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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. #include <endian.h>
  33. #include <stdint.h>
  34.  
  35. typedef union {
  36.     float f;
  37.     uint32_t binary;
  38.  
  39.     struct  {
  40.         #if __BYTE_ORDER == __BIG_ENDIAN
  41.         uint32_t sign:1;
  42.         uint32_t exp:8;
  43.         uint32_t fraction:23;
  44.         #elif __BYTE_ORDER == __LITTLE_ENDIAN
  45.         uint32_t fraction:23;
  46.         uint32_t exp:8;
  47.         uint32_t sign:1;
  48.         #else
  49.             #error "Unknown endians."
  50.         #endif
  51.         } parts __attribute__ ((packed));
  52.     } float32;
  53.    
  54. typedef union {
  55.     double d;
  56.     uint64_t binary;
  57.    
  58.     struct  {
  59.         #if __BYTE_ORDER == __BIG_ENDIAN
  60.         uint64_t sign:1;
  61.         uint64_t exp:11;
  62.         uint64_t fraction:52;
  63.         #elif __BYTE_ORDER == __LITTLE_ENDIAN
  64.         uint64_t fraction:52;
  65.         uint64_t exp:11;
  66.         uint64_t sign:1;
  67.         #else
  68.             #error "Unknown endians."
  69.         #endif
  70.         } parts __attribute__ ((packed));
  71.     } float64;
  72.  
  73. #define FLOAT32_MAX 0x7f800000
  74. #define FLOAT32_MIN 0xff800000
  75. #define FLOAT64_MAX
  76. #define FLOAT64_MIN
  77.  
  78. /* For recognizing NaNs or infinity use isFloat32NaN and is Float32Inf, comparing with this constants is not sufficient */
  79. #define FLOAT32_NAN 0x7FC00001
  80. #define FLOAT32_SIGNAN 0x7F800001
  81. #define FLOAT32_INF 0x7F800000
  82.  
  83. #define FLOAT64_NAN 0x7FF8000000000001ll
  84. #define FLOAT64_SIGNAN 0x7FF0000000000001ll
  85. #define FLOAT64_INF 0x7FF0000000000000ll
  86.  
  87. #define FLOAT32_FRACTION_SIZE 23
  88. #define FLOAT64_FRACTION_SIZE 52
  89.  
  90. #define FLOAT32_HIDDEN_BIT_MASK 0x800000
  91. #define FLOAT64_HIDDEN_BIT_MASK 0x10000000000000ll
  92.  
  93. #define FLOAT32_MAX_EXPONENT 0xFF
  94. #define FLOAT64_MAX_EXPONENT 0x7FF
  95.  
  96. #define FLOAT32_BIAS 0x7F
  97. #define FLOAT64_BIAS 0x3FF
  98. #define FLOAT80_BIAS 0x3FFF
  99.  
  100.  
  101. #endif
  102.  
  103.