/* Enable floating-point exceptions.

   Copyright (C) 2001-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Andreas Jaeger <aj@suse.de>, 2001.

   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>

int

feenableexcept (int excepts)

{

  unsigned short int new_exc, old_exc;

  unsigned int new;

  excepts &= FE_ALL_EXCEPT;

  /* Get the current control word of the x87 FPU.  */

  __asm__ ("fstcw %0" : "=m" (*&new_exc));

  old_exc = (~new_exc) & FE_ALL_EXCEPT;

  new_exc &= ~excepts;

  __asm__ ("fldcw %0" : : "m" (*&new_exc));

  /* And now the same for the SSE MXCSR register.  */

  __asm__ ("stmxcsr %0" : "=m" (*&new));

  /* The SSE exception masks are shifted by 7 bits.  */

  new &= ~(excepts << 7);

  __asm__ ("ldmxcsr %0" : : "m" (*&new));

  return old_exc;

}