projects / thirdparty / glibc.git / blame
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| d614a753 | 1 | /* Copyright (C) 1992-2020 Free Software Foundation, Inc. |
| 79bd0564 AO |
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 | |
| ab84e3ff | 15 | License along with the GNU C Library. If not, see |
| 5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
| 79bd0564 AO |
17 | |
| 18 | #ifndef _IEEE754_H | |
| 79bd0564 | 19 | #define _IEEE754_H 1 |
| aa706e13 | 20 | |
| 79bd0564 AO |
21 | #include <features.h> |
| 22 | ||
| aa706e13 | 23 | #include <bits/endian.h> |
| 79bd0564 | 24 | |
| aa706e13 AF |
25 | #ifndef __LDBL_MANT_DIG__ |
| 26 | # include <float.h> | |
| 27 | # define __LDBL_MANT_DIG__ __LDBL_MANT_DIG__ | |
| 28 | #endif | |
| 79bd0564 AO |
29 | |
| 30 | __BEGIN_DECLS | |
| 31 | ||
| 32 | union ieee754_float | |
| 33 | { | |
| 34 | float f; | |
| 35 | ||
| 36 | /* This is the IEEE 754 single-precision format. */ | |
| 37 | struct | |
| 38 | { | |
| 39 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 40 | unsigned int negative:1; | |
| 41 | unsigned int exponent:8; | |
| 42 | unsigned int mantissa:23; | |
| 43 | #endif /* Big endian. */ | |
| 44 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 45 | unsigned int mantissa:23; | |
| 46 | unsigned int exponent:8; | |
| 47 | unsigned int negative:1; | |
| 48 | #endif /* Little endian. */ | |
| 49 | } ieee; | |
| 50 | ||
| 51 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 52 | struct | |
| 53 | { | |
| 54 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 55 | unsigned int negative:1; | |
| 56 | unsigned int exponent:8; | |
| 57 | unsigned int quiet_nan:1; | |
| 58 | unsigned int mantissa:22; | |
| 59 | #endif /* Big endian. */ | |
| 60 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 61 | unsigned int mantissa:22; | |
| 62 | unsigned int quiet_nan:1; | |
| 63 | unsigned int exponent:8; | |
| 64 | unsigned int negative:1; | |
| 65 | #endif /* Little endian. */ | |
| 66 | } ieee_nan; | |
| 67 | }; | |
| 68 | ||
| 69 | #define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ | |
| 70 | ||
| 71 | ||
| 72 | union ieee754_double | |
| 73 | { | |
| 74 | double d; | |
| 75 | ||
| 76 | /* This is the IEEE 754 double-precision format. */ | |
| 77 | struct | |
| 78 | { | |
| 79 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 80 | unsigned int negative:1; | |
| 81 | unsigned int exponent:11; | |
| 82 | /* Together these comprise the mantissa. */ | |
| 83 | unsigned int mantissa0:20; | |
| 84 | unsigned int mantissa1:32; | |
| 85 | #endif /* Big endian. */ | |
| 86 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 87 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
88 | unsigned int mantissa0:20; |
| 89 | unsigned int exponent:11; | |
| 90 | unsigned int negative:1; | |
| 91 | unsigned int mantissa1:32; | |
| 92 | # else | |
| 93 | /* Together these comprise the mantissa. */ | |
| 94 | unsigned int mantissa1:32; | |
| 95 | unsigned int mantissa0:20; | |
| 96 | unsigned int exponent:11; | |
| 97 | unsigned int negative:1; | |
| 98 | # endif | |
| 99 | #endif /* Little endian. */ | |
| 100 | } ieee; | |
| 101 | ||
| 102 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 103 | struct | |
| 104 | { | |
| 105 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 106 | unsigned int negative:1; | |
| 107 | unsigned int exponent:11; | |
| 108 | unsigned int quiet_nan:1; | |
| 109 | /* Together these comprise the mantissa. */ | |
| 110 | unsigned int mantissa0:19; | |
| 111 | unsigned int mantissa1:32; | |
| 112 | #else | |
| 2af06d0d | 113 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
114 | unsigned int mantissa0:19; |
| 115 | unsigned int quiet_nan:1; | |
