| 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
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| 2 |
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| 3 | This file is part of GCC.
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| 4 |
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| 5 | GCC is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | GCC is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | Under Section 7 of GPL version 3, you are granted additional
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| 16 | permissions described in the GCC Runtime Library Exception, version
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| 17 | 3.1, as published by the Free Software Foundation.
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| 18 |
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| 19 | You should have received a copy of the GNU General Public License and
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| 20 | a copy of the GCC Runtime Library Exception along with this program;
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| 21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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| 22 | <http://www.gnu.org/licenses/>. */
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| 23 |
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| 24 | /*
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| 25 | * ISO C Standard: 5.2.4.2.2 Characteristics of floating types <float.h>
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| 26 | */
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| 27 |
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| 28 | #ifndef _FLOAT_H___
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| 29 | #define _FLOAT_H___
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| 30 |
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| 31 | /* Radix of exponent representation, b. */
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| 32 | #undef FLT_RADIX
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| 33 | #define FLT_RADIX __FLT_RADIX__
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| 34 |
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| 35 | /* Number of base-FLT_RADIX digits in the significand, p. */
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| 36 | #undef FLT_MANT_DIG
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| 37 | #undef DBL_MANT_DIG
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| 38 | #undef LDBL_MANT_DIG
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| 39 | #define FLT_MANT_DIG __FLT_MANT_DIG__
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| 40 | #define DBL_MANT_DIG __DBL_MANT_DIG__
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| 41 | #define LDBL_MANT_DIG __LDBL_MANT_DIG__
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| 42 |
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| 43 | /* Number of decimal digits, q, such that any floating-point number with q
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| 44 | decimal digits can be rounded into a floating-point number with p radix b
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| 45 | digits and back again without change to the q decimal digits,
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| 46 |
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| 47 | p * log10(b) if b is a power of 10
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| 48 | floor((p - 1) * log10(b)) otherwise
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| 49 | */
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| 50 | #undef FLT_DIG
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| 51 | #undef DBL_DIG
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| 52 | #undef LDBL_DIG
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| 53 | #define FLT_DIG __FLT_DIG__
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| 54 | #define DBL_DIG __DBL_DIG__
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| 55 | #define LDBL_DIG __LDBL_DIG__
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| 56 |
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| 57 | /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */
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| 58 | #undef FLT_MIN_EXP
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| 59 | #undef DBL_MIN_EXP
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| 60 | #undef LDBL_MIN_EXP
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| 61 | #define FLT_MIN_EXP __FLT_MIN_EXP__
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| 62 | #define DBL_MIN_EXP __DBL_MIN_EXP__
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| 63 | #define LDBL_MIN_EXP __LDBL_MIN_EXP__
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| 64 |
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| 65 | /* Minimum negative integer such that 10 raised to that power is in the
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| 66 | range of normalized floating-point numbers,
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| 67 |
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| 68 | ceil(log10(b) * (emin - 1))
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| 69 | */
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| 70 | #undef FLT_MIN_10_EXP
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| 71 | #undef DBL_MIN_10_EXP
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| 72 | #undef LDBL_MIN_10_EXP
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| 73 | #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
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| 74 | #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
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| 75 | #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
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| 76 |
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| 77 | /* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax. */
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| 78 | #undef FLT_MAX_EXP
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| 79 | #undef DBL_MAX_EXP
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| 80 | #undef LDBL_MAX_EXP
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| 81 | #define FLT_MAX_EXP __FLT_MAX_EXP__
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| 82 | #define DBL_MAX_EXP __DBL_MAX_EXP__
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| 83 | #define LDBL_MAX_EXP __LDBL_MAX_EXP__
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| 84 |
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| 85 | /* Maximum integer such that 10 raised to that power is in the range of
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| 86 | representable finite floating-point numbers,
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| 87 |
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| 88 | floor(log10((1 - b**-p) * b**emax))
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| 89 | */
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| 90 | #undef FLT_MAX_10_EXP
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| 91 | #undef DBL_MAX_10_EXP
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| 92 | #undef LDBL_MAX_10_EXP
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| 93 | #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
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| 94 | #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
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| 95 | #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
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| 96 |
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| 97 | /* Maximum representable finite floating-point number,
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| 98 |
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| 99 | (1 - b**-p) * b**emax
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| 100 | */
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| 101 | #undef FLT_MAX
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| 102 | #undef DBL_MAX
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| 103 | #undef LDBL_MAX
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| 104 | #define FLT_MAX __FLT_MAX__
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| 105 | #define DBL_MAX __DBL_MAX__
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| 106 | #define LDBL_MAX __LDBL_MAX__
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| 107 |
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| 108 | /* The difference between 1 and the least value greater than 1 that is
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| 109 | representable in the given floating point type, b**1-p. */
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| 110 | #undef FLT_EPSILON
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| 111 | #undef DBL_EPSILON
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| 112 | #undef LDBL_EPSILON
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| 113 | #define FLT_EPSILON __FLT_EPSILON__
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| 114 | #define DBL_EPSILON __DBL_EPSILON__
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| 115 | #define LDBL_EPSILON __LDBL_EPSILON__
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| 116 |
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| 117 | /* Minimum normalized positive floating-point number, b**(emin - 1). */
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| 118 | #undef FLT_MIN
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| 119 | #undef DBL_MIN
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| 120 | #undef LDBL_MIN
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| 121 | #define FLT_MIN __FLT_MIN__
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| 122 | #define DBL_MIN __DBL_MIN__
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| 123 | #define LDBL_MIN __LDBL_MIN__
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| 124 |
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| 125 | /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */
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| 126 | /* ??? This is supposed to change with calls to fesetround in <fenv.h>. */
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| 127 | #undef FLT_ROUNDS
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| 128 | #define FLT_ROUNDS 1
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| 129 |
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| 130 | #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
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| 131 | /* The floating-point expression evaluation method.
