GNU bug report logs - #16232
[PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales

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Package: grep;

Reported by: Jim Meyering <jim <at> meyering.net>

Date: Mon, 23 Dec 2013 22:40:02 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: Paul Eggert <eggert <at> cs.ucla.edu>
To: Norihiro Tanaka <noritnk <at> kcn.ne.jp>, Padraig Brady <P <at> draigBrady.com>
Cc: 16232 <16232 <at> debbugs.gnu.org>
Subject: bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales
Date: Wed, 19 Feb 2014 10:30:24 -0800

On 02/19/2014 06:22 AM, Norihiro Tanaka wrote:
> I tested performance on grep-2.17 and the version which the patch is reverted.
> Latter is 100x faster.

While we're on the topic, can someone please say why that patch was done 
as a preprocessor for the regex code?  I normally would think that the 
way to speed up regex processing is to improve dfa.c and/or the regex 
library, as that should speed up all programs that use these modules, 
not just grep.
This bug report was last modified 11 years and 82 days ago.

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