newlib-cygwin/newlib/libm/mathfp/sf_log.c

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2000-02-18 03:39:52 +08:00
/* @(#)z_logf.c 1.0 98/08/13 */
/******************************************************************
* Logarithm
*
* Input:
* x - floating point value
*
* Output:
* natural logarithm of x
*
* Description:
* This routine returns the natural logarithm of x.
*
*****************************************************************/
#include "fdlibm.h"
#include "zmath.h"
float
_DEFUN (logf, (float),
float x)
{
return (logarithmf (x, 0));
}
#ifdef _DOUBLE_IS_32BITS
double log (double x)
{
return (double) logf ((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */