test/jdk/java/math/BigInteger/ExtremeShiftingTests.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 6371401
 * @summary Tests of shiftLeft and shiftRight on Integer.MIN_VALUE
 * @requires os.maxMemory >= 1g
 * @run main/othervm -Xmx512m ExtremeShiftingTests
 * @author Joseph D. Darcy
 */
import java.math.BigInteger;
import static java.math.BigInteger.*;

public class ExtremeShiftingTests {
    public static void main(String... args) {
        BigInteger bi = ONE.shiftLeft(Integer.MIN_VALUE);
        if (!bi.equals(ZERO))
            throw new RuntimeException("1 << " + Integer.MIN_VALUE);

        bi = ZERO.shiftLeft(Integer.MIN_VALUE);
        if (!bi.equals(ZERO))
            throw new RuntimeException("0 << " + Integer.MIN_VALUE);

        bi = BigInteger.valueOf(-1);
        bi = bi.shiftLeft(Integer.MIN_VALUE);
        if (!bi.equals(BigInteger.valueOf(-1)))
            throw new RuntimeException("-1 << " + Integer.MIN_VALUE);

        try {
            ONE.shiftRight(Integer.MIN_VALUE);
            throw new RuntimeException("1 >> " + Integer.MIN_VALUE);
        } catch (ArithmeticException ae) {
            ; // Expected
        }

        bi = ZERO.shiftRight(Integer.MIN_VALUE);
        if (!bi.equals(ZERO))
            throw new RuntimeException("0 >> " + Integer.MIN_VALUE);

        try {
            BigInteger.valueOf(-1).shiftRight(Integer.MIN_VALUE);
            throw new RuntimeException("-1 >> " + Integer.MIN_VALUE);
        } catch (ArithmeticException ae) {
            ; // Expected
        }

    }
}