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