GNU bug report logs - #18777
[PATCH] dfa: improvement for checking of multibyte character boundary

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Package: grep;

Reported by: Norihiro Tanaka <noritnk <at> kcn.ne.jp>

Date: Mon, 20 Oct 2014 15:05:01 UTC

Severity: normal

Tags: patch

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Norihiro Tanaka <noritnk <at> kcn.ne.jp>
To: 18777 <at> debbugs.gnu.org
Subject: bug#18777: [PATCH] dfa: improvement for checking of multibyte character boundary
Date: Tue, 21 Oct 2014 00:04:02 +0900

[Message part 1 (text/plain, inline)]
This patch improves performance for input string which doesn't match
even the first part of a pattern.  Although there is no less effective
for grep as it uses a superset of DFA, gawk speeds up about 40%.

$ time -p env LC_ALL=ja_JP.eucJP ./gawk '/k/ { print }' ../k

(before)
  real 2.85  user 2.79  sys 0.05

(after)
  real 1.70  user 1.64  sys 0.06

I think that this improvement should have been performed in bug#17576.

[0001-dfa-improvement-for-checking-of-multibyte-character-.patch (text/plain, attachment)]
This bug report was last modified 9 years and 74 days ago.

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