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Re: bug#40634: Massive pattern list handling with -E format seems very s
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From: |
Norihiro Tanaka |
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Subject: |
Re: bug#40634: Massive pattern list handling with -E format seems very slow since 2.28. |
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Date: |
Sat, 18 Apr 2020 00:22:26 +0900 |
On Fri, 17 Apr 2020 10:24:42 +0900
Norihiro Tanaka <address@hidden> wrote:
>
> On Fri, 17 Apr 2020 09:35:36 +0900
> Norihiro Tanaka <address@hidden> wrote:
>
> >
> > On Thu, 16 Apr 2020 16:00:29 -0700
> > Paul Eggert <address@hidden> wrote:
> >
> > > On 4/16/20 3:53 PM, Norihiro Tanaka wrote:
> > >
> > > > I have had no idea to solve the problem yet. If we revert it, bug#33357
> > > > will come back.
> > >
> > > Yes, I'd rather not revert if we can help it.
> > >
> > > My own thought was to not analyze the regular expression if we discover
> > > that the input is empty. :-)
> >
> > Now, I have a idea, it is that we build indexes of epsilon nodes
> > including in follows before remove epsilon nodes.
>
>
> I wrote fix for the bug, but it will be slower then at grep 2.27 yet.
It was improved previous patch.
0001-dfa-build-auxiliary-indexes-before-remove-epsilon-cl_old.patch
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