1/*-
2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/lib/msun/i387/fenv.h,v 1.4 2005/03/17 22:21:46 das Exp $
27 */
28
29#ifndef	_FENV_H_
30#define	_FENV_H_
31
32#include <sys/cdefs.h>
33#include <sys/_types.h>
34
35/*
36 * To preserve binary compatibility with FreeBSD 5.3, we pack the
37 * mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
38 */
39typedef struct {
40	__uint16_t	__control;
41	__uint16_t      __mxcsr_hi;
42	__uint16_t	__status;
43	__uint16_t      __mxcsr_lo;
44	__uint32_t	__tag;
45	char		__other[16];
46} fenv_t;
47
48typedef	__uint16_t	fexcept_t;
49
50/* Exception flags */
51#define	FE_INVALID	0x01
52#define	FE_DENORMAL	0x02
53#define	FE_DIVBYZERO	0x04
54#define	FE_OVERFLOW	0x08
55#define	FE_UNDERFLOW	0x10
56#define	FE_INEXACT	0x20
57#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
58			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
59
60/* Rounding modes */
61#define	FE_TONEAREST	0x0000
62#define	FE_DOWNWARD	0x0400
63#define	FE_UPWARD	0x0800
64#define	FE_TOWARDZERO	0x0c00
65#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
66			 FE_UPWARD | FE_TOWARDZERO)
67
68__BEGIN_DECLS
69
70/* Default floating-point environment */
71extern const fenv_t	__fe_dfl_env;
72#define	FE_DFL_ENV	(&__fe_dfl_env)
73
74/* C99 floating-point exception functions */
75int feclearexcept(int excepts);
76int fegetexceptflag(fexcept_t *flagp, int excepts);
77int fesetexceptflag(const fexcept_t *flagp, int excepts);
78/* feraiseexcept does not set the inexact flag on overflow/underflow */
79int feraiseexcept(int excepts);
80int fetestexcept(int excepts);
81
82/* C99 rounding control functions */
83int fegetround(void);
84int fesetround(int round);
85
86/* C99 floating-point environment functions */
87int fegetenv(fenv_t *__envp);
88int feholdexcept(fenv_t *__envp);
89int fesetenv(const fenv_t *envp);
90int feupdateenv(const fenv_t *__envp);
91
92#if __BSD_VISIBLE
93/* Additional support functions to set/query floating point traps */
94int feenableexcept(int __mask);
95int fedisableexcept(int __mask);
96int fegetexcept(void);
97
98#endif /* __BSD_VISIBLE */
99
100__END_DECLS
101
102#endif	/* !_FENV_H_ */
103