1/* Header file for constants used in floating point <-> decimal conversions.
2 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
20
21#ifndef _FPIOCONST_H
22#define _FPIOCONST_H
23
24#include <float.h>
25#include <math.h>
26
27
28/* These values are used by __printf_fp, where they are noncritical (if the
29 value is not large enough, it will just be slower); and by
30 strtof/strtod/strtold, where it is critical (it's used for overflow
31 detection).
32
33 XXX These should be defined in <float.h>. For the time being, we have the
34 IEEE754 values here. */
35
36#define FLT128_MAX_10_EXP_LOG 12 /* = floor(log_2(FLT128_MAX_10_EXP)) */
37
38/* For strtoq, we need powers of 10 up to floor (log_2 (FLT128_MANT_DIG
39 - FLT128_MIN_EXP + 2)). */
40#if !defined __NO_LONG_DOUBLE_MATH && FLT128_MAX_EXP > 1024
41# define FPIOCONST_POW10_ARRAY_SIZE 15
42#else
43# define FPIOCONST_POW10_ARRAY_SIZE 11
44#endif
45
46
47/* The array with the number representation. */
48#define __tens __quadmath_tens
49extern const mp_limb_t __tens[] attribute_hidden;
50
51/* Table of powers of ten. This is used by __printf_fp and by
52 strtof/strtod/strtold. */
53struct mp_power
54 {
55 size_t arrayoff; /* Offset in `__tens'. */
56 mp_size_t arraysize; /* Size of the array. */
57 int p_expo; /* Exponent of the number 10^(2^i). */
58 int m_expo; /* Exponent of the number 10^-(2^i-1). */
59 };
60#define _fpioconst_pow10 __quadmath_fpioconst_pow10
61extern const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE]
62 attribute_hidden;
63
64/* The constants in the array `_fpioconst_pow10' have an offset. */
65#if BITS_PER_MP_LIMB == 32
66# define _FPIO_CONST_OFFSET 2
67#else
68# define _FPIO_CONST_OFFSET 1
69#endif
70
71
72#endif /* fpioconst.h */
73