test/langtools/tools/javac/lambda/LambdaTestStrictFP.java

/*
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 * 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.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8046060
 * @summary Different results of floating point multiplication for lambda code block
 */

strictfp
public class LambdaTestStrictFP {

    static double fld =  eval(() -> {
            double x = Double.longBitsToDouble(0x1e7ee00000000000L);
            double y = Double.longBitsToDouble(0x2180101010101010L);

            return x * y;
        });

    public static void main(String args[]) {
        double result = eval(() -> {
            double x = Double.longBitsToDouble(0x1e7ee00000000000L);
            double y = Double.longBitsToDouble(0x2180101010101010L);

            return x * y;
        });
        {
            double x = Double.longBitsToDouble(0x1e7ee00000000000L);
            double y = Double.longBitsToDouble(0x2180101010101010L);

            double z = x * y;
            check(z, result, "method");
            check(z, fld, "field");
        }
    }

    private static void check(double expected, double got, String where) {
        if (got != expected) {
            throw new AssertionError(where + ": Non-strictfp " + got + " != " + expected);
        }
    }

    private static double eval(Face arg) {
        return arg.m();
    }

    private interface Face {
        double m();
    }
}