1 /*
   2  * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 6636138
  27  * @summary SuperWord::co_locate_pack(Node_List* p) generates memory graph that leads to memory order violation.
  28  *
  29  * @run main/othervm -server -Xbatch -XX:CompileOnly=Test2.shift Test2
  30  */
  31 
  32 class Test2 {
  33 
  34     public static void init(int src[]) {
  35         // Initialize the array
  36         for (int i = 0; i < src.length; i++)
  37             src[i] = i;
  38     }
  39 
  40    public static void shift(int src[]) {
  41        //left-shift the array
  42        for (int i = src.length-1; i > 0; i--){
  43            int tmp  = src[i];
  44            src[i]   = src[i-1];
  45            src[i-1] = tmp;
  46        }
  47     }
  48 
  49     public static void verify(int src[]) {
  50         for (int i = 0; i < src.length; i++){
  51             int value = (i-1 + src.length)%src.length; // correct value after shifting
  52                 if (src[i] != value) {
  53                     System.out.println("Error: src["+i+"] should be "+ value + " instead of " + src[i]);
  54                     System.exit(-1);
  55                 }
  56         }
  57     }
  58 
  59     public static void test() {
  60         int[] src = new int[10];
  61         init(src);
  62         shift(src);
  63         verify(src);
  64     }
  65 
  66     public static void main(String[] args) {
  67         for (int i=0; i< 2000; i++)
  68             test();
  69     }
  70 }