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/* Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#ifndef _FENV_H

# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."

#endif

/* Define bits representing the exception.  We use the bit positions

   of the appropriate bits in the FPU control word.  */

enum

  {

    FE_INVALID = 0x01,

#define FE_INVALID      FE_INVALID

    __FE_DENORM = 0x02,

    FE_DIVBYZERO = 0x04,

#define FE_DIVBYZERO    FE_DIVBYZERO

    FE_OVERFLOW = 0x08,

#define FE_OVERFLOW     FE_OVERFLOW

    FE_UNDERFLOW = 0x10,

#define FE_UNDERFLOW    FE_UNDERFLOW

    FE_INEXACT = 0x20

#define FE_INEXACT      FE_INEXACT

  };

#define FE_ALL_EXCEPT \

        (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

/* The ix87 FPU supports all of the four defined rounding modes.  We

   use again the bit positions in the FPU control word as the values

   for the appropriate macros.  */

enum

  {

    FE_TONEAREST = 0,

#define FE_TONEAREST    FE_TONEAREST

    FE_DOWNWARD = 0x400,

#define FE_DOWNWARD     FE_DOWNWARD

    FE_UPWARD = 0x800,

#define FE_UPWARD       FE_UPWARD

    FE_TOWARDZERO = 0xc00

#define FE_TOWARDZERO   FE_TOWARDZERO

  };

/* Type representing exception flags.  */

typedef unsigned short int fexcept_t;

/* Type representing floating-point environment.  This function corresponds

   to the layout of the block written by the `fstenv'.  */

typedef struct

  {

    unsigned short int __control_word;

    unsigned short int __unused1;

    unsigned short int __status_word;

    unsigned short int __unused2;

    unsigned short int __tags;

    unsigned short int __unused3;

    unsigned int __eip;

    unsigned short int __cs_selector;

    unsigned int __opcode:11;

    unsigned int __unused4:5;

    unsigned int __data_offset;

    unsigned short int __data_selector;

    unsigned short int __unused5;

  }

fenv_t;

/* If the default argument is used we use this value.  */

#define FE_DFL_ENV      ((__const fenv_t *) -1)

#ifdef __USE_GNU

/* Floating-point environment where none of the exception is masked.  */

# define FE_NOMASK_ENV  ((__const fenv_t *) -2)

#endif