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 */