| 116 | unsigned int exponent:11; | |
| 117 | unsigned int negative:1; | |
| 118 | unsigned int mantissa1:32; | |
| 119 | # else | |
| 120 | /* Together these comprise the mantissa. */ | |
| 121 | unsigned int mantissa1:32; | |
| 122 | unsigned int mantissa0:19; | |
| 123 | unsigned int quiet_nan:1; | |
| 124 | unsigned int exponent:11; | |
| 125 | unsigned int negative:1; | |
| 126 | # endif | |
| 127 | #endif | |
| 128 | } ieee_nan; | |
| 129 | }; | |
| 130 | ||
| 131 | #define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ | |
| 132 | ||
| aa706e13 | 133 | #if __LDBL_MANT_DIG__ == 113 |
| 79bd0564 AO |
134 | |
| 135 | union ieee854_long_double | |
| 136 | { | |
| 137 | long double d; | |
| 138 | ||
| 139 | /* This is the IEEE 854 quad-precision format. */ | |
| 140 | struct | |
| 141 | { | |
| 142 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 143 | unsigned int negative:1; | |
| 144 | unsigned int exponent:15; | |
| 145 | /* Together these comprise the mantissa. */ | |
| 146 | unsigned int mantissa0:16; | |
| 147 | unsigned int mantissa1:32; | |
| 148 | unsigned int mantissa2:32; | |
| 149 | unsigned int mantissa3:32; | |
| 150 | #endif /* Big endian. */ | |
| 151 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 152 | /* Together these comprise the mantissa. */ | |
| 153 | unsigned int mantissa3:32; | |
| 154 | unsigned int mantissa2:32; | |
| 155 | unsigned int mantissa1:32; | |
| 156 | unsigned int mantissa0:16; | |
| 157 | unsigned int exponent:15; | |
| 158 | unsigned int negative:1; | |
| 159 | #endif /* Little endian. */ | |
| 160 | } ieee; | |
| 161 | ||
| 162 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 163 | struct | |
| 164 | { | |
| 165 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 166 | unsigned int negative:1; | |
| 167 | unsigned int exponent:15; | |
| 168 | unsigned int quiet_nan:1; | |
| 169 | /* Together these comprise the mantissa. */ | |
| 170 | unsigned int mantissa0:15; | |
| 171 | unsigned int mantissa1:32; | |
| 172 | unsigned int mantissa2:32; | |
| 173 | unsigned int mantissa3:32; | |
| 174 | #endif /* Big endian. */ | |
| 175 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 176 | /* Together these comprise the mantissa. */ | |
| 177 | unsigned int mantissa3:32; | |
| 178 | unsigned int mantissa2:32; | |
| 179 | unsigned int mantissa1:32; | |
| 180 | unsigned int mantissa0:15; | |
| 181 | unsigned int quiet_nan:1; | |
| 182 | unsigned int exponent:15; | |
| 183 | unsigned int negative:1; | |
| 184 | #endif /* Little endian. */ | |
| 185 | } ieee_nan; | |
| 79bd0564 AO |
186 | }; |
| 187 | ||
| 188 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent. */ | |
| 189 | ||
| aa706e13 | 190 | #elif __LDBL_MANT_DIG__ == 64 |
| 79bd0564 AO |
191 | |
| 192 | union ieee854_long_double | |
| 193 | { | |
| 194 | long double d; | |
| 195 | ||
| 196 | /* This is the IEEE 854 double-extended-precision format. */ | |
| 197 | struct | |
| 198 | { | |
| 199 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 200 | unsigned int negative:1; | |
| 201 | unsigned int exponent:15; | |
| 202 | unsigned int empty:16; | |
| 203 | unsigned int mantissa0:32; | |
| 204 | unsigned int mantissa1:32; | |
| 205 | #endif | |
| 206 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 207 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
208 | unsigned int exponent:15; |
| 209 | unsigned int negative:1; | |
| 210 | unsigned int empty:16; | |
| 211 | unsigned int mantissa0:32; | |
| 212 | unsigned int mantissa1:32; | |
| 213 | # else | |
| 214 | unsigned int mantissa1:32; | |
| 215 | unsigned int mantissa0:32; | |
| 216 | unsigned int exponent:15; | |
| 217 | unsigned int negative:1; | |
| 218 | unsigned int empty:16; | |
| 219 | # endif | |
