Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/math/w_tgamma.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
46 lines (42 sloc)
1.29 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* @(#)w_gamma.c 5.1 93/09/24 */ | |
/* | |
* ==================================================== | |
* 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. | |
* ==================================================== | |
*/ | |
/* double gamma(double x) | |
* Return the logarithm of the Gamma function of x or the Gamma function of x, | |
* depending on the library mode. | |
*/ | |
#include <errno.h> | |
#include <math.h> | |
#include <math_private.h> | |
double | |
__tgamma(double x) | |
{ | |
int local_signgam; | |
double y = __ieee754_gamma_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(x,x,50); /* tgamma pole */ | |
else if(__floor(x)==x&&x<0.0) | |
return __kernel_standard(x,x,41); /* tgamma domain */ | |
else if (y == 0) | |
__set_errno (ERANGE); /* tgamma underflow */ | |
else | |
return __kernel_standard(x,x,40); /* tgamma overflow */ | |
} | |
return local_signgam < 0 ? -y : y; | |
} | |
weak_alias (__tgamma, tgamma) | |
#ifdef NO_LONG_DOUBLE | |
strong_alias (__tgamma, __tgammal) | |
weak_alias (__tgamma, tgammal) | |
#endif |