| 1 | /* Copyright (C) 1992, 1995, 1996, 1999 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, write to the Free |
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| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 17 | 02111-1307 USA. */ |
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| 18 | |
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| 19 | #ifndef _IEEE754_H |
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| 20 | |
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| 21 | #define _IEEE754_H 1 |
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| 22 | #include <features.h> |
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| 23 | |
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| 24 | #include <endian.h> |
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| 25 | |
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| 26 | __BEGIN_DECLS |
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| 27 | |
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| 28 | union ieee754_float |
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| 29 | { |
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| 30 | float f; |
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| 31 | |
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| 32 | /* This is the IEEE 754 single-precision format. */ |
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| 33 | struct |
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| 34 | { |
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| 35 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 36 | unsigned int negative:1; |
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| 37 | unsigned int exponent:8; |
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| 38 | unsigned int mantissa:23; |
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| 39 | #endif /* Big endian. */ |
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| 40 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
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| 41 | unsigned int mantissa:23; |
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| 42 | unsigned int exponent:8; |
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| 43 | unsigned int negative:1; |
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| 44 | #endif /* Little endian. */ |
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| 45 | } ieee; |
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| 46 | |
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| 47 | /* This format makes it easier to see if a NaN is a signalling NaN. */ |
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| 48 | struct |
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| 49 | { |
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| 50 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 51 | unsigned int negative:1; |
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| 52 | unsigned int exponent:8; |
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| 53 | unsigned int quiet_nan:1; |
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| 54 | unsigned int mantissa:22; |
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| 55 | #endif /* Big endian. */ |
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| 56 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
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| 57 | unsigned int mantissa:22; |
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| 58 | unsigned int quiet_nan:1; |
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| 59 | unsigned int exponent:8; |
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| 60 | unsigned int negative:1; |
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| 61 | #endif /* Little endian. */ |
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| 62 | } ieee_nan; |
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| 63 | }; |
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| 64 | |
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| 65 | #define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ |
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| 66 | |
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| 67 | |
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| 68 | union ieee754_double |
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| 69 | { |
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| 70 | double d; |
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| 71 | |
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| 72 | /* This is the IEEE 754 double-precision format. */ |
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| 73 | struct |
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| 74 | { |
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| 75 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 76 | unsigned int negative:1; |
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| 77 | unsigned int exponent:11; |
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| 78 | /* Together these comprise the mantissa. */ |
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| 79 | unsigned int mantissa0:20; |
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| 80 | unsigned int mantissa1:32; |
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| 81 | #endif /* Big endian. */ |
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| 82 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
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| 83 | # if __FLOAT_WORD_ORDER == BIG_ENDIAN |
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| 84 | unsigned int mantissa0:20; |
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| 85 | unsigned int exponent:11; |
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| 86 | unsigned int negative:1; |
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| 87 | unsigned int mantissa1:32; |
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| 88 | # else |
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| 89 | /* Together these comprise the mantissa. */ |
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| 90 | unsigned int mantissa1:32; |
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| 91 | unsigned int mantissa0:20; |
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| 92 | unsigned int exponent:11; |
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| 93 | unsigned int negative:1; |
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| 94 | # endif |
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| 95 | #endif /* Little endian. */ |
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| 96 | } ieee; |
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| 97 | |
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| 98 | /* This format makes it easier to see if a NaN is a signalling NaN. */ |
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| 99 | struct |
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| 100 | { |
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| 101 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 102 | unsigned int negative:1; |
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| 103 | unsigned int exponent:11; |
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| 104 | unsigned int quiet_nan:1; |
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| 105 | /* Together these comprise the mantissa. */ |
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| 106 | unsigned int mantissa0:19; |
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| 107 | unsigned int mantissa1:32; |
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| 108 | #else |
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| 109 | # if __FLOAT_WORD_ORDER == BIG_ENDIAN |
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| 110 | unsigned int mantissa0:19; |
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| 111 | unsigned int quiet_nan:1; |
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| 112 | unsigned int exponent:11; |
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| 113 | unsigned int negative:1; |
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| 114 | unsigned int mantissa1:32; |
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| 115 | # else |
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| 116 | /* Together these comprise the mantissa. */ |
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| 117 | unsigned int mantissa1:32; |
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| 118 | unsigned int mantissa0:19; |
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| 119 | unsigned int quiet_nan:1; |
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| 120 | unsigned int exponent:11; |
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| 121 | unsigned int negative:1; |
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| 122 | # endif |
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| 123 | #endif |
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| 124 | } ieee_nan; |
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| 125 | }; |
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| 126 | |
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| 127 | #define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ |
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| 128 | |
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| 129 | |
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| 130 | union ieee854_long_double |
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| 131 | { |
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| 132 | long double d; |
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| 133 | |
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| 134 | /* This is the IEEE 854 double-extended-precision format. */ |
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| 135 | struct |
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| 136 | { |
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| 137 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 138 | unsigned int negative:1; |
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| 139 | unsigned int exponent:15; |
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| 140 | unsigned int empty:16; |
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| 141 | unsigned int mantissa0:32; |
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| 142 | unsigned int mantissa1:32; |
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| 143 | #endif |
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| 144 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
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| 145 | # if __FLOAT_WORD_ORDER == BIG_ENDIAN |
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| 146 | unsigned int exponent:15; |
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| 147 | unsigned int negative:1; |
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| 148 | unsigned int empty:16; |
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| 149 | unsigned int mantissa0:32; |
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| 150 | unsigned int mantissa1:32; |
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| 151 | # else |
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| 152 | unsigned int mantissa1:32; |
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| 153 | unsigned int mantissa0:32; |
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| 154 | unsigned int exponent:15; |
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| 155 | unsigned int negative:1; |
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| 156 | unsigned int empty:16; |
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| 157 | # endif |
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| 158 | #endif |
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| 159 | } ieee; |
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| 160 | |
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| 161 | /* This is for NaNs in the IEEE 854 double-extended-precision format. */ |
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| 162 | struct |
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| 163 | { |
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| 164 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 165 | unsigned int negative:1; |
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| 166 | unsigned int exponent:15; |
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| 167 | unsigned int empty:16; |
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| 168 | unsigned int one:1; |
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| 169 | unsigned int quiet_nan:1; |
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| 170 | unsigned int mantissa0:30; |
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| 171 | unsigned int mantissa1:32; |
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| 172 | #endif |
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| 173 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
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| 174 | # if __FLOAT_WORD_ORDER == BIG_ENDIAN |
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| 175 | unsigned int exponent:15; |
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| 176 | unsigned int negative:1; |
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| 177 | unsigned int empty:16; |
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| 178 | unsigned int mantissa0:30; |
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| 179 | unsigned int quiet_nan:1; |
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| 180 | unsigned int one:1; |
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| 181 | unsigned int mantissa1:32; |
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| 182 | # else |
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| 183 | unsigned int mantissa1:32; |
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| 184 | unsigned int mantissa0:30; |
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| 185 | unsigned int quiet_nan:1; |
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| 186 | unsigned int one:1; |
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| 187 | unsigned int exponent:15; |
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| 188 | unsigned int negative:1; |
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| 189 | unsigned int empty:16; |
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| 190 | # endif |
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| 191 | #endif |
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| 192 | } ieee_nan; |
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| 193 | }; |
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| 194 | |
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| 195 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff |
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| 196 | |
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| 197 | __END_DECLS |
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| 198 | |
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| 199 | #endif /* ieee754.h */ |
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