1 /* bignum.h-arbitrary precision integers
2 Copyright (C) 1987, 1992 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
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 2, or (at your option)
11 GAS 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
14 GNU General Public License for more details.
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
24 /***********************************************************************\
26 * Arbitrary-precision integer arithmetic. *
27 * For speed, we work in groups of bits, even though this *
28 * complicates algorithms. *
29 * Each group of bits is called a 'littlenum'. *
30 * A bunch of littlenums representing a (possibly large) *
31 * integer is called a 'bignum'. *
34 \***********************************************************************/
36 #define LITTLENUM_NUMBER_OF_BITS (16)
37 #define LITTLENUM_RADIX (1 << LITTLENUM_NUMBER_OF_BITS)
38 #define LITTLENUM_MASK (0xFFFF)
39 #define LITTLENUM_SHIFT (1)
40 #define CHARS_PER_LITTLENUM (1 << LITTLENUM_SHIFT)
42 #define BITS_PER_CHAR (8)
45 typedef unsigned short LITTLENUM_TYPE;
47 /* JF truncated this to get around a problem with GCC */
48 #define LOG_TO_BASE_2_OF_10 (3.3219280948873623478703194294893901758651)
49 /* WARNING: I haven't checked that the trailing digits are correct! */
51 /* lengths are in sizeof(littlenum)s */
54 int bignum_copy(LITTLENUM_TYPE *in, int in_length,
55 LITTLENUM_TYPE *out, int out_length);