/* wf_gamma.c -- float version of w_gamma.c.
|
/* wf_gamma.c -- float version of w_gamma.c.
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
*/
|
*/
|
|
|
/*
|
/*
|
* ====================================================
|
* ====================================================
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
*
|
*
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
* Permission to use, copy, modify, and distribute this
|
* Permission to use, copy, modify, and distribute this
|
* software is freely granted, provided that this notice
|
* software is freely granted, provided that this notice
|
* is preserved.
|
* is preserved.
|
* ====================================================
|
* ====================================================
|
*
|
*
|
*/
|
*/
|
|
|
#include "fdlibm.h"
|
#include "fdlibm.h"
|
#include <reent.h>
|
#include <reent.h>
|
#include <errno.h>
|
#include <errno.h>
|
|
|
#ifdef __STDC__
|
#ifdef __STDC__
|
float gammaf(float x)
|
float gammaf(float x)
|
#else
|
#else
|
float gammaf(x)
|
float gammaf(x)
|
float x;
|
float x;
|
#endif
|
#endif
|
{
|
{
|
#ifdef _IEEE_LIBM
|
#ifdef _IEEE_LIBM
|
return __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
|
return __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
|
#else
|
#else
|
float y;
|
float y;
|
struct exception exc;
|
struct exception exc;
|
y = __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
|
y = __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
|
if(_LIB_VERSION == _IEEE_) return y;
|
if(_LIB_VERSION == _IEEE_) return y;
|
if(!finitef(y)&&finitef(x)) {
|
if(!finitef(y)&&finitef(x)) {
|
#ifndef HUGE_VAL
|
#ifndef HUGE_VAL
|
#define HUGE_VAL inf
|
#define HUGE_VAL inf
|
double inf = 0.0;
|
double inf = 0.0;
|
|
|
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
|
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
|
#endif
|
#endif
|
if(floorf(x)==x&&x<=(float)0.0) {
|
if(floorf(x)==x&&x<=(float)0.0) {
|
/* gammaf(-integer) or gammaf(0) */
|
/* gammaf(-integer) or gammaf(0) */
|
exc.type = SING;
|
exc.type = SING;
|
exc.name = "gammaf";
|
exc.name = "gammaf";
|
exc.err = 0;
|
exc.err = 0;
|
exc.arg1 = exc.arg2 = (double)x;
|
exc.arg1 = exc.arg2 = (double)x;
|
if (_LIB_VERSION == _SVID_)
|
if (_LIB_VERSION == _SVID_)
|
exc.retval = HUGE;
|
exc.retval = HUGE;
|
else
|
else
|
exc.retval = HUGE_VAL;
|
exc.retval = HUGE_VAL;
|
if (_LIB_VERSION == _POSIX_)
|
if (_LIB_VERSION == _POSIX_)
|
errno = EDOM;
|
errno = EDOM;
|
else if (!matherr(&exc)) {
|
else if (!matherr(&exc)) {
|
errno = EDOM;
|
errno = EDOM;
|
}
|
}
|
} else {
|
} else {
|
/* gammaf(finite) overflow */
|
/* gammaf(finite) overflow */
|
exc.type = OVERFLOW;
|
exc.type = OVERFLOW;
|
exc.name = "gammaf";
|
exc.name = "gammaf";
|
exc.err = 0;
|
exc.err = 0;
|
exc.arg1 = exc.arg2 = (double)x;
|
exc.arg1 = exc.arg2 = (double)x;
|
if (_LIB_VERSION == _SVID_)
|
if (_LIB_VERSION == _SVID_)
|
exc.retval = HUGE;
|
exc.retval = HUGE;
|
else
|
else
|
exc.retval = HUGE_VAL;
|
exc.retval = HUGE_VAL;
|
if (_LIB_VERSION == _POSIX_)
|
if (_LIB_VERSION == _POSIX_)
|
errno = ERANGE;
|
errno = ERANGE;
|
else if (!matherr(&exc)) {
|
else if (!matherr(&exc)) {
|
errno = ERANGE;
|
errno = ERANGE;
|
}
|
}
|
}
|
}
|
if (exc.err != 0)
|
if (exc.err != 0)
|
errno = exc.err;
|
errno = exc.err;
|
return (float)exc.retval;
|
return (float)exc.retval;
|
} else
|
} else
|
return y;
|
return y;
|
#endif
|
#endif
|
}
|
}
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
#ifdef __STDC__
|
#ifdef __STDC__
|
double gamma(double x)
|
double gamma(double x)
|
#else
|
#else
|
double gamma(x)
|
double gamma(x)
|
double x;
|
double x;
|
#endif
|
#endif
|
{
|
{
|
return (double) gammaf((float) x);
|
return (double) gammaf((float) x);
|
}
|
}
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|
|
|
