1 
2 /* @(#)w_log.c 1.3 95/01/18 */
3 /*
4  * ====================================================
5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6  *
7  * Developed at SunSoft, a Sun Microsystems, Inc. business.
8  * Permission to use, copy, modify, and distribute this
9  * software is freely granted, provided that this notice
10  * is preserved.
11  * ====================================================
12  */
13 
14 /*
15  * wrapper ieee_log(x)
16  */
17 
18 #include "fdlibm.h"
19 
20 
21 #ifdef __STDC__
ieee_log(double x)22 	double ieee_log(double x)		/* wrapper log */
23 #else
24 	double ieee_log(x)			/* wrapper log */
25 	double x;
26 #endif
27 {
28 #ifdef _IEEE_LIBM
29 	return __ieee754_log(x);
30 #else
31 	double z;
32 	z = __ieee754_log(x);
33 	if(_LIB_VERSION == _IEEE_ || ieee_isnan(x) || x > 0.0) return z;
34 	if(x==0.0)
35 	    return __kernel_standard(x,x,16); /* ieee_log(0) */
36 	else
37 	    return __kernel_standard(x,x,17); /* ieee_log(x<0) */
38 #endif
39 }
40