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| 132 | -1 indeterminate
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| 133 | 0 evaluate all operations and constants just to the range and
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| 134 | precision of the type
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| 135 | 1 evaluate operations and constants of type float and double
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| 136 | to the range and precision of the double type, evaluate
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| 137 | long double operations and constants to the range and
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| 138 | precision of the long double type
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| 139 | 2 evaluate all operations and constants to the range and
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| 140 | precision of the long double type
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| 141 |
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| 142 | ??? This ought to change with the setting of the fp control word;
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| 143 | the value provided by the compiler assumes the widest setting. */
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| 144 | #undef FLT_EVAL_METHOD
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| 145 | #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
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| 146 |
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| 147 | /* Number of decimal digits, n, such that any floating-point number in the
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| 148 | widest supported floating type with pmax radix b digits can be rounded
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| 149 | to a floating-point number with n decimal digits and back again without
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| 150 | change to the value,
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| 151 |
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| 152 | pmax * log10(b) if b is a power of 10
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| 153 | ceil(1 + pmax * log10(b)) otherwise
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| 154 | */
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| 155 | #undef DECIMAL_DIG
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| 156 | #define DECIMAL_DIG __DECIMAL_DIG__
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| 157 |
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| 158 | #endif /* C99 */
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| 159 |
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| 160 | #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
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| 161 | /* Versions of DECIMAL_DIG for each floating-point type. */
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| 162 | #undef FLT_DECIMAL_DIG
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| 163 | #undef DBL_DECIMAL_DIG
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| 164 | #undef LDBL_DECIMAL_DIG
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| 165 | #define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
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| 166 | #define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
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| 167 | #define LDBL_DECIMAL_DIG __DECIMAL_DIG__
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| 168 |
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| 169 | /* Whether types support subnormal numbers. */
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| 170 | #undef FLT_HAS_SUBNORM
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| 171 | #undef DBL_HAS_SUBNORM
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| 172 | #undef LDBL_HAS_SUBNORM
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| 173 | #define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
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| 174 | #define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
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| 175 | #define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
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| 176 |
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| 177 | /* Minimum positive values, including subnormals. */
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| 178 | #undef FLT_TRUE_MIN
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| 179 | #undef DBL_TRUE_MIN
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| 180 | #undef LDBL_TRUE_MIN
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| 181 | #define FLT_TRUE_MIN __FLT_DENORM_MIN__
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| 182 | #define DBL_TRUE_MIN __DBL_DENORM_MIN__
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| 183 | #define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
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| 184 |
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| 185 | #endif /* C11 */
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| 186 |
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| 187 | #ifdef __STDC_WANT_DEC_FP__
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| 188 | /* Draft Technical Report 24732, extension for decimal floating-point
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| 189 | arithmetic: Characteristic of decimal floating types <float.h>. */
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| 190 |
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| 191 | /* Number of base-FLT_RADIX digits in the significand, p. */
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| 192 | #undef DEC32_MANT_DIG
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| 193 | #undef DEC64_MANT_DIG
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| 194 | #undef DEC128_MANT_DIG
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| 195 | #define DEC32_MANT_DIG __DEC32_MANT_DIG__
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| 196 | #define DEC64_MANT_DIG __DEC64_MANT_DIG__
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| 197 | #define DEC128_MANT_DIG __DEC128_MANT_DIG__
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| 198 |
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| 199 | /* Minimum exponent. */
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| 200 | #undef DEC32_MIN_EXP
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| 201 | #undef DEC64_MIN_EXP
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| 202 | #undef DEC128_MIN_EXP
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| 203 | #define DEC32_MIN_EXP __DEC32_MIN_EXP__
