mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/* Header file for constants used in floating point <-> decimal conversions.
|
|
Copyright (C) 1995-2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _FPIOCONST_H
|
|
#define _FPIOCONST_H
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <gmp.h>
|
|
|
|
|
|
/* These values are used by __printf_fp, where they are noncritical (if the
|
|
value is not large enough, it will just be slower); and by
|
|
strtof/strtod/strtold, where it is critical (it's used for overflow
|
|
detection).
|
|
|
|
XXX These should be defined in <float.h>. For the time being, we have the
|
|
IEEE754 values here. */
|
|
|
|
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
|
|
# define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
|
|
#else
|
|
# define LDBL_MAX_10_EXP_LOG 8 /* = floor(log_2(LDBL_MAX_10_EXP)) */
|
|
#endif
|
|
#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
|
|
#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
|
|
|
|
/* For strtold, we need powers of 10 up to floor (log_2 (LDBL_MANT_DIG
|
|
- LDBL_MIN_EXP + 2)). */
|
|
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
|
|
# define FPIOCONST_POW10_ARRAY_SIZE 15
|
|
#else
|
|
# define FPIOCONST_POW10_ARRAY_SIZE 11
|
|
#endif
|
|
|
|
/* The array with the number representation. */
|
|
extern const mp_limb_t __tens[] attribute_hidden;
|
|
|
|
/* Table of powers of ten. This is used by __printf_fp and by
|
|
strtof/strtod/strtold. */
|
|
struct mp_power
|
|
{
|
|
size_t arrayoff; /* Offset in `__tens'. */
|
|
mp_size_t arraysize; /* Size of the array. */
|
|
int p_expo; /* Exponent of the number 10^(2^i). */
|
|
int m_expo; /* Exponent of the number 10^-(2^i-1). */
|
|
};
|
|
extern const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE]
|
|
attribute_hidden;
|
|
|
|
/* The constants in the array `_fpioconst_pow10' have an offset. */
|
|
#if BITS_PER_MP_LIMB == 32
|
|
# define _FPIO_CONST_OFFSET 2
|
|
#else
|
|
# define _FPIO_CONST_OFFSET 1
|
|
#endif
|
|
|
|
|
|
#endif /* fpioconst.h */
|