Depends. Local variables are faster in some casese because it uses optimized registers. Promotion is also something to watch out for regarding ints in loops.
If you're really interested, go ask the FLASM guys to update their tool for Flash Player 9, and you can inspect the bytecode to see how much is added by certain casting operations. For something more concerete, look here: http://www.flex.org/ACDS/AS3TuningInsideAVM2JIT.pdf http://www.flex.org/ACDS/GC.swf http://www.flex.org/ACDS/Interpreter.swf http://www.flex.org/ACDS/JITMovie.swf ----- Original Message ----- From: "bobpardoe1959" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, July 27, 2006 12:29 PM Subject: [flexcoders] Cast or create local var - which is best \ performant We are haveing a debate here at work regarding the the most performant \ efficient \ best way of dealing with the casting of objects from one form to another. a) One person thinks that casting the object to the correct type each time it is used is better because casting has a compile time penalty, but at runtime does not incurr a cost. b) The other person would have us believe that the creation of a variable of the correct type and casting the object to it and then using the local variable (thereby eliminating many casts)is better. I side with a) on the basis that the creation of the variable and the garbage collection of it costs more than the casting might. Bearing in mind that either of these methods might be performed in hundreds of places in the application. Is there a difference ? Will any one notice. Is one better ?. Are we being a little to retentive ? thanks BOb -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
