JavaScript property value rotation microbenchmark

proprot.js

// node.js is about 4-5x faster than JS->C compiler and 470x faster than duktape
var obj1,obj2;
obj1={x:12,y:34};
obj2={x:56,y:78};

var start,stop;
console.log("Warmup");
rot(obj1,obj2);
console.log("Bench");
start=new Date().valueOf();
rot(obj1,obj2);
stop=new Date().valueOf();
console.log(obj1.x+" "+obj1.y+" "+obj2.x+" "+obj2.y);
console.log(stop-start);

function rot(a,b) {
	var c;
	var tmp;
	
	console.log("In rot?!");
	c=1;
	while(c<10000000) {
		tmp=a.x;
		a.x=a.y;
		a.y=b.x;
		b.x=b.y;
		b.y=tmp;
		c=c+1;
	}
}