source: svn/trunk/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/bits/fenv.h

/* Copyright (C) 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_INEXACT = 0x04,
#define FE_INEXACT      FE_INEXACT
    FE_UNDERFLOW = 0x08,
#define FE_UNDERFLOW    FE_UNDERFLOW
    FE_OVERFLOW = 0x10,
#define FE_OVERFLOW     FE_OVERFLOW
    FE_DIVBYZERO = 0x20,
#define FE_DIVBYZERO    FE_DIVBYZERO
    FE_INVALID = 0x40,
#define FE_INVALID      FE_INVALID
  };

#define FE_ALL_EXCEPT \
        (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

/* The MIPS 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 = 0x0,
#define FE_TONEAREST    FE_TONEAREST
    FE_TOWARDZERO = 0x1,
#define FE_TOWARDZERO   FE_TOWARDZERO
    FE_UPWARD = 0x2,
#define FE_UPWARD       FE_UPWARD
    FE_DOWNWARD = 0x3
#define FE_DOWNWARD     FE_DOWNWARD
  };


/* 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 int __fp_control_register;
  }
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