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