w_j0.c

/* @(#)w_j0.c 1.3 95/01/18 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunSoft, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

/*
 * wrapper j0(double x), y0(double x)
 */

#include "fdlibm.h"

double j0(double x)             /* wrapper j0 */
{
#ifdef _IEEE_LIBM
        return __ieee754_j0(x);
#else
        double z = __ieee754_j0(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
        if(fabs(x)>X_TLOSS) {
                return __kernel_standard(x,x,34); /* j0(|x|>X_TLOSS) */
        } else
            return z;
#endif
}

double y0(double x)             /* wrapper y0 */
{
#ifdef _IEEE_LIBM
        return __ieee754_y0(x);
#else
        double z;
        z = __ieee754_y0(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
        if(x <= 0.0){
                if(x==0.0)
                    /* d= -one/(x-x); */
                    return __kernel_standard(x,x,8);
                else
                    /* d = zero/(x-x); */
                    return __kernel_standard(x,x,9);
        }
        if(x>X_TLOSS) {
                return __kernel_standard(x,x,35); /* y0(x>X_TLOSS) */
        } else
            return z;
#endif
}