vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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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 }