[Bug libfortran/78379] Processor-specific versions for matmul

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379

--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Created attachment 40074
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40074&action=edit
Test program for benchmarks