1/* mpfr_d_sub -- subtract a multiple precision floating-point number 2 from a machine double precision float 3 4Copyright 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 5Contributed by the Arenaire and Cacao projects, INRIA. 6 7This file is part of the GNU MPFR Library. 8 9The GNU MPFR Library is free software; you can redistribute it and/or modify 10it under the terms of the GNU Lesser General Public License as published by 11the Free Software Foundation; either version 3 of the License, or (at your 12option) any later version. 13 14The GNU MPFR Library is distributed in the hope that it will be useful, but 15WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17License for more details. 18 19You should have received a copy of the GNU Lesser General Public License 20along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 21http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 2251 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 23 24#include "mpfr-impl.h" 25 26int 27mpfr_d_sub (mpfr_ptr a, double b, mpfr_srcptr c, mpfr_rnd_t rnd_mode) 28{ 29 int inexact; 30 mpfr_t d; 31 MPFR_SAVE_EXPO_DECL (expo); 32 33 MPFR_LOG_FUNC (("b=%.20g c[%#R]=%R rnd=%d", b, c, c, rnd_mode), 34 ("a[%#R]=%R", a, a)); 35 36 MPFR_SAVE_EXPO_MARK (expo); 37 38 mpfr_init2 (d, IEEE_DBL_MANT_DIG); 39 inexact = mpfr_set_d (d, b, rnd_mode); 40 MPFR_ASSERTN (inexact == 0); 41 42 mpfr_clear_flags (); 43 inexact = mpfr_sub (a, d, c, rnd_mode); 44 MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags); 45 46 mpfr_clear(d); 47 MPFR_SAVE_EXPO_FREE (expo); 48 return mpfr_check_range (a, inexact, rnd_mode); 49} 50