w_lgamma.c - vx32 - Local 9vx git repository for patches.
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       ---
       w_lgamma.c (1198B)
       ---
            1 /* @(#)w_lgamma.c 5.1 93/09/24 */
            2 /*
            3  * ====================================================
            4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
            5  *
            6  * Developed at SunPro, a Sun Microsystems, Inc. business.
            7  * Permission to use, copy, modify, and distribute this
            8  * software is freely granted, provided that this notice
            9  * is preserved.
           10  * ====================================================
           11  */
           12 
           13 #ifndef lint
           14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_lgamma.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           15 #endif
           16 
           17 /* double lgamma(double x)
           18  * Return the logarithm of the Gamma function of x.
           19  *
           20  * Method: call __ieee754_lgamma_r
           21  */
           22 
           23 #include "math.h"
           24 #include "math_private.h"
           25 
           26 extern int signgam;
           27 
           28 double
           29 lgamma(double x)
           30 {
           31 #ifdef _IEEE_LIBM
           32         return __ieee754_lgamma_r(x,&signgam);
           33 #else
           34         double y;
           35         y = __ieee754_lgamma_r(x,&signgam);
           36         if(_LIB_VERSION == _IEEE_) return y;
           37         if(!finite(y)&&finite(x)) {
           38             if(floor(x)==x&&x<=0.0)
           39                 return __kernel_standard(x,x,15); /* lgamma pole */
           40             else
           41                 return __kernel_standard(x,x,14); /* lgamma overflow */
           42         } else
           43             return y;
           44 #endif
           45 }