1/* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
2
3Copyright 1999, 2001-2002, 2006-2023 Free Software Foundation, Inc.
4Contributed by the AriC and Caramba projects, INRIA.
5
6This file is part of the GNU MPFR Library.
7
8The GNU MPFR Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MPFR Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
20https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23#include "mpfr-test.h"
24
25/* It is important to test each FE_* macro -- see the ISO C99 standard.
26   For instance, with some ARM implementations, only FE_TONEAREST may
27   be defined. */
28
29/* sets the machine rounding mode to the value rnd_mode */
30int
31mpfr_set_machine_rnd_mode (mpfr_rnd_t rnd_mode)
32{
33  switch (rnd_mode)
34    {
35    case MPFR_RNDN:
36      return
37#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST)
38        fesetround(FE_TONEAREST)
39#else
40        -1
41#endif
42        ;
43    case MPFR_RNDZ:
44      return
45#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO)
46        fesetround(FE_TOWARDZERO)
47#else
48        -1
49#endif
50        ;
51    case MPFR_RNDU:
52      return
53#if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD)
54        fesetround(FE_UPWARD)
55#else
56        -1
57#endif
58        ;
59    case MPFR_RNDD:
60      return
61#if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD)
62        fesetround(FE_DOWNWARD)
63#else
64        -1
65#endif
66        ;
67    default:
68      return -1;
69    }
70}
71