76235ed48f
1998-12-28 Ulrich Drepper <drepper@cygnus.com> * stdlib/fpioconst.c: If __NO_LONG_DOUBLE_MATH don't define constants beyond range of double. * stdlib/fpioconst.h (_fpioconst_pow10): Reduce size according to fpioconst.c change. * stdlib/strtold.c: Fall back on double functions if __NO_LONG_DOUBLE_MATH. * stdlib/strtold_l.c: Likewise. * wcsmbs/wcstold.c: Likewise. * wcsmbs/wcstold_l.c: Likewise. * sysdeps/ieee754/ldbl2mpn.c: Don't generate code if __NO_LONG_DOUBLE_MATH. * sysdeps/ieee754/mpn2ldbl.c: Likewise. 1998-12-28 Geoff Keating <geoffk@ozemail.com.au> * sysdeps/powerpc/bits/endian.h: Use #warning, not #error, if the endianness can't be determined, for makedepend.
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* Header file for constants used in floating point <-> decimal conversions.
|
|
Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#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. */
|
|
|
|
#define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
|
|
#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)) */
|
|
|
|
|
|
/* Table of powers of ten. This is used by __printf_fp and by
|
|
strtof/strtod/strtold. */
|
|
struct mp_power
|
|
{
|
|
const mp_limb_t *array; /* The array with the number representation. */
|
|
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). */
|
|
};
|
|
#ifndef __NO_LONG_DOUBLE_MATH
|
|
extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1];
|
|
#else
|
|
extern const struct mp_power _fpioconst_pow10[DBL_MAX_10_EXP_LOG + 1];
|
|
#endif
|
|
|
|
/* 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 */
|