57 lines
2.2 KiB
Java
57 lines
2.2 KiB
Java
/*
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* Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8022780
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* @summary Test division of large values
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* @requires (sun.arch.data.model == "64" & os.maxMemory > 8g)
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* @run main/othervm -Xshare:off -Xmx8g DivisionOverflow
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* @author Dmitry Nadezhin
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*/
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import java.math.BigInteger;
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public class DivisionOverflow {
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public static void main(String[] args) {
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try {
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BigInteger a = BigInteger.ONE.shiftLeft(2147483646);
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BigInteger b = BigInteger.ONE.shiftLeft(1568);
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BigInteger[] qr = a.divideAndRemainder(b);
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BigInteger q = qr[0];
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BigInteger r = qr[1];
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if (!r.equals(BigInteger.ZERO)) {
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throw new RuntimeException("Incorrect signum() of remainder " + r.signum());
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}
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if (q.bitLength() != 2147482079) {
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throw new RuntimeException("Incorrect bitLength() of quotient " + q.bitLength());
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}
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System.out.println("Division of large values passed without overflow.");
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} catch (OutOfMemoryError e) {
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// possible
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System.err.println("DivisionOverflow skipped: OutOfMemoryError");
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System.err.println("Run jtreg with -javaoption:-Xmx8g");
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}
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}
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}
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