math/w_lgammal_main.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 /* long double lgammal(long double x)
  18  * Return the logarithm of the Gamma function of x.
  19  *
  20  * Method: call __ieee754_lgammal_r
  21  */
  22
  23 #include <math.h>
  24 #include <math_private.h>
  25 #include <math-svid-compat.h>
  26 #include <libm-alias-ldouble.h>
  27
  28 #include <lgamma-compat.h>
  29
  30 #if BUILD_LGAMMA
  31 long double
  32 LGFUNC (__lgammal) (long double x)
  33 {
  34         long double y = CALL_LGAMMA (long double, __ieee754_lgammal_r, x);
  35         if(__builtin_expect(!isfinite(y), 0)
  36            && isfinite(x) && _LIB_VERSION != _IEEE_)
  37                 return __kernel_standard_l(x, x,
  38                                            floorl(x)==x&&x<=0.0L
  39                                            ? 215 /* lgamma pole */
  40                                            : 214); /* lgamma overflow */
  41
  42         return y;
  43 }
  44 # if USE_AS_COMPAT
  45 compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);
  46 # else
  47 versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);
  48 libm_alias_ldouble_other (__lgamma, lgamma)
  49 # endif
  50 # if GAMMA_ALIAS
  51 strong_alias (LGFUNC (__lgammal), __gammal)
  52 weak_alias (__gammal, gammal)
  53 # endif
  54 #endif