test/hotspot/jtreg/compiler/floatingpoint/NaNTest.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
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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).
 *
 * 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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 */
/**
 * @test
 * @bug 8076373
 * @summary Verify if signaling NaNs are preserved.
 *
 * @run main compiler.floatingpoint.NaNTest
 */

package compiler.floatingpoint;

public class NaNTest {
    static void testFloat() {
        int originalValue = 0x7f800001;
        int readBackValue = Float.floatToRawIntBits(Float.intBitsToFloat(originalValue));
        if (originalValue != readBackValue) {
            String errorMessage = String.format("Original and read back float values mismatch\n0x%X 0x%X\n",
                                                originalValue,
                                                readBackValue);
            throw new RuntimeException(errorMessage);
        } else {
            System.out.printf("Written and read back float values match\n0x%X 0x%X\n",
                              originalValue,
                              readBackValue);
        }
    }

    static void testDouble() {
        long originalValue = 0xFFF0000000000001L;
        long readBackValue = Double.doubleToRawLongBits(Double.longBitsToDouble(originalValue));
        if (originalValue != readBackValue) {
            String errorMessage = String.format("Original and read back double values mismatch\n0x%X 0x%X\n",
                                                originalValue,
                                                readBackValue);
            throw new RuntimeException(errorMessage);
        } else {
            System.out.printf("Written and read back double values match\n0x%X 0x%X\n",
                              originalValue,
                              readBackValue);
        }

    }

    public static void main(String args[]) {
        System.out.println("### NanTest started");

        testFloat();
        testDouble();

        System.out.println("### NanTest ended");
    }
}