1 /* w_log10f.c -- float version of w_log10.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
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 * ====================================================
14 */
15
16 #include <sys/cdefs.h>
17 #if defined(LIBM_SCCS) && !defined(lint)
18 __RCSID("$NetBSD: w_log2f.c,v 1.2 2024/07/16 14:52:50 riastradh Exp $");
19 #endif
20
21 /*
22 * wrapper log2f(X)
23 */
24
25 #include "namespace.h"
26
27 #include "math.h"
28 #include "math_private.h"
29
__weak_alias(log2f,_log2f)30 __weak_alias(log2f, _log2f)
31 float
32 log2f(float x) /* wrapper log2f */
33 {
34 #ifdef _IEEE_LIBM
35 return __ieee754_log2f(x);
36 #else
37 float z;
38 z = __ieee754_log2f(x);
39 if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
40 if(x<=(float)0.0) {
41 if(x==(float)0.0)
42 /* log2(0) */
43 return (float)__kernel_standard((double)x,(double)x,148);
44 else
45 /* log2(x<0) */
46 return (float)__kernel_standard((double)x,(double)x,149);
47 } else
48 return z;
49 #endif
50 }
51