84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/* Copyright (C) 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
|
|
|
|
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 FPU control word. */
|
|
enum
|
|
{
|
|
FE_INVALID = 0x80,
|
|
#define FE_INVALID FE_INVALID
|
|
FE_DIVBYZERO = 0x40,
|
|
#define FE_DIVBYZERO FE_DIVBYZERO
|
|
FE_OVERFLOW = 0x20,
|
|
#define FE_OVERFLOW FE_OVERFLOW
|
|
FE_UNDERFLOW = 0x10,
|
|
#define FE_UNDERFLOW FE_UNDERFLOW
|
|
FE_INEXACT = 0x08
|
|
#define FE_INEXACT FE_INEXACT
|
|
};
|
|
/* We dont use the y bit of the DXC in the floating point control register
|
|
* as glibc has no FE encoding for fe inexact incremented
|
|
* or fe inexact truncated.
|
|
* We currently use the flag bits in the fpc
|
|
* as these are sticky for feholdenv & feupdatenv as it is defined
|
|
* in the HP Manpages.
|
|
*/
|
|
|
|
|
|
#define FE_ALL_EXCEPT \
|
|
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
|
|
|
|
enum
|
|
{
|
|
FE_TONEAREST = 0,
|
|
#define FE_TONEAREST FE_TONEAREST
|
|
FE_DOWNWARD = 0x3,
|
|
#define FE_DOWNWARD FE_DOWNWARD
|
|
FE_UPWARD = 0x2,
|
|
#define FE_UPWARD FE_UPWARD
|
|
FE_TOWARDZERO = 0x1
|
|
#define FE_TOWARDZERO FE_TOWARDZERO
|
|
};
|
|
|
|
|
|
/* Type representing exception flags. */
|
|
typedef unsigned int fexcept_t; /* size of fpc */
|
|
|
|
|
|
/* Type representing floating-point environment. This function corresponds
|
|
to the layout of the block written by the `fstenv'. */
|
|
typedef struct
|
|
{
|
|
fexcept_t fpc;
|
|
void *ieee_instruction_pointer;
|
|
/* failing instruction for ieee exceptions */
|
|
} 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
|