src/share/tools/IdealGraphVisualizer/Data/src/com/sun/hotspot/igv/data/InputBlock.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -88,11 +88,13 @@
     }
 
     public void addNode(int id) {
         InputNode node = graph.getNode(id);
         assert node != null;
-        assert !nodes.contains(node) : "duplicate : " + node;
+        // nodes.contains(node) is too expensive for large graphs so
+        // just make sure the Graph doesn't know it yet.
+        assert graph.getBlock(id) == null : "duplicate : " + node;
         graph.setBlock(node, this);
         nodes.add(node);
     }
 
     public Set<InputBlock> getSuccessors() {