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e18a3057 | 1 | /* Macros for the implementation of *cvt functions, double version. |
2b778ceb | 2 | Copyright (C) 1995-2021 Free Software Foundation, Inc. |
e18a3057 GG |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library 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 GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <float.h> | |
20 | ||
21 | #define FLOAT_TYPE double | |
22 | #define FUNC_PREFIX | |
23 | #define FLOAT_FMT_FLAG | |
24 | #define FLOAT_NAME_EXT | |
25 | #define FLOAT_MIN_10_EXP DBL_MIN_10_EXP | |
26 | /* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we | |
27 | don't have log10 available in the preprocessor. */ | |
28 | #define MAXDIG (NDIGIT_MAX + 3) | |
29 | #define FCVT_MAXDIG (DBL_MAX_10_EXP + MAXDIG) | |
30 | #if DBL_MANT_DIG == 53 | |
31 | # define NDIGIT_MAX 17 | |
32 | #elif DBL_MANT_DIG == 24 | |
33 | # define NDIGIT_MAX 9 | |
34 | #elif DBL_MANT_DIG == 56 | |
35 | # define NDIGIT_MAX 18 | |
36 | #else | |
37 | /* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a | |
38 | compile time constant here, so we cannot use it. */ | |
39 | # error "NDIGIT_MAX must be precomputed" | |
40 | # define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0))) | |
41 | #endif | |
42 | #if DBL_MIN_10_EXP == -37 | |
43 | # define FLOAT_MIN_10_NORM 1.0e-37 | |
44 | #elif DBL_MIN_10_EXP == -307 | |
45 | # define FLOAT_MIN_10_NORM 1.0e-307 | |
46 | #elif DBL_MIN_10_EXP == -4931 | |
47 | # define FLOAT_MIN_10_NORM 1.0e-4931 | |
48 | #else | |
49 | /* libc can't depend on libm. */ | |
50 | # error "FLOAT_MIN_10_NORM must be precomputed" | |
51 | # define FLOAT_MIN_10_NORM exp10 (DBL_MIN_10_EXP) | |
52 | #endif |