[pypy-dev] Bytecode counting patch

[Ben.Young at risk.sungard.com]

pypy-dev-bounces at codespeak.net wrote on 07/08/2006 17:35:17:

> Hi Ben,
> 
> It's nice to know what opcodes are popular! However, sorting them in 
> whatever order within a switch will likely not make a difference.
> This switch will be converted to a jumptable, so the compiler will 
> order the cases again.
> 
> cheers
> Eric
> 

Hi Eric,

It probably won't, but there appeared to be some desire for this on irc, 
and this is the kind of project I can fit into my lunch break! I think 
it's worth a try to see if it makes a difference. Unfortunately, I can't 
test it here.

Cheers,
Ben

> 
> On Aug 7, 2006, at 4:35 PM, Ben.Young at risk.sungard.com wrote:
> 
> > Hi PyPys!
> >
> > Here's a patch that counts the number of times the different 
> > bytecodes are
> > used. I haven't tried doing translation yet as I can't use the work
> > machine cycles, but it can't be far off. I've put the counts on the 
> > object
> > space as this is accessable from most places.
> >
> > I've also implemented something that should resort the opcodes in the
> > switch statement of the bytecode dispatcher according to the 
> > statistics I
> > found. This may have a slight speed improvement.
> >
> >
> >
> > Cheers,
> > Ben
> > <diff.txt>
> > _______________________________________________
> > pypy-dev at codespeak.net
> > http://codespeak.net/mailman/listinfo/pypy-dev
> 
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