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 |
49 | extern 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. */ |
53 | struct 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 |
61 | extern 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 | |