/* $OpenBSD: fenv.h,v 1.3 2011/05/25 21:46:49 martynas Exp $ */
/*
* Copyright (c) 2011 Martynas Venckus
*
* 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 _ALPHA_FENV_H_
#define _ALPHA_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
/*
* 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)
/*
* 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_TOWARDZERO 0x0
#define FE_DOWNWARD 0x1
#define FE_TONEAREST 0x2
#define FE_UPWARD 0x3
/*
* The following symbol is simply the bitwise-inclusive OR of all floating-point
* rounding direction constants defined above.
*/
#define _ROUND_MASK (FE_TOWARDZERO | FE_DOWNWARD | FE_TONEAREST | \
FE_UPWARD)
#define _ROUND_SHIFT 58
/*
* fenv_t represents the entire floating-point environment.
*/
typedef struct {
unsigned int __sticky;
unsigned int __mask;
unsigned int __round;
} 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 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 int fexcept_t;
#endif /* !_ALPHA_FENV_H_ */