[LLVMdev] new set of superoptimizer results

[Michael Zolotukhin]

John,

That’s a great post and really interesting data, thank you!

> On Nov 25, 2014, at 9:58 AM, Reid Kleckner <rnk at google.com> wrote:
> 
> Cool! Looks like we do lots of provably unnecessary alignment checks. :)
Indeed, but where do these checks come from? As far as I know, right now vectorizer doesn’t generate them, and who else could do that?

Michael

> 
> On Tue, Nov 25, 2014 at 9:03 AM, John Regehr <regehr at cs.utah.edu <mailto:regehr at cs.utah.edu>> wrote:
> Actually, let me save you some time by pointing out the thing that is perhaps immediately useful about our recent work, which is the fact that Souper now supports "optimization profiling".
> 
> If you build an LLVM using Souper and then use that LLVM to build SPEC CPU 2006, here are optimizations ranked by dynamic profile count:
> 
>   http://blog.regehr.org/extra_files/souper-nov-14/bydprofile.html <http://blog.regehr.org/extra_files/souper-nov-14/bydprofile.html>
> 
> In other words, if you implement optimizations near the top of this list, you would be likely to make LLVM compile SPEC CPU 2006 in less time.
> 
> Here are the optimizations sorted by static profile count:
> 
>   http://blog.regehr.org/extra_files/souper-nov-14/bysprofile.html <http://blog.regehr.org/extra_files/souper-nov-14/bysprofile.html>
> 
> Implementing the highly ranked ones would be likely to make the clang binary smaller.
> 
> Finally here are the optimizations sorted by size; this is handy because the higher-ranked ones are generally easier to understand:
> 
>   http://blog.regehr.org/extra_files/souper-nov-14/bysize.html <http://blog.regehr.org/extra_files/souper-nov-14/bysize.html>
> 
> 
> John
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu>         http://llvm.cs.uiuc.edu <http://llvm.cs.uiuc.edu/>
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev <http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20141126/a1732b84/attachment.html>