source-dest case

Signed-off-by: David Shah <dave@ds0.me>
---
 common/router1.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'common/router1.cc')

diff --git a/common/router1.cc b/common/router1.cc
index 946327d2..d2816c1e 100644
--- a/common/router1.cc
+++ b/common/router1.cc
@@ -469,6 +469,20 @@ struct Router1
             }
         }
 
+        // special case
+
+        if (src_wire == dst_wire) {
+            NetInfo *bound = ctx->getBoundWireNet(src_wire);
+            if (bound != nullptr)
+                NPNR_ASSERT(bound == net_info);
+            else {
+                ctx->bindWire(src_wire, net_info, STRENGTH_WEAK);
+            }
+            arc_to_wires[arc].insert(src_wire);
+            wire_to_arcs[src_wire].insert(arc);
+            return true;
+        }
+
         // reset wire queue
 
         if (!queue.empty()) {
-- 
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