1 /* Copyright (C) 2002, 2007, 2008, 2009, 2010, 2011 2 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* 26 * ISO C Standard: 5.2.4.2.2 Characteristics of floating types <float.h> 27 */ 28 29 #ifndef _FLOAT_H___ 30 #define _FLOAT_H___ 31 32 /* Radix of exponent representation, b. */ 33 #undef FLT_RADIX 34 #define FLT_RADIX __FLT_RADIX__ 35 36 /* Number of base-FLT_RADIX digits in the significand, p. */ 37 #undef FLT_MANT_DIG 38 #undef DBL_MANT_DIG 39 #undef LDBL_MANT_DIG 40 #define FLT_MANT_DIG __FLT_MANT_DIG__ 41 #define DBL_MANT_DIG __DBL_MANT_DIG__ 42 #define LDBL_MANT_DIG __LDBL_MANT_DIG__ 43 44 /* Number of decimal digits, q, such that any floating-point number with q 45 decimal digits can be rounded into a floating-point number with p radix b 46 digits and back again without change to the q decimal digits, 47 48 p * log10(b) if b is a power of 10 49 floor((p - 1) * log10(b)) otherwise 50 */ 51 #undef FLT_DIG 52 #undef DBL_DIG 53 #undef LDBL_DIG 54 #define FLT_DIG __FLT_DIG__ 55 #define DBL_DIG __DBL_DIG__ 56 #define LDBL_DIG __LDBL_DIG__ 57 58 /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */ 59 #undef FLT_MIN_EXP 60 #undef DBL_MIN_EXP 61 #undef LDBL_MIN_EXP 62 #define FLT_MIN_EXP __FLT_MIN_EXP__ 63 #define DBL_MIN_EXP __DBL_MIN_EXP__ 64 #define LDBL_MIN_EXP __LDBL_MIN_EXP__ 65 66 /* Minimum negative integer such that 10 raised to that power is in the 67 range of normalized floating-point numbers, 68 69 ceil(log10(b) * (emin - 1)) 70 */ 71 #undef FLT_MIN_10_EXP 72 #undef DBL_MIN_10_EXP 73 #undef LDBL_MIN_10_EXP 74 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__ 75 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__ 76 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__ 77 78 /* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax. */ 79 #undef FLT_MAX_EXP 80 #undef DBL_MAX_EXP 81 #undef LDBL_MAX_EXP 82 #define FLT_MAX_EXP __FLT_MAX_EXP__ 83 #define DBL_MAX_EXP __DBL_MAX_EXP__ 84 #define LDBL_MAX_EXP __LDBL_MAX_EXP__ 85 86 /* Maximum integer such that 10 raised to that power is in the range of 87 representable finite floating-point numbers, 88 89 floor(log10((1 - b**-p) * b**emax)) 90 */ 91 #undef FLT_MAX_10_EXP 92 #undef DBL_MAX_10_EXP 93 #undef LDBL_MAX_10_EXP 94 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__ 95 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__ 96 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__ 97 98 /* Maximum representable finite floating-point number, 99 100 (1 - b**-p) * b**emax 101 */ 102 #undef FLT_MAX 103 #undef DBL_MAX 104 #undef LDBL_MAX 105 #define FLT_MAX __FLT_MAX__ 106 #define DBL_MAX __DBL_MAX__ 107 #define LDBL_MAX __LDBL_MAX__ 108 109 /* The difference between 1 and the least value greater than 1 that is 110 representable in the given floating point type, b**1-p. */ 111 #undef FLT_EPSILON 112 #undef DBL_EPSILON 113 #undef LDBL_EPSILON 114 #define FLT_EPSILON __FLT_EPSILON__ 115 #define DBL_EPSILON __DBL_EPSILON__ 116 #define LDBL_EPSILON __LDBL_EPSILON__ 117 118 /* Minimum normalized positive floating-point number, b**(emin - 1). */ 119 #undef FLT_MIN 120 #undef DBL_MIN 121 #undef LDBL_MIN 122 #define FLT_MIN __FLT_MIN__ 123 #define DBL_MIN __DBL_MIN__ 124 #define LDBL_MIN __LDBL_MIN__ 125 126 /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */ 127 /* ??? This is supposed to change with calls to fesetround in <fenv.h>. */ 128 #undef FLT_ROUNDS 129 #define FLT_ROUNDS 1 130 131 #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 132 /* The floating-point expression evaluation method. 133 -1 indeterminate 134 0 evaluate all operations and constants just to the range and 135 precision of the type 136 1 evaluate operations and constants of type float and double 137 to the range and precision of the double type, evaluate 138 long double operations and constants to the range and 139 precision of the long double type 140 2 evaluate all operations and constants to the range and 141 precision of the long double type 142 143 ??? This ought to change with the setting of the fp control word; 144 the value provided by the compiler assumes the widest setting. */ 145 #undef FLT_EVAL_METHOD 146 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__ 147 148 /* Number of decimal digits, n, such that any floating-point number in the 149 widest supported floating type with pmax radix b digits can be rounded 