Re: [PATCH][RFC]Overloading intrinsics

[Janne Blomqvist <blomqvist dot janne at gmail dot com>]

On Mon, Oct 29, 2018 at 3:49 PM Martin Liška <mliska@suse.cz> wrote:

> Hi.
>
> Unlike the C and C++ front-ends, GNU Fortran does not know about
> vector implementations of math routines provided by GLIBC. This
> prevents vectorization of many loops which is a frequent cause of
> performance that is worse than compilers with their own math library
> such as ICC.
>
> The purpose of the patch is to provide a mechanism that will tell Fotran FE
> which intrinsics have simd cloned in math library.
>
> I've been cooperating with Paul and we came to a proof-of-concept that
> consists
> of 2 parts (patches):
>
> The first patch adds support for inclusion a module via
> command line. The module will be provided by glibc in order to synchronize
> which functions
> are provided by a glibc version. Paul is suggesting to maybe include that
> into load machinery
> of IEEE module.
>

Would this module be provided by glibc in source form, and included, or
would glibc provide a .mod file?

The problem is that the gfortran module format tends to change for every
release, so the glibc provided module would then only be compatible with
the version glibc was compiled with. I think we should try to avoid such a
situation.

Also, I suppose it would also be possible to use this same mechanism to
provide a similar module for svml, or other vector math libs? If not
shipped as part of gcc, or said math library, maybe as a separate 3rd party
project?

-- 
Janne Blomqvist