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Re: [PATCH] dfa: addition of new state on demand


From: Norihiro Tanaka
Subject: Re: [PATCH] dfa: addition of new state on demand
Date: Mon, 17 Oct 2016 22:00:33 +0900

On Mon, 17 Oct 2016 11:45:43 +0900
Norihiro Tanaka <address@hidden> wrote:

> When dfa builds a state, generates all next states.  However, I believe
> most of them are not used.
> 
> This patch changes as that when dfa builds a state, generates a next
> state including next input character only.
> 
> The following test was improved from 2.52s to 0.67s by the patch in my
> machine.
> 
> $ seq -f '%g bottles of beer on the wall' 600 >600
> $ time -p env LC_ALL=C src/grep -vf 600 600
> 
> $ env LC_ALL=C gcc -v
> Reading specs from /usr/local/lib/gcc/x86_64-pc-linux-gnu/4.4.7/specs
> Target: x86_64-pc-linux-gnu
> Configured with: ./configure --with-as=/usr/local/bin/as 
> --with-ld=/usr/local/bin/ld --with-system-zlib --enable-__cxa_atexit
> Thread model: posix
> gcc version 4.4.7 (GCC)
> $ uname -a
> Linux rhel6 2.6.32-642.el6.x86_64 #1 SMP Wed Apr 13 00:51:26 EDT 2016 x86_64 
> x86_64 x86_64 GNU/Linux

Hi,

I updated comments in previous patch.

Thanks,
Norihiro

Attachment: 0001-dfa-addition-of-new-state-on-demand.patch
Description: Text document


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