| 220 | #endif | |
| 221 | } ieee; | |
| 222 | ||
| 223 | /* This is for NaNs in the IEEE 854 double-extended-precision format. */ | |
| 224 | struct | |
| 225 | { | |
| 226 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 227 | unsigned int negative:1; | |
| 228 | unsigned int exponent:15; | |
| 229 | unsigned int empty:16; | |
| 230 | unsigned int one:1; | |
| 231 | unsigned int quiet_nan:1; | |
| 232 | unsigned int mantissa0:30; | |
| 233 | unsigned int mantissa1:32; | |
| 234 | #endif | |
| 235 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 236 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
237 | unsigned int exponent:15; |
| 238 | unsigned int negative:1; | |
| 239 | unsigned int empty:16; | |
| 240 | unsigned int mantissa0:30; | |
| 241 | unsigned int quiet_nan:1; | |
| 242 | unsigned int one:1; | |
| 243 | unsigned int mantissa1:32; | |
| 244 | # else | |
| 245 | unsigned int mantissa1:32; | |
| 246 | unsigned int mantissa0:30; | |
| 247 | unsigned int quiet_nan:1; | |
| 248 | unsigned int one:1; | |
| 249 | unsigned int exponent:15; | |
| 250 | unsigned int negative:1; | |
| 251 | unsigned int empty:16; | |
| 252 | # endif | |
| 253 | #endif | |
| 254 | } ieee_nan; | |
| 255 | }; | |
| 256 | ||
| 257 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff | |
| 258 | ||
| aa706e13 | 259 | #elif __LDBL_MANT_DIG__ == 53 |
| 79bd0564 AO |
260 | |
| 261 | union ieee854_long_double | |
| 262 | { | |
| 263 | long double d; | |
| 264 | ||
| 265 | /* This is the IEEE 754 double-precision format. */ | |
| 266 | struct | |
| 267 | { | |
| 268 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 269 | unsigned int negative:1; | |
| 270 | unsigned int exponent:11; | |
| 271 | /* Together these comprise the mantissa. */ | |
| 272 | unsigned int mantissa0:20; | |
| 273 | unsigned int mantissa1:32; | |
| 274 | #endif /* Big endian. */ | |
| 275 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 276 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
277 | unsigned int mantissa0:20; |
| 278 | unsigned int exponent:11; | |
| 279 | unsigned int negative:1; | |
| 280 | unsigned int mantissa1:32; | |
| 281 | # else | |
| 282 | /* Together these comprise the mantissa. */ | |
| 283 | unsigned int mantissa1:32; | |
| 284 | unsigned int mantissa0:20; | |
| 285 | unsigned int exponent:11; | |
| 286 | unsigned int negative:1; | |
| 287 | # endif | |
| 288 | #endif /* Little endian. */ | |
| 289 | } ieee; | |
| 290 | ||
| 291 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 292 | struct | |
| 293 | { | |
| 294 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 295 | unsigned int negative:1; | |
| 296 | unsigned int exponent:11; | |
| 297 | unsigned int quiet_nan:1; | |
| 298 | /* Together these comprise the mantissa. */ | |
| 299 | unsigned int mantissa0:19; | |
| 300 | unsigned int mantissa1:32; | |
| 301 | #else | |
| 2af06d0d | 302 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
303 | unsigned int mantissa0:19; |
| 304 | unsigned int quiet_nan:1; | |
| 305 | unsigned int exponent:11; | |
| 306 | unsigned int negative:1; | |
| 307 | unsigned int mantissa1:32; | |
| 308 | # else | |
| 309 | /* Together these comprise the mantissa. */ | |
| 310 | unsigned int mantissa1:32; | |
| 311 | unsigned int mantissa0:19; | |
| 312 | unsigned int quiet_nan:1; | |
| 313 | unsigned int exponent:11; | |
| 314 | unsigned int negative:1; | |
| 315 | # endif | |
| 316 | #endif | |
| 317 | } ieee_nan; | |
| 318 | }; | |
| 319 | ||
| 320 | #define IEEE854_LONG_DOUBLE_BIAS 0x3ff /* Added to exponent. */ | |
| 321 | ||
| aa706e13 | 322 | #endif /* __LDBL_MANT_DIG__ == 53 */ |
| 79bd0564 AO |
323 | |
| 324 | __END_DECLS | |
| 325 | ||
| 326 | #endif /* ieee754.h */ |