source: trunk/libs/newlib/src/newlib/libm/math/ef_scalb.c @ 471

/* ef_scalb.c -- float version of e_scalb.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#include "fdlibm.h"
#include <limits.h>

#ifdef _SCALB_INT
#ifdef __STDC__
        float __ieee754_scalbf(float x, int fn)
#else
        float __ieee754_scalbf(x,fn)
        float x; int fn;
#endif
#else
#ifdef __STDC__
        float __ieee754_scalbf(float x, float fn)
#else
        float __ieee754_scalbf(x,fn)
        float x, fn;
#endif
#endif
{
#ifdef _SCALB_INT
        return scalbnf(x,fn);
#else
        if (isnan(x)||isnan(fn)) return x*fn;
        if (!finitef(fn)) {
            if(fn>(float)0.0) return x*fn;
            else       return x/(-fn);
        }
        if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
#if INT_MAX > 65000
        if ( fn > (float)65000.0) return scalbnf(x, 65000);
        if (-fn > (float)65000.0) return scalbnf(x,-65000);
#else
        if ( fn > (float)32000.0) return scalbnf(x, 32000);
        if (-fn > (float)32000.0) return scalbnf(x,-32000);
#endif
        return scalbnf(x,(int)fn);
#endif
}