--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/ValueNodeUtil.java	2016-12-09 00:55:10.907370425 -0800
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2011, 2015, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.nodes;
+
+import static java.lang.Character.toLowerCase;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.nodeinfo.Verbosity;
+import org.graalvm.compiler.nodes.memory.MemoryNode;
+
+import jdk.vm.ci.meta.JavaKind;
+
+public class ValueNodeUtil {
+
+    public static ValueNode assertKind(JavaKind kind, ValueNode x) {
+        assert x != null && x.getStackKind() == kind : "kind=" + kind + ", value=" + x + ((x == null) ? "" : ", value.kind=" + x.getStackKind());
+        return x;
+    }
+
+    public static RuntimeException shouldNotReachHere(String msg) {
+        throw new InternalError("should not reach here: " + msg);
+    }
+
+    public static RuntimeException shouldNotReachHere() {
+        throw new InternalError("should not reach here");
+    }
+
+    public static ValueNode assertLong(ValueNode x) {
+        assert x != null && (x.getStackKind() == JavaKind.Long);
+        return x;
+    }
+
+    public static ValueNode assertInt(ValueNode x) {
+        assert x != null && (x.getStackKind() == JavaKind.Int);
+        return x;
+    }
+
+    public static ValueNode assertFloat(ValueNode x) {
+        assert x != null && (x.getStackKind() == JavaKind.Float);
+        return x;
+    }
+
+    public static ValueNode assertObject(ValueNode x) {
+        assert x != null && (x.getStackKind() == JavaKind.Object);
+        return x;
+    }
+
+    public static ValueNode assertDouble(ValueNode x) {
+        assert x != null && (x.getStackKind() == JavaKind.Double);
+        return x;
+    }
+
+    public static void assertHigh(ValueNode x) {
+        assert x == null;
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T extends Node> Collection<T> filter(Iterable<Node> nodes, Class<T> clazz) {
+        ArrayList<T> phis = new ArrayList<>();
+        for (Node node : nodes) {
+            if (clazz.isInstance(node)) {
+                phis.add((T) node);
+            }
+        }
+        return phis;
+    }
+
+    /**
+     * Converts a given instruction to a value string. The representation of an node as a value is
+     * formed by concatenating the {@linkplain jdk.vm.ci.meta.JavaKind#getTypeChar character}
+     * denoting its {@linkplain ValueNode#getStackKind kind} and its id. For example, {@code "i13"}.
+     *
+     * @param value the instruction to convert to a value string. If {@code value == null}, then "-"
+     *            is returned.
+     * @return the instruction representation as a string
+     */
+    public static String valueString(ValueNode value) {
+        return (value == null) ? "-" : ("" + toLowerCase(value.getStackKind().getTypeChar()) + value.toString(Verbosity.Id));
+    }
+
+    public static ValueNode asNode(MemoryNode node) {
+        if (node == null) {
+            return null;
+        } else {
+            return node.asNode();
+        }
+    }
+}