[llvm-dev] Fwd: Superoptimization for RISC-V: What is the state of the art now?

[Wei Wu (吴伟) via llvm-dev]

Hi Paulo,

I am really excited to know that you are planning to open source S10!

On Wed, Feb 17, 2021 at 7:55 PM Paulo Matos <pmatos at igalia.com> wrote:

>
> Hi Wei,
>
> Back in 2018 I worked in a commercial superoptimizer for RISCV - S10,
> which I presented as a poster in the RISCV Workshop in Barcelona:
> https://youtu.be/ylTA63vPHYU?t=1969
> https://linki.tools/s10.html
>
> To be fair, this was mostly used for consultancy into specific hot code
> blocks. Since then I moved on to other things but still hold a keen
> interest in Superoptimization.
>
> S10 was built upon greenthumb:
> https://github.com/mangpo/greenthumb
>
> I have been meaning to open source S10 but writing the documentation,
> cleaning up the code, etc is taking quite a bit of time although it's
> one of my priorities for 2021.
>
> In any case, if you want to know more or if I can help any further, feel
> free to drop me an email.
>
> --
> Paulo Matos
>
> Wei Wu (吴伟) via llvm-dev writes:
>
> > Hi all,
> >
> > I appreciate it if you can drop some information/papers/open source
> project
> > urls that are related to superoptimization. Although I am targeting
> RISC-V
> > ISA, there might be some other research works / open source projects
> > available in the LLVM community.
> >
> > (Sorry for the duplicate email.)
> >
> > ---------- Forwarded message ---------
> > From: Wei Wu (吴伟) <lazyparser at gmail.com>
> > Date: Wed, Feb 17, 2021 at 12:26 PM
> > Subject: Superoptimization for RISC-V: What is the state of the art now?
> > To: RISC-V SW Dev <sw-dev at groups.riscv.org>
> >
> >
> > Hi all,
> >
> > In the last code optimization meeting (formly code-size-reduction and
> > code-speed-opt), the idea of using superoptimization[4] for RISC-V had
> been
> > discussed. I'm interested in this area. After a quick search I found very
> > few results, though. GNU/Embecosm had a superopt [1] but I am not sure it
> > still works either for GCC 10 or RISC-V backend. Google open sourced a
> > LLVM-IR level tool named souper[2] would help. STOKE[3] is yet another
> > optimizer which targets x86 only.
> >
> > I appreciate it if you can drop some information/papers/open source
> project
> > urls that are related to superoptimization. I am going to stand on the
> > basis of gnu-superopt[1], and not sure it is the right/effective way to
> go.
> >
> > Thanks.
> >
> > [1] https://github.com/embecosm/gnu-superopt
> > [2] https://github.com/google/souper
> > [3] https://github.com/StanfordPL/stoke
> > [4] https://en.wikipedia.org/wiki/Superoptimization
> >
> > --
> > Best wishes,
> > Wei Wu (吴伟)
>
>
> --
> Paulo Matos
>


-- 
Best wishes,
Wei Wu (吴伟)
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