bsqrt.c revision 1.1.1.1 
1/* mpn_bsqrt, a^{1/2} (mod 2^n).
2
3Copyright 2009, 2010, 2012 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include "gmp.h"
21#include "gmp-impl.h"
22
23
24void
25mpn_bsqrt (mp_ptr rp, mp_srcptr ap, mp_bitcnt_t nb, mp_ptr tp)
26{
27  mp_ptr sp;
28  mp_size_t n;
29
30  ASSERT (nb > 0);
31
32  n = nb / GMP_NUMB_BITS;
33  sp = tp + n;
34
35  mpn_bsqrtinv (sp, ap, nb, tp);
36  mpn_mullo_n (rp, sp, ap, n);
37}
38