projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |