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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.  /** @addtogroup softfloat 
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef __SFTYPES_H__
  36. #define __SFTYPES_H__
  37.  
  38. #include <endian.h>
  39. #include <stdint.h>
  40.  
  41. typedef union {
  42.     float f;
  43.     uint32_t binary;
  44.  
  45.     struct  {
  46.         #if __BYTE_ORDER == __BIG_ENDIAN
  47.         uint32_t sign:1;
  48.         uint32_t exp:8;
  49.         uint32_t fraction:23;
  50.         #elif __BYTE_ORDER == __LITTLE_ENDIAN
  51.         uint32_t fraction:23;
  52.         uint32_t exp:8;
  53.         uint32_t sign:1;
  54.         #else
  55.             #error "Unknown endians."
  56.         #endif
  57.         } parts __attribute__ ((packed));
  58.     } float32;
  59.    
  60. typedef union {
  61.     double d;
  62.     uint64_t binary;
  63.    
  64.     struct  {
  65.         #if __BYTE_ORDER == __BIG_ENDIAN
  66.         uint64_t sign:1;
  67.         uint64_t exp:11;
  68.         uint64_t fraction:52;
  69.         #elif __BYTE_ORDER == __LITTLE_ENDIAN
  70.         uint64_t fraction:52;
  71.         uint64_t exp:11;
  72.         uint64_t sign:1;
  73.         #else
  74.             #error "Unknown endians."
  75.         #endif
  76.         } parts __attribute__ ((packed));
  77.     } float64;
  78.  
  79. #define FLOAT32_MAX 0x7f800000
  80. #define FLOAT32_MIN 0xff800000
  81. #define FLOAT64_MAX
  82. #define FLOAT64_MIN
  83.  
  84. /* For recognizing NaNs or infinity use isFloat32NaN and is Float32Inf, comparing with this constants is not sufficient */
  85. #define FLOAT32_NAN 0x7FC00001
  86. #define FLOAT32_SIGNAN 0x7F800001
  87. #define FLOAT32_INF 0x7F800000
  88.  
  89. #define FLOAT64_NAN 0x7FF8000000000001ll
  90. #define FLOAT64_SIGNAN 0x7FF0000000000001ll
  91. #define FLOAT64_INF 0x7FF0000000000000ll
  92.  
  93. #define FLOAT32_FRACTION_SIZE 23
  94. #define FLOAT64_FRACTION_SIZE 52
  95.  
  96. #define FLOAT32_HIDDEN_BIT_MASK 0x800000
  97. #define FLOAT64_HIDDEN_BIT_MASK 0x10000000000000ll
  98.  
  99. #define FLOAT32_MAX_EXPONENT 0xFF
  100. #define FLOAT64_MAX_EXPONENT 0x7FF
  101.  
  102. #define FLOAT32_BIAS 0x7F
  103. #define FLOAT64_BIAS 0x3FF
  104. #define FLOAT80_BIAS 0x3FFF
  105.  
  106.  
  107. #endif
  108.  
  109.  
  110.  /** @}
  111.  */
  112.  
  113.