1/* mpfr_sqrt_ui -- square root of a machine integer 2 3Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 4Contributed by the AriC and Caramel projects, INRIA. 5 6This file is part of the GNU MPFR Library. 7 8The GNU MPFR Library is free software; you can redistribute it and/or modify 9it under the terms of the GNU Lesser General Public License as published by 10the Free Software Foundation; either version 3 of the License, or (at your 11option) any later version. 12 13The GNU MPFR Library is distributed in the hope that it will be useful, but 14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16License for more details. 17 18You should have received a copy of the GNU Lesser General Public License 19along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23#define MPFR_NEED_LONGLONG_H 24#include "mpfr-impl.h" 25 26int 27mpfr_sqrt_ui (mpfr_ptr r, unsigned long u, mpfr_rnd_t rnd_mode) 28{ 29 if (u) 30 { 31 mpfr_t uu; 32 mp_limb_t up[1]; 33 unsigned long cnt; 34 int inex; 35 MPFR_SAVE_EXPO_DECL (expo); 36 37 MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS); 38 MPFR_ASSERTN (u == (mp_limb_t) u); 39 count_leading_zeros (cnt, (mp_limb_t) u); 40 *up = (mp_limb_t) u << cnt; 41 42 MPFR_SAVE_EXPO_MARK (expo); 43 MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt); 44 inex = mpfr_sqrt(r, uu, rnd_mode); 45 MPFR_SAVE_EXPO_FREE (expo); 46 return mpfr_check_range(r, inex, rnd_mode); 47 } 48 else /* sqrt(0) = 0 */ 49 { 50 MPFR_SET_ZERO(r); 51 MPFR_SET_POS(r); 52 MPFR_RET(0); 53 } 54} 55