[PATCH] D26241: [ELF] Speed-up lld up to 5 times by replacing llvm:regex with simple string matcher.

[Joerg Sonnenberger via llvm-commits]

joerg added a comment.

Wouldn't it be better in general to handle fixed string prefixes directly in the matcher and only fallback to a more generic matcher if the prefix check passes? Independent of glob or regex, there are three basic situations:

- fixed string match --> done after the prefix match
- fixed prefix, wildcard rest --> done after the prefix match
- rest

I wonder how much of the performance benefit is obtained by just doing this peephole optimisation.


Repository:
  rL LLVM

https://reviews.llvm.org/D26241