| /* Header file for constants used in floating point <-> decimal conversions. |
| Copyright (C) 1995-2018 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)) */ |
| |
| /* On some machines, _Float128 may be ABI-distinct from long double (e.g |
| IBM extended precision). */ |
| #include <bits/floatn.h> |
| |
| #if __HAVE_DISTINCT_FLOAT128 |
| # define FLT128_MAX_10_EXP_LOG 12 /* = floor(log_2(FLT128_MAX_10_EXP)) */ |
| #endif |
| |
| /* For strtold, we need powers of 10 up to floor (log_2 (LDBL_MANT_DIG |
| - LDBL_MIN_EXP + 2)). When _Float128 is enabled in libm and it is |
| ABI-distinct from long double (e.g. on powerpc64le), we also need powers |
| of 10 up to floor (log_2 (FLT128_MANT_DIG - FLT128_MIN_EXP + 2)). */ |
| #define FPIOCONST_HAVE_EXTENDED_RANGE \ |
| ((!defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024) \ |
| || __HAVE_DISTINCT_FLOAT128) |
| |
| #if FPIOCONST_HAVE_EXTENDED_RANGE |
| # 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 */ |