From 98c18d7f14434f0a72f982631da5124e3b3a2e83 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Tue, 21 Apr 2026 13:59:47 +0200
Subject: [PATCH] router2: Fix ripup of constant nets

Signed-off-by: gatecat <gatecat@ds0.me>
---
 common/route/router2.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/route/router2.cc b/common/route/router2.cc
index 5650549f..e3e3bb8b 100644
--- a/common/route/router2.cc
+++ b/common/route/router2.cc
@@ -527,7 +527,8 @@ struct Router2
             }
             cursor = ctx->getPipSrcWire(uh);
         }
-        return (cursor == src_wire);
+        return (cursor == src_wire) ||
+               (net->constant_value != IdString() && ctx->getWireConstantValue(cursor) == net->constant_value);
     }
 
     void record_prerouted_net(NetInfo *net, store_index<PortRef> usr, size_t phys_pin)