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 * ====================================================
12 * $FreeBSD: src/lib/msun/src/w_gamma.c,v 1.5 1999/08/28 00:07:01 peter Exp $
13 * $DragonFly: src/lib/msun/src/Attic/w_gamma.c,v 1.2 2003/06/17 04:26:53 dillon Exp $
16 /* double gamma(double x)
17 * Return the logarithm of the Gamma function of x.
19 * Method: call gamma_r
23 #include "math_private.h"
28 double gamma(double x)
35 return __ieee754_gamma_r(x,&signgam);
38 y = __ieee754_gamma_r(x,&signgam);
39 if(_LIB_VERSION == _IEEE_) return y;
40 if(!finite(y)&&finite(x)) {
41 if(floor(x)==x&&x<=0.0)
42 return __kernel_standard(x,x,41); /* gamma pole */
44 return __kernel_standard(x,x,40); /* gamma overflow */