router2: Deal with some special cases

Signed-off-by: David Shah <dave@ds0.me>

1 files changed, 10 insertions, 0 deletions

diff --git a/common/router2.cc b/common/router2.cc
index b6875ef0..152878c6 100644
--- a/common/router2.cc
+++ b/common/router2.cc
@@ -572,7 +572,17 @@ struct Router2
         auto &ad = nd.arcs.at(usr_idx);
         auto &usr = net->users.at(usr_idx);
         WireId src = ctx->getNetinfoSourceWire(net);
+        // Skip routes with no source
+        if (src == WireId())
+            return true;
         WireId dst = ctx->getNetinfoSinkWire(net, usr);
+        // Skip routes where the destination is already bound
+        if (dst == WireId() || ctx->getBoundWireNet(dst) == net)
+            return true;
+        // Skip routes where there is no routing (special cases)
+        if (ad.wires.empty())
+            return true;
+
         WireId cursor = dst;
 
         std::vector<PipId> to_bind;