From 059f8ca1120cdb27b5fb79ca20eeeddf7feaefc2 Mon Sep 17 00:00:00 2001
From: tangxifan <tangxifan@gmail.com>
Date: Fri, 20 Jan 2023 21:50:59 -0800
Subject: [PATCH] [engine] fixed a bug in repack when only invisible routing
 sinks are found

---
 openfpga/src/repack/repack.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/openfpga/src/repack/repack.cpp b/openfpga/src/repack/repack.cpp
index 4cc594e2d..d47c08be5 100644
--- a/openfpga/src/repack/repack.cpp
+++ b/openfpga/src/repack/repack.cpp
@@ -762,8 +762,12 @@ static void add_lb_router_nets(
      * */
     int pb_route_index;
     if (0 == pb_route_indices.size()) {
-      VTR_LOGV(verbose, "Bypass routing due to no routing traces found\n");
-      continue;
+      if (ignored_global_net_sinks[atom_net_id_to_route].empty()) {
+        VTR_LOGV(verbose, "Bypass routing due to no routing traces found\n");
+        continue;
+      } else {
+        VTR_LOGV(verbose, "No regular routing traces found but only invisible routing traces will be considered\n");
+      }
     } else if (1 == pb_route_indices.size()) {
       pb_route_index = pb_route_indices[0];
     } else {