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From: | Paul Eggert |
Subject: | bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales |
Date: | Wed, 19 Feb 2014 10:30:24 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 |
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.
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