sysdeps/mips/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Jaeger <aj@suse.de>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <fenv_libc.h>
  23 #include <fpu_control.h>
  24
  25 int
  26 feclearexcept (int excepts)
  27 {
  28   int cw;
  29
  30   /* Mask out unsupported bits/exceptions.  */
  31   excepts &= FE_ALL_EXCEPT;
  32
  33   /* Read the complete control word.  */
  34   _FPU_GETCW (cw);
  35
  36   /* Clear exception flag bits and cause bits. If the cause bit is not
  37      cleared, the next CTC instruction (just below) will re-generate the
  38      exception.  */
  39
  40   cw &= ~(excepts | (excepts << CAUSE_SHIFT));
  41
  42   /* Put the new data in effect.  */
  43   _FPU_SETCW (cw);
  44
  45   /* Success.  */
  46   return 0;
  47 }