diff --git a/src/grt/src/fastroute/include/FastRoute.h b/src/grt/src/fastroute/include/FastRoute.h
index 0b5b89cb7aa..8219923884d 100644
--- a/src/grt/src/fastroute/include/FastRoute.h
+++ b/src/grt/src/fastroute/include/FastRoute.h
@@ -467,6 +467,7 @@ class FastRouteCore
                          int l,
                          bool horizontal,
                          int& best_cost);
+  bool skipNet(int netID);
   void assignEdge(int netID, int edgeID, bool processDIR);
   void recoverEdge(int netID, int edgeID);
   void layerAssignmentV4();
diff --git a/src/grt/src/fastroute/src/FastRoute.cpp b/src/grt/src/fastroute/src/FastRoute.cpp
index baf6eac8af4..773ec5e5377 100644
--- a/src/grt/src/fastroute/src/FastRoute.cpp
+++ b/src/grt/src/fastroute/src/FastRoute.cpp
@@ -672,7 +672,7 @@ NetRouteMap FastRouteCore::getRoutes()
 {
   NetRouteMap routes;
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -748,7 +748,7 @@ NetRouteMap FastRouteCore::getPlanarRoutes()
   // Get routes before layer assignment
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1022,8 +1022,7 @@ NetRouteMap FastRouteCore::run()
   // debug mode Rectilinear Steiner Tree before overflow iterations
   if (debug_->isOn() && debug_->rectilinearSTree_) {
     for (int netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID]->getDbNet() == debug_->net_ && !nets_[netID]->isRouted()
-          && nets_[netID] != nullptr) {
+      if (nets_[netID]->getDbNet() == debug_->net_ && !skipNet(netID)) {
         StTreeVisualization(sttrees_[netID], nets_[netID], false);
       }
     }
@@ -1274,8 +1273,7 @@ NetRouteMap FastRouteCore::run()
   // Debug mode Tree 2D after overflow iterations
   if (debug_->isOn() && debug_->tree2D_) {
     for (int netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID]->getDbNet() == debug_->net_ && !nets_[netID]->isRouted()
-          && nets_[netID] != nullptr) {
+      if (nets_[netID]->getDbNet() == debug_->net_ && !skipNet(netID)) {
         StTreeVisualization(sttrees_[netID], nets_[netID], false);
       }
     }
@@ -1332,8 +1330,7 @@ NetRouteMap FastRouteCore::run()
   // Debug mode Tree 3D after layer assignament
   if (debug_->isOn() && debug_->tree3D_) {
     for (int netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID]->getDbNet() == debug_->net_ && !nets_[netID]->isRouted()
-          && nets_[netID] != nullptr) {
+      if (nets_[netID]->getDbNet() == debug_->net_ && !skipNet(netID)) {
         StTreeVisualization(sttrees_[netID], nets_[netID], true);
       }
     }
diff --git a/src/grt/src/fastroute/src/RSMT.cpp b/src/grt/src/fastroute/src/RSMT.cpp
index 32e578280cb..abdbc86d112 100644
--- a/src/grt/src/fastroute/src/RSMT.cpp
+++ b/src/grt/src/fastroute/src/RSMT.cpp
@@ -656,12 +656,12 @@ void FastRouteCore::gen_brk_RSMT(const bool congestionDriven,
   const int flute_accuracy = 2;
 
   for (int i = 0; i < netCount(); i++) {
-    FrNet* net = nets_[i];
-
-    if (net == nullptr || net->isRouted()) {
+    if (skipNet(i)) {
       continue;
     }
 
+    FrNet* net = nets_[i];
+
     float coeffV = 1.36;
 
     bool cong;
diff --git a/src/grt/src/fastroute/src/maze.cpp b/src/grt/src/fastroute/src/maze.cpp
index 85ed8203a13..491396ddb7a 100644
--- a/src/grt/src/fastroute/src/maze.cpp
+++ b/src/grt/src/fastroute/src/maze.cpp
@@ -61,7 +61,7 @@ void FastRouteCore::fixEmbeddedTrees()
   // i.e., when running overflow iterations
   if (overflow_iterations_ > 0) {
     for (int netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID] != nullptr && !nets_[netID]->isRouted()) {
+      if (!skipNet(netID)) {
         checkAndFixEmbeddedTree(netID);
       }
     }
@@ -500,7 +500,7 @@ void FastRouteCore::convertToMazerouteNet(const int netID)
 void FastRouteCore::convertToMazeroute()
 {
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] != nullptr && !nets_[netID]->isRouted()) {
+    if (!skipNet(netID)) {
       convertToMazerouteNet(netID);
     }
   }
@@ -1383,7 +1383,7 @@ void FastRouteCore::mazeRouteMSMD(const int iter,
   for (int nidRPC = 0; nidRPC < netCount(); nidRPC++) {
     const int netID = ordering ? tree_order_cong_[nidRPC].treeIndex : nidRPC;
 
