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[Bug libc/12100] QoI regression: strstr() slowed from O(n) to O(n^2) on SSE4 machines
- From: "neleai at seznam dot cz" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Thu, 28 Jun 2012 23:54:40 +0000
- Subject: [Bug libc/12100] QoI regression: strstr() slowed from O(n) to O(n^2) on SSE4 machines
- Auto-submitted: auto-generated
- References: <bug-12100-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=12100
--- Comment #6 from Ondrej Bilka <neleai at seznam dot cz> 2012-06-28 23:54:40 UTC ---
I will submit a patch after freeze ends. I made several performance
improvements from what I suggested.
On Thu, Jun 28, 2012 at 10:41:29PM +0000, eblake at redhat dot com wrote:
> http://sourceware.org/bugzilla/show_bug.cgi?id=12100
>
> --- Comment #5 from Eric Blake <eblake at redhat dot com> 2012-06-28 22:41:29 UTC ---
> (In reply to comment #3)
> > We want this fixed in 2.17.
> >
> > We expect that Maxim[1] or Ondrej's[2] patches will fix this.
> >
> > [1] http://sourceware.org/ml/libc-alpha/2012-05/msg01228.html
> >
> > [2] http://sourceware.org/ml/libc-alpha/2012-06/msg00027.html
>
> Note that [2] was just a summary of Ondrej's benchmarking; searching for an
> actual patch of his turns up this link:
>
> http://sourceware.org/ml/libc-help/2011-11/msg00011.html
>
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