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1 | /* A correct <float.h>. |
2 | ||
5e8754f9 | 3 | Copyright (C) 2007-2016 Free Software Foundation, Inc. |
88b48903 WN |
4 | |
5 | This program 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 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program 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 | |
5e8754f9 | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
88b48903 WN |
17 | |
18 | #ifndef _@GUARD_PREFIX@_FLOAT_H | |
19 | ||
20 | #if __GNUC__ >= 3 | |
21 | @PRAGMA_SYSTEM_HEADER@ | |
22 | #endif | |
23 | @PRAGMA_COLUMNS@ | |
24 | ||
25 | /* The include_next requires a split double-inclusion guard. */ | |
26 | #@INCLUDE_NEXT@ @NEXT_FLOAT_H@ | |
27 | ||
28 | #ifndef _@GUARD_PREFIX@_FLOAT_H | |
29 | #define _@GUARD_PREFIX@_FLOAT_H | |
30 | ||
31 | /* 'long double' properties. */ | |
32 | ||
33 | #if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__) | |
34 | /* Number of mantissa units, in base FLT_RADIX. */ | |
35 | # undef LDBL_MANT_DIG | |
36 | # define LDBL_MANT_DIG 64 | |
37 | /* Number of decimal digits that is sufficient for representing a number. */ | |
38 | # undef LDBL_DIG | |
39 | # define LDBL_DIG 18 | |
40 | /* x-1 where x is the smallest representable number > 1. */ | |
41 | # undef LDBL_EPSILON | |
42 | # define LDBL_EPSILON 1.0842021724855044340E-19L | |
43 | /* Minimum e such that FLT_RADIX^(e-1) is a normalized number. */ | |
44 | # undef LDBL_MIN_EXP | |
45 | # define LDBL_MIN_EXP (-16381) | |
46 | /* Maximum e such that FLT_RADIX^(e-1) is a representable finite number. */ | |
47 | # undef LDBL_MAX_EXP | |
48 | # define LDBL_MAX_EXP 16384 | |
49 | /* Minimum positive normalized number. */ | |
50 | # undef LDBL_MIN | |
51 | # define LDBL_MIN 3.3621031431120935063E-4932L | |
52 | /* Maximum representable finite number. */ | |
53 | # undef LDBL_MAX | |
54 | # define LDBL_MAX 1.1897314953572317650E+4932L | |
55 | /* Minimum e such that 10^e is in the range of normalized numbers. */ | |
56 | # undef LDBL_MIN_10_EXP | |
57 | # define LDBL_MIN_10_EXP (-4931) | |
58 | /* Maximum e such that 10^e is in the range of representable finite numbers. */ | |
59 | # undef LDBL_MAX_10_EXP | |
60 | # define LDBL_MAX_10_EXP 4932 | |
61 | #endif | |
62 | ||
63 | /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of | |
64 | precision in the compiler but 64 bits of precision at runtime. See | |
5e8754f9 SDJ |
65 | <http://lists.gnu.org/archive/html/bug-gnulib/2008-07/msg00063.html>. */ |
66 | #if defined __i386__ && defined __FreeBSD__ | |
88b48903 WN |
67 | /* Number of mantissa units, in base FLT_RADIX. */ |
68 | # undef LDBL_MANT_DIG | |
69 | # define LDBL_MANT_DIG 64 | |
70 | /* Number of decimal digits that is sufficient for representing a number. */ | |
71 | # undef LDBL_DIG | |
72 | # define LDBL_DIG 18 | |
73 | /* x-1 where x is the smallest representable number > 1. */ | |
74 | # undef LDBL_EPSILON | |
75 | # define LDBL_EPSILON 1.084202172485504434007452800869941711426e-19L /* 2^-63 */ | |
76 | /* Minimum e such that FLT_RADIX^(e-1) is a normalized number. */ | |
77 | # undef LDBL_MIN_EXP | |
78 | # define LDBL_MIN_EXP (-16381) | |
79 | /* Maximum e such that FLT_RADIX^(e-1) is a representable finite number. */ | |
80 | # undef LDBL_MAX_EXP | |
81 | # define LDBL_MAX_EXP 16384 | |
82 | /* Minimum positive normalized number. */ | |
83 | # undef LDBL_MIN | |
5e8754f9 | 84 | # define LDBL_MIN 3.3621031431120935E-4932L /* = 0x1p-16382L */ |
88b48903 WN |
85 | /* Maximum representable finite number. */ |
86 | # undef LDBL_MAX | |
87 | /* LDBL_MAX is represented as { 0xFFFFFFFF, 0xFFFFFFFF, 32766 }. | |
88 | But the largest literal that GCC allows us to write is | |
89 | 0x0.fffffffffffff8p16384L = { 0xFFFFF800, 0xFFFFFFFF, 32766 }. | |
90 | So, define it like this through a reference to an external variable | |
91 | ||
92 | const unsigned int LDBL_MAX[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 32766 }; | |
93 | extern const long double LDBL_MAX; | |
94 | ||
95 | Unfortunately, this is not a constant expression. */ | |
96 | union gl_long_double_union | |
97 | { | |
98 | struct { unsigned int lo; unsigned int hi; unsigned int exponent; } xd; | |
99 | long double ld; | |
