source: trunk/sys/libm/w_log.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

First import

File size: 864 bytes
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1
2/* @(#)w_log.c 5.1 93/09/24 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunPro, 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 log(x)
16 */
17
18#include <libm/fdlibm.h>
19
20
21#ifdef __STDC__
22        double log(double x)            /* wrapper log */
23#else
24        double 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_ || isnan(x) || x > 0.0) return z;
34        if(x==0.0)
35            return __kernel_standard(x,x,16); /* log(0) */
36        else 
37            return __kernel_standard(x,x,17); /* log(x<0) */
38#endif
39}
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