| /* mpfr_dim -- positive difference |
| |
| Copyright 2001, 2002, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| Contributed by the Arenaire and Cacao 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 2.1 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.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #include "mpfr-impl.h" |
| |
| /* dim (x,y) is defined as: |
| |
| x-y if x > y |
| +0 if x <= y |
| */ |
| |
| int |
| mpfr_dim (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mp_rnd_t rnd_mode) |
| { |
| if (MPFR_IS_NAN(x) || MPFR_IS_NAN(y)) |
| { |
| MPFR_SET_NAN(z); |
| MPFR_RET_NAN; |
| } |
| |
| if (mpfr_cmp (x,y) > 0) |
| return mpfr_sub (z, x, y, rnd_mode); |
| else |
| { |
| MPFR_SET_ZERO(z); |
| MPFR_SET_POS(z); |
| MPFR_RET(0); |
| } |
| } |