1 /* Copyright (C) 2002, 2007 Free Software Foundation, Inc. 2 3 This file is part of GCC. 4 5 GCC is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 GCC is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with GCC; see the file COPYING. If not, write to 17 the Free Software Foundation, 51 Franklin Street, Fifth Floor, 18 Boston, MA 02110-1301, USA. */ 19 20 /* As a special exception, if you include this header file into source 21 files compiled by GCC, this header file does not by itself cause 22 the resulting executable to be covered by the GNU General Public 23 License. This exception does not however invalidate any other 24 reasons why the executable file might be covered by the GNU General 25 Public License. */ 26 27 /* 28 * ISO C Standard: 5.2.4.2.2 Characteristics of floating types <float.h> 29 */ 30 31 #ifndef _FLOAT_H___ 32 #define _FLOAT_H___ 33 34 /* Radix of exponent representation, b. */ 35 #undef FLT_RADIX 36 #define FLT_RADIX __FLT_RADIX__ 37 38 /* Number of base-FLT_RADIX digits in the significand, p. */ 39 #undef FLT_MANT_DIG 40 #undef DBL_MANT_DIG 41 #undef LDBL_MANT_DIG 42 #define FLT_MANT_DIG __FLT_MANT_DIG__ 43 #define DBL_MANT_DIG __DBL_MANT_DIG__ 44 #define LDBL_MANT_DIG __LDBL_MANT_DIG__ 45 46 /* Number of decimal digits, q, such that any floating-point number with q 47 decimal digits can be rounded into a floating-point number with p radix b 48 digits and back again without change to the q decimal digits, 49 50 p * log10(b) if b is a power of 10 51 floor((p - 1) * log10(b)) otherwise 52 */ 53 #undef FLT_DIG 54 #undef DBL_DIG 55 #undef LDBL_DIG 56 #define FLT_DIG __FLT_DIG__ 57 #define DBL_DIG __DBL_DIG__ 58 #define LDBL_DIG __LDBL_DIG__ 59 60 /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */ 61 #undef FLT_MIN_EXP 62 #undef DBL_MIN_EXP 63 #undef LDBL_MIN_EXP 64 #define FLT_MIN_EXP __FLT_MIN_EXP__ 65 #define DBL_MIN_EXP __DBL_MIN_EXP__ 66 #define LDBL_MIN_EXP __LDBL_MIN_EXP__ 67 68 /* Minimum negative integer such that 10 raised to that power is in the 69 range of normalized floating-point numbers, 70 71 ceil(log10(b) * (emin - 1)) 72 */ 73 #undef FLT_MIN_10_EXP 74 #undef DBL_MIN_10_EXP 75 #undef LDBL_MIN_10_EXP 76 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__ 77 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__ 78 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__ 79 80 /* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax. */ 81 #undef FLT_MAX_EXP 82 #undef DBL_MAX_EXP 83 #undef LDBL_MAX_EXP 84 #define FLT_MAX_EXP __FLT_MAX_EXP__ 85 #define DBL_MAX_EXP __DBL_MAX_EXP__ 86 #define LDBL_MAX_EXP __LDBL_MAX_EXP__ 87 88 /* Maximum integer such that 10 raised to that power is in the range of 89 representable finite floating-point numbers, 90 91 floor(log10((1 - b**-p) * b**emax)) 92 */ 93 #undef FLT_MAX_10_EXP 94 #undef DBL_MAX_10_EXP 95 #undef LDBL_MAX_10_EXP 96 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__ 97 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__ 98 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__ 99 100 /* Maximum representable finite floating-point number, 101 102 (1 - b**-p) * b**emax 103 */ 104 #undef FLT_MAX 105 #undef DBL_MAX 106 #undef LDBL_MAX 107 #define FLT_MAX __FLT_MAX__ 108 #define DBL_MAX __DBL_MAX__ 109 #define LDBL_MAX __LDBL_MAX__ 110 111 /* The difference between 1 and the least value greater than 1 that is 112 representable in the given floating point type, b**1-p. */ 113 #undef FLT_EPSILON 114 #undef DBL_EPSILON 115 #undef LDBL_EPSILON 116 #define FLT_EPSILON __FLT_EPSILON__ 117 #define DBL_EPSILON __DBL_EPSILON__ 118 #define LDBL_EPSILON __LDBL_EPSILON__ 119 120 /* Minimum normalized positive floating-point number, b**(emin - 1). */ 121 #undef FLT_MIN 122 #undef DBL_MIN 123 #undef LDBL_MIN 124 #define FLT_MIN __FLT_MIN__ 125 #define DBL_MIN __DBL_MIN__ 126 #define LDBL_MIN __LDBL_MIN__ 127 128 /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */ 129 /* ??? This is supposed to change with calls to fesetround in <fenv.h>. */ 130 #undef FLT_ROUNDS 131 #define FLT_ROUNDS 1 132 133 #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 134 /* The floating-point expression evaluation method. 