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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 __BEGIN_DECLS
36 
37 /*
38  * To preserve binary compatibility with FreeBSD 5.3, we pack the
39  * mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
40  */
41 typedef struct {
42 	__uint16_t	__control;
43 	__uint16_t      __mxcsr_hi;
44 	__uint16_t	__status;
45 	__uint16_t      __mxcsr_lo;
46 	__uint32_t	__tag;
47 	char		__other[16];
48 } fenv_t;
49 
50 typedef	__uint16_t	fexcept_t;
51 
52 /* Exception flags */
53 #define	FE_INVALID	0x01
54 #define	FE_DENORMAL	0x02
55 #define	FE_DIVBYZERO	0x04
56 #define	FE_OVERFLOW	0x08
57 #define	FE_UNDERFLOW	0x10
58 #define	FE_INEXACT	0x20
59 #define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
60 			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
61 
62 /* Rounding modes */
63 #define	FE_TONEAREST	0x0000
64 #define	FE_DOWNWARD	0x0400
65 #define	FE_UPWARD	0x0800
66 #define	FE_TOWARDZERO	0x0c00
67 #define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
68 			 FE_UPWARD | FE_TOWARDZERO)
69 
70 /* Default floating-point environment */
71 extern const fenv_t	__fe_dfl_env;
72 #define	FE_DFL_ENV	(&__fe_dfl_env)
73 
74 /* C99 floating-point exception functions */
75 int feclearexcept(int excepts);
76 int fegetexceptflag(fexcept_t *flagp, int excepts);
77 int fesetexceptflag(const fexcept_t *flagp, int excepts);
78 /* feraiseexcept does not set the inexact flag on overflow/underflow */
79 int feraiseexcept(int excepts);
80 int fetestexcept(int excepts);
81 
82 /* C99 rounding control functions */
83 int fegetround(void);
84 int fesetround(int round);
85 
86 /* C99 floating-point environment functions */
87 int fegetenv(fenv_t *__envp);
88 int feholdexcept(fenv_t *__envp);
89 int fesetenv(const fenv_t *envp);
90 int feupdateenv(const fenv_t *__envp);
91 
92 #if __BSD_VISIBLE
93 /* Additional support functions to set/query floating point traps */
94 int feenableexcept(int __mask);
95 int fedisableexcept(int __mask);
96 int fegetexcept(void);
97 
98 #endif /* __BSD_VISIBLE */
99 
100 __END_DECLS
101 
102 #endif	/* !_FENV_H_ */
103