sysdeps/sparc/sparc32/ieee754.h

   1 /* Copyright (C) 1992, 1995, 1996, 1999 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _IEEE754_H
  20
  21 #define _IEEE754_H 1
  22 #include <features.h>
  23
  24 #include <endian.h>
  25
  26 __BEGIN_DECLS
  27
  28 union ieee754_float
  29   {
  30     float f;
  31
  32     /* This is the IEEE 754 single-precision format.  */
  33     struct
  34       {
  35 #if     __BYTE_ORDER == __BIG_ENDIAN
  36         unsigned int negative:1;
  37         unsigned int exponent:8;
  38         unsigned int mantissa:23;
  39 #endif                          /* Big endian.  */
  40 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  41         unsigned int mantissa:23;
  42         unsigned int exponent:8;
  43         unsigned int negative:1;
  44 #endif                          /* Little endian.  */
  45       } ieee;
  46
  47     /* This format makes it easier to see if a NaN is a signalling NaN.  */
  48     struct
  49       {
  50 #if     __BYTE_ORDER == __BIG_ENDIAN
  51         unsigned int negative:1;
  52         unsigned int exponent:8;
  53         unsigned int quiet_nan:1;
  54         unsigned int mantissa:22;
  55 #endif                          /* Big endian.  */
  56 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  57         unsigned int mantissa:22;
  58         unsigned int quiet_nan:1;
  59         unsigned int exponent:8;
  60         unsigned int negative:1;
  61 #endif                          /* Little endian.  */
  62       } ieee_nan;
  63   };
  64
  65 #define IEEE754_FLOAT_BIAS      0x7f /* Added to exponent.  */
  66
  67
  68 union ieee754_double
  69   {
  70     double d;
  71
  72     /* This is the IEEE 754 double-precision format.  */
  73     struct
  74       {
  75 #if     __BYTE_ORDER == __BIG_ENDIAN
  76         unsigned int negative:1;
  77         unsigned int exponent:11;
  78         /* Together these comprise the mantissa.  */
  79         unsigned int mantissa0:20;
  80         unsigned int mantissa1:32;
  81 #endif                          /* Big endian.  */
  82 #if     __BYTE_ORDER == __LITTLE_ENDIAN
  83         /* Together these comprise the mantissa.  */
  84         unsigned int mantissa1:32;
  85         unsigned int mantissa0:20;
  86         unsigned int exponent:11;
  87         unsigned int negative:1;
  88 #endif                          /* Little endian.  */
  89       } ieee;
  90
  91     /* This format makes it easier to see if a NaN is a signalling NaN.  */
  92     struct
  93       {
  94 #if     __BYTE_ORDER == __BIG_ENDIAN
  95         unsigned int negative:1;
  96         unsigned int exponent:11;
  97         unsigned int quiet_nan:1;
  98         /* Together these comprise the mantissa.  */
  99         unsigned int mantissa0:19;
 100         unsigned int mantissa1:32;
 101 #else
 102         /* Together these comprise the mantissa.  */
 103         unsigned int mantissa1:32;
 104         unsigned int mantissa0:19;
 105         unsigned int quiet_nan:1;
 106         unsigned int exponent:11;
 107         unsigned int negative:1;
 108 #endif
 109       } ieee_nan;
 110   };
 111
 112 #define IEEE754_DOUBLE_BIAS     0x3ff /* Added to exponent.  */
 113
 114
 115 union ieee854_long_double
 116   {
 117     long double d;
 118
 119     /* This is the IEEE 854 quad-precision format.  */
 120     struct
 121       {
 122 #if     __BYTE_ORDER == __BIG_ENDIAN
 123         unsigned int negative:1;
 124         unsigned int exponent:15;
 125         /* Together these comprise the mantissa.  */
 126         unsigned int mantissa0:16;
 127         unsigned int mantissa1:32;
 128         unsigned int mantissa2:32;
 129         unsigned int mantissa3:32;
 130 #endif                          /* Big endian.  */
 131 #if     __BYTE_ORDER == __LITTLE_ENDIAN
 132         /* Together these comprise the mantissa.  */
 133         unsigned int mantissa3:32;
 134         unsigned int mantissa2:32;
 135         unsigned int mantissa1:32;
 136         unsigned int mantissa0:16;
 137         unsigned int exponent:15;
 138         unsigned int negative:1;
 139 #endif                          /* Little endian.  */
 140       } ieee;
 141
 142     /* This format makes it easier to see if a NaN is a signalling NaN.  */
 143     struct
 144       {
 145 #if     __BYTE_ORDER == __BIG_ENDIAN
 146         unsigned int negative:1;
 147         unsigned int exponent:15;
 148         unsigned int quiet_nan:1;
 149         /* Together these comprise the mantissa.  */
 150         unsigned int mantissa0:15;
 151         unsigned int mantissa1:32;
 152         unsigned int mantissa2:32;
 153         unsigned int mantissa3:32;
 154 #else
 155         /* Together these comprise the mantissa.  */
 156         unsigned int mantissa3:32;
 157         unsigned int mantissa2:32;
 158         unsigned int mantissa1:32;
 159         unsigned int mantissa0:15;
 160         unsigned int quiet_nan:1;
 161         unsigned int exponent:15;
 162         unsigned int negative:1;
 163 #endif
 164       } ieee_nan;
 165   };
 166
 167 #define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent.  */
 168
 169 __END_DECLS
 170
 171 #endif /* ieee754.h */