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  * @test
26  * @bug 6956668
27  * @summary misbehavior of XOR operator (^) with int
28  *
29  * @run main/othervm -Xbatch compiler.c2.Test6956668
30  */
31 
32 package compiler.c2;
33 
34 public class Test6956668 {
35 
bitTest()36    public static int bitTest() {
37       int result = 0;
38 
39       int testValue = 73;
40       int bitCount = Integer.bitCount(testValue);
41 
42       if (testValue != 0) {
43          int gap = Long.numberOfTrailingZeros(testValue);
44          testValue >>>= gap;
45 
46          while (testValue != 0) {
47             result++;
48 
49             if ((testValue ^= 0x1) != 0) {
50                gap = Long.numberOfTrailingZeros(testValue);
51                testValue >>>= gap;
52             }
53          }
54       }
55 
56       if (bitCount != result) {
57          System.out.println("ERROR: " + bitCount + " != " + result);
58          System.exit(97);
59       }
60 
61       return (result);
62    }
63 
main(String[] args)64    public static void main(String[] args) {
65       for (int i = 0; i < 100000; i++) {
66          int ct = bitTest();
67       }
68    }
69 }
70