--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/CanonicalizerPhase.java	Sat Dec 08 05:04:19 2018 +0100
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/CanonicalizerPhase.java	Sat Dec 08 00:56:10 2018 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, 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
@@ -348,6 +348,9 @@
                     debug.log(DebugContext.VERBOSE_LEVEL, "Canonicalizer: simplifying %s", node);
                     COUNTER_SIMPLIFICATION_CONSIDERED_NODES.increment(debug);
                     node.simplify(tool);
+                    if (node.isDeleted()) {
+                        debug.log("Canonicalizer: simplified %s", node);
+                    }
                     return node.isDeleted();
                 }
                 return false;