openlibm_fenv_s390.h

Go to the documentation of this file.

/*-
 * 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_ */