[ENH] Faster CopyLoop
John M McIntosh
johnmci at smalltalkconsulting.com
Mon Jun 30 06:31:40 UTC 2003
A few years back (Dec 1999) I was fiddling (with Andreas) in
copyLoopPixMap. Now it seems that last
week Apple introduced some new versions of some hardware performance
diagnostics tools which
I decided to point at the Squeak VM and look to see what is up.
One of the hot-spots when running the FreeCell macro benchmarks is
copyLoop where the tools
told me I had lots of processor stalls which pointed to issues
reading/writting to instance variables
in BitBltSimulation>>copyLoop
So some careful reading and changes to some of the code to cache
instance variables into locals
I find I've a VM that runs the FreeCell macro benchmark about 5% faster.
I'll point out that some instance variables can't become locals like
'destMask' because that's used in
a combinationRule subfunction for alpha blending (alphaBlendConst:
with: )
Some folks might want to check to see if I've not broken anything...
Tho copyLoopPixMap still needs some
serious consideration...
--
========================================================================
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John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com
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