| 1 | /* bignum.h-arbitrary precision integers |
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| 2 | Copyright 1987, 1992 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of GAS, the GNU Assembler. |
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| 5 | |
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| 6 | GAS is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | GAS is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with GAS; see the file COPYING. If not, write to |
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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| 19 | |
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| 20 | /***********************************************************************\ |
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| 21 | * * |
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| 22 | * Arbitrary-precision integer arithmetic. * |
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| 23 | * For speed, we work in groups of bits, even though this * |
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| 24 | * complicates algorithms. * |
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| 25 | * Each group of bits is called a 'littlenum'. * |
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| 26 | * A bunch of littlenums representing a (possibly large) * |
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| 27 | * integer is called a 'bignum'. * |
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| 28 | * Bignums are >= 0. * |
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| 29 | * * |
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| 30 | \***********************************************************************/ |
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| 31 | |
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| 32 | #define LITTLENUM_NUMBER_OF_BITS (16) |
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| 33 | #define LITTLENUM_RADIX (1 << LITTLENUM_NUMBER_OF_BITS) |
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| 34 | #define LITTLENUM_MASK (0xFFFF) |
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| 35 | #define LITTLENUM_SHIFT (1) |
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| 36 | #define CHARS_PER_LITTLENUM (1 << LITTLENUM_SHIFT) |
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| 37 | #ifndef BITS_PER_CHAR |
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| 38 | #define BITS_PER_CHAR (8) |
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| 39 | #endif |
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| 40 | |
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| 41 | typedef unsigned short LITTLENUM_TYPE; |
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| 42 | |
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| 43 | /* JF truncated this to get around a problem with GCC */ |
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| 44 | #define LOG_TO_BASE_2_OF_10 (3.3219280948873623478703194294893901758651) |
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| 45 | /* WARNING: I haven't checked that the trailing digits are correct! */ |
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| 46 | |
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| 47 | /* lengths are in sizeof(littlenum)s */ |
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| 48 | |
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| 49 | int bignum_copy PARAMS ((LITTLENUM_TYPE * in, int in_length, |
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| 50 | LITTLENUM_TYPE * out, int out_length)); |
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| 51 | |
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| 52 | /* end of bignum.h */ |
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