1 /* 2 * Copyright (c) 2011, 2019, 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 24 /* 25 * @test 26 * @bug 8022780 27 * @summary Test division of large values 28 * @requires os.maxMemory > 8g 29 * @run main/othervm -Xshare:off -Xmx8g DivisionOverflow 30 * @author Dmitry Nadezhin 31 */ 32 import java.math.BigInteger; 33 34 public class DivisionOverflow { 35 36 public static void main(String[] args) { 37 try { 38 BigInteger a = BigInteger.ONE.shiftLeft(2147483646); 39 BigInteger b = BigInteger.ONE.shiftLeft(1568); 40 BigInteger[] qr = a.divideAndRemainder(b); 41 BigInteger q = qr[0]; 42 BigInteger r = qr[1]; 43 if (!r.equals(BigInteger.ZERO)) { 44 throw new RuntimeException("Incorrect signum() of remainder " + r.signum()); 45 } 46 if (q.bitLength() != 2147482079) { 47 throw new RuntimeException("Incorrect bitLength() of quotient " + q.bitLength()); 48 } 49 System.out.println("Division of large values passed without overflow."); 50 } catch (OutOfMemoryError e) { 51 // possible 52 System.err.println("DivisionOverflow skipped: OutOfMemoryError"); 53 System.err.println("Run jtreg with -javaoption:-Xmx8g"); 54 } 55 } 56 }