https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104026
Andrew Stubbs <ams at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ams at gcc dot gnu.org --- Comment #6 from Andrew Stubbs <ams at gcc dot gnu.org> --- amdgcn always uses 64-lane vectors, regardless of type, and relies on masking to support anything smaller. The len_store pattern seems to have been introduced in July 2020 which is more recent than the last major work in the amdgcn backend.