mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 04:01:10 +00:00
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* w_lgammal.c -- long double version of w_lgamma.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 lgammal(long double x)
|
|
* Return the logarithm of the Gamma function of x.
|
|
*
|
|
* Method: call __ieee754_lgammal_r
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
|
|
long double
|
|
__lgammal(long double x)
|
|
{
|
|
int local_signgam = 0;
|
|
long double y = __ieee754_lgammal_r(x,
|
|
_LIB_VERSION != _ISOC_
|
|
/* ISO C99 does not define the
|
|
global variable. */
|
|
? &signgam
|
|
: &local_signgam);
|
|
if(__builtin_expect(!isfinite(y), 0)
|
|
&& isfinite(x) && _LIB_VERSION != _IEEE_)
|
|
return __kernel_standard_l(x, x,
|
|
__floorl(x)==x&&x<=0.0L
|
|
? 215 /* lgamma pole */
|
|
: 214); /* lgamma overflow */
|
|
|
|
return y;
|
|
}
|
|
weak_alias (__lgammal, lgammal)
|
|
strong_alias (__lgammal, __gammal)
|
|
weak_alias (__gammal, gammal)
|