glibc/sysdeps/hppa/fpu/fsetexcptflg.c

/* Set floating-point environment exception handling.
   Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by David Huggins-Daines <dhd@debian.org>, 2000

   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 <math.h>

int
fesetexceptflag (const fexcept_t *flagp, int excepts)
{
  unsigned int sw[2];

  /* Get the current status word. */
  __asm__ ("fstd %%fr0,0(%1)" : "=m" (*sw) : "r" (sw));

  /* Install new enable trap bits  */
  sw[0] |= (*flagp & excepts & FE_ALL_EXCEPT) << 27;

  /* Store the new status word.  */
  __asm__ ("fldd 0(%0),%%fr0" : : "r" (sw));

  /* Success.  */
  return 0;
}