projects / thirdparty / glibc.git / blame
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| f7a9f785 | 1 | /* Copyright (C) 1992-2016 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 PE |
15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 79bd0564 AO |
17 | |
| 18 | #ifndef _IEEE754_H | |
| 19 | ||
| 20 | #define _IEEE754_H 1 | |
| 21 | #include <features.h> | |
| 22 | ||
| 23 | #include <endian.h> | |
| 24 | ||
| 25 | #include <float.h> | |
| 26 | ||
| 27 | __BEGIN_DECLS | |
| 28 | ||
| 29 | union ieee754_float | |
| 30 | { | |
| 31 | float f; | |
| 32 | ||
| 33 | /* This is the IEEE 754 single-precision format. */ | |
| 34 | struct | |
| 35 | { | |
| 36 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 37 | unsigned int negative:1; | |
| 38 | unsigned int exponent:8; | |
| 39 | unsigned int mantissa:23; | |
| 40 | #endif /* Big endian. */ | |
| 41 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 42 | unsigned int mantissa:23; | |
| 43 | unsigned int exponent:8; | |
| 44 | unsigned int negative:1; | |
| 45 | #endif /* Little endian. */ | |
| 46 | } ieee; | |
| 47 | ||
| 48 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 49 | struct | |
| 50 | { | |
| 51 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 52 | unsigned int negative:1; | |
| 53 | unsigned int exponent:8; | |
| 54 | unsigned int quiet_nan:1; | |
| 55 | unsigned int mantissa:22; | |
| 56 | #endif /* Big endian. */ | |
| 57 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 58 | unsigned int mantissa:22; | |
| 59 | unsigned int quiet_nan:1; | |
| 60 | unsigned int exponent:8; | |
| 61 | unsigned int negative:1; | |
| 62 | #endif /* Little endian. */ | |
| 63 | } ieee_nan; | |
| 64 | }; | |
| 65 | ||
| 66 | #define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ | |
| 67 | ||
| 68 | ||
| 69 | union ieee754_double | |
| 70 | { | |
| 71 | double d; | |
| 72 | ||
| 73 | /* This is the IEEE 754 double-precision format. */ | |
| 74 | struct | |
| 75 | { | |
| 76 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 77 | unsigned int negative:1; | |
| 78 | unsigned int exponent:11; | |
| 79 | /* Together these comprise the mantissa. */ | |
| 80 | unsigned int mantissa0:20; | |
| 81 | unsigned int mantissa1:32; | |
| 82 | #endif /* Big endian. */ | |
| 83 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 84 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
85 | unsigned int mantissa0:20; |
| 86 | unsigned int exponent:11; | |
| 87 | unsigned int negative:1; | |
| 88 | unsigned int mantissa1:32; | |
| 89 | # else | |
| 90 | /* Together these comprise the mantissa. */ | |
| 91 | unsigned int mantissa1:32; | |
| 92 | unsigned int mantissa0:20; | |
| 93 | unsigned int exponent:11; | |
| 94 | unsigned int negative:1; | |
| 95 | # endif | |
| 96 | #endif /* Little endian. */ | |
| 97 | } ieee; | |
| 98 | ||
| 99 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 100 | struct | |
| 101 | { | |
| 102 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 103 | unsigned int negative:1; | |
| 104 | unsigned int exponent:11; | |
| 105 | unsigned int quiet_nan:1; | |
| 106 | /* Together these comprise the mantissa. */ | |
| 107 | unsigned int mantissa0:19; | |
| 108 | unsigned int mantissa1:32; | |
| 109 | #else | |
| 2af06d0d | 110 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
111 | unsigned int mantissa0:19; |
| 112 | unsigned int quiet_nan:1; | |
| 113 | unsigned int exponent:11; | |
| 114 | unsigned int negative:1; | |
| 115 | unsigned int mantissa1:32; | |
| 116 | # else | |
| 117 | /* Together these comprise the mantissa. */ | |