135 -1 indeterminate 136 0 evaluate all operations and constants just to the range and 137 precision of the type 138 1 evaluate operations and constants of type float and double 139 to the range and precision of the double type, evaluate 140 long double operations and constants to the range and 141 precision of the long double type 142 2 evaluate all operations and constants to the range and 143 precision of the long double type 144 145 ??? This ought to change with the setting of the fp control word; 146 the value provided by the compiler assumes the widest setting. */ 147 #undef FLT_EVAL_METHOD 148 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__ 149 150 /* Number of decimal digits, n, such that any floating-point number in the 151 widest supported floating type with pmax radix b digits can be rounded 152 to a floating-point number with n decimal digits and back again without 153 change to the value, 154 155 pmax * log10(b) if b is a power of 10 156 ceil(1 + pmax * log10(b)) otherwise 157 */ 158 #undef DECIMAL_DIG 159 #define DECIMAL_DIG __DECIMAL_DIG__ 160 161 #endif /* C99 */ 162 163 #ifdef __STDC_WANT_DEC_FP__ 164 /* Draft Technical Report 24732, extension for decimal floating-point 165 arithmetic: Characteristic of decimal floating types <float.h>. */ 166 167 /* Number of base-FLT_RADIX digits in the significand, p. */ 168 #undef DEC32_MANT_DIG 169 #undef DEC64_MANT_DIG 170 #undef DEC128_MANT_DIG 171 #define DEC32_MANT_DIG __DEC32_MANT_DIG__ 172 #define DEC64_MANT_DIG __DEC64_MANT_DIG__ 173 #define DEC128_MANT_DIG __DEC128_MANT_DIG__ 174 175 /* Minimum exponent. */ 176 #undef DEC32_MIN_EXP 177 #undef DEC64_MIN_EXP 178 #undef DEC128_MIN_EXP 179 #define DEC32_MIN_EXP __DEC32_MIN_EXP__ 180 #define DEC64_MIN_EXP __DEC64_MIN_EXP__ 181 #define DEC128_MIN_EXP __DEC128_MIN_EXP__ 182 183 /* Maximum exponent. */ 184 #undef DEC32_MAX_EXP 185 #undef DEC64_MAX_EXP 186 #undef DEC128_MAX_EXP 187 #define DEC32_MAX_EXP __DEC32_MAX_EXP__ 188 #define DEC64_MAX_EXP __DEC64_MAX_EXP__ 189 #define DEC128_MAX_EXP __DEC128_MAX_EXP__ 190 191 /* Maximum representable finite decimal floating-point number 192 (there are 6, 15, and 33 9s after the decimal points respectively). */ 193 #undef DEC32_MAX 194 #undef DEC64_MAX 195 #undef DEC128_MAX 196 #define DEC32_MAX __DEC32_MAX__ 197 #define DEC64_MAX __DEC64_MAX__ 198 #define DEC128_MAX __DEC128_MAX__ 199 200 /* The difference between 1 and the least value greater than 1 that is 201 representable in the given floating point type. */ 202 #undef DEC32_EPSILON 203 #undef DEC64_EPSILON 204 #undef DEC128_EPSILON 205 #define DEC32_EPSILON __DEC32_EPSILON__ 206 #define DEC64_EPSILON __DEC64_EPSILON__ 207 #define DEC128_EPSILON __DEC128_EPSILON__ 208 209 /* Minimum normalized positive floating-point number. */ 210 #undef DEC32_MIN 211 #undef DEC64_MIN 212 #undef DEC128_MIN 213 #define DEC32_MIN __DEC32_MIN__ 214 #define DEC64_MIN __DEC64_MIN__ 215 #define DEC128_MIN __DEC128_MIN__ 216 217 /* Minimum denormalized positive floating-point number. */ 218 #undef DEC32_DEN 219 #undef DEC64_DEN 220 #undef DEC128_DEN 221 #define DEC32_DEN __DEC32_DEN__ 222 #define DEC64_DEN __DEC64_DEN__ 223 #define DEC128_DEN __DEC128_DEN__ 224 225 /* The floating-point expression evaluation method. 226 -1 indeterminate 227 0 evaluate all operations and constants just to the range and 228 precision of the type 229 1 evaluate operations and constants of type _Decimal32 230 and _Decimal64 to the range and precision of the _Decimal64 231 type, evaluate _Decimal128 operations and constants to the 232 range and precision of the _Decimal128 type; 233 2 evaluate all operations and constants to the range and 234 precision of the _Decimal128 type. */ 235 236 #undef DECFLT_EVAL_METHOD 237 #define DECFLT_EVAL_METHOD __DECFLT_EVAL_METHOD__ 238 239 #endif /* __STDC_WANT_DEC_FP__ */ 240 241 #endif /* _FLOAT_H___ */ 242