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f7eac6eb RM |
1 | /* @(#)w_gamma.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 | |
30de3b18 | 8 | * software is freely granted, provided that this notice |
f7eac6eb RM |
9 | * is preserved. |
10 | * ==================================================== | |
11 | */ | |
12 | ||
13 | #if defined(LIBM_SCCS) && !defined(lint) | |
14 | static char rcsid[] = "$NetBSD: w_gamma.c,v 1.7 1995/11/20 22:06:43 jtc Exp $"; | |
15 | #endif | |
16 | ||
17 | /* double gamma(double x) | |
d705269e UD |
18 | * Return the logarithm of the Gamma function of x or the Gamma function of x, |
19 | * depending on the library mode. | |
f7eac6eb RM |
20 | */ |
21 | ||
9d13fb24 | 22 | #include <math.h> |
9277c064 | 23 | #include <math_private.h> |
f7eac6eb | 24 | |
f7eac6eb | 25 | #ifdef __STDC__ |
e852e889 | 26 | double __tgamma(double x) |
f7eac6eb | 27 | #else |
e852e889 | 28 | double __tgamma(x) |
f7eac6eb RM |
29 | double x; |
30 | #endif | |
31 | { | |
d705269e | 32 | double y; |
e852e889 UD |
33 | int local_signgam; |
34 | y = __ieee754_gamma_r(x,&local_signgam); | |
35 | if (local_signgam < 0) y = -y; | |
f7eac6eb | 36 | #ifdef _IEEE_LIBM |
e852e889 | 37 | return y; |
f7eac6eb | 38 | #else |
e852e889 | 39 | if(_LIB_VERSION == _IEEE_) return y; |
cc60175e | 40 | |
e852e889 | 41 | if(!__finite(y)&&__finite(x)) { |
52495f29 UD |
42 | if (x == 0.0) |
43 | return __kernel_standard(x,x,50); /* tgamma pole */ | |
44 | else if(__floor(x)==x&&x<0.0) | |
45 | return __kernel_standard(x,x,41); /* tgamma domain */ | |
e852e889 UD |
46 | else |
47 | return __kernel_standard(x,x,40); /* tgamma overflow */ | |
48 | } | |
cc60175e | 49 | return y; |
f7eac6eb | 50 | #endif |
30de3b18 | 51 | } |
e852e889 | 52 | weak_alias (__tgamma, tgamma) |
cccda09f | 53 | #ifdef NO_LONG_DOUBLE |
e852e889 UD |
54 | strong_alias (__tgamma, __tgammal) |
55 | weak_alias (__tgamma, tgammal) | |
cccda09f | 56 | #endif |