--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/ReadEliminationPhase.java	Tue Jun 28 13:52:36 2011 +0200
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2011, 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 com.oracle.max.graal.compiler.phases;
+
+import com.oracle.max.graal.compiler.*;
+import com.oracle.max.graal.compiler.debug.*;
+import com.oracle.max.graal.compiler.ir.*;
+import com.oracle.max.graal.graph.*;
+
+/**
+ * Duplicates every node in the graph to test the implementation of the {@link com.oracle.max.graal.graph.Node#copy()} method in node subclasses.
+ */
+public class ReadEliminationPhase extends Phase {
+
+    @Override
+    protected void run(Graph graph) {
+        for (ReadNode n : graph.getNodes(ReadNode.class)) {
+            Node memoryInput = n.inputs().variablePart().get(0);
+            if (memoryInput instanceof WriteNode) {
+                WriteNode other = (WriteNode) memoryInput;
+                if (other.object() == n.object() && other.location().same(n.location())) {
+                    if (GraalOptions.TraceReadElimination) {
+                        TTY.println("Eliminated memory read " + n + "and replaced with node " + other.value());
+                    }
+                    n.replaceAndDelete(other.value());
+                }
+            }
+        }
+    }
+}