1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/* $OpenBSD: fenv.h,v 1.1 2020/06/28 08:19:34 kettenis 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_INEXACT 0x02000000
#define FE_DIVBYZERO 0x04000000
#define FE_UNDERFLOW 0x08000000
#define FE_OVERFLOW 0x10000000
#define FE_INVALID 0x20000000
#define _FE_INVALID_SOFT 0x00000400
#define _FE_INVALID_ALL 0x01f80700
/*
* The following symbol is simply the bitwise-inclusive OR of all floating-point
* exception constants defined above.
*/
#define FE_ALL_EXCEPT (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | \
FE_OVERFLOW | FE_INVALID)
#define _MASK_SHIFT 22
/*
* 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_TOWARDZERO 0x1
#define FE_UPWARD 0x2
#define FE_DOWNWARD 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_TOWARDZERO | FE_UPWARD | \
FE_DOWNWARD)
/*
* fenv_t represents the entire floating-point environment.
*/
typedef unsigned int 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 int fexcept_t;
#endif /* !_MACHINE_FENV_H_ */
|
