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 6956668

    28  * @summary misbehavior of XOR operator (^) with int

    29  *

    30  * @run main/othervm -Xbatch Test6956668

    31  */

    32 

    33 

    34 public class Test6956668 {

    35 

    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 

    64    public static void main(String[] args) {

    65       for (int i = 0; i < 100000; i++) {

    66          int ct = bitTest();

    67       }

    68    }

    69 }