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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*
* $FreeBSD$
*/
#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 */
#ifdef __mips_soft_float
#define _FPUSW_SHIFT 16
#define FE_INVALID 0x0001
#define FE_DIVBYZERO 0x0002
#define FE_OVERFLOW 0x0004
#define FE_UNDERFLOW 0x0008
#define FE_INEXACT 0x0010
#else
#define _FCSR_CAUSE_SHIFT 10
#define FE_INVALID 0x0040
#define FE_DIVBYZERO 0x0020
#define FE_OVERFLOW 0x0010
#define FE_UNDERFLOW 0x0008
#define FE_INEXACT 0x0004
#endif
#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)
__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_SHIFT 5
#define _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT)
#if !defined(__mips_soft_float) && !defined(__mips_hard_float)
#error compiler didnt set soft/hard float macros
#endif
#ifndef __mips_soft_float
#define __cfc1(__fcsr) __asm __volatile("cfc1 %0, $31" : "=r" (__fcsr))
#define __ctc1(__fcsr) __asm __volatile("ctc1 %0, $31" :: "r" (__fcsr))
#endif
#ifdef __mips_soft_float
int feclearexcept(int __excepts);
int fegetexceptflag(fexcept_t *__flagp, int __excepts);
int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
int feraiseexcept(int __excepts);
int fetestexcept(int __excepts);
int fegetround(void);
int fesetround(int __round);
int fegetenv(fenv_t *__envp);
int feholdexcept(fenv_t *__envp);
int fesetenv(const fenv_t *__envp);
int feupdateenv(const fenv_t *__envp);
#else
__fenv_static inline int
feclearexcept(int __excepts)
{
fexcept_t fcsr;
__excepts &= FE_ALL_EXCEPT;
__cfc1(fcsr);
fcsr &= ~(__excepts | (__excepts << _FCSR_CAUSE_SHIFT));
__ctc1(fcsr);
return (0);
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t fcsr;
__excepts &= FE_ALL_EXCEPT;
__cfc1(fcsr);
*__flagp = fcsr & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t fcsr;
__excepts &= FE_ALL_EXCEPT;
__cfc1(fcsr);
fcsr &= ~__excepts;
fcsr |= *__flagp & __excepts;
__ctc1(fcsr);
return (0);
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
fexcept_t fcsr;
__excepts &= FE_ALL_EXCEPT;
__cfc1(fcsr);
fcsr |= __excepts | (__excepts << _FCSR_CAUSE_SHIFT);
__ctc1(fcsr);
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fexcept_t fcsr;
__excepts &= FE_ALL_EXCEPT;
__cfc1(fcsr);
return (fcsr & __excepts);
}
__fenv_static inline int
fegetround(void)
{
fexcept_t fcsr;
__cfc1(fcsr);
return (fcsr & _ROUND_MASK);
}
__fenv_static inline int
fesetround(int __round)
{
fexcept_t fcsr;
if (__round & ~_ROUND_MASK)
return (-1);
__cfc1(fcsr);
fcsr &= ~_ROUND_MASK;
fcsr |= __round;
__ctc1(fcsr);
return (0);
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
__cfc1(*__envp);
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fexcept_t fcsr;
__cfc1(fcsr);
*__envp = fcsr;
fcsr &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
__ctc1(fcsr);
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
__ctc1(*__envp);
return (0);
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t fcsr;
__cfc1(fcsr);
fesetenv(__envp);
feraiseexcept(fcsr);
return (0);
}
#endif /* !__mips_soft_float */
#if __BSD_VISIBLE
/* We currently provide no external definitions of the functions below. */
#ifdef __mips_soft_float
int feenableexcept(int __mask);
int fedisableexcept(int __mask);
int fegetexcept(void);
#else
static inline int
feenableexcept(int __mask)
{
fenv_t __old_fcsr, __new_fcsr;
__cfc1(__old_fcsr);
__new_fcsr = __old_fcsr | (__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT;
__ctc1(__new_fcsr);
return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
}
static inline int
fedisableexcept(int __mask)
{
fenv_t __old_fcsr, __new_fcsr;
__cfc1(__old_fcsr);
__new_fcsr = __old_fcsr & ~((__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT);
__ctc1(__new_fcsr);
return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
}
static inline int
fegetexcept(void)
{
fexcept_t fcsr;
__cfc1(fcsr);
return ((fcsr & _ENABLE_MASK) >> _ENABLE_SHIFT);
}
#endif /* !__mips_soft_float */
#endif /* __BSD_VISIBLE */
__END_DECLS
#endif /* !_FENV_H_ */
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