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Created July 30, 2016 08:47
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index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>duff's device</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
<script src="./suite.js"></script>
</head>
<body>
<h1>Open the console to view the results</h1>
<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
</body>
</html>
Raw
suite.js
"use strict";
(function (factory) {
if (typeof Benchmark !== "undefined") {
factory(Benchmark);
} else {
factory(require("benchmark"));
}
})(function (Benchmark) {
var suite = new Benchmark.Suite;
Benchmark.prototype.setup = function () {
const arr10 = new Array(10000);
function process(item) {
return item;
}
};
suite.add("for (var i=0; i<arr10.length; i++) {", function () {
for (var i=0; i<arr10.length; i++) {
process(arr10[i]);
}
});
suite.add("var iterations = (arr10.length + 7) >> 3;", function () {
var iterations = (arr10.length + 7) >> 3;
var startAt = arr10.length & 0x7;
var i = 0;
do {
switch (startAt) {
case 0: process(arr10[i++]);
case 7: process(arr10[i++]);
case 6: process(arr10[i++]);
case 5: process(arr10[i++]);
case 4: process(arr10[i++]);
case 3: process(arr10[i++]);
case 2: process(arr10[i++]);
case 1: process(arr10[i++]);
}
startAt = 0;
} while (--iterations > 0);
});
suite.add("var iterations = arr10.length >> 3;", function () {
var iterations = arr10.length >> 3;
var startAt = arr10.length % 8;
var i = 0;
do {
switch (startAt) {
case 0: process(arr10[i++]);
case 7: process(arr10[i++]);
case 6: process(arr10[i++]);
case 5: process(arr10[i++]);
case 4: process(arr10[i++]);
case 3: process(arr10[i++]);
case 2: process(arr10[i++]);
case 1: process(arr10[i++]);
}
startAt = 0;
} while (iterations-- > 0);
});
suite.on("cycle", function (evt) {
console.log(" - " + evt.target);
});
suite.on("complete", function (evt) {
console.log(new Array(30).join("-"));
var results = evt.currentTarget.sort(function (a, b) {
return b.hz - a.hz;
});
results.forEach(function (item) {
console.log((idx + 1) + ". " + item);
});
});
console.log("duff's device");
console.log(new Array(30).join("-"));
suite.run();
});
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