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 * ====================================================
14 static char rcsid[] = "$FreeBSD$";
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"
32 return __ieee754_lgamma_r(x,&signgam);
35 y = __ieee754_lgamma_r(x,&signgam);
36 if(_LIB_VERSION == _IEEE_) return y;
37 if(!finite(y)&&finite(x)) {
38 if(floor(x)==x&&x<=0.0)
39 return __kernel_standard(x,x,15); /* lgamma pole */
41 return __kernel_standard(x,x,14); /* lgamma overflow */