blob: 24a38bd2d6977c9ac925cfd885eb68b8627fb84b (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/* Macros for the implementation of *cvt functions, long double version.
Copyright (C) 1996-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <float.h>
#define FLOAT_TYPE long double
#define FUNC_PREFIX q
#define FLOAT_FMT_FLAG "L"
#define FLOAT_NAME_EXT l
#define FLOAT_MIN_10_EXP LDBL_MIN_10_EXP
/* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but
we don't have log10 available in the preprocessor. Since we cannot
assume anything on the used `long double' format be generous. */
#define MAXDIG (NDIGIT_MAX + 12)
#define FCVT_MAXDIG (LDBL_MAX_10_EXP + MAXDIG)
#if LDBL_MANT_DIG == 64
# define NDIGIT_MAX 21
#elif LDBL_MANT_DIG == 53
# define NDIGIT_MAX 17
#elif LDBL_MANT_DIG == 113
# define NDIGIT_MAX 36
#elif LDBL_MANT_DIG == 106
# define NDIGIT_MAX 34
#elif LDBL_MANT_DIG == 56
# define NDIGIT_MAX 18
#else
/* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a
compile time constant here, so we cannot use it. */
# error "NDIGIT_MAX must be precomputed"
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0)))
#endif
#if LDBL_MIN_10_EXP == -37
# define FLOAT_MIN_10_NORM 1.0e-37L
#elif LDBL_MIN_10_EXP == -291
# define FLOAT_MIN_10_NORM 1.0e-291L
#elif LDBL_MIN_10_EXP == -307
# define FLOAT_MIN_10_NORM 1.0e-307L
#elif LDBL_MIN_10_EXP == -4931
# define FLOAT_MIN_10_NORM 1.0e-4931L
#else
/* libc can't depend on libm. */
# error "FLOAT_MIN_10_NORM must be precomputed"
# define FLOAT_MIN_10_NORM exp10l (LDBL_MIN_10_EXP)
#endif
|
