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      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