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/* mpfr_add_si -- add a floating-point number with a machine integer
mpfr_sub_si -- sub a floating-point number with a machine integer
mpfr_si_sub -- sub a machine number with a floating-point number
Copyright 2004-2013 Free Software Foundation, Inc.
Contributed by the AriC and Caramel 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_add_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode)
{
if (u >= 0)
return mpfr_add_ui (y, x, u, rnd_mode);
else
return mpfr_sub_ui (y, x, -u, rnd_mode);
}
int
mpfr_sub_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode)
{
if (u >= 0)
return mpfr_sub_ui (y, x, u, rnd_mode);
else
return mpfr_add_ui (y, x, -u, rnd_mode);
}
int
mpfr_si_sub (mpfr_ptr y, long int u, mpfr_srcptr x, mpfr_rnd_t rnd_mode)
{
if (u >= 0)
return mpfr_ui_sub (y, u, x, rnd_mode);
else
{
int res = -mpfr_add_ui (y, x, -u, MPFR_INVERT_RND (rnd_mode));
MPFR_CHANGE_SIGN (y);
return res;
}
}
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