bignum.h revision 33965 
1/* bignum.h-arbitrary precision integers
2   Copyright (C) 1987, 1992 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 2, or (at your option)
9   any later version.
10
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.
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
19
20/***********************************************************************\
21 *									*
22 *	Arbitrary-precision integer arithmetic.				*
23 *	For speed, we work in groups of bits, even though this		*
24 *	complicates algorithms.						*
25 *	Each group of bits is called a 'littlenum'.			*
26 *	A bunch of littlenums representing a (possibly large)		*
27 *	integer is called a 'bignum'.					*
28 *	Bignums are >= 0.						*
29 *									*
30 \***********************************************************************/
31
32#define	LITTLENUM_NUMBER_OF_BITS	(16)
33#define	LITTLENUM_RADIX			(1 << LITTLENUM_NUMBER_OF_BITS)
34#define	LITTLENUM_MASK			(0xFFFF)
35#define LITTLENUM_SHIFT			(1)
36#define CHARS_PER_LITTLENUM		(1 << LITTLENUM_SHIFT)
37#ifndef BITS_PER_CHAR
38#define BITS_PER_CHAR			(8)
39#endif
40
41typedef unsigned short LITTLENUM_TYPE;
42
43/* JF truncated this to get around a problem with GCC */
44#define	LOG_TO_BASE_2_OF_10 (3.3219280948873623478703194294893901758651)
45/* WARNING: I haven't checked that the trailing digits are correct! */
46
47/* lengths are in sizeof(littlenum)s */
48
49int bignum_copy PARAMS ((LITTLENUM_TYPE * in, int in_length,
50			 LITTLENUM_TYPE * out, int out_length));
51
52/* end of bignum.h */
53