1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 /**

    24  * @test

    25  * @bug 8076373

    26  * @summary Verify if signaling NaNs are preserved.

    27  * @run main NaNTest

    28  */

    29 public class NaNTest {

    30     static void testFloat() {

    31         int originalValue = 0x7f800001;

    32         int readBackValue = Float.floatToRawIntBits(Float.intBitsToFloat(originalValue));

    33         if (originalValue != readBackValue) {

    34             String errorMessage = String.format("Original and read back float values mismatch\n0x%X 0x%X\n",

    35                                                 originalValue,

    36                                                 readBackValue);

    37             throw new RuntimeException(errorMessage);

    38         } else {

    39             System.out.printf("Written and read back float values match\n0x%X 0x%X\n",

    40                               originalValue,

    41                               readBackValue);

    42         }

    43     }

    44 

    45     static void testDouble() {

    46         long originalValue = 0xFFF0000000000001L;

    47         long readBackValue = Double.doubleToRawLongBits(Double.longBitsToDouble(originalValue));

    48         if (originalValue != readBackValue) {

    49             String errorMessage = String.format("Original and read back double values mismatch\n0x%X 0x%X\n",

    50                                                 originalValue,

    51                                                 readBackValue);

    52             throw new RuntimeException(errorMessage);

    53         } else {

    54             System.out.printf("Written and read back double values match\n0x%X 0x%X\n",

    55                               originalValue,

    56                               readBackValue);

    57         }

    58 

    59     }

    60 

    61     public static void main(String args[]) {

    62         System.out.println("### NanTest started");

    63 

    64         testFloat();

    65         testDouble();

    66 

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

    68     }

    69 }