[Bug libfortran/51119] MATMUL slow for large matrices

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51119

--- Comment #39 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #38)
> 
> Jerry, what Netlib code were you basing your code on?

http://www.netlib.org/blas/index.html#_level_3_blas_tuned_for_single_processors_with_caches

Used the dgemm version from the download zip to start, stripped it of unneeded
code, converted to C with f2c, and further edits to clean it up.