math/w_lgammal_main.c

   1 /* w_lgammal.c -- long double version of w_lgamma.c.
   2  */
   3
   4 /*
   5  * ====================================================
   6  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   7  *
   8  * Developed at SunPro, a Sun Microsystems, Inc. business.
   9  * Permission to use, copy, modify, and distribute this
  10  * software is freely granted, provided that this notice
  11  * is preserved.
  12  * ====================================================
  13  */
  14
  15 /* long double lgammal(long double x)
  16  * Return the logarithm of the Gamma function of x.
  17  *
  18  * Method: call __ieee754_lgammal_r
  19  */
  20
  21 #include <math.h>
  22 #include <math_private.h>
  23 #include <math-svid-compat.h>
  24 #include <libm-alias-ldouble.h>
  25
  26 #include <lgamma-compat.h>
  27
  28 #if BUILD_LGAMMA
  29 long double
  30 LGFUNC (__lgammal) (long double x)
  31 {
  32         long double y = CALL_LGAMMA (long double, __ieee754_lgammal_r, x);
  33         if(__builtin_expect(!isfinite(y), 0)
  34            && isfinite(x) && _LIB_VERSION != _IEEE_)
  35                 return __kernel_standard_l(x, x,
  36                                            floorl(x)==x&&x<=0.0L
  37                                            ? 215 /* lgamma pole */
  38                                            : 214); /* lgamma overflow */
  39
  40         return y;
  41 }
  42 # if USE_AS_COMPAT
  43 compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);
  44 # else
  45 versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);
  46 libm_alias_ldouble_other (__lgamma, lgamma)
  47 # endif
  48 # if GAMMA_ALIAS
  49 strong_alias (LGFUNC (__lgammal), __gammal)
  50 weak_alias (__gammal, gammal)
  51 # endif
  52 #endif