[vpr] fixed a bug on access invalid grid nodes

Author: tangxifan

vpr/src/tileable_rr_graph/rr_graph_view_util.cpp

@@ -101,7 +101,9 @@ std::vector<RRNodeId> find_rr_graph_grid_nodes(const RRGraphView& rr_graph,
     VTR_ASSERT(rr_type == IPIN || rr_type == OPIN);
 
     /* Ensure that (x, y) is a valid location in grids */
-    VTR_ASSERT(size_t(x) <= device_grid.width() && size_t(y) <= device_grid.height());
+    if (size_t(x) > device_grid.width() - 1 || size_t(y) > device_grid.height() - 1) {
+      return indices;
+    }
 
     /* Ensure we have a valid side */
     VTR_ASSERT(side != NUM_SIDES);
@@ -110,6 +112,7 @@ std::vector<RRNodeId> find_rr_graph_grid_nodes(const RRGraphView& rr_graph,
     t_physical_tile_loc tile_loc(x, y, layer);
     int width_offset = device_grid.get_width_offset(tile_loc);
     int height_offset = device_grid.get_height_offset(tile_loc);
+    
     for (int pin = 0; pin < device_grid.get_physical_type(tile_loc)->num_pins; ++pin) {
         /* Skip those pins have been ignored during rr_graph build-up */
         if (true == device_grid.get_physical_type(tile_loc)->is_ignored_pin[pin]) {