sysdeps/ieee754/ldbl-128/ieee754.h

   1 /* Copyright (C) 1992-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _IEEE754_H
  19
  20 #define _IEEE754_H 1
  21 #include <features.h>
  22
  23 #include <endian.h>
  24
  25 __BEGIN_DECLS
  26
  27 union ieee754_float
  28   {
  29     float f;
  30
  31     /* This is the IEEE 754 single-precision format.  */
  32     struct
  33       {
  34 #if     __BYTE_ORDER == __BIG_ENDIAN
  35         unsigned int negative:1;
  36         unsigned int exponent:8;
  37         unsigned int mantissa:23;
  38 #endif                          /* Big endian.  */
  39 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  40         unsigned int mantissa:23;
  41         unsigned int exponent:8;
  42         unsigned int negative:1;
  43 #endif                          /* Little endian.  */
  44       } ieee;
  45
  46     /* This format makes it easier to see if a NaN is a signalling NaN.  */
  47     struct
  48       {
  49 #if     __BYTE_ORDER == __BIG_ENDIAN
  50         unsigned int negative:1;
  51         unsigned int exponent:8;
  52         unsigned int quiet_nan:1;
  53         unsigned int mantissa:22;
  54 #endif                          /* Big endian.  */
  55 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  56         unsigned int mantissa:22;
  57         unsigned int quiet_nan:1;
  58         unsigned int exponent:8;
  59         unsigned int negative:1;
  60 #endif                          /* Little endian.  */
  61       } ieee_nan;
  62   };
  63
  64 #define IEEE754_FLOAT_BIAS      0x7f /* Added to exponent.  */
  65
  66
  67 union ieee754_double
  68   {
  69     double d;
  70
  71     /* This is the IEEE 754 double-precision format.  */
  72     struct
  73       {
  74 #if     __BYTE_ORDER == __BIG_ENDIAN
  75         unsigned int negative:1;
  76         unsigned int exponent:11;
  77         /* Together these comprise the mantissa.  */
  78         unsigned int mantissa0:20;
  79         unsigned int mantissa1:32;
  80 #endif                          /* Big endian.  */
  81 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  82         /* Together these comprise the mantissa.  */
  83         unsigned int mantissa1:32;
  84         unsigned int mantissa0:20;
  85         unsigned int exponent:11;
  86         unsigned int negative:1;
  87 #endif                          /* Little endian.  */
  88       } ieee;
  89
  90     /* This format makes it easier to see if a NaN is a signalling NaN.  */
  91     struct
  92       {
  93 #if     __BYTE_ORDER == __BIG_ENDIAN
  94         unsigned int negative:1;
  95         unsigned int exponent:11;
  96         unsigned int quiet_nan:1;
  97         /* Together these comprise the mantissa.  */
  98         unsigned int mantissa0:19;
  99         unsigned int mantissa1:32;
 100 #else
 101         /* Together these comprise the mantissa.  */
 102         unsigned int mantissa1:32;
 103         unsigned int mantissa0:19;
 104         unsigned int quiet_nan:1;
 105         unsigned int exponent:11;
 106         unsigned int negative:1;
 107 #endif
 108       } ieee_nan;
 109   };
 110
 111 #define IEEE754_DOUBLE_BIAS     0x3ff /* Added to exponent.  */
 112
 113
 114 union ieee854_long_double
 115   {
 116     long double d;
 117
 118     /* This is the IEEE 854 quad-precision format.  */
 119     struct
 120       {
 121 #if     __BYTE_ORDER == __BIG_ENDIAN
 122         unsigned int negative:1;
 123         unsigned int exponent:15;
 124         /* Together these comprise the mantissa.  */
 125         unsigned int mantissa0:16;
 126         unsigned int mantissa1:32;
 127         unsigned int mantissa2:32;
 128         unsigned int mantissa3:32;
 129 #endif                          /* Big endian.  */
 130 #if     __BYTE_ORDER == __LITTLE_ENDIAN
 131         /* Together these comprise the mantissa.  */
 132         unsigned int mantissa3:32;
 133         unsigned int mantissa2:32;
 134         unsigned int mantissa1:32;
 135         unsigned int mantissa0:16;
 136         unsigned int exponent:15;
 137         unsigned int negative:1;
 138 #endif                          /* Little endian.  */
 139       } ieee;
 140
 141     /* This format makes it easier to see if a NaN is a signalling NaN.  */
 142     struct
 143       {
 144 #if     __BYTE_ORDER == __BIG_ENDIAN
 145         unsigned int negative:1;
 146         unsigned int exponent:15;
 147         unsigned int quiet_nan:1;
 148         /* Together these comprise the mantissa.  */
 149         unsigned int mantissa0:15;
 150         unsigned int mantissa1:32;
 151         unsigned int mantissa2:32;
 152         unsigned int mantissa3:32;
 153 #else
 154         /* Together these comprise the mantissa.  */
 155         unsigned int mantissa3:32;
 156         unsigned int mantissa2:32;
 157         unsigned int mantissa1:32;
 158         unsigned int mantissa0:15;
 159         unsigned int quiet_nan:1;
 160         unsigned int exponent:15;
 161         unsigned int negative:1;
 162 #endif
 163       } ieee_nan;
 164   };
 165
 166 #define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent.  */
 167
 168 __END_DECLS
 169
 170 #endif /* ieee754.h */