diff -r ebebd376f657 -r 78af5ae8e731 test/compiler/6636138/Test1.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/6636138/Test1.java	Tue Mar 24 12:19:47 2009 -0700
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 6636138
+ * @summary SuperWord::co_locate_pack(Node_List* p) generates memory graph that leads to memory order violation.
+ *
+ * @run main/othervm -server -Xbatch -XX:CompileOnly=Test1.init -XX:+UseSuperword Test1
+ */
+
+class Test1 {
+
+    public static void init(int src[], int [] dst, int[] ref) {
+        // initialize the arrays
+        for (int i =0; i<src.length; i++) {
+            src[i] =  i;
+            dst[i] = 2;      // yes, dst[i] needed(otherwise src[i] will be replaced with i)
+            ref[i] = src[i]; // src[i] depends on the store src[i]
+        }
+    }
+
+    public static void verify(int src[], int[] ref) {
+        // check whether src and ref are equal
+        for (int i = 0; i < src.length; i++) {
+            if (src[i] != ref[i]) {
+                System.out.println("Error: src and ref don't match at " + i);
+                System.exit(-1);
+            }
+        }
+    }
+
+    public static void test() {
+        int[] src = new int[34];
+        int[] dst = new int[34];
+        int[] ref = new int[34];
+
+        init(src, dst, ref);
+        verify(src, ref);
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i< 2000; i++) {
+            test();
+        }
+    }
+}