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  1. /* bignum.h-arbitrary precision integers
  2.    Copyright 1987, 1992, 2003, 2005, 2007 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  6.    GAS is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 3, or (at your option)
  9.    any later version.
  10.  
  11.    GAS is distributed in the hope that it will be useful, but WITHOUT
  12.    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13.    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14.    License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with GAS; see the file COPYING.  If not, write to
  18.    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  19.    Boston, MA 02110-1301, USA.  */
  20.  
  21. /***********************************************************************\
  22.  *                                                                      *
  23.  *      Arbitrary-precision integer arithmetic.                         *
  24.  *      For speed, we work in groups of bits, even though this          *
  25.  *      complicates algorithms.                                         *
  26.  *      Each group of bits is called a 'littlenum'.                     *
  27.  *      A bunch of littlenums representing a (possibly large)           *
  28.  *      integer is called a 'bignum'.                                   *
  29.  *      Bignums are >= 0.                                               *
  30.  *                                                                      *
  31.  \***********************************************************************/
  32.  
  33. #define LITTLENUM_NUMBER_OF_BITS        (16)
  34. #define LITTLENUM_RADIX                 (1 << LITTLENUM_NUMBER_OF_BITS)
  35. #define LITTLENUM_MASK                  (0xFFFF)
  36. #define LITTLENUM_SHIFT                 (1)
  37. #define CHARS_PER_LITTLENUM             (1 << LITTLENUM_SHIFT)
  38. #ifndef BITS_PER_CHAR
  39. #define BITS_PER_CHAR                   (8)
  40. #endif
  41.  
  42. typedef unsigned short LITTLENUM_TYPE;
  43.