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| 204 | #define DEC64_MIN_EXP __DEC64_MIN_EXP__
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| 205 | #define DEC128_MIN_EXP __DEC128_MIN_EXP__
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| 206 |
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| 207 | /* Maximum exponent. */
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| 208 | #undef DEC32_MAX_EXP
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| 209 | #undef DEC64_MAX_EXP
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| 210 | #undef DEC128_MAX_EXP
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| 211 | #define DEC32_MAX_EXP __DEC32_MAX_EXP__
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| 212 | #define DEC64_MAX_EXP __DEC64_MAX_EXP__
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| 213 | #define DEC128_MAX_EXP __DEC128_MAX_EXP__
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| 214 |
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| 215 | /* Maximum representable finite decimal floating-point number
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| 216 | (there are 6, 15, and 33 9s after the decimal points respectively). */
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| 217 | #undef DEC32_MAX
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| 218 | #undef DEC64_MAX
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| 219 | #undef DEC128_MAX
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| 220 | #define DEC32_MAX __DEC32_MAX__
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| 221 | #define DEC64_MAX __DEC64_MAX__
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| 222 | #define DEC128_MAX __DEC128_MAX__
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| 223 |
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| 224 | /* The difference between 1 and the least value greater than 1 that is
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| 225 | representable in the given floating point type. */
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| 226 | #undef DEC32_EPSILON
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| 227 | #undef DEC64_EPSILON
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| 228 | #undef DEC128_EPSILON
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| 229 | #define DEC32_EPSILON __DEC32_EPSILON__
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| 230 | #define DEC64_EPSILON __DEC64_EPSILON__
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| 231 | #define DEC128_EPSILON __DEC128_EPSILON__
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| 232 |
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| 233 | /* Minimum normalized positive floating-point number. */
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| 234 | #undef DEC32_MIN
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| 235 | #undef DEC64_MIN
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| 236 | #undef DEC128_MIN
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| 237 | #define DEC32_MIN __DEC32_MIN__
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| 238 | #define DEC64_MIN __DEC64_MIN__
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| 239 | #define DEC128_MIN __DEC128_MIN__
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| 240 |
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| 241 | /* Minimum subnormal positive floating-point number. */
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| 242 | #undef DEC32_SUBNORMAL_MIN
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| 243 | #undef DEC64_SUBNORMAL_MIN
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| 244 | #undef DEC128_SUBNORMAL_MIN
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| 245 | #define DEC32_SUBNORMAL_MIN __DEC32_SUBNORMAL_MIN__
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| 246 | #define DEC64_SUBNORMAL_MIN __DEC64_SUBNORMAL_MIN__
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| 247 | #define DEC128_SUBNORMAL_MIN __DEC128_SUBNORMAL_MIN__
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| 248 |
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| 249 | /* The floating-point expression evaluation method.
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| 250 | -1 indeterminate
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| 251 | 0 evaluate all operations and constants just to the range and
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| 252 | precision of the type
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| 253 | 1 evaluate operations and constants of type _Decimal32
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| 254 | and _Decimal64 to the range and precision of the _Decimal64
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| 255 | type, evaluate _Decimal128 operations and constants to the
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| 256 | range and precision of the _Decimal128 type;
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| 257 | 2 evaluate all operations and constants to the range and
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| 258 | precision of the _Decimal128 type. */
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| 259 |
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| 260 | #undef DEC_EVAL_METHOD
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| 261 | #define DEC_EVAL_METHOD __DEC_EVAL_METHOD__
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| 262 |
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| 263 | #endif /* __STDC_WANT_DEC_FP__ */
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| 264 |
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| 265 | #if defined (__MINGW32__) && ! defined (_MINGW_FLOAT_H_)
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| 266 | /* MinGW.org's runtime libraries provide a supplementary float.h, which
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| 267 | * must also be included to complement this one. Ideally that MinGW.org
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| 268 | * header should be included first, and it will include this one, but in
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| 269 | * a default configuration it doesn't normally happen this way; when we
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| 270 | * didn't see it first, include the MinGW.org header now!
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| 271 | */
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| 272 | # include_next <float.h>
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| 273 | #endif
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| 274 |
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| 275 | #endif /* _FLOAT_H___ */
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