/* @(#)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[] = "$NetBSD: w_exp.c,v 1.6 1995/05/10 20:48:51 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 }