Fix predicate and add comments

Xilinx · Nov 24, 2022 · e2cc447 · e2cc447
1 parent ff9ce78
commit e2cc447
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/src/com/xilinx/rapidwright/rwroute/RWRoute.java b/src/com/xilinx/rapidwright/rwroute/RWRoute.java
@@ -412,14 +412,16 @@ protected void routeStaticNets() {
             List<SitePinInst> pins = e.getValue();
             System.out.println("INFO: Route " + pins.size() + " pins of " + net);
             Map<SitePinInst, List<Node>> sinksRoutingPaths = GlobalSignalRouting.routeStaticNet(net,
+                    // Predicate to determine whether a node is unavailable for global routing
                     (node) -> {
                         Net preservedNet = routingGraph.getPreservedNet(node);
-                        if (net == null) {
-                            return true;
-                        }
-                        if (net == preservedNet) {
-                            return false;
+                        if (preservedNet != null) {
+                            // If one is present, it is unavailable only if it isn't carrying
+                            // the net undergoing routing
+                            return preservedNet != net;
                         }
+                        // A RouteNode will only be created if the net is necessary for
+                        // a to-be-routed connection
                         return routingGraph.getNode(node) != null;
                     },
                     design, routethruHelper);