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 * ====================================================
13 /* double gamma(double x)
14 * Return the logarithm of the Gamma function of x or the Gamma function of x,
15 * depending on the library mode.
20 #include <math_private.h>
26 double y = __ieee754_gamma_r(x,&local_signgam);
28 if(__glibc_unlikely (!__finite (y) || y == 0)
29 && (__finite (x) || __isinf (x) < 0)
30 && _LIB_VERSION != _IEEE_) {
32 return __kernel_standard(x,x,50); /* tgamma pole */
33 else if(__floor(x)==x&&x<0.0)
34 return __kernel_standard(x,x,41); /* tgamma domain */
36 __set_errno (ERANGE); /* tgamma underflow */
38 return __kernel_standard(x,x,40); /* tgamma overflow */
40 return local_signgam < 0 ? -y : y;
42 weak_alias (__tgamma, tgamma)
44 strong_alias (__tgamma, __tgammal)
45 weak_alias (__tgamma, tgammal)