/* s_scalbnf.c -- float version of s_scalbn.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"

static const float
two25   =  3.355443200e+07,	/* 0x4c000000 */
twom25  =  2.9802322388e-08;	/* 0x33000000 */

float
scalblnf (float x, long int n)
{
	__int32_t ix;
        uint32_t hx;
        long int k;

	GET_FLOAT_WORD(ix,x);
	hx = ix&0x7fffffff;
        k = hx>>23;		                /* extract exponent */
        if (k==0) {				/* 0 or subnormal x */
            if (hx == 0) return x;              /* +-0 */
	    x *= two25;
	    GET_FLOAT_WORD(ix,x);
	    k = ((ix&0x7f800000)>>23) - 25;
            if (n< -50000)
                return __math_uflowf(ix<0); 	/*underflow*/
	    }
        if (k==0xff) return x+x;		/* NaN or Inf */
        k = k+n;
        if (n> 50000 || k >  0xfe)
            return __math_oflowf(ix < 0);       /* overflow  */
        if (k > 0) 				/* normal result */
	    {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;}
        if (k <= -25)
	    return __math_uflowf(ix < 0);	/*underflow*/
        k += 25;				/* subnormal result */
	SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23));
        return check_uflowf(x*twom25);
}

_MATH_ALIAS_f_fj(scalbln)
