w_yn.c (1208B)
1 /* from: @(#)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_yn.c,v 1.5 2002/05/28 18:15:04 alfred Exp $"; 15 #endif 16 17 /* 18 * wrapper yn(int n, double x) 19 */ 20 21 #include "math.h" 22 #include "math_private.h" 23 24 double 25 yn(int n, double x) /* wrapper yn */ 26 { 27 #ifdef _IEEE_LIBM 28 return __ieee754_yn(n,x); 29 #else 30 double z; 31 z = __ieee754_yn(n,x); 32 if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z; 33 if(x <= 0.0){ 34 if(x==0.0) 35 /* d= -one/(x-x); */ 36 return __kernel_standard((double)n,x,12); 37 else 38 /* d = zero/(x-x); */ 39 return __kernel_standard((double)n,x,13); 40 } 41 if(x>X_TLOSS) { 42 return __kernel_standard((double)n,x,39); /* yn(x>X_TLOSS,n) */ 43 } else 44 return z; 45 #endif 46 }