compiler/mlib/w_gamma_r.c

   1 /* @(#)wr_gamma.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_gamma_r.c,v 1.5 1999/08/28 00:07:01 peter Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper double gamma_r(double x, int *signgamp)
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24
  25 #ifdef __STDC__
  26         double gamma_r(double x, int *signgamp) /* wrapper lgamma_r */
  27 #else
  28         double gamma_r(x,signgamp)              /* wrapper lgamma_r */
  29         double x; int *signgamp;
  30 #endif
  31 {
  32 #ifdef _IEEE_LIBM
  33         return __ieee754_gamma_r(x,signgamp);
  34 #else
  35         double y;
  36         y = __ieee754_gamma_r(x,signgamp);
  37         if(_LIB_VERSION == _IEEE_) return y;
  38         if(!finite(y)&&finite(x)) {
  39             if(floor(x)==x&&x<=0.0)
  40                 return __kernel_standard(x,x,41); /* gamma pole */
  41             else
  42                 return __kernel_standard(x,x,40); /* gamma overflow */
  43         } else
  44             return y;
  45 #endif
  46 }