From 0709e5bb81eb38e3c137a113da75b64b502c4ecb Mon Sep 17 00:00:00 2001
From: tangxifan <tangxifan@gmail.com>
Date: Sat, 24 Apr 2021 13:27:44 -0600
Subject: [PATCH] [Tool] Fixed a bug in the routing trace finder for direct
 connections inside repacker

---
 openfpga/src/repack/repack.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/openfpga/src/repack/repack.cpp b/openfpga/src/repack/repack.cpp
index 5e25179a5..d6cb669bc 100644
--- a/openfpga/src/repack/repack.cpp
+++ b/openfpga/src/repack/repack.cpp
@@ -28,6 +28,8 @@ namespace openfpga {
  * - sink is an input of a primitive pb_type
  * 
  * Note: 
+ *  - This function is applicable ONLY to single-mode pb_types!!! Because their routing traces
+ *    are deterministic: there is only 1 valid path from a source pin to a sink pin!!!
  *  - If there is a fan-out of the current source pb graph pin is not a direct interconnection
  *    the direct search should stop. 
  *  - This function is designed for pb graph without local routing
@@ -58,6 +60,11 @@ bool rec_direct_search_sink_pb_graph_pins(const t_pb_graph_pin* source_pb_pin,
 
   std::vector<t_pb_graph_pin*> sink_pb_pins_to_search;
 
+  /* Only support single-mode pb_type!!! */
+  if (1 != source_pb_pin->parent_node->pb_type->num_modes) {
+    return false;
+  }
+
   for (int iedge = 0; iedge < source_pb_pin->num_output_edges; ++iedge) {
     if (DIRECT_INTERC != source_pb_pin->output_edges[iedge]->interconnect->type) {
       return false;