1/* mpfr_add_si -- add a floating-point number with a machine integer
2   mpfr_sub_si -- sub  a floating-point number with a machine integer
3   mpfr_si_sub -- sub  a machine number with a floating-point number
4
5Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
6Contributed by the AriC and Caramel projects, INRIA.
7
8This file is part of the GNU MPFR Library.
9
10The GNU MPFR Library is free software; you can redistribute it and/or modify
11it under the terms of the GNU Lesser General Public License as published by
12the Free Software Foundation; either version 3 of the License, or (at your
13option) any later version.
14
15The GNU MPFR Library is distributed in the hope that it will be useful, but
16WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
18License for more details.
19
20You should have received a copy of the GNU Lesser General Public License
21along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
22http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2351 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
24
25#include "mpfr-impl.h"
26
27int
28mpfr_add_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode)
29{
30  if (u >= 0)
31    return mpfr_add_ui (y, x, u, rnd_mode);
32  else
33    return mpfr_sub_ui (y, x, -u, rnd_mode);
34}
35
36int
37mpfr_sub_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode)
38{
39  if (u >= 0)
40    return mpfr_sub_ui (y, x, u, rnd_mode);
41  else
42    return mpfr_add_ui (y, x, -u, rnd_mode);
43}
44
45int
46mpfr_si_sub (mpfr_ptr y, long int u, mpfr_srcptr x, mpfr_rnd_t rnd_mode)
47{
48  if (u >= 0)
49    return mpfr_ui_sub (y, u, x, rnd_mode);
50  else
51    {
52    int res = -mpfr_add_ui (y, x, -u, MPFR_INVERT_RND (rnd_mode));
53    MPFR_CHANGE_SIGN (y);
54    return res;
55    }
56}
57
58