| /* |
| * Copyright (c) 2011, 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 |
| * @bug 6959129 |
| * @summary COMPARISON WITH INTEGER.MAX_INT DOES NOT WORK CORRECTLY IN THE CLIENT VM. |
| * |
| * @run main/othervm -ea Test6959129 |
| */ |
| |
| public class Test6959129 { |
| |
| public static void main(String[] args) { |
| long start = System.currentTimeMillis(); |
| int min = Integer.MAX_VALUE-30000; |
| int max = Integer.MAX_VALUE; |
| long maxmoves = 0; |
| try { |
| maxmoves = maxMoves(min, max); |
| } catch (AssertionError e) { |
| System.out.println("Passed"); |
| System.exit(95); |
| } |
| System.out.println("maxMove:" + maxmoves); |
| System.out.println("FAILED"); |
| System.exit(97); |
| } |
| /** |
| * Imperative implementation that returns the length hailstone moves |
| * for a given number. |
| */ |
| public static long hailstoneLengthImp(long n) { |
| long moves = 0; |
| while (n != 1) { |
| assert n > 1; |
| if (isEven(n)) { |
| n = n / 2; |
| } else { |
| n = 3 * n + 1; |
| } |
| ++moves; |
| } |
| return moves; |
| } |
| |
| private static boolean isEven(long n) { |
| return n % 2 == 0; |
| } |
| |
| /** |
| * Returns the maximum length of the hailstone sequence for numbers |
| * between min to max. |
| * |
| * For rec1 - Assume that min is bigger than max. |
| */ |
| public static long maxMoves(int min, int max) { |
| long maxmoves = 0; |
| for (int n = min; n <= max; n++) { |
| if ((n & 1023) == 0) System.out.println(n); |
| long moves = hailstoneLengthImp(n); |
| if (moves > maxmoves) { |
| maxmoves = moves; |
| } |
| } |
| return maxmoves; |
| } |
| } |
| |