1/* $OpenBSD: fenv.h,v 1.4 2011/05/25 21:46:49 martynas Exp $ */
2/* $NetBSD: fenv.h,v 1.1.2.2 2011/02/08 16:19:41 bouyer Exp $ */
3
4/*-
5 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32#ifndef _SPARC64_FENV_H_
33#define _SPARC64_FENV_H_
34
35/*
36 * Each symbol representing a floating point exception expands to an integer
37 * constant expression with values, such that bitwise-inclusive ORs of _all
38 * combinations_ of the constants result in distinct values.
39 *
40 * We use such values that allow direct bitwise operations on FPU registers.
41 */
42#define FE_INEXACT 0x020
43#define FE_DIVBYZERO 0x040
44#define FE_UNDERFLOW 0x080
45#define FE_OVERFLOW 0x100
46#define FE_INVALID 0x200
47
48/*
49 * The following symbol is simply the bitwise-inclusive OR of all floating-point
50 * exception constants defined above.
51 */
52#define FE_ALL_EXCEPT (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | \
53 FE_OVERFLOW | FE_INVALID)
54#define _MASK_SHIFT 18
55
56/*
57 * Each symbol representing the rounding direction, expands to an integer
58 * constant expression whose value is distinct non-negative value.
59 *
60 * We use such values that allow direct bitwise operations on FPU registers.
61 */
62#define FE_TONEAREST 0x0
63#define FE_TOWARDZERO 0x1
64#define FE_UPWARD 0x2
65#define FE_DOWNWARD 0x3
66
67/*
68 * The following symbol is simply the bitwise-inclusive OR of all floating-point
69 * rounding direction constants defined above.
70 */
71#define _ROUND_MASK (FE_TONEAREST | FE_TOWARDZERO | FE_UPWARD | \
72 FE_DOWNWARD)
73#define _ROUND_SHIFT 30
74
75/*
76 * fenv_t represents the entire floating-point environment.
77 */
78typedef unsigned long fenv_t;
79
80/*
81 * The following constant represents the default floating-point environment
82 * (that is, the one installed at program startup) and has type pointer to
83 * const-qualified fenv_t.
84 *
85 * It can be used as an argument to the functions within the <fenv.h> header
86 * that manage the floating-point environment, namely fesetenv() and
87 * feupdateenv().
88 */
89__BEGIN_DECLS
90extern fenv_t __fe_dfl_env;
91__END_DECLS
92#define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env)
93
94/*
95 * fexcept_t represents the floating-point status flags collectively, including
96 * any status the implementation associates with the flags.
97 *
98 * A floating-point status flag is a system variable whose value is set (but
99 * never cleared) when a floating-point exception is raised, which occurs as a
100 * side effect of exceptional floating-point arithmetic to provide auxiliary
101 * information.
102 *
103 * A floating-point control mode is a system variable whose value may be set by
104 * the user to affect the subsequent behavior of floating-point arithmetic.
105 */
106typedef unsigned long fexcept_t;
107
108#endif /* !_SPARC64_FENV_H_ */