s_ilogbf.c - vx32 - Local 9vx git repository for patches.
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       ---
       s_ilogbf.c (1053B)
       ---
            1 /* s_ilogbf.c -- float version of s_ilogb.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_ilogbf.c,v 1.7 2004/10/09 17:14:28 stefanf Exp $";
           18 #endif
           19 
           20 #include <limits.h>
           21 
           22 #include "math.h"
           23 #include "math_private.h"
           24 
           25         int ilogbf(float x)
           26 {
           27         int32_t hx,ix;
           28 
           29         GET_FLOAT_WORD(hx,x);
           30         hx &= 0x7fffffff;
           31         if(hx<0x00800000) {
           32             if(hx==0)
           33                 return FP_ILOGB0;
           34             else                        /* subnormal x */
           35                 for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1;
           36             return ix;
           37         }
           38         else if (hx<0x7f800000) return (hx>>23)-127;
           39         else if (hx>0x7f800000) return FP_ILOGBNAN;
           40         else return INT_MAX;
           41 }