v3_1_6/src/swap.c

/* mpfr_swap (U, V) -- Swap U and V.

Copyright 2000-2004, 2006-2017 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU 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 3 of the License, or (at your
option) any later version.

The GNU 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 GNU MPFR Library; see the file COPYING.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

#include "third_party/mpfr/v3_1_6/src/mpfr-impl.h"

/* Using memcpy is a few slower than swapping by hand. */

void
mpfr_swap (mpfr_ptr u, mpfr_ptr v)
{
  mpfr_prec_t p1, p2;
  mpfr_sign_t s1, s2;
  mpfr_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;
}