1/*	$OpenBSD: fenv.h,v 1.3 2011/05/25 21:46:49 martynas Exp $	*/
2
3/*
4 * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef	_HPPA_FENV_H_
20#define	_HPPA_FENV_H_
21
22/*
23 * Each symbol representing a floating point exception expands to an integer
24 * constant expression with values, such that bitwise-inclusive ORs of _all
25 * combinations_ of the constants result in distinct values.
26 *
27 * We use such values that allow direct bitwise operations on FPU registers.
28 */
29#define	FE_INEXACT		0x01
30#define	FE_UNDERFLOW		0x02
31#define	FE_OVERFLOW		0x04
32#define	FE_DIVBYZERO		0x08
33#define	FE_INVALID		0x10
34
35/*
36 * The following symbol is simply the bitwise-inclusive OR of all floating-point
37 * exception constants defined above.
38 */
39#define	FE_ALL_EXCEPT		(FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | \
40				 FE_DIVBYZERO | FE_INVALID)
41#define	_MASK_SHIFT		27
42
43/*
44 * Each symbol representing the rounding direction, expands to an integer
45 * constant expression whose value is distinct non-negative value.
46 *
47 * We use such values that allow direct bitwise operations on FPU registers.
48 */
49#define	FE_TONEAREST		0x000
50#define	FE_TOWARDZERO		0x200
51#define	FE_UPWARD		0x400
52#define	FE_DOWNWARD		0x600
53
54/*
55 * The following symbol is simply the bitwise-inclusive OR of all floating-point
56 * rounding direction constants defined above.
57 */
58#define	_ROUND_MASK		(FE_TONEAREST | FE_TOWARDZERO | FE_UPWARD | \
59				 FE_DOWNWARD)
60
61/*
62 * fenv_t represents the entire floating-point environment.
63 */
64typedef	unsigned int		fenv_t;
65
66/*
67 * The following constant represents the default floating-point environment
68 * (that is, the one installed at program startup) and has type pointer to
69 * const-qualified fenv_t.
70 *
71 * It can be used as an argument to the functions within the <fenv.h> header
72 * that manage the floating-point environment, namely fesetenv() and
73 * feupdateenv().
74 */
75__BEGIN_DECLS
76extern	fenv_t			__fe_dfl_env;
77__END_DECLS
78#define	FE_DFL_ENV		((const fenv_t *)&__fe_dfl_env)
79
80/*
81 * fexcept_t represents the floating-point status flags collectively, including
82 * any status the implementation associates with the flags.
83 *
84 * A floating-point status flag is a system variable whose value is set (but
85 * never cleared) when a floating-point exception is raised, which occurs as a
86 * side effect of exceptional floating-point arithmetic to provide auxiliary
87 * information.
88 *
89 * A floating-point control mode is a system variable whose value may be set by
90 * the user to affect the subsequent behavior of floating-point arithmetic.
91 */
92typedef	unsigned int		fexcept_t;
93
94#endif	/* !_HPPA_FENV_H_ */
95