math/w_tgammal.c

   1 /* w_gammal.c -- long double version of w_gamma.c.
   2  * Conversion to long double by Ulrich Drepper,
   3  * Cygnus Support, drepper@cygnus.com.
   4  */
   5
   6 /*
   7  * ====================================================
   8  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   9  *
  10  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11  * Permission to use, copy, modify, and distribute this
  12  * software is freely granted, provided that this notice
  13  * is preserved.
  14  * ====================================================
  15  */
  16
  17 /* long double gammal(double x)
  18  * Return the Gamma function of x.
  19  */
  20
  21 #include <math.h>
  22 #include <math_private.h>
  23
  24 long double
  25 __tgammal(long double x)
  26 {
  27         int local_signgam;
  28         long double y = __ieee754_gammal_r(x,&local_signgam);
  29
  30         if(__builtin_expect(!__finitel(y), 0)
  31            && (__finitel (x) || __isinfl (x) < 0)
  32            && _LIB_VERSION != _IEEE_) {
  33           if(x==0.0)
  34             return __kernel_standard_l(x,x,250); /* tgamma pole */
  35           else if(__floorl(x)==x&&x<0.0L)
  36             return __kernel_standard_l(x,x,241); /* tgamma domain */
  37           else
  38             return __kernel_standard_l(x,x,240); /* tgamma overflow */
  39         }
  40         return local_signgam < 0 ? - y : y;
  41 }
  42 weak_alias (__tgammal, tgammal)