sysdeps/generic/w_lgammal.c

   1 /* w_lgammal.c -- long double version of w_lgamma.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 lgammal(long double x)
  22  * Return the logarithm of the Gamma function of x.
  23  *
  24  * Method: call __ieee754_lgammal_r
  25  */
  26
  27 #include "math.h"
  28 #include "math_private.h"
  29
  30 #ifdef __STDC__
  31         long double __lgammal(long double x)
  32 #else
  33         long double __lgammal(x)
  34         long double x;
  35 #endif
  36 {
  37 #ifdef _IEEE_LIBM
  38         return __ieee754_lgammal_r(x,&signgam);
  39 #else
  40         long double y;
  41         int local_signgam = 0;
  42         y = __ieee754_lgammal_r(x,&local_signgam);
  43         if (_LIB_VERSION != _ISOC_)
  44           /* ISO C99 does not define the global variable.  */
  45           signgam = local_signgam;
  46         if(_LIB_VERSION == _IEEE_) return y;
  47         if(!__finitel(y)&&__finitel(x)) {
  48             if(__floorl(x)==x&&x<=0.0)
  49                 return __kernel_standard(x,x,215); /* lgamma pole */
  50             else
  51                 return __kernel_standard(x,x,214); /* lgamma overflow */
  52         } else
  53             return y;
  54 #endif
  55 }
  56 weak_alias (__lgammal, lgammal)
  57 strong_alias (__lgammal, __gammal)
  58 weak_alias (__gammal, gammal)