1/* w_expf.c -- float version of w_exp.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_expf.c,v 1.6 2002/05/26 22:02:00 wiz Exp $");
19#endif
20
21/*
22 * wrapper expf(x)
23 */
24
25#include "namespace.h"
26#include "math.h"
27#include "math_private.h"
28
29#ifdef __weak_alias
30__weak_alias(expf, _expf)
31#endif
32
33static const float
34o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
35u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
36
37float
38expf(float x)		/* wrapper expf */
39{
40#ifdef _IEEE_LIBM
41	return __ieee754_expf(x);
42#else
43	float z;
44	z = __ieee754_expf(x);
45	if(_LIB_VERSION == _IEEE_) return z;
46	if(finitef(x)) {
47	    if(x>o_threshold)
48	        /* exp overflow */
49	        return (float)__kernel_standard((double)x,(double)x,106);
50	    else if(x<u_threshold)
51	        /* exp underflow */
52	        return (float)__kernel_standard((double)x,(double)x,107);
53	}
54	return z;
55#endif
56}
57