Re: [Sablevm-user] SableVM question

[Etienne M. G. <eg...@j-...>]

Marcel Ammerlaan wrote:
> Ok. I've retested it and the results are much better now for the goto case
> (around 3 times faster) with a real-life example (e.g. newtest1 && newtest2).

Ah!  This is much more in line with the material that can be found on
"threaded interpretation" the literature.  

> I will get my own VM up & running again and use that as a testbed instead
> of simple programs so the compiler won't fool me again:)
> 
> I hate assembly and usually avoid it but in a case like this I should have
> checked what GCC did to the code...
> 
> > I might still be wrong, so please continue testing and keep us updated
> > on your findings.
> 
> I will (for now I'm focussing on the pre-interpretation bit as I've got
> better results when skipping this part and using a lookup table. I will
> investigate:)

Do not forget that the pre-interpretation phase is a linear phase. 
While running a real interpreter, you usually have many loops and
recursion that will make the pre-interpretation phase overhead pretty
insignificant.  This phase does nothing as complex as a non-naive JIT
would do.

Etienne
-- 
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Etienne M. Gagnon, M.Sc.                     e-mail: eg...@j-...
Author of SableVM:                             http://www.sablevm.org/
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