grt: prevent assigning routing edges out of the net layer range

Signed-off-by: Eder Monteiro <[email protected]>

Author: eder-matheus

src/grt/src/cugr/src/GRNet.cpp

@@ -18,6 +18,7 @@ GRNet::GRNet(const CUGRNet& baseNet, const GridGraph* gridGraph)
   db_net_ = baseNet.getDbNet();
   const int numPins = baseNet.getNumPins();
   pin_access_points_.resize(numPins);
+  layer_range_ = baseNet.getLayerRange();
   for (CUGRPin& pin : baseNet.getPins()) {
     const std::vector<BoxOnLayer> pinShapes = pin.getPinShapes();
     std::unordered_set<uint64_t> included;
@@ -43,4 +44,10 @@ GRNet::GRNet(const CUGRNet& baseNet, const GridGraph* gridGraph)
   }
 }
 
+bool GRNet::isInsideLayerRange(int layer_index) const
+{
+  return layer_index >= layer_range_.min_layer
+         && layer_index <= layer_range_.max_layer;
+}
+
 }  // namespace grt

src/grt/src/cugr/src/GRNet.h

@@ -39,13 +39,15 @@ class GRNet
     routing_tree_ = std::move(tree);
   }
   void clearRoutingTree() { routing_tree_ = nullptr; }
+  bool isInsideLayerRange(int layer_index) const;
 
  private:
   int index_;
   odb::dbNet* db_net_;
   std::vector<std::vector<GRPoint>> pin_access_points_;
   BoxT bounding_box_;
   std::shared_ptr<GRTreeNode> routing_tree_;
+  LayerRange layer_range_;
 };
 
 }  // namespace grt

src/grt/src/cugr/src/PatternRoute.cpp

@@ -546,8 +546,11 @@ void PatternRoute::calculateRoutingCosts(
         if (grid_graph_->getLayerDirection(layerIndex) != direction) {
           continue;
         }
-        CostT cost = path->getCosts()[layerIndex]
-                     + grid_graph_->getWireCost(layerIndex, *node, *path);
+        CostT cost
+            = net_->isInsideLayerRange(layerIndex)
+                  ? path->getCosts()[layerIndex]
+                        + grid_graph_->getWireCost(layerIndex, *node, *path)
+                  : std::numeric_limits<CostT>::max();
         if (cost < costs[layerIndex].first) {
           costs[layerIndex] = std::make_pair(cost, pathIndex);
         }