1 /* mpfr_sqrt_ui -- square root of a machine integer
3 Copyright 2000-2004, 2006-2016 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramba projects, INRIA.
6 This file is part of the GNU MPFR Library.
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
13 The GNU MPFR 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 Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #define MPFR_NEED_LONGLONG_H
24 #include "mpfr-impl.h"
27 mpfr_sqrt_ui (mpfr_ptr r
, unsigned long u
, mpfr_rnd_t rnd_mode
)
35 MPFR_SAVE_EXPO_DECL (expo
);
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
;
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
);
48 else /* sqrt(0) = 0 */