1 /*
   2  * Copyright (c) 2011, 2015, 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 7100757
  28  * @summary The BitSet.nextSetBit() produces incorrect result in 32bit VM on Sparc
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  *
  33  * @run main/timeout=300 compiler.codegen.Test7100757
  34  */
  35 
  36 package compiler.codegen;
  37 
  38 import jdk.test.lib.Utils;
  39 
  40 import java.util.BitSet;
  41 import java.util.Random;
  42 
  43 public class Test7100757 {
  44 
  45   public static final int NBITS = 256;
  46 
  47   public static void main(String[] args) {
  48 
  49     BitSet bs = new BitSet(NBITS);
  50     Random rnd = Utils.getRandomInstance();
  51     long[] ra = new long[(NBITS+63)/64];
  52 
  53     for(int l=0; l < 5000000; l++) {
  54 
  55       for(int r = 0; r < ra.length; r++) {
  56         ra[r] = rnd.nextLong();
  57       }
  58       test(ra, bs);
  59     }
  60   }
  61 
  62   static void test(long[] ra, BitSet bs) {
  63       bs.clear();
  64       int bits_set = 0;
  65       for(int i = 0, t = 0, b = 0; i < NBITS; i++) {
  66         long bit = 1L << b++;
  67         if((ra[t]&bit) != 0) {
  68           bs.set(i);
  69           bits_set++;
  70         }
  71         if(b == 64) {
  72           t++;
  73           b = 0;
  74         }
  75       }
  76       // Test Long.bitCount()
  77       int check_bits = bs.cardinality();
  78       if (check_bits != bits_set) {
  79         String bs_str = bs.toString();
  80         System.err.printf("cardinality bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
  81         System.exit(97);
  82       }
  83       // Test Long.numberOfTrailingZeros()
  84       check_bits = 0;
  85       for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
  86         check_bits++;
  87       }
  88       if (check_bits != bits_set) {
  89         String bs_str = bs.toString();
  90         System.err.printf("nextSetBit bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
  91         System.exit(97);
  92       }
  93       // Test Long.numberOfLeadingZeros()
  94       for(int i = bs.length(); i > 0; i = bs.length()) {
  95         bs.clear(i-1);
  96       }
  97       // Test Long.bitCount()
  98       check_bits = bs.cardinality();
  99       if (check_bits != 0) {
 100         String bs_str = bs.toString();
 101         System.err.printf("after clear bits: %d != 0  bs: %s\n", check_bits, bs_str);
 102         System.exit(97);
 103       }
 104   }
 105 
 106 };