/* * 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions.
*/
/** * @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;
publicclass Test7100757 {
publicstaticfinalint NBITS = 256;
publicstaticvoid main(String[] args) {
BitSet bs = new BitSet(NBITS);
Random rnd = Utils.getRandomInstance(); long[] ra = newlong[(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);
}
}
staticvoid 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);
}
}
};
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