projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| e852e889 UD |
1 | /* w_gammal.c -- long double version of w_gamma.c. |
| 2 | * Conversion to long double by Ulrich Drepper, | |
| 3 | * Cygnus Support, drepper@cygnus.com. | |
| 4 | */ | |
| 5 | ||
| 6 | /* | |
| 7 | * ==================================================== | |
| 8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| 9 | * | |
| 10 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| 11 | * Permission to use, copy, modify, and distribute this | |
| 12 | * software is freely granted, provided that this notice | |
| 13 | * is preserved. | |
| 14 | * ==================================================== | |
| 15 | */ | |
| 16 | ||
| e852e889 UD |
17 | /* long double gammal(double x) |
| 18 | * Return the Gamma function of x. | |
| 19 | */ | |
| 20 | ||
| e47cc4e0 | 21 | #include <errno.h> |
| 9d13fb24 | 22 | #include <math.h> |
| 9277c064 | 23 | #include <math_private.h> |
| e852e889 | 24 | |
| 0ac5ae23 UD |
25 | long double |
| 26 | __tgammal(long double x) | |
| e852e889 | 27 | { |
| e852e889 | 28 | int local_signgam; |
| 0ac5ae23 | 29 | long double y = __ieee754_gammal_r(x,&local_signgam); |
| e852e889 | 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 | 34 | if(x==0.0) |
| 41bf21a1 | 35 | return __kernel_standard_l(x,x,250); /* tgamma pole */ |
| 0ac5ae23 | 36 | else if(__floorl(x)==x&&x<0.0L) |
| 41bf21a1 | 37 | return __kernel_standard_l(x,x,241); /* tgamma domain */ |
| e47cc4e0 JM |
38 | else if (y == 0) |
| 39 | __set_errno (ERANGE); /* tgamma underflow */ | |
| e852e889 | 40 | else |
| 41bf21a1 | 41 | return __kernel_standard_l(x,x,240); /* tgamma overflow */ |
| e852e889 | 42 | } |
| 0ac5ae23 | 43 | return local_signgam < 0 ? - y : y; |
| e852e889 UD |
44 | } |
| 45 | weak_alias (__tgammal, tgammal) |