add find_pin_nodes_at_side() to RRSpatialLookup

Author: soheilshahrouz

libs/librrgraph/src/base/rr_spatial_lookup.cpp

@@ -210,6 +210,18 @@ std::vector<RRNodeId> RRSpatialLookup::find_grid_nodes_at_all_sides(int layer,
     return nodes;
 }
 
+std::vector<RRNodeId> RRSpatialLookup::find_pin_nodes_at_side(int layer,
+                                                              int x,
+                                                              int y,
+                                                              e_rr_type pin_type,
+                                                              e_side side) const {
+    VTR_ASSERT(pin_type == e_rr_type::OPIN || pin_type == e_rr_type::IPIN);
+
+    std::vector<RRNodeId> nodes = find_nodes(layer,x, y, pin_type, side);
+    return nodes;
+
+}
+
 void RRSpatialLookup::reserve_nodes(int layer,
                                     int x,
                                     int y,

libs/librrgraph/src/base/rr_spatial_lookup.h

@@ -139,6 +139,13 @@ class RRSpatialLookup {
                                                        int y,
                                                        e_rr_type rr_type) const;
 
+
+    std::vector<RRNodeId> find_pin_nodes_at_side(int layer,
+                                                 int x,
+                                                 int y,
+                                                 e_rr_type pin_type,
+                                                 e_side side) const;
+
     /* -- Mutators -- */
   public:
     /** @brief Reserve the memory for a list of nodes at (layer, x, y) location with given type and side */