https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379
Bug ID: 78379
Summary: Processor-specific versions for matmul
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
Now that a patch for PR51119 is in, we can think about
inserting processor-specific versions.
target_clones looks to be a good idea for this, see
https://gcc.gnu.org/onlinedocs/gcc-6.2.0/gcc/Common-Function-Attributes.html
There are still a few issues to be resolved, for example which
architectures to chose. Also, selecting an architecture which does
not exist on the platform leads to errors, so we probably need
to guard with appropriate #ifdefs.
A wrapper function to call the actual matmul is probably a good idea,
because it is the caller who generates the code to select.
