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