60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
|
/* w_gammaf.c -- float version of w_gamma.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.
|
||
|
|
* ====================================================
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "math.h"
|
||
|
|
#include "fdlibm.h"
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
float tgammaf(float x)
|
||
|
|
#else
|
||
|
|
float tgammaf(x)
|
||
|
|
float x;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
float y;
|
||
|
|
int local_signgam;
|
||
|
|
y = __ieee754_gammaf_r(x,&local_signgam);
|
||
|
|
if (local_signgam < 0) y = -y;
|
||
|
|
#ifdef _IEEE_LIBM
|
||
|
|
return y;
|
||
|
|
#else
|
||
|
|
if(_LIB_VERSION == _IEEE_) return y;
|
||
|
|
|
||
|
|
if(!finitef(y)&&finitef(x)) {
|
||
|
|
if(floorf(x)==x&&x<=(float)0.0)
|
||
|
|
/* tgammaf pole */
|
||
|
|
return (float)__kernel_standard((double)x,(double)x,141);
|
||
|
|
else
|
||
|
|
/* tgammaf overflow */
|
||
|
|
return (float)__kernel_standard((double)x,(double)x,140);
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef _DOUBLE_IS_32BITS
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
double tgamma(double x)
|
||
|
|
#else
|
||
|
|
double tgamma(x)
|
||
|
|
double x;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
return (double) tgammaf((float) x);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|