1/* mpfr_swap (U, V) -- Swap U and V.
2
3Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4Contributed by the Arenaire and Cacao 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#include "mpfr-impl.h"
24
25/* Using memcpy is a few slower than swapping by hand. */
26
27void
28mpfr_swap (mpfr_ptr u, mpfr_ptr v)
29{
30  mpfr_prec_t p1, p2;
31  mpfr_sign_t s1, s2;
32  mpfr_exp_t e1, e2;
33  mp_limb_t *m1, *m2;
34
35  p1 = MPFR_PREC(u);
36  p2 = MPFR_PREC(v);
37  MPFR_PREC(v) = p1;
38  MPFR_PREC(u) = p2;
39
40  s1 = MPFR_SIGN(u);
41  s2 = MPFR_SIGN(v);
42  MPFR_SIGN(v) = s1;
43  MPFR_SIGN(u) = s2;
44
45  e1 = MPFR_EXP(u);
46  e2 = MPFR_EXP(v);
47  MPFR_EXP(v) = e1;
48  MPFR_EXP(u) = e2;
49
50  m1 = MPFR_MANT(u);
51  m2 = MPFR_MANT(v);
52  MPFR_MANT(v) = m1;
53  MPFR_MANT(u) = m2;
54}
55