RE: [Flashcoders] Even odds

[Scott Hyndman]

Seems my last email got swallowed by the void. Here it is:

Nice tests!

You're totally right. I had no idea that Macromedia did any optimization
during compilation. Very cool. It's also pretty interesting that Java
did not seem to optimize the very same code (the numbers seem to suggest
it).

haha, thanks for the plug.

Scott 

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark
Winterhalder
Sent: December 9, 2005 12:09 AM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Even odds

OK, I ran some tests of my own. After repeating it a couple of times,
with various outcomes, the trend seems to be that a) the cast is about
10% faster than the equality, and b) the bitwise and is about 10% faster
than the modulo.
I used MTASC to compile, FP8 under wine on Linux, and the ActionStep
Debug Panel (ActionStep alpha 1 has been released! check it out:
actionstep.org).
I decided to go with triggering it onKeyDown, to avoid initialization of
the player and to be easily able to run repeated tests.

Here's the code:

var bench:Object = {};
bench.onKeyDown = function () {
        var repeats:Number = 500000;
        var i:Number = repeats;
        var foo;
        var start:Number = getTimer();
        while( i-- ) {
                foo = ( Math.random() * 100000 )|0;
        }
        var overhead:Number = getTimer() - start;
        trace( "overhead: " + overhead );
        i = repeats;
        start = getTimer();
        while( i-- ) {
                foo = ( Math.random() * 100000 )|0 % 2 == 1;
        }
        trace( "modulo, equality: " + ( getTimer() - start - overhead )
);
        i = repeats;
        start = getTimer();
        while( i-- ) {
                foo = Boolean( ( Math.random() * 100000 )|0 % 2 );
        }
        trace( "modulo, cast: " + ( getTimer() - start - overhead ) );
        i = repeats;
        start = getTimer();
        while( i-- ) {
                foo = ( Math.random() * 100000 )|0 & 1 == 1;
        }
        trace( "and, equality: " + ( getTimer() - start - overhead ) );
        i = repeats;
        start = getTimer();
        while( i-- ) {
                foo = Boolean( ( Math.random() * 100000 )|0 & 1 );
        }
        trace( "and, cast: " + ( getTimer() - start - overhead ) ); }
Key.addListener( bench );

//mark

--
http://snafoo.org/
jabber: [EMAIL PROTECTED]
_______________________________________________
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
_______________________________________________
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders