809N/A/*
2362N/A * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
809N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
809N/A *
809N/A * This code is free software; you can redistribute it and/or modify it
809N/A * under the terms of the GNU General Public License version 2 only, as
809N/A * published by the Free Software Foundation.
809N/A *
809N/A * This code is distributed in the hope that it will be useful, but WITHOUT
809N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
809N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
809N/A * version 2 for more details (a copy is included in the LICENSE file that
809N/A * accompanied this code).
809N/A *
809N/A * You should have received a copy of the GNU General Public License version
809N/A * 2 along with this work; if not, write to the Free Software Foundation,
809N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
809N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
809N/A */
809N/A
809N/A/*
809N/A * @test
809N/A * @bug 4495754
809N/A * @summary Basic test for int bit twiddling
809N/A * @author Josh Bloch
809N/A */
809N/A
809N/Aimport java.util.Random;
809N/Aimport static java.lang.Integer.*;
809N/A
809N/Apublic class BitTwiddle {
809N/A private static final int N = 1000; // # of repetitions per test
809N/A
809N/A public static void main(String args[]) {
809N/A Random rnd = new Random();
809N/A
809N/A if (highestOneBit(0) != 0)
809N/A throw new RuntimeException("a");
809N/A if (highestOneBit(-1) != MIN_VALUE)
809N/A throw new RuntimeException("b");
809N/A if (highestOneBit(1) != 1)
809N/A throw new RuntimeException("c");
809N/A
809N/A if (lowestOneBit(0) != 0)
809N/A throw new RuntimeException("d");
809N/A if (lowestOneBit(-1) != 1)
809N/A throw new RuntimeException("e");
809N/A if (lowestOneBit(MIN_VALUE) != MIN_VALUE)
809N/A throw new RuntimeException("f");
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A if (highestOneBit(x) != reverse(lowestOneBit(reverse(x))))
809N/A throw new RuntimeException("g: " + toHexString(x));
809N/A }
809N/A
809N/A if (numberOfLeadingZeros(0) != SIZE)
809N/A throw new RuntimeException("h");
809N/A if (numberOfLeadingZeros(-1) != 0)
809N/A throw new RuntimeException("i");
809N/A if (numberOfLeadingZeros(1) != (SIZE - 1))
809N/A throw new RuntimeException("j");
809N/A
809N/A if (numberOfTrailingZeros(0) != SIZE)
809N/A throw new RuntimeException("k");
809N/A if (numberOfTrailingZeros(1) != 0)
809N/A throw new RuntimeException("l");
809N/A if (numberOfTrailingZeros(MIN_VALUE) != (SIZE - 1))
809N/A throw new RuntimeException("m");
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A if (numberOfLeadingZeros(x) != numberOfTrailingZeros(reverse(x)))
809N/A throw new RuntimeException("n: " + toHexString(x));
809N/A }
809N/A
809N/A if (bitCount(0) != 0)
809N/A throw new RuntimeException("o");
809N/A
809N/A for (int i = 0; i < SIZE; i++) {
809N/A int pow2 = 1 << i;
809N/A if (bitCount(pow2) != 1)
809N/A throw new RuntimeException("p: " + i);
809N/A if (bitCount(pow2 -1) != i)
809N/A throw new RuntimeException("q: " + i);
809N/A }
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A if (bitCount(x) != bitCount(reverse(x)))
809N/A throw new RuntimeException("r: " + toHexString(x));
809N/A }
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A int dist = rnd.nextInt();
809N/A if (bitCount(x) != bitCount(rotateRight(x, dist)))
809N/A throw new RuntimeException("s: " + toHexString(x) +
809N/A toHexString(dist));
809N/A if (bitCount(x) != bitCount(rotateLeft(x, dist)))
809N/A throw new RuntimeException("t: " + toHexString(x) +
809N/A toHexString(dist));
809N/A if (rotateRight(x, dist) != rotateLeft(x, -dist))
809N/A throw new RuntimeException("u: " + toHexString(x) +
809N/A toHexString(dist));
809N/A if (rotateRight(x, -dist) != rotateLeft(x, dist))
809N/A throw new RuntimeException("v: " + toHexString(x) +
809N/A toHexString(dist));
809N/A }
809N/A
809N/A if (signum(0) != 0 || signum(1) != 1 || signum(-1) != -1
809N/A || signum(MIN_VALUE) != -1 || signum(MAX_VALUE) != 1)
809N/A throw new RuntimeException("w");
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A int sign = (x < 0 ? -1 : (x == 0 ? 0 : 1));
809N/A if (signum(x) != sign)
809N/A throw new RuntimeException("x: " + toHexString(x));
809N/A }
809N/A
809N/A if(reverseBytes(0xaabbccdd) != 0xddccbbaa)
809N/A throw new RuntimeException("y");
809N/A
809N/A for (int i = 0; i < N; i++) {
809N/A int x = rnd.nextInt();
809N/A if (bitCount(x) != bitCount(reverseBytes(x)))
809N/A throw new RuntimeException("z: " + toHexString(x));
809N/A }
809N/A }
809N/A}