1 /* mpz_gcdext(g, s, t, a, b) -- Set G to gcd(a, b), and S and T such that
4 Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
6 This file is part of the GNU MP Library.
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Library General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or (at your
11 option) any later version.
13 The GNU MP Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
16 License for more details.
18 You should have received a copy of the GNU Library General Public License
19 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 MA 02111-1307, USA. */
30 mpz_gcdext (mpz_ptr g, mpz_ptr s, mpz_ptr t, mpz_srcptr a, mpz_srcptr b)
32 mpz_gcdext (g, s, t, a, b)
40 mpz_t s0, s1, q, r, x, d0, d1;
42 mpz_init_set_ui (s0, 1L);
43 mpz_init_set_ui (s1, 0L);
50 while (d1->_mp_size != 0)
52 mpz_tdiv_qr (q, r, d0, d1);
75 g->_mp_size = -g->_mp_size;
76 s->_mp_size = -s->_mp_size;
78 t->_mp_size = -t->_mp_size;