--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/6636138/Test2.java	Tue Mar 24 12:19:47 2009 -0700
@@ -0,0 +1,70 @@
+/*
+ * 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=Test2.shift -XX:+UseSuperword Test2
+ */
+
+class Test2 {
+
+    public static void init(int src[]) {
+        // Initialize the array
+        for (int i = 0; i < src.length; i++)
+            src[i] = i;
+    }
+
+   public static void shift(int src[]) {
+       //left-shift the array
+       for (int i = src.length-1; i > 0; i--){
+           int tmp  = src[i];
+           src[i]   = src[i-1];
+           src[i-1] = tmp;
+       }
+    }
+
+    public static void verify(int src[]) {
+        for (int i = 0; i < src.length; i++){
+            int value = (i-1 + src.length)%src.length; // correct value after shifting
+                if (src[i] != value) {
+                    System.out.println("Error: src["+i+"] should be "+ value + " instead of " + src[i]);
+                    System.exit(-1);
+                }
+        }
+    }
+
+    public static void test() {
+        int[] src = new int[10];
+        init(src);
+        shift(src);
+        verify(src);
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i< 2000; i++)
+            test();
+    }
+}