mirror of git://gcc.gnu.org/git/gcc.git
40 lines
860 B
C
40 lines
860 B
C
|
|
/* @(#)w_log.c 1.3 95/01/18 */
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunSoft, 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 log */
|
|
#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
|
|
}
|