1 /* mpz_gcd_ui -- Calculate the greatest common divisior of two integers.
3 Copyright (C) 1994, 1996 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15 License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
27 mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)
38 size = ABS (u->_mp_size);
44 if (w != NULL && u != w)
46 if (w->_mp_alloc < size)
47 _mpz_realloc (w, size);
49 MPN_COPY (w->_mp_d, u->_mp_d, size);
52 /* We can't return any useful result for gcd(big,0). */
53 return size > 1 ? 0 : w->_mp_d[0];
56 res = mpn_gcd_1 (u->_mp_d, size, v);