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/* mpfr_sub_d -- subtract a machine double precision float from
a multiple precision floating-point number
Copyright 2007-2017 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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[%Pu]=%.*Rg c=%.20g rnd=%d",
mpfr_get_prec (b), mpfr_log_prec, b, c, rnd_mode),
("a[%Pu]=%.*Rg", mpfr_get_prec (a), mpfr_log_prec, 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);
}
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