s_logbf.c - vx32 - Local 9vx git repository for patches.
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       ---
       s_logbf.c (932B)
       ---
            1 /* s_logbf.c -- float version of s_logb.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/s_logbf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           18 #endif
           19 
           20 #include "math.h"
           21 #include "math_private.h"
           22 
           23 float
           24 logbf(float x)
           25 {
           26         int32_t ix;
           27         GET_FLOAT_WORD(ix,x);
           28         ix &= 0x7fffffff;                        /* high |x| */
           29         if(ix==0) return (float)-1.0/fabsf(x);
           30         if(ix>=0x7f800000) return x*x;
           31         if((ix>>=23)==0)                         /* IEEE 754 logb */
           32                 return -126.0;
           33         else
           34                 return (float) (ix-127);
           35 }