fenv-fp.h

/*-
 * 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.
 *
 * $FreeBSD$
 */
 
__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 rounding_mode)
{
    fexcept_t fcsr;
 
    if (rounding_mode & ~_ROUND_MASK)
        return (-1);
 
    __cfc1(fcsr);
    fcsr &= ~_ROUND_MASK;
    fcsr |= rounding_mode;
    __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);
}
#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 */