/* Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  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 FPSCR...  */
enum
  {
    FE_INEXACT = 1 << 31-6,
#define FE_INEXACT	FE_INEXACT
    FE_DIVBYZERO = 1 << 31-5,
#define FE_DIVBYZERO	FE_DIVBYZERO
    FE_UNDERFLOW = 1 << 31-4,
#define FE_UNDERFLOW	FE_UNDERFLOW
    FE_OVERFLOW = 1 << 31-3,
#define FE_OVERFLOW	FE_OVERFLOW

    /* ... except for FE_INVALID, for which we use bit 31. FE_INVALID
       actually corresponds to bits 7 through 12 and 21 through 23
       in the FPSCR, but we can't use that because the current draft
       says that it must be a power of 2.  Instead we use bit 24 which
       is the enable bit for all the FE_INVALID exceptions.  */
    FE_INVALID = 1 << 31-24,
#define FE_INVALID	FE_INVALID

#ifdef __USE_GNU
    /* Breakdown of the FE_INVALID bits. Setting FE_INVALID on an
       input to a routine is equivalent to setting all of these bits;
       FE_INVALID will be set on output from a routine iff one of
       these bits is set.  Note, though, that you can't disable or
       enable these exceptions individually.  */

    /* Operation with SNaN. */
    FE_INVALID_SNAN = 1 << 31-7,
#define FE_INVALID_SNAN	FE_INVALID_SNAN

    /* Inf - Inf */
    FE_INVALID_ISI = 1 << 31-8,
#define FE_INVALID_ISI	FE_INVALID_ISI

    /* Inf / Inf */
    FE_INVALID_IDI = 1 << 31-9,
#define FE_INVALID_IDI	FE_INVALID_IDI

    /* 0 / 0 */
    FE_INVALID_ZDZ = 1 << 31-10,
#define FE_INVALID_ZDZ	FE_INVALID_ZDZ

    /* Inf * 0 */
    FE_INVALID_IMZ = 1 << 31-11,
#define FE_INVALID_IMZ	FE_INVALID_IMZ

    /* Comparison with NaN or SNaN. */
    FE_INVALID_COMPARE = 1 << 31-12,
#define FE_INVALID_COMPARE	FE_INVALID_COMPARE

    /* Invalid operation flag for software (not set by hardware). */
    FE_INVALID_SOFTWARE = 1 << 31-21,
#define FE_INVALID_SOFTWARE	FE_INVALID_SOFTWARE

    /* Square root of negative number (including -Inf). */
    FE_INVALID_SQRT = 1 << 31-22,
#define FE_INVALID_SQRT	FE_INVALID_SQRT

    /* Conversion-to-integer of a NaN or a number too large or too small. */
    FE_INVALID_INTEGER_CONVERSION = 1 << 31-23,
#define FE_INVALID_INTEGER_CONVERSION	FE_INVALID_INTEGER_CONVERSION

#define FE_ALL_INVALID \
        (FE_INVALID_SNAN | FE_INVALID_ISI | FE_INVALID_IDI | FE_INVALID_ZDZ \
	 | FE_INVALID_IMZ | FE_INVALID_COMPARE | FE_INVALID_SOFTWARE \
	 | FE_INVALID_SQRT | FE_INVALID_INTEGER_CONVERSION)
#endif
  };

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

/* PowerPC chips support all of the four defined rounding modes.  We
   use the bit pattern in the FPSCR as the values for the
   appropriate macros.  */
enum
  {
    FE_TONEAREST = 0,
#define FE_TONEAREST	FE_TONEAREST
    FE_TOWARDSZERO = 1,
#define FE_TOWARDSZERO	FE_TOWARDSZERO
    FE_UPWARD = 2,
#define FE_UPWARD	FE_UPWARD
    FE_DOWNWARD = 3,
#define FE_DOWNWARD	FE_DOWNWARD
  };

/* Type representing exception flags.  */
typedef unsigned int fexcept_t;

/* Type representing floating-point environment.  We leave it as 'double'
   for efficiency reasons (rather than writing it to a 32-bit integer). */
typedef double fenv_t;

/* If the default argument is used we use this value.  */
extern const fenv_t __fe_dfl_env;
#define FE_DFL_ENV	(&__fe_dfl_env);

#ifdef __USE_GNU
/* Floating-point environment where none of the exceptions are masked.  */
extern const fenv_t __fe_nomask_env;
# define FE_NOMASK_ENV	(&__fe_nomask_env);
#endif