Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/Java/Openjdk/test/jdk/java/lang/Math/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 6 kB

Quelle RoundTests.java Sprache: JAVA

/*
* Copyright (c) 2011, 2022, 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.
*/

/*
* @test
* @bug 6430675 8010430
* @summary Check for correct implementation of {Math, StrictMath}.round
* @run main/othervm -XX:Tier3CompileThreshold=50 -XX:CompileThresholdScaling=0.01 -XX:+TieredCompilation RoundTests
*/
public class RoundTests {
    public static void main(String... args) {
        int failures = 0;
        for (int i = 0; i < 500; i++) {
            failures += testNearFloatHalfCases();
            failures += testNearDoubleHalfCases();
            failures += testUnityULPCases();
            failures += testSpecialCases();

            if (failures > 0) {
                System.err.println("Testing {Math, StrictMath}.round incurred "
                                   + failures + " failures.");
                throw new RuntimeException();
            }
        }
    }

    private static int testNearDoubleHalfCases() {
        int failures = 0;
        double [][] testCases = {
            {+0x1.fffffffffffffp-2,  0.0},
            {+0x1.0p-1,              1.0}, // +0.5
            {+0x1.0000000000001p-1,  1.0},

            {-0x1.fffffffffffffp-2,  0.0},
            {-0x1.0p-1,              0.0}, // -0.5
            {-0x1.0000000000001p-1, -1.0},
        };

        for(double[] testCase : testCases) {
            failures += testNearHalfCases(testCase[0], (long)testCase[1]);
        }

        return failures;
    }

    private static int testNearHalfCases(double input, double expected) {
        int failures = 0;

        failures += Tests.test("Math.round",        input, Math::round,       expected);
        failures += Tests.test("StrictMath.round",  input, StrictMath::round, expected);

        return failures;
    }

    private static int testNearFloatHalfCases() {
        int failures = 0;
        float [][] testCases = {
            {+0x1.fffffep-2f,  0.0f},
            {+0x1.0p-1f,       1.0f}, // +0.5
            {+0x1.000002p-1f,  1.0f},

            {-0x1.fffffep-2f,  0.0f},
            {-0x1.0p-1f,       0.0f}, // -0.5
            {-0x1.000002p-1f, -1.0f},
        };

        for(float[] testCase : testCases) {
            failures += testNearHalfCases(testCase[0], (int)testCase[1]);
        }

        return failures;
    }

    private static int testNearHalfCases(float input, float expected) {
        int failures = 0;

        failures += Tests.test("Math.round",        input, Math.round(input),       expected);
        failures += Tests.test("StrictMath.round",  input, StrictMath.round(input), expected);

        return failures;
    }

    private static int testUnityULPCases() {
        int failures = 0;
        for (float sign : new float[]{-1, 1}) {
            for (float v1 : new float[]{1 << 23, 1 << 24}) {
                for (int k = -5; k <= 5; k++) {
                    float value = (v1 + k) * sign;
                    float actual = Math.round(value);
                    failures += Tests.test("Math.round", value, actual, value);
                }
            }
        }

        if (failures != 0) {
            System.out.println();
        }

        for (double sign : new double[]{-1, 1}) {
            for (double v1 : new double[]{1L << 52, 1L << 53}) {
                for (int k = -5; k <= 5; k++) {
                    double value = (v1 + k) * sign;
                    double actual = Math.round(value);
                    failures += Tests.test("Math.round", value, actual, value);
                }
            }
        }

        return failures;
    }

    private static int testSpecialCases() {
        int failures = 0;

        failures += Tests.test("Math.round", Float.NaN, Math.round(Float.NaN), 0.0F);
        failures += Tests.test("Math.round", Float.POSITIVE_INFINITY,
                Math.round(Float.POSITIVE_INFINITY), Integer.MAX_VALUE);
        failures += Tests.test("Math.round", Float.NEGATIVE_INFINITY,
                Math.round(Float.NEGATIVE_INFINITY), Integer.MIN_VALUE);
        failures += Tests.test("Math.round", -(float)Integer.MIN_VALUE,
                Math.round(-(float)Integer.MIN_VALUE), Integer.MAX_VALUE);
        failures += Tests.test("Math.round", (float) Integer.MIN_VALUE,
                Math.round((float) Integer.MIN_VALUE), Integer.MIN_VALUE);
        failures += Tests.test("Math.round", 0F, Math.round(0F), 0.0F);
        failures += Tests.test("Math.round", Float.MIN_VALUE,
                Math.round(Float.MIN_VALUE), 0.0F);
        failures += Tests.test("Math.round", -Float.MIN_VALUE,
                Math.round(-Float.MIN_VALUE), 0.0F);

        failures += Tests.test("Math.round", Double.NaN,               Math::round, 0.0);
        failures += Tests.test("Math.round", Double.POSITIVE_INFINITY, Math::round, Long.MAX_VALUE);
        failures += Tests.test("Math.round", Double.NEGATIVE_INFINITY, Math::round, Long.MIN_VALUE);
        failures += Tests.test("Math.round", -(double)Long.MIN_VALUE,  Math::round, Long.MAX_VALUE);
        failures += Tests.test("Math.round", (double) Long.MIN_VALUE,  Math::round, Long.MIN_VALUE);
        failures += Tests.test("Math.round", 0,                        Math::round, 0.0);
        failures += Tests.test("Math.round", Double.MIN_VALUE,         Math::round, 0.0);
        failures += Tests.test("Math.round", -Double.MIN_VALUE,        Math::round, 0.0);

        return failures;
    }
}

quality91%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.