50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
|
/* mpfr_sub_d -- subtract a machine double precision float from
|
||
|
|
a multiple precision floating-point number
|
||
|
|
|
||
|
|
Copyright 2007, 2008, 2009, 2010, 2011 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 3 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.LESSER. If not, see
|
||
|
|
http://www.gnu.org/licenses/ or 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, mpfr_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);
|
||
|
|
}
|