1 | /* w_gammaf.c -- float version of w_gamma.c. |
2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
3 | */ |
4 | |
5 | /* |
6 | * ==================================================== |
7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
8 | * |
9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
10 | * Permission to use, copy, modify, and distribute this |
11 | * software is freely granted, provided that this notice |
12 | * is preserved. |
13 | * ==================================================== |
14 | */ |
15 | |
16 | #include <errno.h> |
17 | #include <math.h> |
18 | #include <math_private.h> |
19 | |
20 | float |
21 | __tgammaf(float x) |
22 | { |
23 | int local_signgam; |
24 | float y = __ieee754_gammaf_r(x,&local_signgam); |
25 | |
26 | if(__glibc_unlikely (!isfinite (y) || y == 0) |
27 | && (isfinite (x) || (isinf (x) && x < 0.0)) |
28 | && _LIB_VERSION != _IEEE_) { |
29 | if (x == (float)0.0) |
30 | /* tgammaf pole */ |
31 | return __kernel_standard_f(x, x, 150); |
32 | else if(__floorf(x)==x&&x<0.0f) |
33 | /* tgammaf domain */ |
34 | return __kernel_standard_f(x, x, 141); |
35 | else if (y == 0) |
36 | /* tgammaf underflow */ |
37 | __set_errno (ERANGE); |
38 | else |
39 | /* tgammaf overflow */ |
40 | return __kernel_standard_f(x, x, 140); |
41 | } |
42 | return local_signgam < 0 ? - y : y; |
43 | } |
44 | weak_alias (__tgammaf, tgammaf) |
45 | |