/* Copyright (C) 1997-2018 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 <fpu_control.h>

int

__fesetenv (const fenv_t *envp)

{

  fpu_control_t fpcr;

  fpu_control_t fpcr_new;

  fpu_control_t updated_fpcr;

  fpu_fpsr_t fpsr;

  fpu_fpsr_t fpsr_new;

  _FPU_GETCW (fpcr);

  if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))

    {

      /* The new FPCR/FPSR are valid, so don't merge the reserved flags.  */

      fpcr_new = envp->__fpcr;

      if (fpcr != fpcr_new)

	_FPU_SETCW (fpcr_new);

      _FPU_SETFPSR (envp->__fpsr);

      return 0;

    }

  _FPU_GETFPSR (fpsr);

  fpcr_new = fpcr & _FPU_RESERVED;

  fpsr_new = fpsr & _FPU_FPSR_RESERVED;

  if (envp == FE_DFL_ENV)

    {

      fpcr_new |= _FPU_DEFAULT;

      fpsr_new |= _FPU_FPSR_DEFAULT;

    }

  else

    {

      fpcr_new |= _FPU_FPCR_IEEE;

      fpsr_new |= _FPU_FPSR_IEEE;

    }

  _FPU_SETFPSR (fpsr_new);

  if (fpcr != fpcr_new)

    {

      _FPU_SETCW (fpcr_new);

      /* Trapping exceptions are optional in AArch64; the relevant enable

	 bits in FPCR are RES0 hence the absence of support can be detected

	 by reading back the FPCR and comparing with the required value.  */

      _FPU_GETCW (updated_fpcr);

      return fpcr_new & ~updated_fpcr;

    }

  return 0;

}

libm_hidden_def (__fesetenv)

weak_alias (__fesetenv, fesetenv)

libm_hidden_weak (fesetenv)