1  /* @(#)w_lgamma.c 5.1 93/09/24 */
       2  /*
       3   * ====================================================
       4   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
       5   *
       6   * Developed at SunPro, a Sun Microsystems, Inc. business.
       7   * Permission to use, copy, modify, and distribute this
       8   * software is freely granted, provided that this notice
       9   * is preserved.
      10   * ====================================================
      11   */
      12  
      13  /* double lgamma(double x)
      14   * Return the logarithm of the Gamma function of x.
      15   *
      16   * Method: call __ieee754_lgamma_r
      17   */
      18  
      19  #include <math.h>
      20  #include <math_private.h>
      21  #include <math-svid-compat.h>
      22  #include <libm-alias-double.h>
      23  
      24  #include <lgamma-compat.h>
      25  
      26  #if BUILD_LGAMMA
      27  double
      28  LGFUNC (__lgamma) (double x)
      29  {
      30  	double y = CALL_LGAMMA (double, __ieee754_lgamma_r, x);
      31  	if(__builtin_expect(!isfinite(y), 0)
      32  	   && isfinite(x) && _LIB_VERSION != _IEEE_)
      33  		return __kernel_standard(x, x,
      34  					 floor(x)==x&&x<=0.0
      35  					 ? 15 /* lgamma pole */
      36  					 : 14); /* lgamma overflow */
      37  
      38  	return y;
      39  }
      40  # if USE_AS_COMPAT
      41  compat_symbol (libm, __lgamma_compat, lgamma, LGAMMA_OLD_VER);
      42  #  ifdef NO_LONG_DOUBLE
      43  strong_alias (__lgamma_compat, __lgammal_compat)
      44  compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);
      45  #  endif
      46  # else
      47  versioned_symbol (libm, __lgamma, lgamma, LGAMMA_NEW_VER);
      48  #  ifdef NO_LONG_DOUBLE
      49  strong_alias (__lgamma, __lgammal)
      50  versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);
      51  #  endif
      52  libm_alias_double_other (__lgamma, lgamma)
      53  # endif
      54  # if GAMMA_ALIAS
      55  strong_alias (LGFUNC (__lgamma), __gamma)
      56  weak_alias (__gamma, gamma)
      57  #  ifdef NO_LONG_DOUBLE
      58  strong_alias (__gamma, __gammal)
      59  weak_alias (__gamma, gammal)
      60  #  endif
      61  # endif
      62  #endif