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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: w_expf.c,v 1.3 1995/05/10 20:48:53 jtc Exp $";
18#endif
19
20/*
21 * wrapper expf(x)
22 */
23
24#include "math.h"
25#include "math_private.h"
26
27#ifdef __STDC__
28static const float
29#else
30static float
31#endif
32o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
33u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
34
35#ifdef __STDC__
36	float __expf(float x)		/* wrapper expf */
37#else
38	float __expf(x)			/* wrapper expf */
39	float x;
40#endif
41{
42#ifdef _IEEE_LIBM
43	return __ieee754_expf(x);
44#else
45	float z;
46	z = __ieee754_expf(x);
47	if(_LIB_VERSION == _IEEE_) return z;
48	if(__finitef(x)) {
49	    if(x>o_threshold)
50	        /* exp overflow */
51	        return (float)__kernel_standard((double)x,(double)x,106);
52	    else if(x<u_threshold)
53	        /* exp underflow */
54	        return (float)__kernel_standard((double)x,(double)x,107);
55	}
56	return z;
57#endif
58}
59weak_alias (__expf, expf)
60