[vpr][route] get ipin c from rr graph in add_rr_graph_C_from_switches

Author: amin1377

vpr/src/route/rr_graph_generation/rr_graph_timing_params.cpp

@@ -8,7 +8,7 @@
 
 /****************** Subroutine definitions *********************************/
 
-void add_rr_graph_C_from_switches(float C_ipin_cblock) {
+void add_rr_graph_C_from_switches() {
     /* This routine finishes loading the C elements of the rr_graph. It assumes *
      * that when you call it the CHANX and CHANY nodes have had their C set to  *
      * their metal capacitance, and everything else has C set to 0.  The graph  *
@@ -100,18 +100,19 @@ void add_rr_graph_C_from_switches(float C_ipin_cblock) {
                 }
                 /* End edge to CHANX or CHANY node. */
                 else if (to_rr_type == e_rr_type::IPIN) {
+                    float ipin_c = rr_graph.rr_switch_inf(RRSwitchId(switch_index)).Cin;
                     if (INCLUDE_TRACK_BUFFERS) {
                         /* Implements sharing of the track to connection box buffer.
                          * Such a buffer exists at every segment of the wire at which
                          * at least one logic block input connects. */
                         icblock = seg_index_of_cblock(rr_graph, from_rr_type, to_node);
                         if (cblock_counted[icblock] == false) {
-                            rr_node_C[inode] += C_ipin_cblock;
+                            rr_node_C[inode] += ipin_c;
                             cblock_counted[icblock] = true;
                         }
                     } else {
                         /* No track buffer. Simply add the capacitance onto the wire */
-                        rr_node_C[inode] += C_ipin_cblock;
+                        rr_node_C[inode] += ipin_c;
                     }
                 }
             } /* End loop over all edges of a node. */

vpr/src/route/rr_graph_generation/rr_graph_timing_params.h

@@ -1,3 +1,3 @@
 #pragma once
 
-void add_rr_graph_C_from_switches(float C_ipin_cblock);
+void add_rr_graph_C_from_switches();