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apply sparse set trick for nlist exclusion

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Kyryl Melekhin
2021-12-11 15:30:56 +00:00
parent 14fd849706
commit b2180201d5
2 changed files with 68 additions and 91 deletions
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@@ -164,16 +164,16 @@ near the overflow, but as you may guess that does not come
for free.
Currently I removed all dynamic global state from the instructions
fixing any overlow issue at the cost of slight overhead of needing
to look though the nlist states, to prevent their readdition. This
solution is still fast because it affects only nlist + split run on
so most other uses of regex don't suffer big performace penalty.
This does not solve the ambiguity problem with multiple
continuous states though. Finding a fast O(1) solution for continuous
ambiguity is the last thing preventing me to call this regex engine
PERFECT and limitation free. While yet, this is to be invented it
takes a big deal of genius and creativity to make new algorithms
or find improvements in what we already know.
fixing any overlow issue utilizing a sparse set datastructure trick
which abuses the uninitialized varibles. This allows the redundant
states to be excluded in O(1) operation. That said, don't run
valgrind on pikevm as it will go crazy, or find a way to surpress
errors from pikevm.
Further reading
===============
https://research.swtch.com/sparse
https://swtch.com/~rsc/regexp/regexp1.html
Author and License
==================