sysdeps/libm-ieee754/w_gammal.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 #if defined(LIBM_SCCS) && !defined(lint)
  18 static char rcsid[] = "$NetBSD: $";
  19 #endif
  20
  21 /* long double gammal(double x)
  22  * Return the Gamma function of x.
  23  */
  24
  25 #include "math.h"
  26 #include "math_private.h"
  27
  28 #ifdef __STDC__
  29         long double __gammal(long double x)
  30 #else
  31         long double __gammal(x)
  32         long double x;
  33 #endif
  34 {
  35         long double y;
  36 #ifndef _IEEE_LIBM
  37         if (_LIB_VERSION == _SVID_)
  38           {
  39             y = __ieee754_lgammal_r(x,&signgam);
  40
  41             if(!__finitel(y)&&__finitel(x)) {
  42               if(__floorl(x)==x&&x<=(long double)0.0)
  43                 /* lgamma pole */
  44                 return (long double)__kernel_standard((double)x,(double)x,15);
  45               else
  46                 /* lgamma overflow */
  47                 return (long double)__kernel_standard((double)x,(double)x,14);
  48             }
  49           }
  50         else
  51           {
  52 #endif
  53             int local_signgam;
  54             y = __ieee754_gammal_r(x,&local_signgam);
  55             if (local_signgam < 0) y = -y;
  56 #ifdef _IEEE_LIBM
  57             return y;
  58 #else
  59             if(_LIB_VERSION == _IEEE_) return y;
  60
  61             if(!__finitel(y)&&__finitel(x)) {
  62               if(__floorl(x)==x&&x<=0.0)
  63                 return __kernel_standard(x,x,241); /* gamma pole */
  64               else
  65                 return __kernel_standard(x,x,240); /* gamma overflow */
  66             }
  67           }
  68         return y;
  69 #endif
  70 }
  71 weak_alias (__gammal, gammal)