var aTest=[];
for(var i=0;i<1000000;i++){
    aTest[i]=i;
}

function process(val){
    return val+1;
}

function useDuffDevice(aTest){
var len=aTest.length,j=len%8,k;
while(j){
    process(aTest[len-(j--)]);
}

j=Math.floor(len/8);
while(j--){
    k=j*8-1;
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
    process(aTest[k--]);
}
}

function useWhile(aTest){
    var len=aTest.length;
    while(len--){
        process(aTest[len]);
    }
}

function useFor(aTest){
    var len=aTest.length;
    for(var i=0;i<len;i++){
        process(aTest[i]);
    }
}

console.group("useDuffDevice");
var date=new Date();
useDuffDevice(aTest);
var count=(new Date())-date;
console.log(count);
console.groupEnd();


console.group("useWhile");
date=new Date();
useWhile(aTest);
count=(new Date())-date;
console.log(count);
console.groupEnd();

console.group("useFor");
date=new Date();
useFor(aTest);
count=(new Date())-date;
console.log(count);
console.groupEnd();