[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 #19 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
If I can get something working I am thinking something like -fexternal-blas-n,
if -n not given then default to current libblas behaviour. This way users have
some control. With GPUs, it is not unusual to have hundreds of cores.  We can
also, at run time, see if the opencl is already initialized which may mean used
elsewhere so don't mess with it.