From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-01-13T16:32:46+09:00
Subject: Re: 1.9 significantly slower than 1.8 on Mac

Marcin Miel��y��ski wrote:
> The bottleneck here is the anychar (OP_ANYCHAR in regexec.c) instruction 
> which uses 'enclen' and 'is_mbc_newline' (which are function pointers, 
> so impossible to be inlined).
> 
> Joni goes a bit further and uses a bunch of singlebyte specialized 
> opcodes when it detects singlebyte encoding being used.

FYI, for those not following it, Joni is the new regular expression 
engine for JRuby. It is a port of Oniguruma, the regexp engine for Ruby 1.9.

- Charlie