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[glibc/history.git] / math / w_lgammal.c
blobf250e50388e79a87a5b849803a904afef0fdd2ee
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 */
6 /*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 * ====================================================
17 #if defined(LIBM_SCCS) && !defined(lint)
18 static char rcsid[] = "$NetBSD: $";
19 #endif
21 /* long double lgammal(long double x)
22 * Return the logarithm of the Gamma function of x.
24 * Method: call __ieee754_lgammal_r
27 #include <math.h>
28 #include "math_private.h"
30 #ifdef __STDC__
31 long double __lgammal(long double x)
32 #else
33 long double __lgammal(x)
34 long double x;
35 #endif
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
56 weak_alias (__lgammal, lgammal)
57 strong_alias (__lgammal, __gammal)
58 weak_alias (__gammal, gammal)