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 #include <math-svid-compat.h>
22 #include <libm-alias-double.h>
23
24 #include <lgamma-compat.h>
25
26 #if BUILD_LGAMMA
27 double
LGFUNC(__lgamma)28 LGFUNC (__lgamma) (double x)
29 {
30 double y = CALL_LGAMMA (double, __ieee754_lgamma_r, x);
31 if(__builtin_expect(!isfinite(y), 0)
32 && isfinite(x) && _LIB_VERSION != _IEEE_)
33 return __kernel_standard(x, x,
34 floor(x)==x&&x<=0.0
35 ? 15 /* lgamma pole */
36 : 14); /* lgamma overflow */
37
38 return y;
39 }
40 # if USE_AS_COMPAT
41 compat_symbol (libm, __lgamma_compat, lgamma, LGAMMA_OLD_VER);
42 # ifdef NO_LONG_DOUBLE
43 strong_alias (__lgamma_compat, __lgammal_compat)
44 compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);
45 # endif
46 # else
47 versioned_symbol (libm, __lgamma, lgamma, LGAMMA_NEW_VER);
48 # ifdef NO_LONG_DOUBLE
49 strong_alias (__lgamma, __lgammal)
50 versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);
51 # endif
52 libm_alias_double_other (__lgamma, lgamma)
53 # endif
54 # if GAMMA_ALIAS
55 strong_alias (LGFUNC (__lgamma), __gamma)
56 weak_alias (__gamma, gamma)
57 # ifdef NO_LONG_DOUBLE
58 strong_alias (__gamma, __gammal)
59 weak_alias (__gamma, gammal)
60 # endif
61 # endif
62 #endif
63