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       ---
       w_exp.c (1146B)
       ---
            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 #ifndef lint
           14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_exp.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           15 #endif
           16 
           17 /*
           18  * wrapper exp(x)
           19  */
           20 
           21 #include "math.h"
           22 #include "math_private.h"
           23 
           24 static const double
           25 o_threshold=  7.09782712893383973096e+02,  /* 0x40862E42, 0xFEFA39EF */
           26 u_threshold= -7.45133219101941108420e+02;  /* 0xc0874910, 0xD52D3051 */
           27 
           28 double
           29 exp(double x)                /* wrapper exp */
           30 {
           31 #ifdef _IEEE_LIBM
           32         return __ieee754_exp(x);
           33 #else
           34         double z;
           35         z = __ieee754_exp(x);
           36         if(_LIB_VERSION == _IEEE_) return z;
           37         if(finite(x)) {
           38             if(x>o_threshold)
           39                 return __kernel_standard(x,x,6); /* exp overflow */
           40             else if(x<u_threshold)
           41                 return __kernel_standard(x,x,7); /* exp underflow */
           42         }
           43         return z;
           44 #endif
           45 }