1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/* w_gammal.c -- long double version of w_gamma.c.
* Conversion to long double by Ulrich Drepper,
* Cygnus Support, drepper@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/* long double gammal(double x)
* Return the Gamma function of x.
*/
#include <math.h>
#include "math_private.h"
#if defined(__UCLIBC_HAS_FENV__)
#include <errno.h>
#endif
#if !defined __NO_LONG_DOUBLE_MATH
long double
tgammal(long double x)
{
# if defined(__UCLIBC_HAS_FENV__)
long double y = (long double) __ieee754_tgamma((long double)x);
if(__builtin_expect (!isfinite (y) || y == 0, 0)
&& (isfinite (x) || (isinf (x) && x < 0.0))
&& _LIB_VERSION != _IEEE_) {
if(x==0.0)
return __kernel_standard_l(x,x,250); /* tgamma pole */
else if(floorl(x)==x&&x<0.0L)
return __kernel_standard_l(x,x,241); /* tgamma domain */
else if (y == 0)
__set_errno (ERANGE); /* tgamma underflow */
else
return __kernel_standard_l(x,x,240); /* tgamma overflow */
}
return y;
# else
return (long double) __ieee754_tgamma((long double)x);
# endif /* __UCLIBC_HAS_FENV__ */
}
#endif /* __NO_LONG_DOUBLE_MATH */
|
