1 1.1 mrg /* Header file for constants used in floating point <-> decimal conversions. 2 1.1 mrg Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003 3 1.1 mrg Free Software Foundation, Inc. 4 1.1 mrg This file is part of the GNU C Library. 5 1.1 mrg 6 1.1 mrg The GNU C Library is free software; you can redistribute it and/or 7 1.1 mrg modify it under the terms of the GNU Lesser General Public 8 1.1 mrg License as published by the Free Software Foundation; either 9 1.1 mrg version 2.1 of the License, or (at your option) any later version. 10 1.1 mrg 11 1.1 mrg The GNU C Library is distributed in the hope that it will be useful, 12 1.1 mrg but WITHOUT ANY WARRANTY; without even the implied warranty of 13 1.1 mrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 1.1 mrg Lesser General Public License for more details. 15 1.1 mrg 16 1.1 mrg You should have received a copy of the GNU Lesser General Public 17 1.1 mrg License along with the GNU C Library; if not, write to the Free 18 1.1 mrg Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 1.1 mrg 02111-1307 USA. */ 20 1.1 mrg 21 1.1 mrg #ifndef _FPIOCONST_H 22 1.1 mrg #define _FPIOCONST_H 23 1.1 mrg 24 1.1 mrg #include <float.h> 25 1.1 mrg #include <math.h> 26 1.1 mrg 27 1.1 mrg 28 1.1 mrg /* These values are used by __printf_fp, where they are noncritical (if the 29 1.1 mrg value is not large enough, it will just be slower); and by 30 1.1 mrg strtof/strtod/strtold, where it is critical (it's used for overflow 31 1.1 mrg detection). 32 1.1 mrg 33 1.1 mrg XXX These should be defined in <float.h>. For the time being, we have the 34 1.1 mrg IEEE754 values here. */ 35 1.1 mrg 36 1.1 mrg #define FLT128_MAX_10_EXP_LOG 12 /* = floor(log_2(FLT128_MAX_10_EXP)) */ 37 1.1 mrg 38 1.1 mrg /* For strtoq, we need powers of 10 up to floor (log_2 (FLT128_MANT_DIG 39 1.1 mrg - FLT128_MIN_EXP + 2)). */ 40 1.1 mrg #if !defined __NO_LONG_DOUBLE_MATH && FLT128_MAX_EXP > 1024 41 1.1 mrg # define FPIOCONST_POW10_ARRAY_SIZE 15 42 1.1 mrg #else 43 1.1 mrg # define FPIOCONST_POW10_ARRAY_SIZE 11 44 1.1 mrg #endif 45 1.1 mrg 46 1.1 mrg 47 1.1 mrg /* The array with the number representation. */ 48 1.1 mrg #define __tens __quadmath_tens 49 1.1 mrg extern const mp_limb_t __tens[] attribute_hidden; 50 1.1 mrg 51 1.1 mrg /* Table of powers of ten. This is used by __printf_fp and by 52 1.1 mrg strtof/strtod/strtold. */ 53 1.1 mrg struct mp_power 54 1.1 mrg { 55 1.1 mrg size_t arrayoff; /* Offset in `__tens'. */ 56 1.1 mrg mp_size_t arraysize; /* Size of the array. */ 57 1.1 mrg int p_expo; /* Exponent of the number 10^(2^i). */ 58 1.1 mrg int m_expo; /* Exponent of the number 10^-(2^i-1). */ 59 1.1 mrg }; 60 1.1 mrg #define _fpioconst_pow10 __quadmath_fpioconst_pow10 61 1.1 mrg extern const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE] 62 1.1 mrg attribute_hidden; 63 1.1 mrg 64 1.1 mrg /* The constants in the array `_fpioconst_pow10' have an offset. */ 65 1.1 mrg #if BITS_PER_MP_LIMB == 32 66 1.1 mrg # define _FPIO_CONST_OFFSET 2 67 1.1 mrg #else 68 1.1 mrg # define _FPIO_CONST_OFFSET 1 69 1.1 mrg #endif 70 1.1 mrg 71 1.1 mrg 72 1.1 mrg #endif /* fpioconst.h */ 73
Indexes created Sun Mar 01 05:31:48 UTC 2026