mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
44 lines
1,021 B
C
44 lines
1,021 B
C
/* @(#)w_log.c 5.1 93/09/24 */
|
|
/*
|
|
* ====================================================
|
|
* 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: w_log.c,v 1.10 2007/08/20 16:01:40 drochner Exp $");
|
|
#endif
|
|
|
|
/*
|
|
* wrapper log(x)
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(log, _log)
|
|
#endif
|
|
|
|
double
|
|
log(double x) /* wrapper log */
|
|
{
|
|
#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
|
|
}
|