Re: Optimization of spread

["Théo Cavignac" <theo.cavignac@gmail.com>]

Mikael, Thomas,
Thank you very much for being so welcoming.

> The source is actually more C than C++ (the fortran front-end at least).
That's good to know, I am much more comfortable with C.

> It requires little C++ skills, but time and willingness to decipher its complexity.
Yes, I don't expect that to be easy.

> There are two places where inlining can be done:
>  * In front-end passes where the parsed fortran code is rewritten
> before generating the intermediary code for the optimizers.  Thomas
> König can help you there.
>  * Directly in the code generation for the optimizers.  It is (much)
> more complex but can avoid the need for temporaries.  I can help you there.

My understanding of the compiler inner working being what it is, I
will try to have a look at the higher level side first.

> I most certainly can.  frontend-passes.cc contains, among other
> functionality, a function to inline MATMUL for small sizes, so
> much of the infrastructure is already there.
I will start my investigation there.

> > Some links about our development process and conventions:
> > https://gcc.gnu.org/contribute.html
> > https://gcc.gnu.org/git.html
>
> And, if you're into hacking gfortran, some starting pointers are at
> https://gcc.gnu.org/wiki/GFortranHacking . But always free feel to ask!
I am familiar with git, but I'll have to read the two other documents soon.

Thanks again, hopefully you'll ear about me a little later.

Best regards,
Théo

On Thu, Nov 3, 2022 at 11:04 PM Thomas Koenig <tkoenig@netcologne.de> wrote:
>
> Hi,
>
> Mikael beat me to a mail saying essentially the same things by
> a few minutes, so I'm just adding a few details.
>
> > There are two places where inlining can be done:
> >   * In front-end passes where the parsed fortran code is rewritten
> > before generating the intermediary code for the optimizers.  Thomas
> > König can help you there.
>
> I most certainly can.  frontend-passes.cc contains, among other
> functionality, a function to inline MATMUL for small sizes, so
> much of the infrastructure is already there.
>
> >   * Directly in the code generation for the optimizers.  It is (much)
> > more complex but can avoid the need for temporaries.  I can help you there.
> >
> > Some links about our development process and conventions:
> > https://gcc.gnu.org/contribute.html
> > https://gcc.gnu.org/git.html
>
> And, if you're into hacking gfortran, some starting pointers are at
> https://gcc.gnu.org/wiki/GFortranHacking . But always free feel to ask!
>
> Best regards
>
>         Thomas