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[FreeBSD/FreeBSD.git] / lib / msun / src / w_ynf.c
1 /* w_ynf.c -- float version of w_yn.c.
2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3  */
4
5 /*
6  * ====================================================
7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8  *
9  * Developed at SunPro, a Sun Microsystems, Inc. business.
10  * Permission to use, copy, modify, and distribute this
11  * software is freely granted, provided that this notice
12  * is preserved.
13  * ====================================================
14  */
15
16 #ifndef lint
17 static char rcsid[] = "$FreeBSD$";
18 #endif
19
20 #include "math.h"
21 #include "math_private.h"
22
23 #ifdef __STDC__
24         float ynf(int n, float x)       /* wrapper ynf */
25 #else
26         float ynf(n,x)                  /* wrapper ynf */
27         float x; int n;
28 #endif
29 {
30 #ifdef _IEEE_LIBM
31         return __ieee754_ynf(n,x);
32 #else
33         float z;
34         z = __ieee754_ynf(n,x);
35         if(_LIB_VERSION == _IEEE_ || isnanf(x) ) return z;
36         if(x <= (float)0.0){
37                 if(x==(float)0.0)
38                     /* d= -one/(x-x); */
39                     return (float)__kernel_standard((double)n,(double)x,112);
40                 else
41                     /* d = zero/(x-x); */
42                     return (float)__kernel_standard((double)n,(double)x,113);
43         }
44         if(x>(float)X_TLOSS) {
45             /* yn(x>X_TLOSS,n) */
46             return (float)__kernel_standard((double)n,(double)x,139);
47         } else
48             return z;
49 #endif
50 }