/* $NetBSD: fenv.h,v 1.7 2024/10/30 15:56:11 riastradh Exp $ */
/*-
* Copyright (c) 2004-2005 David Schultz <
[email protected]>
* 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: head/lib/msun/mips/fenv.h 226218 2011-10-10 15:43:09Z das $
*/
#ifndef _MIPS_FENV_H_
#define _MIPS_FENV_H_
#include <sys/featuretest.h>
#include <sys/stdint.h>
/* Exception flags */
#define FE_INEXACT 0x0004
#define FE_UNDERFLOW 0x0008
#define FE_OVERFLOW 0x0010
#define FE_DIVBYZERO 0x0020
#define FE_INVALID 0x0040
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
FE_INVALID | 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)
#ifndef __mips_soft_float
#ifndef __fenv_static
#define __fenv_static static
#endif
typedef uint32_t fpu_control_t __attribute__((__mode__(__SI__)));
typedef fpu_control_t fenv_t;
typedef fpu_control_t fexcept_t;
__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 _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT)
#define _ENABLE_SHIFT 5
static inline fpu_control_t
__rfs(void)
{
fpu_control_t __fpsr;
__asm __volatile("cfc1 %0,$31" : "=r" (__fpsr));
return __fpsr;
}
static inline void
__wfs(fpu_control_t __fpsr)
{
__asm __volatile("ctc1 %0,$31" : : "r" (__fpsr));
}
#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif
__fenv_static inline int
feclearexcept(int __excepts)
{
fexcept_t __fpsr;
__excepts &= FE_ALL_EXCEPT;
__fpsr = __rfs();
__fpsr &= ~(__excepts | (__excepts << _ENABLE_SHIFT));
__wfs(__fpsr);
return 0;
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__fpsr = __rfs();
*__flagp = __fpsr & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__fpsr = __rfs();
__fpsr &= ~__excepts;
__fpsr |= *__flagp & __excepts;
__wfs(__fpsr);
return (0);
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
fexcept_t __ex = __excepts;
fesetexceptflag(&__ex, __excepts); /* XXX */
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fexcept_t __fpsr;
__fpsr = __rfs();
return (__fpsr & __excepts);
}
__fenv_static inline int
fegetround(void)
{
fexcept_t __fpsr;
__fpsr = __rfs();
return __fpsr & _ROUND_MASK;
}
__fenv_static inline int
fesetround(int __round)
{
fexcept_t __fpsr;
if (__round & ~_ROUND_MASK)
return 1;
__fpsr = __rfs();
__fpsr &= ~_ROUND_MASK;
__fpsr |= __round;
__wfs(__fpsr);
return 0;
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
*__envp = __rfs();
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fenv_t __env;
__env = __rfs();
*__envp = __env;
__env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
__wfs(__env);
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
__wfs(*__envp);
return (0);
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t __fpsr;
__fpsr = __rfs();
__wfs(*__envp);
feraiseexcept(__fpsr & FE_ALL_EXCEPT);
return (0);
}
#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic pop
#endif
#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
__fenv_static inline int
feenableexcept(int __excepts)
{
fenv_t __old_fpsr, __new_fpsr;
__new_fpsr = __rfs();
__old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT;
__excepts &= FE_ALL_EXCEPT;
__new_fpsr |= __excepts << _ENABLE_SHIFT;
__wfs(__new_fpsr);
return __old_fpsr;
}
__fenv_static inline int
fedisableexcept(int __excepts)
{
fenv_t __old_fpsr, __new_fpsr;
__new_fpsr = __rfs();
__old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT;
__excepts &= FE_ALL_EXCEPT;
__new_fpsr &= ~(__excepts << _ENABLE_SHIFT);
__wfs(__new_fpsr);
return __old_fpsr;
}
__fenv_static inline int
fegetexcept(void)
{
fenv_t __fpsr;
__fpsr = __rfs();
return ((__fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT);
}
#endif /* _NETBSD_SOURCE || _GNU_SOURCE */
__END_DECLS
#endif /* __mips_soft_float */
#endif /* !_FENV_H_ */
