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/*-
* Copyright (c) 2004-2011 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_
#error "This file is meant to be included only by <fenv.h>."
#endif
/*
* This file implements the functionality of <fenv.h> on platforms that
* lack an FPU and use softfloat in libc for floating point. To use it,
* you must write an <fenv.h> that provides the following:
*
* - a typedef for fenv_t, which may be an integer or struct type
* - a typedef for fexcept_t (XXX This file assumes fexcept_t is a
* simple integer type containing the exception mask.)
* - definitions of FE_* constants for the five exceptions and four
* rounding modes in IEEE 754, as described in fenv(3)
* - a definition, and the corresponding external symbol, for FE_DFL_ENV
* - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t
* from the exception flags, mask, and rounding mode
* - macros __env_flags(env), __env_mask(env), and __env_round(env), which
* extract fields from an fenv_t
* - a definition of __fenv_static
*
* If the architecture supports an optional FPU, it's recommended that you
* define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it
* doesn't matter how you define them.
*/
extern int __softfloat_float_exception_flags;
extern int __softfloat_float_exception_mask;
extern int __softfloat_float_rounding_mode;
void __softfloat_float_raise(int);
__fenv_static inline int
feclearexcept(int __excepts)
{
__softfloat_float_exception_flags &= ~__excepts;
return (0);
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
*__flagp = __softfloat_float_exception_flags & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
__softfloat_float_exception_flags &= ~__excepts;
__softfloat_float_exception_flags |= *__flagp & __excepts;
return (0);
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
__softfloat_float_raise(__excepts);
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
return (__softfloat_float_exception_flags & __excepts);
}
__fenv_static inline int
fegetround(void)
{
return (__softfloat_float_rounding_mode);
}
__fenv_static inline int
fesetround(int __round)
{
__softfloat_float_rounding_mode = __round;
return (0);
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
__set_env(*__envp, __softfloat_float_exception_flags,
__softfloat_float_exception_mask, __softfloat_float_rounding_mode);
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fenv_t __env;
fegetenv(__envp);
__softfloat_float_exception_flags = 0;
__softfloat_float_exception_mask = 0;
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
__softfloat_float_exception_flags = __env_flags(*__envp);
__softfloat_float_exception_mask = __env_mask(*__envp);
__softfloat_float_rounding_mode = __env_round(*__envp);
return (0);
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
int __oflags = __softfloat_float_exception_flags;
fesetenv(__envp);
feraiseexcept(__oflags);
return (0);
}
#if __BSD_VISIBLE
/* We currently provide no external definitions of the functions below. */
__fenv_static inline int
feenableexcept(int __mask)
{
int __omask = __softfloat_float_exception_mask;
__softfloat_float_exception_mask |= __mask;
return (__omask);
}
__fenv_static inline int
fedisableexcept(int __mask)
{
int __omask = __softfloat_float_exception_mask;
__softfloat_float_exception_mask &= ~__mask;
return (__omask);
}
__fenv_static inline int
fegetexcept(void)
{
return (__softfloat_float_exception_mask);
}
#endif /* __BSD_VISIBLE */
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