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 }