Mercurial > hg > truffle
comparison test/compiler/5091921/Test6897150.java @ 3345:bad7ecd0b6ed
5091921: Sign flip issues in loop optimizer
Summary: Fix integer overflow problem in the code generated by loop optimizer.
Reviewed-by: never
author | kvn |
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date | Wed, 04 May 2011 13:12:42 -0700 |
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3344:0139aac70fb5 | 3345:bad7ecd0b6ed |
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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 |