1*2fe8fb19SBen Gras /* @(#)w_log.c 5.1 93/09/24 */
2*2fe8fb19SBen Gras /*
3*2fe8fb19SBen Gras * ====================================================
4*2fe8fb19SBen Gras * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5*2fe8fb19SBen Gras *
6*2fe8fb19SBen Gras * Developed at SunPro, a Sun Microsystems, Inc. business.
7*2fe8fb19SBen Gras * Permission to use, copy, modify, and distribute this
8*2fe8fb19SBen Gras * software is freely granted, provided that this notice
9*2fe8fb19SBen Gras * is preserved.
10*2fe8fb19SBen Gras * ====================================================
11*2fe8fb19SBen Gras */
12*2fe8fb19SBen Gras
13*2fe8fb19SBen Gras #include <sys/cdefs.h>
14*2fe8fb19SBen Gras #if defined(LIBM_SCCS) && !defined(lint)
15*2fe8fb19SBen Gras __RCSID("$NetBSD: w_log.c,v 1.10 2007/08/20 16:01:40 drochner Exp $");
16*2fe8fb19SBen Gras #endif
17*2fe8fb19SBen Gras
18*2fe8fb19SBen Gras /*
19*2fe8fb19SBen Gras * wrapper log(x)
20*2fe8fb19SBen Gras */
21*2fe8fb19SBen Gras
22*2fe8fb19SBen Gras #include "namespace.h"
23*2fe8fb19SBen Gras #include "math.h"
24*2fe8fb19SBen Gras #include "math_private.h"
25*2fe8fb19SBen Gras
26*2fe8fb19SBen Gras #ifdef __weak_alias
__weak_alias(log,_log)27*2fe8fb19SBen Gras __weak_alias(log, _log)
28*2fe8fb19SBen Gras #endif
29*2fe8fb19SBen Gras
30*2fe8fb19SBen Gras double
31*2fe8fb19SBen Gras log(double x) /* wrapper log */
32*2fe8fb19SBen Gras {
33*2fe8fb19SBen Gras #ifdef _IEEE_LIBM
34*2fe8fb19SBen Gras return __ieee754_log(x);
35*2fe8fb19SBen Gras #else
36*2fe8fb19SBen Gras double z;
37*2fe8fb19SBen Gras z = __ieee754_log(x);
38*2fe8fb19SBen Gras if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0) return z;
39*2fe8fb19SBen Gras if(x==0.0)
40*2fe8fb19SBen Gras return __kernel_standard(x,x,16); /* log(0) */
41*2fe8fb19SBen Gras else
42*2fe8fb19SBen Gras return __kernel_standard(x,x,17); /* log(x<0) */
43*2fe8fb19SBen Gras #endif
44*2fe8fb19SBen Gras }
45