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
22float
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}
46libm_alias_float (__tgamma, tgamma)
47#endif
48

source code of glibc/math/w_tgammaf_compat.c