Use __builtin_fma more in dbl-64 code.
[glibc.git] / math / w_lgammal_main.c
blobc3c41f6fff4f91910d1591c47150f523b73333df
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 /* long double lgammal(long double x)
18 * Return the logarithm of the Gamma function of x.
20 * Method: call __ieee754_lgammal_r
23 #include <math.h>
24 #include <math_private.h>
26 #include <lgamma-compat.h>
28 #if BUILD_LGAMMA
29 long double
30 LGFUNC (__lgammal) (long double x)
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 */
40 return y;
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 # endif
47 # if GAMMA_ALIAS
48 strong_alias (LGFUNC (__lgammal), __gammal)
49 weak_alias (__gammal, gammal)
50 # endif
51 #endif