1 | /* w_gammaf.c -- float version of w_gamma.c. |
2 | */ |
3 | |
4 | /* |
5 | * ==================================================== |
6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
7 | * |
8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
9 | * Permission to use, copy, modify, and distribute this |
10 | * software is freely granted, provided that this notice |
11 | * is preserved. |
12 | * ==================================================== |
13 | */ |
14 | |
15 | #include <errno.h> |
16 | #include <math.h> |
17 | #include <math_private.h> |
18 | #include <math-svid-compat.h> |
19 | #include <libm-alias-float.h> |
20 | |
21 | #if LIBM_SVID_COMPAT |
22 | float |
23 | __tgammaf(float x) |
24 | { |
25 | int local_signgam; |
26 | float y = __ieee754_gammaf_r(x,&local_signgam); |
27 | |
28 | if(__glibc_unlikely (!isfinite (y) || y == 0) |
29 | && (isfinite (x) || (isinf (x) && x < 0.0)) |
30 | && _LIB_VERSION != _IEEE_) { |
31 | if (x == (float)0.0) |
32 | /* tgammaf pole */ |
33 | return __kernel_standard_f(x, x, 150); |
34 | else if(floorf(x)==x&&x<0.0f) |
35 | /* tgammaf domain */ |
36 | return __kernel_standard_f(x, x, 141); |
37 | else if (y == 0) |
38 | /* tgammaf underflow */ |
39 | __set_errno (ERANGE); |
40 | else |
41 | /* tgammaf overflow */ |
42 | return __kernel_standard_f(x, x, 140); |
43 | } |
44 | return local_signgam < 0 ? - y : y; |
45 | } |
46 | libm_alias_float (__tgamma, tgamma) |
47 | #endif |
48 | |