JSpeed

UPDATE

I'm currently pursuing a few Android projects, so this one is on hold. Feel free to email me with questions. Thanks for looking!

You can read how to implement it by heading over to the wiki;

JSpeed Implementation

News

• There are defects to be ironed out with this project, and those will begin to diminish as I get more time to work on this. If you encounter problems, please post issues, thanks!
• I uploaded a new version (0.2.0), which has the index as an interface for JSpeed. This way, you can avoid having to setup the PHP object all together.
• I haven't worked on this project lately, due to time constraints and other interests, but I plan to redirect my focus towards it.
• Thanks for your emails! I will look into applying some of the optimizations in a later release.

The JSpeed engine analyzes different portions of your JS code for fragments which can be optimized, and substitutes them with faster code.

Optimization Example:

    for (i=0;i<1;i++) {
	j = i + 1;
	f = Math.floor(i);
	f = Math.floor(21.4);
}

for (i = 0, j = 0; i < 1000000; i++, j++) {
	if (i == 4) {
		var tmp = i / 2;
		a = Math.abs(i);
	}
	
	if ((i % 2) == 0) {
		var tmp = i / 2;
		tmp = Math.min(i,tmp);
		i++;
	}
}
var arr = new Array(1000000);
for (var i = 0; i < arr.length; i++) {}

before: ~14 ms

  for (var i=0;i<1;++i) {
	j = i + 1;
	f = i>>0;
	f = 21.4>>0;
}

for (var i = 0, j = 0; i < 1000000; ++i, ++j) {
	if (i == 4) {
		var tmp = i >> 1;
		a = i < 0 ? ~i++ : i;
	}
	
	if ((i & 1) == 0) {
		var tmp = i >> 1;
		tmp = i < tmp ? i : tmp;
		i++;
	}
}
var arr = new Array(1000000);
for (var i = 0, arr_len = arr.length; i < arr_len; ++i) {}

after: ~7 ms

Features

• Helps make your code faster!
• Specify which part of your code (e.g. for-loops, function, global, etc.) you want JSpeed to target, and select which optimizations you want performed on it.
• Optimizations can be made via a regular expression, or through a callback function, in PHP.
• Minifies JavaScript code after it has been optimized
• Can take an array of scripts, and return each one separately, or concatenate them all into one (1) file.

Current Optimizations

• Division by 2,4,8
• Multiplication by 2,4,8
• Math.min optimization
• Math.floor optimization
• Math.abs optimization
• Even/odd check, i % 2 == 0
• Change for-loop conditional variables to local
• Post-increment to pre-increment
• Store array length in a variable in for-loops
• Code minification
• Join multiple scripts into one (1) optified (optimized/minifed) script.

Contact

If you have any inquiries or even have some optimization ideas to contribute, please send me an e-mail.

Thanks for looking!