114 lines
4.5 KiB
Java
114 lines
4.5 KiB
Java
/*
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* Copyright (c) 1998, 2022, 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 4101566 4831589
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* @summary Check for correct implementation of Math.rint(double)
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*/
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public class Rint {
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static int testRintCase(double input, double expected) {
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int failures = 0;
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double result;
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failures += Tests.test("Math.rint", input, Math::rint, expected);
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failures += Tests.test("Math.rint", -input, Math::rint, -expected);
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failures += Tests.test("StrictMath.rint", input, StrictMath::rint, expected);
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failures += Tests.test("StrictMath.rint", -input, StrictMath::rint, -expected);
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return failures;
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}
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public static void main(String... args) {
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int failures = 0;
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double twoToThe52 = Math.scalb(1.0, 52); // 2^52
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double [][] testCases = {
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{0.0, 0.0},
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{Double.MIN_VALUE, 0.0},
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{Math.nextDown(Double.MIN_NORMAL), 0.0},
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{Double.MIN_NORMAL, 0.0},
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{0.2, 0.0},
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{Math.nextDown(0.5), 0.0},
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{ 0.5, 0.0},
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{ Math.nextUp(0.5), 1.0},
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{0.7, 1.0},
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{Math.nextDown(1.0), 1.0},
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{ 1.0, 1.0},
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{ Math.nextUp(1.0), 1.0},
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{Math.nextDown(1.5), 1.0},
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{ 1.5, 2.0},
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{ Math.nextUp(1.5), 2.0},
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{4.2, 4.0},
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{4.5, 4.0},
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{4.7, 5.0},
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{7.5, 8.0},
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{7.2, 7.0},
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{7.7, 8.0},
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{150000.75, 150001.0},
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{300000.5, 300000.0},
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{Math.nextUp(300000.5), 300001.0},
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{Math.nextDown(300000.75), 300001.0},
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{300000.75, 300001.0},
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{Math.nextUp(300000.75), 300001.0},
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{300000.99, 300001.0},
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{262144.75, 262145.0}, //(2^18 ) + 0.75
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{499998.75, 499999.0},
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{524287.75, 524288.0}, //(2^19 -1) + 0.75
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{524288.75, 524289.0},
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{Math.nextDown(twoToThe52), twoToThe52},
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{twoToThe52, twoToThe52},
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{Math.nextUp(twoToThe52), Math.nextUp(twoToThe52)},
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{Double.MAX_VALUE, Double.MAX_VALUE},
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{Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY},
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{Double.NaN, Double.NaN}
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};
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for(int i = 0; i < testCases.length; i++) {
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failures += testRintCase(testCases[i][0], testCases[i][1]);
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}
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// Test values throughout exponent range
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for(double d = Double.MIN_VALUE;
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d < Double.POSITIVE_INFINITY; d *= 2) {
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failures += testRintCase(d, ((d<=0.5)?0.0:d));
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}
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if (failures > 0) {
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System.err.println("Testing {Math, StrictMath}.rint incurred "
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+ failures + " failures.");
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throw new RuntimeException();
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}
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}
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}
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