On Mar 25, 2011, at 5:26 PM, Mariano Martinez Peck wrote:
> Hi. I have to say that I hate that the compiler associates a special bytecode
> for #class and that the VM don't even send the message. I want to be able to
> overwrite #class in a proxy for example, or to debug it.
>
> I did some benchmarks disabling such optimization by doing:
>
> (ParseNode classVarNamed: 'StdSelectors') removeKey: #class ifAbsent: [].
> Compiler recompileAll.
>
> And the difference is NOTHING in my tests (maybe I am doing something wrong).
>
> With Standard VM and #class optimization
>
> [SystemNavigation default allObjectsDo: [:each | each class]] timeToRun ->
> aprox 50 miliseconds
>
What is the constant over head of doing just the iteration?
[SystemNavigation default allObjectsDo: [:each | ]] timeToRun
>
> What do you think?
I am for... for the JIT is is a monomorphic send to a primitive, so the IC will
be very effective
and should take care that the lookup is actually almost never done. (and the
lookup is the
only thing the #class bytecode saves, as the target method is a primitive).
Marcus
--
Marcus Denker -- http://www.marcusdenker.de
INRIA Lille -- Nord Europe. Team RMoD.
