1/* w_gammal.c -- long double version of w_gamma.c.
2 * Conversion to long double by Ulrich Drepper,
3 * Cygnus Support, drepper@cygnus.com.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17/* long double gammal(double x)
18 * Return the Gamma function of x.
19 */
20
21#include <errno.h>
22#include <math.h>
23#include <math_private.h>
24#include <math-svid-compat.h>
25#include <libm-alias-ldouble.h>
26
27#if LIBM_SVID_COMPAT
28long double
29__tgammal(long double x)
30{
31 int local_signgam;
32 long double y = __ieee754_gammal_r(x,&local_signgam);
33
34 if(__glibc_unlikely (!isfinite (y) || y == 0)
35 && (isfinite (x) || (isinf (x) && x < 0.0))
36 && _LIB_VERSION != _IEEE_) {
37 if(x==0.0)
38 return __kernel_standard_l(x,x,250); /* tgamma pole */
39 else if(floorl(x)==x&&x<0.0L)
40 return __kernel_standard_l(x,x,241); /* tgamma domain */
41 else if (y == 0)
42 __set_errno (ERANGE); /* tgamma underflow */
43 else
44 return __kernel_standard_l(x,x,240); /* tgamma overflow */
45 }
46 return local_signgam < 0 ? - y : y;
47}
48libm_alias_ldouble (__tgamma, tgamma)
49#endif
50