gas/bignum.h

   1 /* bignum.h-arbitrary precision integers
   2    Copyright (C) 1987-2022 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;