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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 | ||
f7eac6eb | 13 | /* double gamma(double x) |
d705269e UD |
14 | * Return the logarithm of the Gamma function of x or the Gamma function of x, |
15 | * depending on the library mode. | |
f7eac6eb RM |
16 | */ |
17 | ||
e47cc4e0 | 18 | #include <errno.h> |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
813378e9 | 21 | #include <math-svid-compat.h> |
9ac44708 | 22 | #include <libm-alias-double.h> |
f7eac6eb | 23 | |
4f3647e4 | 24 | #if LIBM_SVID_COMPAT |
0ac5ae23 UD |
25 | double |
26 | __tgamma(double x) | |
f7eac6eb | 27 | { |
e852e889 | 28 | int local_signgam; |
0ac5ae23 | 29 | double y = __ieee754_gamma_r(x,&local_signgam); |
cc60175e | 30 | |
d81f90cc | 31 | if(__glibc_unlikely (!isfinite (y) || y == 0) |
89faa034 | 32 | && (isfinite (x) || (isinf (x) && x < 0.0)) |
0ac5ae23 | 33 | && _LIB_VERSION != _IEEE_) { |
52495f29 UD |
34 | if (x == 0.0) |
35 | return __kernel_standard(x,x,50); /* tgamma pole */ | |
e44acb20 | 36 | else if(floor(x)==x&&x<0.0) |
52495f29 | 37 | return __kernel_standard(x,x,41); /* tgamma domain */ |
e47cc4e0 JM |
38 | else if (y == 0) |
39 | __set_errno (ERANGE); /* tgamma underflow */ | |
e852e889 UD |
40 | else |
41 | return __kernel_standard(x,x,40); /* tgamma overflow */ | |
42 | } | |
0ac5ae23 | 43 | return local_signgam < 0 ? -y : y; |
30de3b18 | 44 | } |
9ac44708 | 45 | libm_alias_double (__tgamma, tgamma) |
cccda09f | 46 | #endif |