mirror of https://github.com/PrimeDecomp/prime.git
39 lines
865 B
C
39 lines
865 B
C
|
/* @(#)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
|
||
|
|
}
|