1/*
2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 -Xbatch
30 *      -XX:CompileCommand=compileonly,compiler.c2.Test6636138_2::shift
31 *      compiler.c2.Test6636138_2
32 */
33
34package compiler.c2;
35
36public class Test6636138_2 {
37
38    public static void init(int src[]) {
39        // Initialize the array
40        for (int i = 0; i < src.length; i++)
41            src[i] = i;
42    }
43
44    public static void shift(int src[]) {
45        //left-shift the array
46        for (int i = src.length - 1; i > 0; i--) {
47            int tmp = src[i];
48            src[i] = src[i - 1];
49            src[i - 1] = tmp;
50        }
51    }
52
53    public static void verify(int src[]) {
54        for (int i = 0; i < src.length; i++) {
55            int value = (i - 1 + src.length) % src.length; // correct value after shifting
56            if (src[i] != value) {
57                System.out.println("Error: src[" + i + "] should be " + value + " instead of " + src[i]);
58                System.exit(97);
59            }
60        }
61    }
62
63    public static void test() {
64        int[] src = new int[10];
65        init(src);
66        shift(src);
67        verify(src);
68    }
69
70    public static void main(String[] args) {
71        for (int i = 0; i < 2000; i++)
72            test();
73    }
74}