Annotation of OpenXM_contrib/gmp/mpfr/sqrt_ui.c, Revision 1.1.1.1
1.1 ohara 1: /* mpfr_sqrt_ui -- square root of a machine integer
2:
3: Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
4:
5: This file is part of the MPFR Library.
6:
7: The MPFR Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Lesser General Public License as published by
9: the Free Software Foundation; either version 2.1 of the License, or (at your
10: option) any later version.
11:
12: The MPFR Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Lesser General Public License
18: along with the MPFR Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include "gmp.h"
23: #include "gmp-impl.h"
24: #include "longlong.h"
25: #include "mpfr.h"
26: #include "mpfr-impl.h"
27:
28: int
29: mpfr_sqrt_ui (mpfr_ptr r, unsigned long u, mp_rnd_t rnd_mode)
30: {
31: if (u)
32: {
33: mpfr_t uu;
34: mp_limb_t up[1];
35: unsigned long cnt;
36: int inex;
37:
38: MPFR_INIT1(up, uu, BITS_PER_MP_LIMB, 1);
39: count_leading_zeros (cnt, (mp_limb_t) u);
40: *up = (mp_limb_t) u << cnt;
41: MPFR_EXP(uu) = BITS_PER_MP_LIMB - cnt;
42:
43: mpfr_save_emin_emax();
44: inex = mpfr_sqrt(r, uu, rnd_mode);
45: MPFR_RESTORE_RET(inex, r, rnd_mode);
46: }
47: else /* sqrt(0) = 0 */
48: {
49: MPFR_CLEAR_FLAGS(r);
50: MPFR_SET_ZERO(r);
51: MPFR_SET_POS(r);
52: MPFR_RET(0);
53: }
54: }
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