[libs][rr graph][io] update rr_grpah utils with tileable info

libs/librrgraph/src/utils/alloc_and_load_rr_indexed_data.cpp

@@ -348,6 +348,7 @@ static void load_rr_indexed_data_base_costs(const RRGraphView& rr_graph,
 
     rr_indexed_data[RRIndexedDataId(SOURCE_COST_INDEX)].base_cost = delay_normalization_fac;
     rr_indexed_data[RRIndexedDataId(SINK_COST_INDEX)].base_cost = 0.;
+    rr_indexed_data[RRIndexedDataId(MEDIUM_COST_INDEX)].base_cost = delay_normalization_fac;
     rr_indexed_data[RRIndexedDataId(OPIN_COST_INDEX)].base_cost = delay_normalization_fac;
     // The IPIN_COST_INDEX base cost is changed from 0.95 to 0.875 so it is perfectly representable in binary format (this change is made for SPEC benchmark).
     // This number is perfectly representable in a binary mantissa (without round-off) so we can get the same routing result on different platforms.
@@ -743,6 +744,8 @@ static void print_rr_index_info(const vtr::vector<RRIndexedDataId, t_rr_indexed_
             string_stream << cost_index << " SOURCE";
         } else if (cost_index == SINK_COST_INDEX) {
             string_stream << cost_index << " SINK";
+        } else if (cost_index == MEDIUM_COST_INDEX) {
+            string_stream << cost_index << " MEDIUM";
         } else if (cost_index == OPIN_COST_INDEX) {
             string_stream << cost_index << " OPIN";
         } else if (cost_index == IPIN_COST_INDEX) {

libs/librrgraph/src/utils/describe_rr_node.cpp

@@ -36,6 +36,11 @@ std::string describe_rr_node(const RRGraphView& rr_graph,
         msg += vtr::string_fmt(" pin: %d pin_name: %s",
                                rr_graph.node_pin_num(inode),
                                pin_name.c_str());
+    } else if (rr_graph.node_type(inode) == e_rr_type::MEDIUM) {
+        auto index = rr_graph.node_ptc_num(inode);
+
+        msg += vtr::string_fmt(" medium index: %d",
+                               index);
     } else {
         VTR_ASSERT(rr_graph.node_type(inode) == e_rr_type::SOURCE || rr_graph.node_type(inode) == e_rr_type::SINK);
 
@@ -49,4 +54,4 @@ std::string describe_rr_node(const RRGraphView& rr_graph,
     msg += " " + rr_graph.node_coordinate_to_string(inode);
 
     return msg;
-}
+}