w_jn.c (923B)
1 /* @(#)w_jn.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #ifndef lint 14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_jn.c,v 1.9 2002/05/28 18:15:04 alfred Exp $"; 15 #endif 16 17 /* 18 * wrapper jn(int n, double x) 19 */ 20 21 #include "math.h" 22 #include "math_private.h" 23 24 double 25 jn(int n, double x) /* wrapper jn */ 26 { 27 #ifdef _IEEE_LIBM 28 return __ieee754_jn(n,x); 29 #else 30 double z; 31 z = __ieee754_jn(n,x); 32 if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z; 33 if(fabs(x)>X_TLOSS) { 34 return __kernel_standard((double)n,x,38); /* jn(|x|>X_TLOSS,n) */ 35 } else 36 return z; 37 #endif 38 }