1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8  *
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 /*
25  * @test
26  * @bug 8022780
27  * @summary Test division of large values
28  * @requires (sun.arch.data.model == "64" & 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 
main(String[] args)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 }
57