Added check in check_rr_node

Author: Nathan Shreve

libs/librrgraph/src/base/check_rr_graph.cpp

@@ -399,12 +399,23 @@ void check_rr_node(const RRGraphView& rr_graph,
                                 "in check_rr_node: node %d (type %d) has endpoints (%d,%d) and (%d,%d)\n", inode, rr_type, xlow, ylow, xhigh, yhigh);
             }
             break;
-        case SINK:
+        case SINK: {
             if (type == nullptr) {
                 VPR_FATAL_ERROR(VPR_ERROR_ROUTE,
                                 "in check_rr_node: node %d (type %d) is at an illegal clb location (%d, %d).\n", inode, rr_type, xlow, ylow);
             }
+
+            int tile_xlow = xlow - grid.get_width_offset({xlow, ylow, layer_num});
+            int tile_ylow = ylow - grid.get_height_offset({xlow, ylow, layer_num});
+            int tile_xhigh = tile_xlow + type->width - 1;
+            int tile_yhigh = tile_ylow + type->height - 1;
+
+            if (xlow < tile_xlow || ylow < tile_ylow || xhigh > tile_xhigh || yhigh > tile_yhigh) {
+                VPR_FATAL_ERROR(VPR_ERROR_ROUTE,
+                                "in check_rr_node: node %d (type %d) has endpoints (%d,%d) and (%d,%d)\n", inode, rr_type, xlow, ylow, xhigh, yhigh);
+            }
             break;
+        }
         case IPIN:
         case OPIN:
             if (type == nullptr) {