Test7100757.java

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/**
 * @test
 * @key randomness
 * @bug 7100757
 * @summary The BitSet.nextSetBit() produces incorrect result in 32bit VM on Sparc
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 *
 * @run main/timeout=300 compiler.codegen.Test7100757
 */

package compiler.codegen;

import jdk.test.lib.Utils;

import java.util.BitSet;
import java.util.Random;

public class Test7100757 {

  public static final int NBITS = 256;

  public static void main(String[] args) {

    BitSet bs = new BitSet(NBITS);
    Random rnd = Utils.getRandomInstance();
    long[] ra = new long[(NBITS+63)/64];

    for(int l=0; l < 5000000; l++) {

      for(int r = 0; r < ra.length; r++) {
        ra[r] = rnd.nextLong();
      }
      test(ra, bs);
    }
  }

  static void test(long[] ra, BitSet bs) {
      bs.clear();
      int bits_set = 0;
      for(int i = 0, t = 0, b = 0; i < NBITS; i++) {
        long bit = 1L << b++;
        if((ra[t]&bit) != 0) {
          bs.set(i);
          bits_set++;
        }
        if(b == 64) {
          t++;
          b = 0;
        }
      }
      // Test Long.bitCount()
      int check_bits = bs.cardinality();
      if (check_bits != bits_set) {
        String bs_str = bs.toString();
        System.err.printf("cardinality bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
        System.exit(97);
      }
      // Test Long.numberOfTrailingZeros()
      check_bits = 0;
      for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
        check_bits++;
      }
      if (check_bits != bits_set) {
        String bs_str = bs.toString();
        System.err.printf("nextSetBit bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
        System.exit(97);
      }
      // Test Long.numberOfLeadingZeros()
      for(int i = bs.length(); i > 0; i = bs.length()) {
        bs.clear(i-1);
      }
      // Test Long.bitCount()
      check_bits = bs.cardinality();
      if (check_bits != 0) {
        String bs_str = bs.toString();
        System.err.printf("after clear bits: %d != 0  bs: %s\n", check_bits, bs_str);
        System.exit(97);
      }
  }

};