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comparison test/compiler/5091921/Test6897150.java @ 3345:bad7ecd0b6ed

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5091921: Sign flip issues in loop optimizer Summary: Fix integer overflow problem in the code generated by loop optimizer. Reviewed-by: never
author kvn
date Wed, 04 May 2011 13:12:42 -0700
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3344:0139aac70fb5 3345:bad7ecd0b6ed
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