| 118 | unsigned int mantissa1:32; | |
| 119 | unsigned int mantissa0:19; | |
| 120 | unsigned int quiet_nan:1; | |
| 121 | unsigned int exponent:11; | |
| 122 | unsigned int negative:1; | |
| 123 | # endif | |
| 124 | #endif | |
| 125 | } ieee_nan; | |
| 126 | }; | |
| 127 | ||
| 128 | #define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ | |
| 129 | ||
| 130 | #if LDBL_MANT_DIG == 113 | |
| 131 | ||
| 132 | union ieee854_long_double | |
| 133 | { | |
| 134 | long double d; | |
| 135 | ||
| 136 | /* This is the IEEE 854 quad-precision format. */ | |
| 137 | struct | |
| 138 | { | |
| 139 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 140 | unsigned int negative:1; | |
| 141 | unsigned int exponent:15; | |
| 142 | /* Together these comprise the mantissa. */ | |
| 143 | unsigned int mantissa0:16; | |
| 144 | unsigned int mantissa1:32; | |
| 145 | unsigned int mantissa2:32; | |
| 146 | unsigned int mantissa3:32; | |
| 147 | #endif /* Big endian. */ | |
| 148 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 149 | /* Together these comprise the mantissa. */ | |
| 150 | unsigned int mantissa3:32; | |
| 151 | unsigned int mantissa2:32; | |
| 152 | unsigned int mantissa1:32; | |
| 153 | unsigned int mantissa0:16; | |
| 154 | unsigned int exponent:15; | |
| 155 | unsigned int negative:1; | |
| 156 | #endif /* Little endian. */ | |
| 157 | } ieee; | |
| 158 | ||
| 159 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 160 | struct | |
| 161 | { | |
| 162 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 163 | unsigned int negative:1; | |
| 164 | unsigned int exponent:15; | |
| 165 | unsigned int quiet_nan:1; | |
| 166 | /* Together these comprise the mantissa. */ | |
| 167 | unsigned int mantissa0:15; | |
| 168 | unsigned int mantissa1:32; | |
| 169 | unsigned int mantissa2:32; | |
| 170 | unsigned int mantissa3:32; | |
| 171 | #endif /* Big endian. */ | |
| 172 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 173 | /* Together these comprise the mantissa. */ | |
| 174 | unsigned int mantissa3:32; | |
| 175 | unsigned int mantissa2:32; | |
| 176 | unsigned int mantissa1:32; | |
| 177 | unsigned int mantissa0:15; | |
| 178 | unsigned int quiet_nan:1; | |
| 179 | unsigned int exponent:15; | |
| 180 | unsigned int negative:1; | |
| 181 | #endif /* Little endian. */ | |
| 182 | } ieee_nan; | |
| 79bd0564 AO |
183 | }; |
| 184 | ||
| 185 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent. */ | |
| 186 | ||
| 187 | #elif LDBL_MANT_DIG == 64 | |
| 188 | ||
| 189 | union ieee854_long_double | |
| 190 | { | |
| 191 | long double d; | |
| 192 | ||
| 193 | /* This is the IEEE 854 double-extended-precision format. */ | |
| 194 | struct | |
| 195 | { | |
| 196 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 197 | unsigned int negative:1; | |
| 198 | unsigned int exponent:15; | |
| 199 | unsigned int empty:16; | |
| 200 | unsigned int mantissa0:32; | |
| 201 | unsigned int mantissa1:32; | |
| 202 | #endif | |
| 203 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 204 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
205 | unsigned int exponent:15; |
| 206 | unsigned int negative:1; | |
| 207 | unsigned int empty:16; | |
| 208 | unsigned int mantissa0:32; | |
| 209 | unsigned int mantissa1:32; | |
| 210 | # else | |
| 211 | unsigned int mantissa1:32; | |
| 212 | unsigned int mantissa0:32; | |
| 213 | unsigned int exponent:15; | |
| 214 | unsigned int negative:1; | |
| 215 | unsigned int empty:16; | |
| 216 | # endif | |
| 217 | #endif | |
| 218 | } ieee; | |
| 219 | ||
| 220 | /* This is for NaNs in the IEEE 854 double-extended-precision format. */ | |
