|
1 /* |
|
2 * Copyright (c) 2011, 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 6897150 |
|
28 * @summary Hotspot optimises away a valid loop |
|
29 * |
|
30 * @run main Test6897150 |
|
31 */ |
|
32 |
|
33 // Should be compiled with javac from JDK1.3 to get bytecode which shows the problem. |
|
34 public class Test6897150 { |
|
35 public static void main(String[] args) { |
|
36 // This works |
|
37 loopAndPrint(Integer.MAX_VALUE -1); |
|
38 // This doesn't |
|
39 loopAndPrint(Integer.MAX_VALUE); |
|
40 } |
|
41 |
|
42 static void verify(int max, int a) { |
|
43 if ( a != (max - 1)) { |
|
44 System.out.println("Expected: " + (max - 1)); |
|
45 System.out.println("Actual : " + a); |
|
46 System.exit(97); |
|
47 } |
|
48 } |
|
49 static void loopAndPrint(int max) { |
|
50 int a = -1; |
|
51 int i = 1; |
|
52 for (; i < max; i++) { |
|
53 a = i; |
|
54 } |
|
55 verify(max, a); |
|
56 } |
|
57 } |
|
58 |