Variable Optimization by the Flash Compiler 2004-03-01 - By Jesse Warden
Back
I think Darron is recovering from jet lag or Andreas is just taking awhile
to write his answer.
*ahem*
>From what I know from reading Flashcoders a long time ago is that small
varible names lead to small string names. Since, bytecode wise, they are
just one big hash table using strings as keys (I think). Therefore, it's a
longer to search for variables that have longer names. That is the key to
the speed decrease.
This is exponential using dot syntax with movie clip paths.
Like:
_root.cow.moo.foo.bar
If you look in the decompiled bytecode via Flasm, the amount of bytecode
used for dot syntax vs. slash "/cow/moo/foo/bar" is a few lines smaller.
Couple that by how many thousands of places in your code, and this adds up
in filesize and speed.
Specially in:
this.mc._x += 8;
vs.
setVariable("/mc", "x", getVariable("/mc", "x") + 8);
That alone is enough to make or break a lot of games people make in Flash.
Regardless of what the documentation says, setVariable/getVariable as well
as tellTarget are NOT depreciated. Course, after doing that, you still
gotta go in the bytecode and make more optimizations, but I'm not that much
of a geek.
-- --Original Message-- --
From: Justin Palmer [mailto:justin@(protected)]
Sent: Monday, March 01, 2004 05:04 PM
To: flashnewbie@(protected)
Subject: [Flashnewbie] Variable Optimization by the Flash Compiler
Hi,
I have heard many times to watch your variables lengths in your movies to
help execute code faster and to make smaller movies. Is this true? If so,
why?
I look at the Java Virtual Machine, and say why would it be so hard for the
flash compiler to do the same. The JVM takes all of the variable names and
reduces them to a minimal name for you. This great so that Programmers can
program with variable names that make sense for the situation with out
worrying about what the compiler does with them and how it could effect your
movie. There in increasing maintainability and readability for all
programmers on any given project. Any insight would be great.
Regards,
Justin Palmer
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