summary refs log tree commit diff
path: root/sysdeps/mips/fpu/fclrexcpt.c
blob: f773312b34bc598ec6a31d368bbbcdf8c9dcb2e1 (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
/* Clear given exceptions in current floating-point environment.
   Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Jaeger <aj@suse.de>, 1998.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <fenv.h>
#include <fenv_libc.h>
#include <fpu_control.h>

int
feclearexcept (int excepts)
{
  int cw;

  /* Mask out unsupported bits/exceptions.  */
  excepts &= FE_ALL_EXCEPT;

  /* Read the complete control word.  */
  _FPU_GETCW (cw);

  /* Clear exception flag bits and cause bits. If the cause bit is not
     cleared, the next CTC instruction (just below) will re-generate the
     exception.  */

  cw &= ~(excepts | (excepts << CAUSE_SHIFT));

  /* Put the new data in effect.  */
  _FPU_SETCW (cw);

  /* Success.  */
  return 0;
}