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      1 /*-
      2  * Copyright (c) 2004-2005 David Schultz <das (at) 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  */
     39 typedef 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 
     48 typedef	__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 */
     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