Use __builtin_fma more in dbl-64 code.
[glibc.git] / math / w_tgammaf.c
blobdfce894cc8878dc46a9ef59dddd9681fff7a3144
1 /* w_gammaf.c -- float version of w_gamma.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
16 #include <errno.h>
17 #include <math.h>
18 #include <math_private.h>
20 float
21 __tgammaf(float x)
23 int local_signgam;
24 float y = __ieee754_gammaf_r(x,&local_signgam);
26 if(__glibc_unlikely (!isfinite (y) || y == 0)
27 && (isfinite (x) || (isinf (x) && x < 0.0))
28 && _LIB_VERSION != _IEEE_) {
29 if (x == (float)0.0)
30 /* tgammaf pole */
31 return __kernel_standard_f(x, x, 150);
32 else if(__floorf(x)==x&&x<0.0f)
33 /* tgammaf domain */
34 return __kernel_standard_f(x, x, 141);
35 else if (y == 0)
36 /* tgammaf underflow */
37 __set_errno (ERANGE);
38 else
39 /* tgammaf overflow */
40 return __kernel_standard_f(x, x, 140);
42 return local_signgam < 0 ? - y : y;
44 weak_alias (__tgammaf, tgammaf)