/* Determine floating-point rounding mode within libc.  Generic version.

   Copyright (C) 2012-2018 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/>.  */

#ifndef _GET_ROUNDING_MODE_H

#define _GET_ROUNDING_MODE_H	1

#include <fpu_control.h>

#include <stdlib.h>

/* Define values for FE_* modes not defined for this architecture.  */

#ifdef FE_DOWNWARD

# define ORIG_FE_DOWNWARD FE_DOWNWARD

#else

# define ORIG_FE_DOWNWARD 0

#endif

#ifdef FE_TONEAREST

# define ORIG_FE_TONEAREST FE_TONEAREST

#else

# define ORIG_FE_TONEAREST 0

#endif

#ifdef FE_TOWARDZERO

# define ORIG_FE_TOWARDZERO FE_TOWARDZERO

#else

# define ORIG_FE_TOWARDZERO 0

#endif

#ifdef FE_UPWARD

# define ORIG_FE_UPWARD FE_UPWARD

#else

# define ORIG_FE_UPWARD 0

#endif

#define FE_CONSTRUCT_DISTINCT_VALUE(X, Y, Z) \

  ((((X) & 1) | ((Y) & 2) | ((Z) & 4)) ^ 7)

#ifndef FE_DOWNWARD

# define FE_DOWNWARD FE_CONSTRUCT_DISTINCT_VALUE (ORIG_FE_TONEAREST,	\

						  ORIG_FE_TOWARDZERO,	\

						  ORIG_FE_UPWARD)

#endif

#ifndef FE_TONEAREST

# define FE_TONEAREST FE_CONSTRUCT_DISTINCT_VALUE (FE_DOWNWARD,		\

						   ORIG_FE_TOWARDZERO,	\

						   ORIG_FE_UPWARD)

#endif

#ifndef FE_TOWARDZERO

# define FE_TOWARDZERO FE_CONSTRUCT_DISTINCT_VALUE (FE_DOWNWARD,	\

						    FE_TONEAREST,	\

						    ORIG_FE_UPWARD)

#endif

#ifndef FE_UPWARD

# define FE_UPWARD FE_CONSTRUCT_DISTINCT_VALUE (FE_DOWNWARD,	\

						FE_TONEAREST,	\

						FE_TOWARDZERO)

#endif

/* Return the floating-point rounding mode.  */

static inline int

get_rounding_mode (void)

{

#if (defined _FPU_RC_DOWN			\

     || defined _FPU_RC_NEAREST			\

     || defined _FPU_RC_ZERO			\

     || defined _FPU_RC_UP)

  fpu_control_t fc;

  const fpu_control_t mask = (0

# ifdef _FPU_RC_DOWN

			      | _FPU_RC_DOWN

# endif

# ifdef _FPU_RC_NEAREST

			      | _FPU_RC_NEAREST

# endif

# ifdef _FPU_RC_ZERO

			      | _FPU_RC_ZERO

# endif

# ifdef _FPU_RC_UP

			      | _FPU_RC_UP

# endif

			      );

  _FPU_GETCW (fc);

  switch (fc & mask)

    {

# ifdef _FPU_RC_DOWN

    case _FPU_RC_DOWN:

      return FE_DOWNWARD;

# endif

# ifdef _FPU_RC_NEAREST

    case _FPU_RC_NEAREST:

      return FE_TONEAREST;

# endif

# ifdef _FPU_RC_ZERO

    case _FPU_RC_ZERO:

      return FE_TOWARDZERO;

# endif

# ifdef _FPU_RC_UP

    case _FPU_RC_UP:

      return FE_UPWARD;

# endif

    default:

      abort ();

    }

#else

  return FE_TONEAREST;

#endif

}

#endif /* get-rounding-mode.h */