53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/* Macros for the implementation of *cvt functions, double version.
|
|
Copyright (C) 1995-2021 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 double
|
|
#define FUNC_PREFIX
|
|
#define FLOAT_FMT_FLAG
|
|
#define FLOAT_NAME_EXT
|
|
#define FLOAT_MIN_10_EXP DBL_MIN_10_EXP
|
|
/* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we
|
|
don't have log10 available in the preprocessor. */
|
|
#define MAXDIG (NDIGIT_MAX + 3)
|
|
#define FCVT_MAXDIG (DBL_MAX_10_EXP + MAXDIG)
|
|
#if DBL_MANT_DIG == 53
|
|
# define NDIGIT_MAX 17
|
|
#elif DBL_MANT_DIG == 24
|
|
# define NDIGIT_MAX 9
|
|
#elif DBL_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 * DBL_MANT_DIG + 1.0)))
|
|
#endif
|
|
#if DBL_MIN_10_EXP == -37
|
|
# define FLOAT_MIN_10_NORM 1.0e-37
|
|
#elif DBL_MIN_10_EXP == -307
|
|
# define FLOAT_MIN_10_NORM 1.0e-307
|
|
#elif DBL_MIN_10_EXP == -4931
|
|
# define FLOAT_MIN_10_NORM 1.0e-4931
|
|
#else
|
|
/* libc can't depend on libm. */
|
|
# error "FLOAT_MIN_10_NORM must be precomputed"
|
|
# define FLOAT_MIN_10_NORM exp10 (DBL_MIN_10_EXP)
|
|
#endif
|