May 08, 2002

New Regex Compiler Backend

It looks like the new back-end to my common-lisp regular expression engine is about finished. This one returns lisp s-exprs instead of closures, so it's suitable for use in macros like deflexer. It still needs a bit more brushing up before I'm ready to make it available, but it looks good so far. At the moment it doesn't seem to match any faster than the closure-based code. Using Lispworks 4.2, turning on inlining seems to improve the speed by 30% or so, but increases compile times exponentially and unacceptably. The old sexpr-generating regex compiler had the same unpleasant exploding-compile-time behavior with the Symbolics compiler, although there it gave an order-of-magnitude improvement in matching speed. At any rate, given the specialized nature of the code involved, I'm pretty sure I can hand-roll a customized inliner that that is linear-time.

Posted by: mparker762 at 03:48 AM
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