150 to a floating-point number with n decimal digits and back again without 151 change to the value, 152 153 pmax * log10(b) if b is a power of 10 154 ceil(1 + pmax * log10(b)) otherwise 155 */ 156 #undef DECIMAL_DIG 157 #define DECIMAL_DIG __DECIMAL_DIG__ 158 159 #endif /* C99 */ 160 161 #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 162 /* Versions of DECIMAL_DIG for each floating-point type. */ 163 #undef FLT_DECIMAL_DIG 164 #undef DBL_DECIMAL_DIG 165 #undef LDBL_DECIMAL_DIG 166 #define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__ 167 #define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__ 168 #define LDBL_DECIMAL_DIG __DECIMAL_DIG__ 169 170 /* Whether types support subnormal numbers. */ 171 #undef FLT_HAS_SUBNORM 172 #undef DBL_HAS_SUBNORM 173 #undef LDBL_HAS_SUBNORM 174 #define FLT_HAS_SUBNORM __FLT_HAS_DENORM__ 175 #define DBL_HAS_SUBNORM __DBL_HAS_DENORM__ 176 #define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__ 177 178 /* Minimum positive values, including subnormals. */ 179 #undef FLT_TRUE_MIN 180 #undef DBL_TRUE_MIN 181 #undef LDBL_TRUE_MIN 182 #if __FLT_HAS_DENORM__ 183 #define FLT_TRUE_MIN __FLT_DENORM_MIN__ 184 #else 185 #define FLT_TRUE_MIN __FLT_MIN__ 186 #endif 187 #if __DBL_HAS_DENORM__ 188 #define DBL_TRUE_MIN __DBL_DENORM_MIN__ 189 #else 190 #define DBL_TRUE_MIN __DBL_MIN__ 191 #endif 192 #if __LDBL_HAS_DENORM__ 193 #define LDBL_TRUE_MIN __LDBL_DENORM_MIN__ 194 #else 195 #define LDBL_TRUE_MIN __LDBL_MIN__ 196 #endif 197 198 #endif /* C11 */ 199 200 #ifdef __STDC_WANT_DEC_FP__ 201 /* Draft Technical Report 24732, extension for decimal floating-point 202 arithmetic: Characteristic of decimal floating types <float.h>. */ 203 204 /* Number of base-FLT_RADIX digits in the significand, p. */ 205 #undef DEC32_MANT_DIG 206 #undef DEC64_MANT_DIG 207 #undef DEC128_MANT_DIG 208 #define DEC32_MANT_DIG __DEC32_MANT_DIG__ 209 #define DEC64_MANT_DIG __DEC64_MANT_DIG__ 210 #define DEC128_MANT_DIG __DEC128_MANT_DIG__ 211 212 /* Minimum exponent. */ 213 #undef DEC32_MIN_EXP 214 #undef DEC64_MIN_EXP 215 #undef DEC128_MIN_EXP 216 #define DEC32_MIN_EXP __DEC32_MIN_EXP__ 217 #define DEC64_MIN_EXP __DEC64_MIN_EXP__ 218 #define DEC128_MIN_EXP __DEC128_MIN_EXP__ 219 220 /* Maximum exponent. */ 221 #undef DEC32_MAX_EXP 222 #undef DEC64_MAX_EXP 223 #undef DEC128_MAX_EXP 224 #define DEC32_MAX_EXP __DEC32_MAX_EXP__ 225 #define DEC64_MAX_EXP __DEC64_MAX_EXP__ 226 #define DEC128_MAX_EXP __DEC128_MAX_EXP__ 227 228 /* Maximum representable finite decimal floating-point number 229 (there are 6, 15, and 33 9s after the decimal points respectively). */ 230 #undef DEC32_MAX 231 #undef DEC64_MAX 232 #undef DEC128_MAX 233 #define DEC32_MAX __DEC32_MAX__ 234 #define DEC64_MAX __DEC64_MAX__ 235 #define DEC128_MAX __DEC128_MAX__ 236 237 /* The difference between 1 and the least value greater than 1 that is 238 representable in the given floating point type. */ 239 #undef DEC32_EPSILON 240 #undef DEC64_EPSILON 241 #undef DEC128_EPSILON 242 #define DEC32_EPSILON __DEC32_EPSILON__ 243 #define DEC64_EPSILON __DEC64_EPSILON__ 244 #define DEC128_EPSILON __DEC128_EPSILON__ 245 246 /* Minimum normalized positive floating-point number. */ 247 #undef DEC32_MIN 248 #undef DEC64_MIN 249 #undef DEC128_MIN 250 #define DEC32_MIN __DEC32_MIN__ 251 #define DEC64_MIN __DEC64_MIN__ 252 #define DEC128_MIN __DEC128_MIN__ 253 254 /* Minimum subnormal positive floating-point number. */ 255 #undef DEC32_SUBNORMAL_MIN 256 #undef DEC64_SUBNORMAL_MIN 257 #undef DEC128_SUBNORMAL_MIN 258 #define DEC32_SUBNORMAL_MIN __DEC32_SUBNORMAL_MIN__ 259 #define DEC64_SUBNORMAL_MIN __DEC64_SUBNORMAL_MIN__ 260 #define DEC128_SUBNORMAL_MIN __DEC128_SUBNORMAL_MIN__ 261 262 /* The floating-point expression evaluation method. 263 -1 indeterminate 264 0 evaluate all operations and constants just to the range and 265 precision of the type 266 1 evaluate operations and constants of type _Decimal32 267 and _Decimal64 to the range and precision of the _Decimal64 268 type, evaluate _Decimal128 operations and constants to the 269 range and precision of the _Decimal128 type; 270 2 evaluate all operations and constants to the range and 271 precision of the _Decimal128 type. */ 272 273 #undef DEC_EVAL_METHOD 274 #define DEC_EVAL_METHOD __DEC_EVAL_METHOD__ 275 276 #endif /* __STDC_WANT_DEC_FP__ */ 277 278 #endif /* _FLOAT_H___ */ 279
