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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 35037] - [PATCH] Some Field methods use Classcast check instead of instanceof which is slow
Date Thu, 26 May 2005 17:09:37 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=35037





------- Additional Comments From whoschek@lbl.gov  2005-05-26 19:09 -------
Daniel: If there's a lot other stuff going on that introduces measurement variance and perturbation,
it 
makes sense to isolate the cast issue into a small microbenchmark. I think the code I sent
demonstrates 
beyond doubt that the "instanceOf + cast" version is always faster no matter which branch
is taken. It 
doesn't matter which branch is more common, it's always faster. The "catch ClassCastException"
is an 
idiom that may have worked well in JDK <= 1.2 but it is demonstrably counterproductive
on more recent 
VMs.



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