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
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).