/* Store current floating-point environment and clear exceptions.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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 <unistd.h>

#include <ldsodefs.h>

#include <dl-procinfo.h>

int

__feholdexcept (fenv_t *envp)

{

  /* Store the environment.  Recall that fnstenv has a side effect of

     masking all exceptions.  Then clear all exceptions.  */

  __asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp));

  /* If the CPU supports SSE we set the MXCSR as well.  */

  if (HAS_CPU_FEATURE (SSE))

    {

      unsigned int xwork;

      /* Get the current control word.  */

      __asm__ ("stmxcsr %0" : "=m" (envp->__eip));

      /* Set all exceptions to non-stop and clear them.  */

      xwork = (envp->__eip | 0x1f80) & ~0x3f;

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

    }

  return 0;

}

libm_hidden_def (__feholdexcept)

weak_alias (__feholdexcept, feholdexcept)

libm_hidden_weak (feholdexcept)