/* Set floating-point environment exception handling.
   Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <fenv_libc.h>

void
fesetexceptflag (const fexcept_t *flagp, int excepts)
{
  fenv_union_t u;
  fexcept_t flag;

  /* Get the current state.  */
  u.fenv = fegetenv_register ();

  /* Ignore exceptions not listed in 'excepts'.  */
  flag = *flagp & excepts;

  /* Replace the exception status */
  u.l[1] = (u.l[1] & ~(FPSCR_STICKY_BITS & excepts)
	    | flag & FPSCR_STICKY_BITS
	    | (flag >> (31 - FPSCR_VX) - (31 - FPSCR_VXSOFT)
	       & FE_INVALID_SOFTWARE));

  /* Store the new status word (along with the rest of the environment).
     This may cause floating-point exceptions if the restored state
     requests it.  */
  fesetenv_register (u.fenv);

  /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips.  */
  if (flag & FE_INVALID)
    feraiseexcept(FE_INVALID);
}