In perl.git, the branch smoke-me/yves_optimise_nothing has been created
<http://perl5.git.perl.org/perl.git/commitdiff/494399e02fed50bd6d3ef3a053d45ae95737c779?hp=0000000000000000000000000000000000000000>
at 494399e02fed50bd6d3ef3a053d45ae95737c779 (commit)
- Log -----------------------------------------------------------------
commit 494399e02fed50bd6d3ef3a053d45ae95737c779
Author: Yves Orton <[email protected]>
Date: Wed Jun 6 08:53:05 2012 +0200
optimise (?:|) and related NOTHING like constructs out of the compiled
optree
A pattern like (?:|) causes the regex engine to do extra work even though
it is equivelent to matching nothing. This optimises such sequences into
more efficient opcodes that do less work, and in some cases optimises
them away entirely.
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