https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91201
--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #7) > Untested patch to add the reduc_plus_scal_v{16,32,64}qi expanders. > Wonder if we don't need also reduc_plus_scal_v8qi expander for > TARGET_MMX_WITH_SSE. I was even kind of hoping that reduc_plus_scal_v8qi would be the only one needed, with v16qi reducing to it the same way you reduce v32qi and v64qi to v16qi, but that's probably too optimistic because of MMX.