OpenLibm/include/openlibm_fenv_s390.h

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2016-09-05 14:14:14 +02:00
/*-
* Copyright (c) 2016 Dan Horák <dan[at]danny.cz>
* 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.
*
* $FreeBSD$
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <sys/types.h>
#ifndef __fenv_static
#define __fenv_static static
#endif
typedef __uint32_t fenv_t;
typedef __uint32_t fexcept_t;
/* Exception flags */
#define FE_INEXACT 0x080000
#define FE_UNDERFLOW 0x100000
#define FE_OVERFLOW 0x200000
#define FE_DIVBYZERO 0x400000
#define FE_INVALID 0x800000 /* all types of invalid FP ops */
#define FE_ALL_EXCEPT (FE_INVALID | FE_DIVBYZERO | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW)
/* Rounding modes */
#define FE_TONEAREST 0x0000
#define FE_TOWARDZERO 0x0001
#define FE_UPWARD 0x0002
#define FE_DOWNWARD 0x0003
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
FE_UPWARD | FE_TOWARDZERO)
__BEGIN_DECLS
/* Default floating-point environment */
extern const fenv_t __fe_dfl_env;
#define FE_DFL_ENV (&__fe_dfl_env)
/* We need to be able to map status flag positions to mask flag positions */
#define _FPC_EXC_MASK_SHIFT 8
#define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
FE_OVERFLOW | FE_UNDERFLOW) << _FPC_EXC_MASK_SHIFT)
/* Macros for accessing the hardware control word. */
#define _FPU_GETCW(cw) __asm__ __volatile__ ("efpc %0,0" : "=d" (cw))
#define _FPU_SETCW(cw) __asm__ __volatile__ ("sfpc %0,0" : : "d" (cw))
__fenv_static inline int
feclearexcept(int __excepts)
{
fexcept_t __r;
if (__excepts & FE_INVALID)
__excepts |= FE_ALL_EXCEPT;
_FPU_GETCW(__r);
__r &= ~__excepts;
_FPU_SETCW(__r);
return (0);
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __r;
_FPU_GETCW(__r);
*__flagp = __r & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t __r;
if (__excepts & FE_INVALID)
__excepts |= FE_ALL_EXCEPT;
_FPU_GETCW(__r);
__r &= ~__excepts;
__r |= *__flagp & __excepts;
_FPU_SETCW(__r);
return (0);
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
fexcept_t __r;
_FPU_GETCW(__r);
__r |= __excepts;
_FPU_SETCW(__r);
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fexcept_t __r;
_FPU_GETCW(__r);
return (__r & __excepts);
}
__fenv_static inline int
fegetround(void)
{
fexcept_t __r;
_FPU_GETCW(__r);
return (__r & _ROUND_MASK);
}
__fenv_static inline int
fesetround(int __round)
{
fexcept_t __r;
if (__round & ~_ROUND_MASK)
return (-1);
_FPU_GETCW(__r);
__r &= ~_ROUND_MASK;
__r |= __round;
_FPU_SETCW(__r);
return (0);
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
_FPU_GETCW(*__envp);
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fexcept_t __r;
_FPU_GETCW(__r);
*__envp = __r;
__r &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
_FPU_SETCW(__r);
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
_FPU_SETCW(*__envp);
return (0);
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t __r;
_FPU_GETCW(__r);
__r &= FE_ALL_EXCEPT;
__r |= *__envp;
_FPU_SETCW(__r);
return (0);
}
#if __BSD_VISIBLE
/* We currently provide no external definitions of the functions below. */
static inline int
feenableexcept(int __mask)
{
fenv_t __r;
fenv_t __oldmask;
_FPU_GETCW(__r);
__oldmask = __r;
__r |= (__mask & FE_ALL_EXCEPT) << _FPC_EXC_MASK_SHIFT;
_FPU_SETCW(__r);
return ((__oldmask & _ENABLE_MASK) >> _FPC_EXC_MASK_SHIFT);
}
static inline int
fedisableexcept(int __mask)
{
fenv_t __r;
fenv_t __oldmask;
_FPU_GETCW(__r);
__oldmask = __r;
__r &= ~((__mask & FE_ALL_EXCEPT) << _FPC_EXC_MASK_SHIFT);
_FPU_SETCW(__r);
return ((__oldmask & _ENABLE_MASK) >> _FPC_EXC_MASK_SHIFT);
}
static inline int
fegetexcept(void)
{
fexcept_t __r;
_FPU_GETCW(__r);
return (__r & (_ENABLE_MASK >> _FPC_EXC_MASK_SHIFT));
}
#endif /* __BSD_VISIBLE */
__END_DECLS
#endif /* !_FENV_H_ */