185 lines
4.6 KiB
C
185 lines
4.6 KiB
C
/*-
|
|
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD: src/lib/msun/alpha/fenv.h,v 1.3 2005/03/16 19:03:44 das Exp $
|
|
*/
|
|
|
|
#ifndef _FENV_H_
|
|
#define _FENV_H_
|
|
|
|
#include <sys/_types.h>
|
|
|
|
typedef __uint64_t fenv_t;
|
|
typedef __uint16_t fexcept_t;
|
|
|
|
/* Exception flags */
|
|
#define FE_INVALID 0x02
|
|
#define FE_DIVBYZERO 0x04
|
|
#define FE_OVERFLOW 0x08
|
|
#define FE_UNDERFLOW 0x10
|
|
#define FE_INEXACT 0x20
|
|
#define FE_INTOVF 0x40 /* not maskable */
|
|
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INTOVF | \
|
|
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
|
|
|
|
/* Rounding modes */
|
|
#define FE_TOWARDZERO 0x00
|
|
#define FE_DOWNWARD 0x01
|
|
#define FE_TONEAREST 0x02
|
|
#define FE_UPWARD 0x03
|
|
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
|
|
FE_UPWARD | FE_TOWARDZERO)
|
|
#define _ROUND_SHIFT 58
|
|
|
|
#define _FPUSW_SHIFT 51
|
|
|
|
#define __excb() __asm __volatile("excb")
|
|
#define __mf_fpcr(__cw) __asm __volatile("mf_fpcr %0" : "=f" (*(__cw)))
|
|
#define __mt_fpcr(__cw) __asm __volatile("mt_fpcr %0" : : "f" (__cw))
|
|
|
|
union __fpcr {
|
|
double __d;
|
|
fenv_t __bits;
|
|
};
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* Default floating-point environment */
|
|
extern const fenv_t __fe_dfl_env;
|
|
#define FE_DFL_ENV (&__fe_dfl_env)
|
|
|
|
static __inline int
|
|
feclearexcept(int __excepts)
|
|
{
|
|
union __fpcr __r;
|
|
|
|
__excb();
|
|
__mf_fpcr(&__r.__d);
|
|
__r.__bits &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
|
|
__mt_fpcr(__r.__d);
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
fegetexceptflag(fexcept_t *__flagp, int __excepts)
|
|
{
|
|
union __fpcr __r;
|
|
|
|
__excb();
|
|
__mf_fpcr(&__r.__d);
|
|
__excb();
|
|
*__flagp = (__r.__bits >> _FPUSW_SHIFT) & __excepts;
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
|
|
{
|
|
union __fpcr __r;
|
|
fenv_t __xflag, __xexcepts;
|
|
|
|
__xflag = (fenv_t)*__flagp << _FPUSW_SHIFT;
|
|
__xexcepts = (fenv_t)__excepts << _FPUSW_SHIFT;
|
|
__excb();
|
|
__mf_fpcr(&__r.__d);
|
|
__r.__bits &= ~__xexcepts;
|
|
__r.__bits |= __xflag & __xexcepts;
|
|
__mt_fpcr(__r.__d);
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
feraiseexcept(int __excepts)
|
|
{
|
|
|
|
/*
|
|
* XXX Generating exceptions this way does not actually invoke
|
|
* a userland trap handler when enabled, but neither do
|
|
* arithmetic operations as far as I can tell. Perhaps there
|
|
* are more bugs in the kernel trap handler.
|
|
*/
|
|
fexcept_t __ex = __excepts;
|
|
fesetexceptflag(&__ex, __excepts);
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
fetestexcept(int __excepts)
|
|
{
|
|
union __fpcr __r;
|
|
|
|
__excb();
|
|
__mf_fpcr(&__r.__d);
|
|
__excb();
|
|
return ((__r.__bits >> _FPUSW_SHIFT) & __excepts);
|
|
}
|
|
|
|
static __inline int
|
|
fegetround(void)
|
|
{
|
|
union __fpcr __r;
|
|
|
|
/*
|
|
* No exception barriers should be required here if we assume
|
|
* that only fesetround() can change the rounding mode.
|
|
*/
|
|
__mf_fpcr(&__r.__d);
|
|
return ((int)(__r.__bits >> _ROUND_SHIFT) & _ROUND_MASK);
|
|
}
|
|
|
|
static __inline int
|
|
fesetround(int __round)
|
|
{
|
|
union __fpcr __r;
|
|
|
|
if (__round & ~_ROUND_MASK)
|
|
return (-1);
|
|
__excb();
|
|
__mf_fpcr(&__r.__d);
|
|
__r.__bits &= ~((fenv_t)_ROUND_MASK << _ROUND_SHIFT);
|
|
__r.__bits |= (fenv_t)__round << _ROUND_SHIFT;
|
|
__mt_fpcr(__r.__d);
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
int fegetenv(fenv_t *__envp);
|
|
int feholdexcept(fenv_t *__envp);
|
|
int fesetenv(const fenv_t *__envp);
|
|
int feupdateenv(const fenv_t *__envp);
|
|
|
|
#if __BSD_VISIBLE
|
|
|
|
int feenableexcept(int __mask);
|
|
int fedisableexcept(int __mask);
|
|
int fegetexcept(void);
|
|
|
|
#endif /* __BSD_VISIBLE */
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* !_FENV_H_ */
|