Differential D26292 Diff 93615 sys/x86/include/x86_ieeefp.h

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sys/x86/include/x86_ieeefp.h

This file was copied from sys/i386/include/ieeefp.h.

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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY		* 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		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.		* SUCH DAMAGE.
*		*
* from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93		* from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93
* $FreeBSD$		* $FreeBSD$
*/		*/

#ifndef _MACHINE_IEEEFP_H_		#ifndef _X86_X86_IEEEFP_H_
#define _MACHINE_IEEEFP_H_		#define _X86_X86_IEEEFP_H_

		/* Deprecated historical FPU control interface */

/*		/*
* Deprecated historical FPU control interface
*
* IEEE floating point type, constant and function definitions.		* IEEE floating point type, constant and function definitions.
* XXX: FPFLD and FPOFF are undocumented pollution.		* XXX: {FP,SSE}FLD and {FP,SSE}OFF are undocumented pollution.
*/		*/

#ifndef _SYS_CDEFS_H_		#ifndef _SYS_CDEFS_H_
#error this file needs sys/cdefs.h as a prerequisite		#error this file needs sys/cdefs.h as a prerequisite
#endif		#endif

/*		/*
* Rounding modes.		* Rounding modes.
▲ Show 20 Lines • Show All 86 Lines • ▼ Show 20 Lines	if (((_sw & ~_cw) & FP_STKY_FLD) != 0) {
_env._cw = _newcw;		_env._cw = _newcw;
__fldenv(&_env);		__fldenv(&_env);
return;		return;
}		}
}		}
__fldcw(&_newcw);		__fldcw(&_newcw);
}		}

static __inline fp_rnd_t
fpgetround(void)
{
unsigned short _cw;

__fnstcw(&_cw);
return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF));
}

static __inline fp_rnd_t
fpsetround(fp_rnd_t _m)
{
fp_rnd_t _p;
unsigned short _cw, _newcw;

__fnstcw(&_cw);
_p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF);
_newcw = _cw & ~FP_RND_FLD;
_newcw \|= (_m << FP_RND_OFF) & FP_RND_FLD;
__fnldcw(_cw, _newcw);
return (_p);
}

static __inline fp_prec_t
fpgetprec(void)
{
unsigned short _cw;

__fnstcw(&_cw);
return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF));
}

static __inline fp_prec_t
fpsetprec(fp_prec_t _m)
{
fp_prec_t _p;
unsigned short _cw, _newcw;

__fnstcw(&_cw);
_p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
_newcw = _cw & ~FP_PRC_FLD;
_newcw \|= (_m << FP_PRC_OFF) & FP_PRC_FLD;
__fnldcw(_cw, _newcw);
return (_p);
}

/*
* Get or set the exception mask.
* Note that the x87 mask bits are inverted by the API -- a mask bit of 1
* means disable for x87 and SSE, but for fp*mask() it means enable.
*/

static __inline fp_except_t
fpgetmask(void)
{
unsigned short _cw;

__fnstcw(&_cw);
return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF);
}

static __inline fp_except_t
fpsetmask(fp_except_t _m)
{
fp_except_t _p;
unsigned short _cw, _newcw;

__fnstcw(&_cw);
_p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF;
_newcw = _cw & ~FP_MSKS_FLD;
_newcw \|= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD;
__fnldcw(_cw, _newcw);
return (_p);
}

static __inline fp_except_t
fpgetsticky(void)
{
unsigned _ex;
unsigned short _sw;

__fnstsw(&_sw);
_ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
return ((fp_except_t)_ex);
}

static __inline fp_except_t
fpresetsticky(fp_except_t _m)
{
struct {
unsigned _cw;
unsigned _sw;
unsigned _other[5];
} _env;
fp_except_t _p;

_m &= FP_STKY_FLD >> FP_STKY_OFF;
_p = fpgetsticky();
if ((_p & ~_m) == _p)
return (_p);
if ((_p & ~_m) == 0) {
__fnclex();
return (_p);
}
__fnstenv(&_env);
_env._sw &= ~_m;
__fldenv(&_env);
return (_p);
}

#endif /* __GNUCLIKE_ASM */		#endif /* __GNUCLIKE_ASM */

#endif /* !_MACHINE_IEEEFP_H_ */		#endif/* _X86_X86_IEEEFP_H_ */