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
diff --git a/src/grt/src/fastroute/src/maze3D.cpp b/src/grt/src/fastroute/src/maze3D.cpp
index d8cc384a72c..7be45f0bc90 100644
--- a/src/grt/src/fastroute/src/maze3D.cpp
+++ b/src/grt/src/fastroute/src/maze3D.cpp
@@ -888,12 +888,13 @@ void FastRouteCore::mazeRouteMSMDOrder3D(int expand,
 
   for (int orderIndex = 0; orderIndex < endIND; orderIndex++) {
     const int netID = tree_order_pv_[orderIndex].treeIndex;
-    FrNet* net = nets_[netID];
 
-    if (net == nullptr || net->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
+    FrNet* net = nets_[netID];
+
     int enlarge = expand;
     const int num_terminals = sttrees_[netID].num_terminals;
     auto& treeedges = sttrees_[netID].edges;
diff --git a/src/grt/src/fastroute/src/route.cpp b/src/grt/src/fastroute/src/route.cpp
index bfb5f8113ea..1308257c45c 100644
--- a/src/grt/src/fastroute/src/route.cpp
+++ b/src/grt/src/fastroute/src/route.cpp
@@ -230,7 +230,7 @@ void FastRouteCore::routeLAll(bool firstTime)
   if (firstTime) {  // no previous route
     // estimate congestion with 0.5+0.5 L
     for (int i = 0; i < netCount(); i++) {
-      if (nets_[i] == nullptr || nets_[i]->isRouted()) {
+      if (skipNet(i)) {
         continue;
       }
 
@@ -240,7 +240,7 @@ void FastRouteCore::routeLAll(bool firstTime)
     }
     // L route
     for (int i = 0; i < netCount(); i++) {
-      if (nets_[i] == nullptr || nets_[i]->isRouted()) {
+      if (skipNet(i)) {
         continue;
       }
 
@@ -252,7 +252,7 @@ void FastRouteCore::routeLAll(bool firstTime)
     }
   } else {  // previous is L-route
     for (int i = 0; i < netCount(); i++) {
-      if (nets_[i] == nullptr || nets_[i]->isRouted()) {
+      if (skipNet(i)) {
         continue;
       }
 
@@ -419,13 +419,13 @@ void FastRouteCore::newrouteLAll(bool firstTime, bool viaGuided)
 {
   if (firstTime) {
     for (int i = 0; i < netCount(); i++) {
-      if (nets_[i] != nullptr && !nets_[i]->isRouted()) {
+      if (!skipNet(i)) {
         newrouteL(i, RouteType::NoRoute, viaGuided);  // do L-routing
       }
     }
   } else {
     for (int i = 0; i < netCount(); i++) {
-      if (nets_[i] != nullptr && !nets_[i]->isRouted()) {
+      if (!skipNet(i)) {
         newrouteL(i, RouteType::LRoute, viaGuided);
       }
     }
@@ -859,7 +859,7 @@ void FastRouteCore::newrouteZ(int netID, int threshold)
 void FastRouteCore::newrouteZAll(int threshold)
 {
   for (int i = 0; i < netCount(); i++) {
-    if (nets_[i] != nullptr && !nets_[i]->isRouted()) {
+    if (!skipNet(i)) {
       newrouteZ(i, threshold);  // ripup previous route and do Z-routing
     }
   }
@@ -1059,7 +1059,7 @@ void FastRouteCore::routeMonotonic(int netID, int edgeID, int threshold)
 void FastRouteCore::routeMonotonicAll(int threshold)
 {
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1245,7 +1245,7 @@ void FastRouteCore::spiralRoute(int netID, int edgeID)
 void FastRouteCore::spiralRouteAll()
 {
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1296,7 +1296,7 @@ void FastRouteCore::spiralRouteAll()
   }
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1326,7 +1326,7 @@ void FastRouteCore::spiralRouteAll()
 
