/*--------------------------------------------------------------------

 *© Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *--------------------------------------------------------------------

*/

/* e_hypotf.c -- float version of e_hypot.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.

 * ====================================================

 */

#ifndef __SYMBIAN32__

#ifndef lint

static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_hypotf.c,v 1.9 2002/05/28 18:15:03 alfred Exp $";

#endif

#endif //__SYMBIAN32__

#include <math.h>

#include "math_private.h"

EXPORT_C float

__ieee754_hypotf(float x, float y)

{

	float a=x,b=y,t1,t2,y1,y2,w;

	int32_t j,k,ha,hb;

	GET_FLOAT_WORD(ha,x);

	ha &= 0x7fffffff;

	GET_FLOAT_WORD(hb,y);

	hb &= 0x7fffffff;

	if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}

	SET_FLOAT_WORD(a,ha);	/* a <- |a| */

	SET_FLOAT_WORD(b,hb);	/* b <- |b| */

	if((ha-hb)>0xf000000) {return a+b;} /* x/y > 2**30 */

	k=0;

	if(ha > 0x58800000) {	/* a>2**50 */

	   if(ha >= 0x7f800000) {	/* Inf or NaN */

	       w = a+b;			/* for sNaN */

	       if(ha == 0x7f800000) w = a;

	       if(hb == 0x7f800000) w = b;

	       return w;

	   }

	   /* scale a and b by 2**-68 */

	   ha -= 0x22000000; hb -= 0x22000000;	k += 68;

	   SET_FLOAT_WORD(a,ha);

	   SET_FLOAT_WORD(b,hb);

	}

	if(hb < 0x26800000) {	/* b < 2**-50 */

	    if(hb <= 0x007fffff) {	/* subnormal b or 0 */

	        if(hb==0) return a;

		SET_FLOAT_WORD(t1,0x7e800000);	/* t1=2^126 */

		b *= t1;

		a *= t1;

		k -= 126;

	    } else {		/* scale a and b by 2^68 */

	        ha += 0x22000000; 	/* a *= 2^68 */

		hb += 0x22000000;	/* b *= 2^68 */

		k -= 68;

		SET_FLOAT_WORD(a,ha);

		SET_FLOAT_WORD(b,hb);

	    }

	}

    /* medium size a and b */

	w = a-b;

	if (w>b) {

	    SET_FLOAT_WORD(t1,ha&0xfffff000);

	    t2 = a-t1;

	    w  = __ieee754_sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));

	} else {

	    a  = a+a;

	    SET_FLOAT_WORD(y1,hb&0xfffff000);

	    y2 = b - y1;

	    SET_FLOAT_WORD(t1,ha+0x00800000);

	    t2 = a - t1;

	    w  = __ieee754_sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));

	}

	if(k!=0) {

	    SET_FLOAT_WORD(t1,0x3f800000+(k<<23));

	    return t1*w;

	} else return w;

}