1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
Copyright 1999, 2001-2002, 2006-2017 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-test.h"
/* It is important to test each FE_* macro -- see the ISO C99 standard.
For instance, with some ARM implementations, only FE_TONEAREST may
be defined. */
/* sets the machine rounding mode to the value rnd_mode */
int
mpfr_set_machine_rnd_mode (mpfr_rnd_t rnd_mode)
{
switch (rnd_mode)
{
case MPFR_RNDN:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST)
fesetround(FE_TONEAREST)
#else
-1
#endif
;
case MPFR_RNDZ:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO)
fesetround(FE_TOWARDZERO)
#else
-1
#endif
;
case MPFR_RNDU:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD)
fesetround(FE_UPWARD)
#else
-1
#endif
;
case MPFR_RNDD:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD)
fesetround(FE_DOWNWARD)
#else
-1
#endif
;
default:
return -1;
}
}
|
