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1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
2 | ||
e531258e | 3 | This file is part of GCC. |
d57a4b98 | 4 | |
e531258e | 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 |
7 | the Free Software Foundation; either version 2, or (at your option) | |
8 | any later version. | |
9 | ||
e531258e | 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 |
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 | |
e531258e | 16 | along with GCC; see the file COPYING. If not, write to |
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17 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
18 | Boston, MA 02110-1301, USA. */ | |
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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 | ||
981f6289 | 60 | /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */ |
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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 | #endif /* _FLOAT_H___ */ |