| 221 | struct | |
| 222 | { | |
| 223 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 224 | unsigned int negative:1; | |
| 225 | unsigned int exponent:15; | |
| 226 | unsigned int empty:16; | |
| 227 | unsigned int one:1; | |
| 228 | unsigned int quiet_nan:1; | |
| 229 | unsigned int mantissa0:30; | |
| 230 | unsigned int mantissa1:32; | |
| 231 | #endif | |
| 232 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 233 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
234 | unsigned int exponent:15; |
| 235 | unsigned int negative:1; | |
| 236 | unsigned int empty:16; | |
| 237 | unsigned int mantissa0:30; | |
| 238 | unsigned int quiet_nan:1; | |
| 239 | unsigned int one:1; | |
| 240 | unsigned int mantissa1:32; | |
| 241 | # else | |
| 242 | unsigned int mantissa1:32; | |
| 243 | unsigned int mantissa0:30; | |
| 244 | unsigned int quiet_nan:1; | |
| 245 | unsigned int one:1; | |
| 246 | unsigned int exponent:15; | |
| 247 | unsigned int negative:1; | |
| 248 | unsigned int empty:16; | |
| 249 | # endif | |
| 250 | #endif | |
| 251 | } ieee_nan; | |
| 252 | }; | |
| 253 | ||
| 254 | #define IEEE854_LONG_DOUBLE_BIAS 0x3fff | |
| 255 | ||
| 256 | #elif LDBL_MANT_DIG == 53 | |
| 257 | ||
| 258 | union ieee854_long_double | |
| 259 | { | |
| 260 | long double d; | |
| 261 | ||
| 262 | /* This is the IEEE 754 double-precision format. */ | |
| 263 | struct | |
| 264 | { | |
| 265 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 266 | unsigned int negative:1; | |
| 267 | unsigned int exponent:11; | |
| 268 | /* Together these comprise the mantissa. */ | |
| 269 | unsigned int mantissa0:20; | |
| 270 | unsigned int mantissa1:32; | |
| 271 | #endif /* Big endian. */ | |
| 272 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 2af06d0d | 273 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
274 | unsigned int mantissa0:20; |
| 275 | unsigned int exponent:11; | |
| 276 | unsigned int negative:1; | |
| 277 | unsigned int mantissa1:32; | |
| 278 | # else | |
| 279 | /* Together these comprise the mantissa. */ | |
| 280 | unsigned int mantissa1:32; | |
| 281 | unsigned int mantissa0:20; | |
| 282 | unsigned int exponent:11; | |
| 283 | unsigned int negative:1; | |
| 284 | # endif | |
| 285 | #endif /* Little endian. */ | |
| 286 | } ieee; | |
| 287 | ||
| 288 | /* This format makes it easier to see if a NaN is a signalling NaN. */ | |
| 289 | struct | |
| 290 | { | |
| 291 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 292 | unsigned int negative:1; | |
| 293 | unsigned int exponent:11; | |
| 294 | unsigned int quiet_nan:1; | |
| 295 | /* Together these comprise the mantissa. */ | |
| 296 | unsigned int mantissa0:19; | |
| 297 | unsigned int mantissa1:32; | |
| 298 | #else | |
| 2af06d0d | 299 | # if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 79bd0564 AO |
300 | unsigned int mantissa0:19; |
| 301 | unsigned int quiet_nan:1; | |
| 302 | unsigned int exponent:11; | |
| 303 | unsigned int negative:1; | |
| 304 | unsigned int mantissa1:32; | |
| 305 | # else | |
| 306 | /* Together these comprise the mantissa. */ | |
| 307 | unsigned int mantissa1:32; | |
| 308 | unsigned int mantissa0:19; | |
| 309 | unsigned int quiet_nan:1; | |
| 310 | unsigned int exponent:11; | |
| 311 | unsigned int negative:1; | |
| 312 | # endif | |
| 313 | #endif | |
| 314 | } ieee_nan; | |
| 315 | }; | |
| 316 | ||
| 317 | #define IEEE854_LONG_DOUBLE_BIAS 0x3ff /* Added to exponent. */ | |
| 318 | ||
| 319 | #endif /* LDBL_MANT_DIG == 53 */ | |
| 320 | ||
| 321 | __END_DECLS | |
| 322 | ||
| 323 | #endif /* ieee754.h */ |