mirror of https://gitee.com/openkylin/glibc.git
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
|
/* w_gammal.c -- long double version of w_gamma.c.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ====================================================
|
||
|
|
* 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 <errno.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <math_private.h>
|
||
|
|
#include <math-svid-compat.h>
|
||
|
|
#include <libm-alias-ldouble.h>
|
||
|
|
|
||
|
|
#if LIBM_SVID_COMPAT
|
||
|
|
long double
|
||
|
|
__tgammal(long double x)
|
||
|
|
{
|
||
|
|
int local_signgam;
|
||
|
|
long double y = __ieee754_gammal_r(x,&local_signgam);
|
||
|
|
|
||
|
|
if(__glibc_unlikely (!isfinite (y) || y == 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 local_signgam < 0 ? - y : y;
|
||
|
|
}
|
||
|
|
libm_alias_ldouble (__tgamma, tgamma)
|
||
|
|
#endif
|