1 /* @(#)w_gamma.c 5.1 93/09/24 */
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
10 * ====================================================
14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_gamma.c,v 1.5 1999/08/28 00:07:01 peter Exp $";
17 /* double gamma(double x)
18 * Return the logarithm of the Gamma function of x.
20 * Method: call gamma_r
24 #include "math_private.h"
29 double gamma(double x)
36 return __ieee754_gamma_r(x,&signgam);
39 y = __ieee754_gamma_r(x,&signgam);
40 if(_LIB_VERSION == _IEEE_) return y;
41 if(!finite(y)&&finite(x)) {
42 if(floor(x)==x&&x<=0.0)
43 return __kernel_standard(x,x,41); /* gamma pole */
45 return __kernel_standard(x,x,40); /* gamma overflow */