1 /* @(#)w_lgamma.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 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $";
17 /* double lgamma(double x)
18 * Return the logarithm of the Gamma function of x.
20 * Method: call __ieee754_lgamma_r
24 #include "math_private.h"
29 double lgamma(double x)
36 return __ieee754_lgamma_r(x,&signgam);
39 y = __ieee754_lgamma_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,15); /* lgamma pole */
45 return __kernel_standard(x,x,14); /* lgamma overflow */