95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/* $OpenBSD: fenv.h,v 1.3 2019/03/12 22:14:50 patrick Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#ifndef _MACHINE_FENV_H_
|
|
#define _MACHINE_FENV_H_
|
|
|
|
/*
|
|
* Each symbol representing a floating point exception expands to an integer
|
|
* constant expression with values, such that bitwise-inclusive ORs of _all
|
|
* combinations_ of the constants result in distinct values.
|
|
*
|
|
* We use such values that allow direct bitwise operations on FPU registers.
|
|
*/
|
|
#define FE_INVALID 0x01
|
|
#define FE_DIVBYZERO 0x02
|
|
#define FE_OVERFLOW 0x04
|
|
#define FE_UNDERFLOW 0x08
|
|
#define FE_INEXACT 0x10
|
|
#define FE_DENORMAL 0x80
|
|
|
|
/*
|
|
* The following symbol is simply the bitwise-inclusive OR of all floating-point
|
|
* exception constants defined above.
|
|
*/
|
|
#define FE_ALL_EXCEPT (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | \
|
|
FE_UNDERFLOW | FE_INEXACT | FE_DENORMAL)
|
|
|
|
/*
|
|
* Each symbol representing the rounding direction, expands to an integer
|
|
* constant expression whose value is distinct non-negative value.
|
|
*
|
|
* We use such values that allow direct bitwise operations on FPU registers.
|
|
*/
|
|
#define FE_TONEAREST 0x0
|
|
#define FE_UPWARD 0x1
|
|
#define FE_DOWNWARD 0x2
|
|
#define FE_TOWARDZERO 0x3
|
|
|
|
/*
|
|
* The following symbol is simply the bitwise-inclusive OR of all floating-point
|
|
* rounding direction constants defined above.
|
|
*/
|
|
#define _ROUND_MASK (FE_TONEAREST | FE_UPWARD | FE_DOWNWARD | \
|
|
FE_TOWARDZERO)
|
|
#define _ROUND_SHIFT 22
|
|
|
|
/*
|
|
* fenv_t represents the entire floating-point environment.
|
|
*/
|
|
typedef unsigned long long fenv_t;
|
|
|
|
/*
|
|
* The following constant represents the default floating-point environment
|
|
* (that is, the one installed at program startup) and has type pointer to
|
|
* const-qualified fenv_t.
|
|
*
|
|
* It can be used as an argument to the functions within the <fenv.h> header
|
|
* that manage the floating-point environment, namely fesetenv() and
|
|
* feupdateenv().
|
|
*/
|
|
__BEGIN_DECLS
|
|
extern fenv_t __fe_dfl_env;
|
|
__END_DECLS
|
|
#define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env)
|
|
|
|
/*
|
|
* fexcept_t represents the floating-point status flags collectively, including
|
|
* any status the implementation associates with the flags.
|
|
*
|
|
* A floating-point status flag is a system variable whose value is set (but
|
|
* never cleared) when a floating-point exception is raised, which occurs as a
|
|
* side effect of exceptional floating-point arithmetic to provide auxiliary
|
|
* information.
|
|
*
|
|
* A floating-point control mode is a system variable whose value may be set by
|
|
* the user to affect the subsequent behavior of floating-point arithmetic.
|
|
*/
|
|
typedef unsigned long long fexcept_t;
|
|
|
|
#endif /* !_MACHINE_FENV_H_ */
|