Source for peephole optimizers, anyone?

[C. Kevin Mcintyre]

I am looking for some source/suggestions/clues/etc... (whatever) for 
Peephole Optimizers.  I have looked at the Aho Dragon book but it is
somewhat lacking in this area.  As far as I can tell it is just a matter
of "string" matching and replacement.  I am especially interested in how
the "big" compiler writing companies do their peephole optimizing if
any of them read this newsgroup.  Any help will be greatly appreciated
and I will post the results/suggestions back to the net if the 
interest is great enough.  


				--Thanks, Kevin.


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