| /* w_jnl.c -- long double version of w_jn.c. |
| * Conversion to long double by Ulrich Drepper, |
| * Cygnus Support, drepper@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. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: $"; |
| #endif |
| |
| /* |
| * wrapper jn(int n, double x), yn(int n, double x) |
| * floating point Bessel's function of the 1st and 2nd kind |
| * of order n |
| * |
| * Special cases: |
| * y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal; |
| * y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal. |
| * Note 2. About jn(n,x), yn(n,x) |
| * For n=0, j0(x) is called, |
| * for n=1, j1(x) is called, |
| * for n<x, forward recursion us used starting |
| * from values of j0(x) and j1(x). |
| * for n>x, a continued fraction approximation to |
| * j(n,x)/j(n-1,x) is evaluated and then backward |
| * recursion is used starting from a supposed value |
| * for j(n,x). The resulting value of j(0,x) is |
| * compared with the actual value to correct the |
| * supposed value of j(n,x). |
| * |
| * yn(n,x) is similar in all respects, except |
| * that forward recursion is used for all |
| * values of n>1. |
| * |
| */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| |
| long double __jnl(int n, long double x) /* wrapper jnl */ |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_jnl(n,x); |
| #else |
| long double z; |
| z = __ieee754_jnl(n,x); |
| if (_LIB_VERSION == _IEEE_ |
| || _LIB_VERSION == _POSIX_ |
| || __isnanl(x)) |
| return z; |
| if(fabsl(x)>X_TLOSS) { |
| return __kernel_standard_l((double)n,x,238); /* jn(|x|>X_TLOSS,n) */ |
| } else |
| return z; |
| #endif |
| } |
| weak_alias (__jnl, jnl) |
| |
| long double __ynl(int n, long double x) /* wrapper ynl */ |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_ynl(n,x); |
| #else |
| long double z; |
| z = __ieee754_ynl(n,x); |
| if(_LIB_VERSION == _IEEE_ || __isnanl(x) ) return z; |
| if(x <= 0.0){ |
| if(x==0.0) |
| /* d= -one/(x-x); */ |
| return __kernel_standard_l((double)n,x,212); |
| else |
| /* d = zero/(x-x); */ |
| return __kernel_standard_l((double)n,x,213); |
| } |
| if(x>X_TLOSS && _LIB_VERSION != _POSIX_) { |
| return __kernel_standard_l((double)n,x,239); /* yn(x>X_TLOSS,n) */ |
| } else |
| return z; |
| #endif |
| } |
| weak_alias (__ynl, ynl) |
