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  1. /*
  2.  * Copyright (C) 2005 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __SFTYPES_H__
  30. #define __SFTYPES_H__
  31.  
  32. typedef union {
  33.     float f;
  34.     __u32 binary;
  35.  
  36.     struct  {
  37.         #ifdef __BIG_ENDIAN__
  38.         __u32 sign:1;
  39.         __u32 exp:8;
  40.         __u32 mantisa:23;
  41.         #elif defined __LITTLE_ENDIAN__
  42.         __u32 mantisa:23;
  43.         __u32 exp:8;
  44.         __u32 sign:1;
  45.         #else
  46.         #error "Unknown endians."
  47.         #endif
  48.         } parts __attribute__ ((packed));
  49.     } float32;
  50.    
  51. typedef union {
  52.     double d;
  53.     __u64 binary;
  54.    
  55.     struct  {
  56.         #ifdef __BIG_ENDIAN__
  57.         __u64 sign:1;
  58.         __u64 exp:11;
  59.         __u64 mantisa:52;
  60.         #elif defined __LITTLE_ENDIAN__
  61.         __u64 mantisa:52;
  62.         __u64 exp:11;
  63.         __u64 sign:1;
  64.         #else
  65.         #error "Unknown endians."
  66.         #endif
  67.         } parts __attribute__ ((packed));
  68.     } float64;
  69.  
  70. #define FLOAT32_MAX 0x7f800000
  71. #define FLOAT32_MIN 0xff800000
  72. #define FLOAT64_MAX
  73. #define FLOAT64_MIN
  74.  
  75. /* For recognizing NaNs or infinity use isFloat32NaN and is Float32Inf, comparing with this constants is not sufficient */
  76. #define FLOAT32_NAN 0x7FC00001
  77. #define FLOAT32_SIGNAN 0x7F800001
  78. #define FLOAT32_INF 0x7F800000
  79.  
  80. #define FLOAT64_NAN 0x7FF8000000000001ll
  81. #define FLOAT64_SIGNAN 0x7FF0000000000001ll
  82. #define FLOAT64_INF 0x7FF0000000000000ll
  83.  
  84. #define FLOAT32_MANTISA_SIZE 23
  85. #define FLOAT64_MANTISA_SIZE 52
  86.  
  87. #define FLOAT32_HIDDEN_BIT_MASK 0x800000
  88. #define FLOAT64_HIDDEN_BIT_MASK 0x10000000000000ll
  89.  
  90. #define FLOAT32_MAX_EXPONENT 0xFF
  91. #define FLOAT64_MAX_EXPONENT 0x7FF
  92.  
  93. #define FLOAT32_BIAS 0x7F
  94. #define FLOAT64_BIAS 0x3FF
  95. #define FLOAT80_BIAS 0x3FFF
  96.  
  97.  
  98. #endif
  99.  
  100.