regression on Adobe-C++/loop_unroll

[Chandler Carruth]

It's really weird because the public performance bots don't show this
regression:

http://llvm.org/perf/db_default/v4/nts/21277

It would be really nice to get the stuff that people have hard requirements
on posted to the LNT dashboard...

It's also particularly weird because this shouldn't really have changed the
way LICM works. Looking into it though...

On Thu Feb 06 2014 at 11:19:21 AM, Gerolf Hoflehner <ghoflehner at apple.com>
wrote:

> Hi Chandler
>
> your commit seems to cause a major regression (>20%)  on loop_unroll and
> other benchmarks as well. This is ( at least)  on x86 under -O3 -flto and
> seems to be due to the loss of LICM. Please take a look.
>
> Cheers
> Gerolf
>
> ------------------------------------------------------------------------
> r200067 | chandlerc | 2014-01-24 20:07:24 -0800 (Fri, 24 Jan 2014) | 44
> lines
>
> [LPM] Make LCSSA a utility with a FunctionPass that applies it to all
> the loops in a function, and teach LICM to work in the presance of
> LCSSA.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20140207/6570cbaf/attachment.html>