libquadmath/printf/fpioconst.h

   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 */