/*
* Copyright ( c ) 2011 , 2020 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
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*/
/**
* @ test
* @ key randomness
* @ bug 7100757
* @ summary The BitSet . nextSetBit ( ) produces incorrect result in 32 bit 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 = 1 L << 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 );
}
}
};
Messung V0.5 in Prozent C=88 H=91 G=89
¤ Dauer der Verarbeitung: 0.15 Sekunden
(vorverarbeitet am 2026-06-10)
¤
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