1/* mpfr_neg -- change the sign of a floating-point number 2 3Copyright 1999, 2000, 2001, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 4Contributed by the AriC and Caramel 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 25int 26mpfr_neg (mpfr_ptr a, mpfr_srcptr b, mpfr_rnd_t rnd_mode) 27{ 28 if (MPFR_UNLIKELY(a != b)) 29 return mpfr_set4 (a, b, rnd_mode, -MPFR_SIGN(b)); 30 else if (MPFR_UNLIKELY(MPFR_IS_NAN (b))) 31 { 32 MPFR_RET_NAN; 33 } 34 else 35 { 36 MPFR_CHANGE_SIGN(a); 37 MPFR_RET(0); 38 } 39} 40