100 | }; | |
101 | extern const union gl_long_double_union gl_LDBL_MAX; | |
102 | # define LDBL_MAX (gl_LDBL_MAX.ld) | |
103 | /* Minimum e such that 10^e is in the range of normalized numbers. */ | |
104 | # undef LDBL_MIN_10_EXP | |
105 | # define LDBL_MIN_10_EXP (-4931) | |
106 | /* Maximum e such that 10^e is in the range of representable finite numbers. */ | |
107 | # undef LDBL_MAX_10_EXP | |
108 | # define LDBL_MAX_10_EXP 4932 | |
109 | #endif | |
110 | ||
111 | /* On AIX 7.1 with gcc 4.2, the values of LDBL_MIN_EXP, LDBL_MIN, LDBL_MAX are | |
112 | wrong. | |
113 | On Linux/PowerPC with gcc 4.4, the value of LDBL_MAX is wrong. */ | |
114 | #if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__ | |
115 | # undef LDBL_MIN_EXP | |
116 | # define LDBL_MIN_EXP DBL_MIN_EXP | |
117 | # undef LDBL_MIN_10_EXP | |
118 | # define LDBL_MIN_10_EXP DBL_MIN_10_EXP | |
119 | # undef LDBL_MIN | |
120 | # define LDBL_MIN 2.22507385850720138309023271733240406422e-308L /* DBL_MIN = 2^-1022 */ | |
121 | #endif | |
122 | #if (defined _ARCH_PPC || defined _POWER) && (defined _AIX || defined __linux__) && (LDBL_MANT_DIG == 106) && defined __GNUC__ | |
123 | # undef LDBL_MAX | |
124 | /* LDBL_MAX is represented as { 0x7FEFFFFF, 0xFFFFFFFF, 0x7C8FFFFF, 0xFFFFFFFF }. | |
125 | It is not easy to define: | |
126 | #define LDBL_MAX 1.79769313486231580793728971405302307166e308L | |
127 | is too small, whereas | |
128 | #define LDBL_MAX 1.79769313486231580793728971405302307167e308L | |
129 | is too large. Apparently a bug in GCC decimal-to-binary conversion. | |
130 | Also, I can't get values larger than | |
131 | #define LDBL63 ((long double) (1ULL << 63)) | |
132 | #define LDBL882 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) | |
133 | #define LDBL945 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) | |
134 | #define LDBL1008 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) | |
135 | #define LDBL_MAX (LDBL1008 * 65535.0L + LDBL945 * (long double) 9223372036821221375ULL + LDBL882 * (long double) 4611686018427387904ULL) | |
136 | which is represented as { 0x7FEFFFFF, 0xFFFFFFFF, 0x7C8FFFFF, 0xF8000000 }. | |
137 | So, define it like this through a reference to an external variable | |
138 | ||
139 | const double LDBL_MAX[2] = { DBL_MAX, DBL_MAX / (double)134217728UL / (double)134217728UL }; | |
140 | extern const long double LDBL_MAX; | |
141 | ||
142 | or through a pointer cast | |
143 | ||
144 | #define LDBL_MAX \ | |
145 | (*(const long double *) (double[]) { DBL_MAX, DBL_MAX / (double)134217728UL / (double)134217728UL }) | |
146 | ||
147 | Unfortunately, this is not a constant expression, and the latter expression | |
148 | does not work well when GCC is optimizing.. */ | |
149 | union gl_long_double_union | |
150 | { | |
151 | struct { double hi; double lo; } dd; | |
152 | long double ld; | |
153 | }; | |
154 | extern const union gl_long_double_union gl_LDBL_MAX; | |
155 | # define LDBL_MAX (gl_LDBL_MAX.ld) | |
156 | #endif | |
157 | ||
158 | /* On IRIX 6.5, with cc, the value of LDBL_MANT_DIG is wrong. | |
159 | On IRIX 6.5, with gcc 4.2, the values of LDBL_MIN_EXP, LDBL_MIN, LDBL_EPSILON | |
160 | are wrong. */ | |
161 | #if defined __sgi && (LDBL_MANT_DIG >= 106) | |
162 | # undef LDBL_MANT_DIG | |
163 | # define LDBL_MANT_DIG 106 | |
164 | # if defined __GNUC__ | |
165 | # undef LDBL_MIN_EXP | |
166 | # define LDBL_MIN_EXP DBL_MIN_EXP | |
167 | # undef LDBL_MIN_10_EXP | |
168 | # define LDBL_MIN_10_EXP DBL_MIN_10_EXP | |
169 | # undef LDBL_MIN | |
170 | # define LDBL_MIN 2.22507385850720138309023271733240406422e-308L /* DBL_MIN = 2^-1022 */ | |
171 | # undef LDBL_EPSILON | |
172 | # define LDBL_EPSILON 2.46519032881566189191165176650870696773e-32L /* 2^-105 */ | |
173 | # endif | |
174 | #endif | |
175 | ||
176 | #if @REPLACE_ITOLD@ | |
177 | /* Pull in a function that fixes the 'int' to 'long double' conversion | |
178 | of glibc 2.7. */ | |
179 | extern | |
180 | # ifdef __cplusplus | |
181 | "C" | |
182 | # endif | |
183 | void _Qp_itoq (long double *, int); | |
184 | static void (*_gl_float_fix_itold) (long double *, int) = _Qp_itoq; | |
185 | #endif | |
186 | ||
187 | #endif /* _@GUARD_PREFIX@_FLOAT_H */ | |
188 | #endif /* _@GUARD_PREFIX@_FLOAT_H */ |