0,0 → 1,54 |
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
/* @(#)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. |
* ==================================================== |
*/ |
|
#if defined(LIBM_SCCS) && !defined(lint) |
static char rcsid[] = "$Id: w_exp.c,v 1.4 1994/08/10 20:34:00 jtc 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 |
} |