/*-
 * 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: releng/10.1/lib/msun/ia64/fenv.h 226218 2011-10-10 15:43:09Z das $
 */

#ifndef _IA64_FENV_H_
#define _IA64_FENV_H_

#include <sys/featuretest.h>
#include <sys/stdint.h>

#ifndef __fenv_static
#define __fenv_static   static
#endif

typedef __uint64_t      fenv_t;
typedef __uint16_t      fexcept_t;

/* Exception flags */
#define FE_INVALID      0x01
#define FE_DENORMAL     0x02
#define FE_DIVBYZERO    0x04
#define FE_OVERFLOW     0x08
#define FE_UNDERFLOW    0x10
#define FE_INEXACT      0x20
#define FE_ALL_EXCEPT   (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
                         FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)

/* Rounding modes */
#define FE_TONEAREST    0x0000
#define FE_DOWNWARD     0x0400
#define FE_UPWARD       0x0800
#define FE_TOWARDZERO   0x0c00
#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)

#define _FPUSW_SHIFT    13

#define __stfpsr(__r)   __asm __volatile("mov %0=ar.fpsr" : "=r" (*(__r)))
#define __ldfpsr(__r)   __asm __volatile("mov ar.fpsr=%0;;" : : "r" (__r))

#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif

__fenv_static inline int
feclearexcept(int __excepts)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        __fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
        __ldfpsr(__fpsr);
        return (0);
}

__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        *__flagp = (fexcept_t)(__fpsr >> _FPUSW_SHIFT) & __excepts;
        return (0);
}

__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        __fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
        __fpsr |= (fenv_t)(__excepts & *__flagp) << _FPUSW_SHIFT;
        __ldfpsr(__fpsr);
        return (0);
}

/*
 * It is worthwhile to use the inline version of this function iff it
 * is called with arguments that are compile-time constants (due to
 * dead code elimination).  Unfortunately, gcc isn't smart enough to
 * figure this out automatically, and there's no way to tell it.
 * We assume that constant arguments will be the common case.
 */
__fenv_static inline int
feraiseexcept(int __excepts)
{
        volatile double d;

        /*
         * With a compiler that supports the FENV_ACCESS pragma
         * properly, simple expressions like '0.0 / 0.0' should
         * be sufficient to generate traps.  Unfortunately, we
         * need to bring a volatile variable into the equation
         * to prevent incorrect optimizations.
         */
        if (__excepts & FE_INVALID) {
                d = 0.0;
                d = 0.0 / d;
        }
        if (__excepts & FE_DIVBYZERO) {
                d = 0.0;
                d = 1.0 / d;
        }
        if (__excepts & FE_OVERFLOW) {
                d = 0x1.ffp1023;
                d *= 2.0;
        }
        if (__excepts & FE_UNDERFLOW) {
                d = 0x1p-1022;
                d /= 0x1p1023;
        }
        if (__excepts & FE_INEXACT) {
                d = 0x1p-1022;
                d += 1.0;
        }
        return (0);
}

__fenv_static inline int
fetestexcept(int __excepts)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        return ((__fpsr >> _FPUSW_SHIFT) & __excepts);
}


__fenv_static inline int
fegetround(void)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        return (__fpsr & _ROUND_MASK);
}

__fenv_static inline int
fesetround(int __round)
{
        fenv_t __fpsr;

        if (__round & ~_ROUND_MASK)
                return (-1);
        __stfpsr(&__fpsr);
        __fpsr &= ~_ROUND_MASK;
        __fpsr |= __round;
        __ldfpsr(__fpsr);
        return (0);
}

__fenv_static inline int
fegetenv(fenv_t *__envp)
{

        __stfpsr(__envp);
        return (0);
}

__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        *__envp = __fpsr;
        __fpsr &= ~((fenv_t)FE_ALL_EXCEPT << _FPUSW_SHIFT);
        __fpsr |= FE_ALL_EXCEPT;
        __ldfpsr(__fpsr);
        return (0);
}

__fenv_static inline int
fesetenv(const fenv_t *__envp)
{

        __ldfpsr(*__envp);
        return (0);
}

int feupdateenv(const fenv_t *__envp);

#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic pop
#endif

#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)

__fenv_static inline int
feenableexcept(int __mask)
{
        fenv_t __newfpsr, __oldfpsr;

        __stfpsr(&__oldfpsr);
        __newfpsr = __oldfpsr & ~(__mask & FE_ALL_EXCEPT);
        __ldfpsr(__newfpsr);
        return (~__oldfpsr & FE_ALL_EXCEPT);
}

__fenv_static inline int
fedisableexcept(int __mask)
{
        fenv_t __newfpsr, __oldfpsr;

        __stfpsr(&__oldfpsr);
        __newfpsr = __oldfpsr | (__mask & FE_ALL_EXCEPT);
        __ldfpsr(__newfpsr);
        return (~__oldfpsr & FE_ALL_EXCEPT);
}

__fenv_static inline int
fegetexcept(void)
{
        fenv_t __fpsr;

        __stfpsr(&__fpsr);
        return (~__fpsr & FE_ALL_EXCEPT);
}

#endif /* _NETBSD_SOURCE || _GNU_SOURCE */

__END_DECLS

#endif  /* !_IA64_FENV_H_ */