src/MSL_C.PPCEABI.bare.H/w_log.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38


/* @(#)w_log.c 1.2 95/01/04 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
 * wrapper log(x)
 */

#include "fdlibm.h"

#ifdef __STDC__
double log(double x) /* wrapper pow */
#else
double log(x) /* wrapper log */
double x;
#endif
{
#ifdef _IEEE_LIBM
  return __ieee754_log(x);
#else
  double z;
  z = __ieee754_log(x);
  if (_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0)
    return z;
  if (x == 0.0)
    return __kernel_standard(x, x, 16); /* log(0) */
  else
    return __kernel_standard(x, x, 17); /* log(x<0) */
#endif
}