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/* 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
};
#define FPC_EXCEPTION_MASK_SHIFT 24
#define FPC_FLAGS_SHIFT 16
#define FPC_DXC_SHIFT 8
#define FPC_NOT_FPU_EXCEPTION 0x300
/* 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
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