about summary refs log tree commit diff
path: root/ports/sysdeps/arm/fesetround.c
blob: 6de1644a7a68f1106f744197f89c46ecfa390bda (plain) (blame)
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
/* Set current rounding direction.
   Copyright (C) 2004-2012 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

#include <fenv.h>
#include <fpu_control.h>
#include <arm-features.h>


int
fesetround (int round)
{
  if (ARM_HAVE_VFP)
    {
      fpu_control_t temp;

      switch (round)
	{
	case FE_TONEAREST:
	case FE_UPWARD:
	case FE_DOWNWARD:
	case FE_TOWARDZERO:
	  _FPU_GETCW (temp);
	  temp = (temp & ~FE_TOWARDZERO) | round;
	  _FPU_SETCW (temp);
	  return 0;
	default:
	  return 1;
	}
    }
  else if (round == FE_TONEAREST)
    /* This is the only supported rounding mode for soft-fp.  */
    return 0;

  /* Unsupported, so fail.  */
  return 1;
}

libm_hidden_def (fesetround)