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Linux/HPPA specific fenv definitions.

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This commit is contained in:
Ulrich Drepper 2000-10-15 03:37:33 +00:00
parent 2db1ce26da
commit fb0f005337
1 changed files with 78 additions and 0 deletions
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sysdeps/hppa/fpu/bits/fenv.h Normal file
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/* Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Huggins-Daines <dhd@debian.org>
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 values of the
appropriate enable bits in the FPU status word (which,
coincidentally, are the same as the flag bits, but shifted right by
27 bits). */
enum
{
FE_INVALID = 1<<4, /* V */
#define FE_INVALID FE_INVALID
FE_DIVBYZERO = 1<<3, /* Z */
#define FE_DIVBYZERO FE_DIVBYZERO
FE_OVERFLOW = 1<<2, /* O */
#define FE_OVERFLOW FE_OVERFLOW
FE_UNDERFLOW = 1<<1, /* U */
#define FE_UNDERFLOW FE_UNDERFLOW
FE_INEXACT = 1<<0, /* I */
#define FE_INEXACT FE_INEXACT
};
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The PA-RISC FPU supports all of the four defined rounding modes.
We use the values of the RM field in the floating point status
register for the appropriate macros. */
enum
{
FE_TONEAREST = 0 << 9,
#define FE_TONEAREST FE_TONEAREST
FE_TOWARDZERO = 1 << 9,
#define FE_TOWARDZERO FE_TOWARDZERO
FE_UPWARD = 2 << 9,
#define FE_UPWARD FE_UPWARD
FE_DOWNWARD = 3 << 9,
#define FE_DOWNWARD FE_DOWNWARD
};
/* Type representing exception flags. */
typedef unsigned int fexcept_t;
/* Type representing floating-point environment. This structure
corresponds to the layout of the status and exception words in the
register file. */
typedef struct
{
unsigned int __status_word;
unsigned int __exception[7];
} fenv_t;
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((fenv_t *) -1)
#ifdef __USE_GNU
/* Floating-point environment where none of the exceptions are masked. */
# define FE_NOMASK_ENV ((fenv_t *) -2)
#endif