1/* @(#)w_lgamma.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
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
9 * is preserved.
10 * ====================================================
11 */
12
13/* double lgamma(double x)
14 * Return the logarithm of the Gamma function of x.
15 *
16 * Method: call __ieee754_lgamma_r
17 */
18
19#include <math.h>
20#include <math_private.h>
21
22#include <lgamma-compat.h>
23
24#if BUILD_LGAMMA
25double
26LGFUNC (__lgamma) (double x)
27{
28 double y = CALL_LGAMMA (double, __ieee754_lgamma_r, x);
29 if(__builtin_expect(!isfinite(y), 0)
30 && isfinite(x) && _LIB_VERSION != _IEEE_)
31 return __kernel_standard(x, x,
32 __floor(x)==x&&x<=0.0
33 ? 15 /* lgamma pole */
34 : 14); /* lgamma overflow */
35
36 return y;
37}
38# if USE_AS_COMPAT
39compat_symbol (libm, __lgamma_compat, lgamma, LGAMMA_OLD_VER);
40# ifdef NO_LONG_DOUBLE
41strong_alias (__lgamma_compat, __lgammal_compat)
42compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);
43# endif
44# else
45versioned_symbol (libm, __lgamma, lgamma, LGAMMA_NEW_VER);
46# ifdef NO_LONG_DOUBLE
47strong_alias (__lgamma, __lgammal)
48versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);
49# endif
50# endif
51# if GAMMA_ALIAS
52strong_alias (LGFUNC (__lgamma), __gamma)
53weak_alias (__gamma, gamma)
54# ifdef NO_LONG_DOUBLE
55strong_alias (__gamma, __gammal)
56weak_alias (__gamma, gammal)
57# endif
58# endif
59#endif
60