bug#16842: [PATCH] Use mbrtowc_cache in DFA engine

[Norihiro Tanaka]

Package: grep
Tags: patch

The patch is DFA version of patch#16544 "Optimazation for is_mb_middle".
It will improve performance for non-UTF8 locales in DFA engine.

I tested below.  In both case, Speed-up 3-3.5x.

$ yes $(printf '%078dm' 0)|head -1000000 > in
$ for i in `seq 5`; do env LC_ALL=ja_JP.eucJP time src/grep n in; done

$ yes jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj | head -1000000 > k
$ for i in `seq 5`; do env LC_ALL=ja_JP.eucJP time src/grep -i foobar k; done

Norihiro

use_mb_cache_in_dfa.txt
Description: Binary data

tests.txt
Description: Binary data