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Posts Tagged int
What is an int?
Aug 8
Logical operators are necessary in every app, so it’s unfortunate that they are so slow in AS3. That’s why I was happy to see a potential alternative in a recent comment by Skyboy. Today’s article shows you how to do logic faster by avoiding logical operators (e.g. &&) and using their bitwise (e.g. &) operator counterparts instead.
Loops With int and uint
Jun 20
AS3 has two integer types: int and uint. In my experience, most AS3 programmers just use int everywhere and ignore uint. This is usually acceptable as the need for unsigned integers is rare compared to their signed counterparts. However, there are significant performance differences between the two. Read on for the impact of uint on your loops. The original version of this article’s performance test contained a small-but-critical error that led to a lot of incorrect analysis and results. This version of the article has been corrected.
Explicit Type Conversion
Apr 25
Five months ago I said I’d talked about explicit type conversion. I hadn’t, really. What I talked about before was type casts. A cast changes the type, not the data. Today, I’m actually going to talk about type conversion and show you the costs of converting between all of your favorite types: int, uint, Number, Boolean, String, and even XML.
Implicit Type Conversion
Nov 15
I’ve talked before about explicit type conversion and used the function-call style (Type(obj)) and the as keyword to accomplish the task. Today, I’m going to talk about implicit type conversion and use—as implicit would imply—no operators at all!
String Conversion
Apr 30
It struck me recently that there are a lot of ways to convert variables of many types to a the String type. The ease of doing this is one of AS3′s strengths over languages where it’s error-prone, possibly insecure, and just plain difficult. The C language is the most obvious example of this and, since then, seemingly every language has enshrined string conversion in ways ranging from global String() functions (AS3) that take any variable to adding toString() to the base Object type (Java, AS3, others). AS3 seems to have chosen “all of the above” and there are now many ways to convert to a string. Below I’ll look at them from a performance standpoint and see if the everyday, run-of-the-mill boring string conversion can be improved by choosing one option over another.
The Size of Empty
Apr 20
I was reminded about the flash.sampler API by Grant Skinner’s recent post about it. While only available in the debug player, it can still tell us some valuable information about what goes on in the release player. Today I’m using the getSize function to find out how much memory overhead various classes impose, even when they are empty.
I’ve been looking at a lot of AVM2 bytecode recently with the excellent Nemo440 AIR app. Some of the code was using my inline Math.ceil() function and I noticed that the int() cast is implemented like any other function call. Today’s article will show you how to optimize the inline Math.ceil() call even further by avoiding this function call.
