/* @(#)w_lgamma.c 5.1 93/09/24 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

/* double lgamma(double x)

 * Return the logarithm of the Gamma function of x.

 *

 * Method: call __ieee754_lgamma_r

 */

#include <math.h>

#include <math_private.h>

#include <math-svid-compat.h>

#include <libm-alias-double.h>

#include <lgamma-compat.h>

#if BUILD_LGAMMA

double

LGFUNC (__lgamma) (double x)

{

	double y = CALL_LGAMMA (double, __ieee754_lgamma_r, x);

	if(__builtin_expect(!isfinite(y), 0)

	   && isfinite(x) && _LIB_VERSION != _IEEE_)

		return __kernel_standard(x, x,

					 __floor(x)==x&&x<=0.0

					 ? 15 /* lgamma pole */

					 : 14); /* lgamma overflow */

	return y;

}

# if USE_AS_COMPAT

compat_symbol (libm, __lgamma_compat, lgamma, LGAMMA_OLD_VER);

#  ifdef NO_LONG_DOUBLE

strong_alias (__lgamma_compat, __lgammal_compat)

compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER);

#  endif

# else

versioned_symbol (libm, __lgamma, lgamma, LGAMMA_NEW_VER);

#  ifdef NO_LONG_DOUBLE

strong_alias (__lgamma, __lgammal)

versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER);

#  endif

libm_alias_double_other (__lgamma, lgamma)

# endif

# if GAMMA_ALIAS

strong_alias (LGFUNC (__lgamma), __gamma)

weak_alias (__gamma, gamma)

#  ifdef NO_LONG_DOUBLE

strong_alias (__gamma, __gammal)

weak_alias (__gamma, gammal)

#  endif

# endif

#endif