forked from KolibriOS/kolibrios
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
|
/* wf_log.c -- float version of w_log.c.
|
||
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ====================================================
|
||
|
|
* 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 logf(x)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fdlibm.h"
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
float logf(float x) /* wrapper logf */
|
||
|
|
#else
|
||
|
|
float logf(x) /* wrapper logf */
|
||
|
|
float x;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
#ifdef _IEEE_LIBM
|
||
|
|
return __ieee754_logf(x);
|
||
|
|
#else
|
||
|
|
float z;
|
||
|
|
struct exception exc;
|
||
|
|
z = __ieee754_logf(x);
|
||
|
|
if(_LIB_VERSION == _IEEE_ || isnan(x) || x > (float)0.0) return z;
|
||
|
|
#ifndef HUGE_VAL
|
||
|
|
#define HUGE_VAL inf
|
||
|
|
double inf = 0.0;
|
||
|
|
|
||
|
|
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
|
||
|
|
#endif
|
||
|
|
exc.name = "logf";
|
||
|
|
exc.err = 0;
|
||
|
|
exc.arg1 = exc.arg2 = (double)x;
|
||
|
|
if (_LIB_VERSION == _SVID_)
|
||
|
|
exc.retval = -HUGE;
|
||
|
|
else
|
||
|
|
exc.retval = -HUGE_VAL;
|
||
|
|
if(x==(float)0.0) {
|
||
|
|
/* logf(0) */
|
||
|
|
exc.type = SING;
|
||
|
|
if (_LIB_VERSION == _POSIX_)
|
||
|
|
errno = ERANGE;
|
||
|
|
else if (!matherr(&exc)) {
|
||
|
|
errno = ERANGE;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
/* logf(x<0) */
|
||
|
|
exc.type = DOMAIN;
|
||
|
|
if (_LIB_VERSION == _POSIX_)
|
||
|
|
errno = EDOM;
|
||
|
|
else if (!matherr(&exc)) {
|
||
|
|
errno = EDOM;
|
||
|
|
}
|
||
|
|
exc.retval = nan("");
|
||
|
|
}
|
||
|
|
if (exc.err != 0)
|
||
|
|
errno = exc.err;
|
||
|
|
return (float)exc.retval;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef _DOUBLE_IS_32BITS
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
double log(double x)
|
||
|
|
#else
|
||
|
|
double log(x)
|
||
|
|
double x;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
return (double) logf((float) x);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|