var dx:Number = 3.53434534;
var dy:Number = 3.2;
var dz:Number = 10;

var a:Array = new Array();

for(var apprx:uint = 0; apprx< 1024;apprx++)
{
	a[apprx] = 1/Math.sqrt(apprx);
}

var dzz:Number = dx*dx + dy*dy + dz*dz;
var invsqrt:Number;
var rsqrt:Number;

var s:uint = getTimer();

for(var j:uint = 0;j<1000000;j++)
{
	rsqrt = 1 / Math.sqrt(dzz);
}

var s2:uint = getTimer();

for(var i:uint = 0;i<1000000;i++)
{
	var aval:Number = a[int(dzz)];
	invsqrt = 1.5*aval - 0.5*dzz*aval*aval*aval;
	invsqrt = 1.5*invsqrt - 0.5*dzz*invsqrt*invsqrt*invsqrt;
	invsqrt = 1.5*invsqrt - 0.5*dzz*invsqrt*invsqrt*invsqrt;
}


var s3:uint = getTimer();

trace(" "+(s2-s)+" "+(s3-s2));