https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108322
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> --- On Tue, 10 Jan 2023, amonakov at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108322 > > --- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> --- > (In reply to Richard Biener from comment #4) > > > > For the case at hand loading two vectors from the destination and then > > punpck{h,l}bw and storing them again might be the most efficient thing > > to do here. > > I think such read-modify-write on the destination introduces a data race for > bytes that are not accessed in the original program, so that would be okay > only > under -fallow-store-data-races? Yes, obviously.
