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/*
* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package test.java.lang.Math;
import java.math.BigInteger;
import org.testng.annotations.Test;
import static org.testng.Assert.assertEquals;
// Android-removed: Private constructor, main() method, randomness tests.
public class MultiplicationTests {
// Calculate high 64 bits of 128 product using BigInteger.
private static long multiplyHighBigInt(long x, long y) {
return BigInteger.valueOf(x).multiply(BigInteger.valueOf(y))
.shiftRight(64).longValue();
}
@Test
public void testMultiplyHigh() {
// check some boundary cases
long[][] v = new long[][]{
{0L, 0L},
{-1L, 0L},
{0L, -1L},
{1L, 0L},
{0L, 1L},
{-1L, -1L},
{-1L, 1L},
{1L, -1L},
{1L, 1L},
{Long.MAX_VALUE, Long.MAX_VALUE},
{Long.MAX_VALUE, -Long.MAX_VALUE},
{-Long.MAX_VALUE, Long.MAX_VALUE},
{-Long.MAX_VALUE, -Long.MAX_VALUE},
{Long.MAX_VALUE, Long.MIN_VALUE},
{Long.MIN_VALUE, Long.MAX_VALUE},
{Long.MIN_VALUE, Long.MIN_VALUE}
};
for (long[] xy : v) {
long x = xy[0];
long y = xy[1];
long p1 = multiplyHighBigInt(x, y);
long p2 = Math.multiplyHigh(x, y);
assertEquals(p1, p2);
}
}
}
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