1/* @(#)w_exp.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13#include <sys/cdefs.h>
14#if defined(LIBM_SCCS) && !defined(lint)
15__RCSID("$NetBSD: w_exp.c,v 1.9 2002/05/26 22:02:00 wiz Exp $");
16#endif
17
18/*
19 * wrapper exp(x)
20 */
21
22#include "namespace.h"
23#include "math.h"
24#include "math_private.h"
25
26#ifdef __weak_alias
27__weak_alias(exp, _exp)
28#endif
29
30static const double
31o_threshold=  7.09782712893383973096e+02,  /* 0x40862E42, 0xFEFA39EF */
32u_threshold= -7.45133219101941108420e+02;  /* 0xc0874910, 0xD52D3051 */
33
34double
35exp(double x)		/* wrapper exp */
36{
37#ifdef _IEEE_LIBM
38	return __ieee754_exp(x);
39#else
40	double z;
41	z = __ieee754_exp(x);
42	if(_LIB_VERSION == _IEEE_) return z;
43	if(finite(x)) {
44	    if(x>o_threshold)
45	        return __kernel_standard(x,x,6); /* exp overflow */
46	    else if(x<u_threshold)
47	        return __kernel_standard(x,x,7); /* exp underflow */
48	}
49	return z;
50#endif
51}
52