Subversion Repositories openrisc_2011-10-31

/* wf_atanh.c -- float version of w_atanh.c.

 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.

 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

/*

 * wrapper atanhf(x)

 */

#include "fdlibm.h"

#include <errno.h>

#ifdef __STDC__

        float atanhf(float x)           /* wrapper atanhf */

#else

        float atanhf(x)                 /* wrapper atanhf */

        float x;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_atanhf(x);

#else

        float z,y;

        struct exception exc;

        z = __ieee754_atanhf(x);

        if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;

        y = fabsf(x);

        if(y>=(float)1.0) {

            if(y>(float)1.0) {

                /* atanhf(|x|>1) */

                exc.type = DOMAIN;

                exc.name = "atanhf";

                exc.err = 0;

                exc.arg1 = exc.arg2 = (double)x;

                exc.retval = 0.0/0.0;

                if (_LIB_VERSION == _POSIX_)

                  errno = EDOM;

                else if (!matherr(&exc)) {

                  errno = EDOM;

                }

            } else {

                /* atanhf(|x|=1) */

                exc.type = SING;

                exc.name = "atanhf";

                exc.err = 0;

                exc.arg1 = exc.arg2 = (double)x;

                exc.retval = x/0.0;     /* sign(x)*inf */

                if (_LIB_VERSION == _POSIX_)

                  errno = EDOM;

                else if (!matherr(&exc)) {

                  errno = EDOM;

                }

            }

            if (exc.err != 0)

              errno = exc.err;

            return (float)exc.retval;

        } else

            return z;

#endif

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double atanh(double x)

#else

        double atanh(x)

        double x;

#endif

{

        return (double) atanhf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */