1 /* bignum.h-arbitrary precision integers 2 Copyright (C) 1987-2016 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