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comparison test/compiler/5091921/Test6935022.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 6935022
28 * @summary Server VM incorrectly breaks out of while loop
29 *
30 * @run main Test6935022
31 */
32
33 public class Test6935022 {
34 public static final void main(String[] args) throws Exception {
35 Test6935022 test = new Test6935022();
36
37 int cnt = 0;
38
39 while (cnt < 10000) {
40 try {
41 ++cnt;
42 if ((cnt&1023) == 0)
43 System.out.println("Thread="+Thread.currentThread().getName() + " iteration: " + cnt);
44 test.loop(2147483647, (cnt&1023));
45 }
46
47 catch (Exception e) {
48 System.out.println("Caught on iteration " + cnt);
49 e.printStackTrace();
50 System.exit(97);
51 }
52 }
53 }
54
55 private void loop(int endingRow, int mask) throws Exception {
56 int rows = 1;
57 boolean next = true;
58
59 while(rows <= endingRow && next) {
60 rows++;
61 if (rows == mask)
62 System.out.println("Rows="+rows+", end="+endingRow+", next="+next);
63 next = next(rows);
64 }
65
66 if (next)
67 throw new Exception("Ended on rows(no rs): " + rows);
68 }
69
70 private boolean next(int rows) {
71 return rows < 12;
72 }
73 }
74