| /* @(#)w_lgamma.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. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $"; |
| #endif |
| |
| /* double lgamma(double x) |
| * Return the logarithm of the Gamma function of x. |
| * |
| * Method: call __ieee754_lgamma_r |
| */ |
| |
| #include <math.h> |
| #include "math_private.h" |
| |
| #ifdef __STDC__ |
| double __lgamma(double x) |
| #else |
| double __lgamma(x) |
| double x; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_lgamma_r(x,&signgam); |
| #else |
| double y; |
| int local_signgam = 0; |
| y = __ieee754_lgamma_r(x,&local_signgam); |
| if (_LIB_VERSION != _ISOC_) |
| /* ISO C99 does not define the global variable. */ |
| signgam = local_signgam; |
| if(_LIB_VERSION == _IEEE_) return y; |
| if(!__finite(y)&&__finite(x)) { |
| if(__floor(x)==x&&x<=0.0) |
| return __kernel_standard(x,x,15); /* lgamma pole */ |
| else |
| return __kernel_standard(x,x,14); /* lgamma overflow */ |
| } else |
| return y; |
| #endif |
| } |
| weak_alias (__lgamma, lgamma) |
| strong_alias (__lgamma, __gamma) |
| weak_alias (__gamma, gamma) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__lgamma, __lgammal) |
| weak_alias (__lgamma, lgammal) |
| strong_alias (__gamma, __gammal) |
| weak_alias (__gamma, gammal) |
| #endif |
