1/* mpfr_dim -- positive difference 2 3Copyright 2001, 2002, 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 25/* dim (x,y) is defined as: 26 27 x-y if x > y 28 +0 if x <= y 29*/ 30 31int 32mpfr_dim (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode) 33{ 34 if (MPFR_IS_NAN(x) || MPFR_IS_NAN(y)) 35 { 36 MPFR_SET_NAN(z); 37 MPFR_RET_NAN; 38 } 39 40 if (mpfr_cmp (x,y) > 0) 41 return mpfr_sub (z, x, y, rnd_mode); 42 else 43 { 44 MPFR_SET_ZERO(z); 45 MPFR_SET_POS(z); 46 MPFR_RET(0); 47 } 48} 49