diff options
Diffstat (limited to 'REORG.TODO/stdlib/fpioconst.h')
| -rw-r--r-- | REORG.TODO/stdlib/fpioconst.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/REORG.TODO/stdlib/fpioconst.h b/REORG.TODO/stdlib/fpioconst.h new file mode 100644 index 0000000000..c05f8e7bac --- /dev/null +++ b/REORG.TODO/stdlib/fpioconst.h @@ -0,0 +1,88 @@ +/* Header file for constants used in floating point <-> decimal conversions. + Copyright (C) 1995-2017 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 */ |