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comparison test/compiler/loopopts/TestDeadBackbranchArrayAccess.java @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 5b8e0f84f00f
children
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20184:84105dcdb05b 20804:7848fc12602b
1 /*
2 * Copyright (c) 2014, 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 /**
26 * @test
27 * @bug 8054478
28 * @summary dead backbranch in main loop results in erroneous array access
29 * @run main/othervm -XX:CompileOnly=TestDeadBackbranchArrayAccess -Xcomp TestDeadBackbranchArrayAccess
30 *
31 */
32
33 public class TestDeadBackbranchArrayAccess {
34 static char[] pattern0 = {0};
35 static char[] pattern1 = {1};
36
37 static void test(char[] array) {
38 if (pattern1 == null) return;
39
40 int i = 0;
41 int pos = 0;
42 char c = array[pos];
43
44 while (i >= 0 && (c == pattern0[i] || c == pattern1[i])) {
45 i--;
46 pos--;
47 if (pos != -1) {
48 c = array[pos];
49 }
50 }
51 }
52
53 public static void main(String[] args) {
54 for (int i = 0; i < 1000000; i++) {
55 test(new char[1]);
56 }
57 }
58 }