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      1 /* e_scalbf.c -- float version of e_scalb.c.
      2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 #include <sys/cdefs.h>
     17 #if defined(LIBM_SCCS) && !defined(lint)
     18 __RCSID("$NetBSD: e_scalbf.c,v 1.7 2010/04/23 19:17:07 drochner Exp $");
     19 #endif
     20 
     21 #include "namespace.h"
     22 #include "math.h"
     23 #include "math_private.h"
     24 
     25 #ifdef _SCALB_INT
     26 float
     27 __ieee754_scalbf(float x, int fn)
     28 #else
     29 float
     30 __ieee754_scalbf(float x, float fn)
     31 #endif
     32 {
     33 #ifdef _SCALB_INT
     34 	return scalbnf(x,fn);
     35 #else
     36 	if (isnanf(x)||isnanf(fn)) return x*fn;
     37 	if (!finitef(fn)) {
     38 	    if(fn>(float)0.0) return x*fn;
     39 	    else       return x/(-fn);
     40 	}
     41 	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
     42 	if ( fn > (float)65000.0) return scalbnf(x, 65000);
     43 	if (-fn > (float)65000.0) return scalbnf(x,-65000);
     44 	return scalbnf(x,(int)fn);
     45 #endif
     46 }
     47