w_expf.c - vx32 - Local 9vx git repository for patches.
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       ---
       w_expf.c (1264B)
       ---
            1 /* w_expf.c -- float version of w_exp.c.
            2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
            3  */
            4 
            5 /*
            6  * ====================================================
            7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
            8  *
            9  * Developed at SunPro, a Sun Microsystems, Inc. business.
           10  * Permission to use, copy, modify, and distribute this
           11  * software is freely granted, provided that this notice
           12  * is preserved.
           13  * ====================================================
           14  */
           15 
           16 #ifndef lint
           17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_expf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           18 #endif
           19 
           20 /*
           21  * wrapper expf(x)
           22  */
           23 
           24 #include "math.h"
           25 #include "math_private.h"
           26 
           27 static const float
           28 o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
           29 u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
           30 
           31 float
           32 expf(float x)                /* wrapper expf */
           33 {
           34 #ifdef _IEEE_LIBM
           35         return __ieee754_expf(x);
           36 #else
           37         float z;
           38         z = __ieee754_expf(x);
           39         if(_LIB_VERSION == _IEEE_) return z;
           40         if(finitef(x)) {
           41             if(x>o_threshold)
           42                 /* exp overflow */
           43                 return (float)__kernel_standard((double)x,(double)x,106);
           44             else if(x<u_threshold)
           45                 /* exp underflow */
           46                 return (float)__kernel_standard((double)x,(double)x,107);
           47         }
           48         return z;
           49 #endif
           50 }