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/* @(#)w_exp.c 5.1 93/09/24 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#ifndef lint
static char rcsid
[] = "$\Id: w_exp.c,v 1.2 1995/05/30 05:50:58 rgrimes Exp $";
#endif
/*
* wrapper exp(x)
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
static const double
#else
static double
#endif
o_threshold
= 7.09782712893383973096e+02, /* 0x40862E42, 0xFEFA39EF */
u_threshold
= -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */
#ifdef __STDC__
double exp(double x
) /* wrapper exp */
#else
double exp(x
) /* wrapper exp */
double x
;
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_exp
(x
);
#else
double z
;
z
= __ieee754_exp
(x
);
if(_LIB_VERSION
== _IEEE_
) return z
;
if(finite
(x
)) {
if(x
>o_threshold
)
return __kernel_standard
(x
,x
,6); /* exp overflow */
else if(x
<u_threshold
)
return __kernel_standard
(x
,x
,7); /* exp underflow */
}
return z
;
#endif
}