   std::queue<int> edgeQueue;
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1382,7 +1382,7 @@ void FastRouteCore::spiralRouteAll()
   }
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1725,7 +1725,7 @@ void FastRouteCore::routeLVAll(int threshold, int expand, float logis_cof)
   multi_array<float, 2> d2(boost::extents[y_range_][x_range_]);
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
diff --git a/src/grt/src/fastroute/src/utility.cpp b/src/grt/src/fastroute/src/utility.cpp
index 994a6508897..b595e1375d5 100644
--- a/src/grt/src/fastroute/src/utility.cpp
+++ b/src/grt/src/fastroute/src/utility.cpp
@@ -67,7 +67,7 @@ void FastRouteCore::ConvertToFull3DType2()
   short tmpX[MAXLEN], tmpY[MAXLEN], tmpL[MAXLEN];
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -147,7 +147,7 @@ void FastRouteCore::netpinOrderInc()
   tree_order_pv_.clear();
 
   for (int j = 0; j < netCount(); j++) {
-    if (nets_[j] == nullptr || nets_[j]->isRouted()) {
+    if (skipNet(j)) {
       continue;
     }
 
@@ -180,7 +180,7 @@ void FastRouteCore::fillVIA()
   int numVIAT2 = 0;
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -324,7 +324,7 @@ int FastRouteCore::threeDVIA()
   int numVIA = 0;
 
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
     auto& treeedges = sttrees_[netID].edges;
@@ -753,7 +753,7 @@ void FastRouteCore::layerAssignmentV4()
   TreeEdge* treeedge;
 
   for (netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -772,7 +772,7 @@ void FastRouteCore::layerAssignmentV4()
   for (i = 0; i < tree_order_pv_.size(); i++) {
     netID = tree_order_pv_[i].treeIndex;
 
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -895,7 +895,7 @@ void FastRouteCore::layerAssignment()
   TreeEdge* treeedge;
 
   for (netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -946,7 +946,7 @@ void FastRouteCore::layerAssignment()
   }
 
   for (netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1030,7 +1030,7 @@ void FastRouteCore::checkRoute3D()
   bool gridFlag;
 
   for (netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1152,7 +1152,7 @@ void FastRouteCore::StNetOrder()
   i = 0;
   for (j = 0; j < netCount(); j++) {
     // if the net is routed
-    if (nets_[j] == nullptr || nets_[j]->isRouted()) {
+    if (skipNet(j)) {
       continue;
     }
 
@@ -1224,7 +1224,7 @@ float FastRouteCore::CalculatePartialSlack()
     }
   }
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
     auto fr_net = nets_[netID];
@@ -1245,7 +1245,7 @@ float FastRouteCore::CalculatePartialSlack()
   // Set the non critical nets slack as the lowest float, so they can be
   // ordered by overflow (and ordered first than the critical nets)
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
     if (nets_[netID]->getSlack() > slack_th) {
@@ -1335,7 +1335,7 @@ void FastRouteCore::recoverEdge(int netID, int edgeID)
 void FastRouteCore::removeLoops()
 {
   for (int netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1666,6 +1666,11 @@ void FastRouteCore::printTree2D(int netID)
   }
 }
 
+bool FastRouteCore::skipNet(int netID)
+{
+  return nets_[netID] == nullptr || nets_[netID]->isRouted();
+}
+
 bool FastRouteCore::checkRoute2DTree(int netID)
 {
   bool STHwrong = false;
@@ -1765,7 +1770,7 @@ void FastRouteCore::copyRS(void)
 
   if (!sttrees_bk_.empty()) {
     for (netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+      if (skipNet(netID)) {
         continue;
       }
 
@@ -1783,7 +1788,7 @@ void FastRouteCore::copyRS(void)
   sttrees_bk_.resize(netCount());
 
   for (netID = 0; netID < netCount(); netID++) {
-    if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+    if (skipNet(netID)) {
       continue;
     }
 
@@ -1838,7 +1843,7 @@ void FastRouteCore::copyBR(void)
 
   if (!sttrees_bk_.empty()) {
     for (netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+      if (skipNet(netID)) {
         continue;
       }
 
@@ -1852,7 +1857,7 @@ void FastRouteCore::copyBR(void)
     }
 
     for (netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+      if (skipNet(netID)) {
         continue;
       }
 
@@ -1952,7 +1957,7 @@ void FastRouteCore::freeRR(void)
   int netID, edgeID, numEdges;
   if (!sttrees_bk_.empty()) {
     for (netID = 0; netID < netCount(); netID++) {
-      if (nets_[netID] == nullptr || nets_[netID]->isRouted()) {
+      if (skipNet(netID)) {
         continue;
       }