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