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