1 /* 2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.jtt.hotspot; 24 25 import org.graalvm.compiler.jtt.JTTTest; 26 import org.junit.Test; 27 28 public class Test6959129 extends JTTTest { 29 30 public static long test() { 31 int min = Integer.MAX_VALUE - 30000; 32 int max = Integer.MAX_VALUE; 33 return maxMoves(min, max); 34 } 35 36 /** 37 * Imperative implementation that returns the length hailstone moves for a given number. 38 */ 39 public static long hailstoneLengthImp(long n2) { 40 long n = n2; 41 long moves = 0; 42 while (n != 1) { 43 if (n <= 1) { 44 throw new IllegalStateException(); 45 } 46 if (isEven(n)) { 47 n = n / 2; 48 } else { 49 n = 3 * n + 1; 50 } 51 ++moves; 52 } 53 return moves; 54 } 55 56 private static boolean isEven(long n) { 57 return n % 2 == 0; 58 } 59 60 /** 61 * Returns the maximum length of the hailstone sequence for numbers between min to max. 62 * 63 * For rec1 - Assume that min is bigger than max. 64 */ 65 public static long maxMoves(int min, int max) { 66 long maxmoves = 0; 67 for (int n = min; n <= max; n++) { 68 long moves = hailstoneLengthImp(n); 69 if (moves > maxmoves) { 70 maxmoves = moves; 71 } 72 } 73 return maxmoves; 74 } 75 76 @Test(timeout = 20000) 77 public void run0() throws Throwable { 78 initializeForTimeout(); 79 runTest("test"); 80 } 81 82 }