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  *
  28  * @run main compiler.floatingpoint.NaNTest
  29  */
  30 
  31 package compiler.floatingpoint;
  32 
  33 public class NaNTest {
  34     static void testFloat() {
  35         int originalValue = 0x7f800001;
  36         int readBackValue = Float.floatToRawIntBits(Float.intBitsToFloat(originalValue));
  37         if (originalValue != readBackValue) {
  38             String errorMessage = String.format("Original and read back float values mismatch\n0x%X 0x%X\n",
  39                                                 originalValue,
  40                                                 readBackValue);
  41             throw new RuntimeException(errorMessage);
  42         } else {
  43             System.out.printf("Written and read back float values match\n0x%X 0x%X\n",
  44                               originalValue,
  45                               readBackValue);
  46         }
  47     }
  48 
  49     static void testDouble() {
  50         long originalValue = 0xFFF0000000000001L;
  51         long readBackValue = Double.doubleToRawLongBits(Double.longBitsToDouble(originalValue));
  52         if (originalValue != readBackValue) {
  53             String errorMessage = String.format("Original and read back double values mismatch\n0x%X 0x%X\n",
  54                                                 originalValue,
  55                                                 readBackValue);
  56             throw new RuntimeException(errorMessage);
  57         } else {
  58             System.out.printf("Written and read back double values match\n0x%X 0x%X\n",
  59                               originalValue,
  60                               readBackValue);
  61         }
  62 
  63     }
  64 
  65     public static void main(String args[]) {
  66         System.out.println("### NanTest started");
  67 
  68         testFloat();
  69         testDouble();
  70 
  71         System.out.println("### NanTest ended");
  72     }
  73 }