/* Set floating-point environment exception handling.

   Copyright (C) 2001-2018 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 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>

#include <math.h>

int

fesetexceptflag (const fexcept_t *flagp, int excepts)

{

  fenv_t temp;

  unsigned int mxcsr;

  /* XXX: Do we really need to set both the exception in both units?

     Shouldn't it be enough to set only the SSE unit?  */

  /* Get the current x87 FPU environment.  We have to do this since we

     cannot separately set the status word.  */

  __asm__ ("fnstenv %0" : "=m" (*&temp));

  temp.__status_word &= ~(excepts & FE_ALL_EXCEPT);

  temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT;

  /* Store the new status word (along with the rest of the environment.

     Possibly new exceptions are set but they won't get executed unless

     the next floating-point instruction.  */

  __asm__ ("fldenv %0" : : "m" (*&temp));

  /* And now the same for SSE.  */

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

  mxcsr &= ~(excepts & FE_ALL_EXCEPT);

  mxcsr |= *flagp & excepts & FE_ALL_EXCEPT;

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

  /* Success.  */

  return 0;

}