/* Header file for constants used in floating point <-> decimal conversions. Copyright (C) 1995-2015 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 */