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/* mpfr_swap (U, V) -- Swap U and V.
Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <string.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-impl.h"
/*
* We now use memcpy instead of copying the structure field by field.
* Thus we avoid copying values that may have trap representations,
* and if we change the structure in the future, this will still be
* valid. Also, there should not be any noticeable speed change in
* practice.
*/
void
mpfr_swap (mpfr_ptr u, mpfr_ptr v)
{
/*mpfr_t tmp;
memcpy (tmp, u, sizeof (mpfr_t));
memcpy (u, v, sizeof (mpfr_t));
memcpy (v, tmp, sizeof (mpfr_t));*/
mpfr_prec_t p1, p2;
mpfr_sign_t s1, s2;
mp_exp_t e1, e2;
mp_limb_t *m1, *m2;
p1 = MPFR_PREC(u);
p2 = MPFR_PREC(v);
MPFR_PREC(v) = p1;
MPFR_PREC(u) = p2;
s1 = MPFR_SIGN(u);
s2 = MPFR_SIGN(v);
MPFR_SIGN(v) = s1;
MPFR_SIGN(u) = s2;
e1 = MPFR_EXP(u);
e2 = MPFR_EXP(v);
MPFR_EXP(v) = e1;
MPFR_EXP(u) = e2;
m1 = MPFR_MANT(u);
m2 = MPFR_MANT(v);
MPFR_MANT(v) = m1;
MPFR_MANT(u) = m2;
}
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