Check if CHANZ nodes' RC values are valid

Author: soheilshahrouz

libs/librrgraph/src/base/check_rr_graph.cpp

@@ -556,7 +556,7 @@ void check_rr_node(const RRGraphView& rr_graph,
     float C = rr_graph.node_C(rr_node);
     float R = rr_graph.node_R(rr_node);
 
-    if (rr_type == e_rr_type::CHANX || rr_type == e_rr_type::CHANY) {
+    if (rr_type == e_rr_type::CHANX || rr_type == e_rr_type::CHANY || rr_type == e_rr_type::CHANZ) {
         if (C < 0. || R < 0.) {
             VPR_ERROR(VPR_ERROR_ROUTE,
                       "in check_rr_node: node %d of type %d has R = %g and C = %g.\n", inode, rr_type, R, C);

vpr/src/draw/draw_rr_edges.cpp

@@ -60,9 +60,9 @@ void draw_chany_to_chany_edge(RRNodeId from_node, RRNodeId to_node, RRSwitchId r
                     y2 = to_chan.bottom();
                     y1 = draw_coords->tile_y[to_ylow] + 0.1 * draw_coords->get_tile_height();
                 } else {
+                    // since no U-turns from_tracks must be INC as well
                     VTR_ASSERT_SAFE(rr_graph.node_direction(from_node) == Direction::INC);
                     y2 = to_chan.bottom();
-                    // since no U-turns from_tracks must be INC as well
                     y1 = draw_coords->tile_y[to_ylow - 1] + draw_coords->get_tile_height();
                 }
             } else { // DEC wire starts at top edge