author | amlu |
Mon, 21 Oct 2019 14:04:16 +0800 | |
changeset 58700 | f87353679927 |
parent 47216 | test/jdk/java/math/BigInteger/DivisionOverflow.java@71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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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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/* |
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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 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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} |