Greenberg's Duff's Device array processing speedup

duffs_device

let iterations = Math.floor(values.length / 8);
let leftover = values.length % 8;
let i = 0;

if (leftover > 0) {
    do {
        process(values[i++]);
    } while (--leftover > 0);
}

if (data.length < 8) {
    return;
}

do {
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
    process(values[i++]);
} while (--iterations > 0);