| /* mpfr_sub_d -- subtract a machine double precision float from |
| a multiple precision floating-point number |
| |
| Copyright 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" |
| |
| int |
| mpfr_sub_d (mpfr_ptr a, mpfr_srcptr b, double c, mp_rnd_t rnd_mode) |
| { |
| int inexact; |
| mpfr_t d; |
| MPFR_SAVE_EXPO_DECL (expo); |
| |
| MPFR_LOG_FUNC (("b[%#R]=%R c=%.20g rnd=%d", b, b, c, rnd_mode), |
| ("a[%#R]=%R", a, a)); |
| |
| MPFR_SAVE_EXPO_MARK (expo); |
| |
| mpfr_init2 (d, IEEE_DBL_MANT_DIG); |
| inexact = mpfr_set_d (d, c, rnd_mode); |
| MPFR_ASSERTN (inexact == 0); |
| |
| mpfr_clear_flags (); |
| inexact = mpfr_sub (a, b, d, rnd_mode); |
| MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags); |
| |
| mpfr_clear(d); |
| MPFR_SAVE_EXPO_FREE (expo); |
| return mpfr_check_range (a, inexact, rnd_mode); |
| } |