bignum.h

早期freebsd实现

/* bignum.h-arbitrary precision integers
   Copyright (C) 1987 Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/***********************************************************************\
*									*
*	Arbitrary-precision integer arithmetic.				*
*	For speed, we work in groups of bits, even though this		*
*	complicates algorithms.						*
*	Each group of bits is called a 'littlenum'.			*
*	A bunch of littlenums representing a (possibly large)		*
*	integer is called a 'bignum'.					*
*	Bignums are >= 0.						*
*									*
\***********************************************************************/

#define	LITTLENUM_NUMBER_OF_BITS	(16)
#define	LITTLENUM_RADIX			(1 << LITTLENUM_NUMBER_OF_BITS)
#define	LITTLENUM_MASK			(0xFFFF)
#define LITTLENUM_SHIFT			(1)
#define CHARS_PER_LITTLENUM		(1 << LITTLENUM_SHIFT)
#ifndef BITS_PER_CHAR
#define BITS_PER_CHAR			(8)
#endif

typedef unsigned short int	LITTLENUM_TYPE;


/* JF truncated this to get around a problem with GCC */
#define	LOG_TO_BASE_2_OF_10		(3.3219280948873623478703194294893901758651 )
				/* WARNING: I haven't checked that the trailing digits are correct! */

/* end: bignum.h */