There is a nice article about the JIT that Facebook uses in his HipHop VM. https://www.facebook.com/notes/facebook-engineering/speeding-up-php-based-development-with-hiphop-vm/10151170460698920
They have an inline cache with several guards and they found that it was better from the perf point of view to link the guard by putting the older first instead of putting the newer first. I wonder if there is the same effect for other languages, I will test with Java + a dedicated indy logic with week end.
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