https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123074
--- Comment #1 from Robin Dapp <rdapp at gcc dot gnu.org> --- We fall back to single-lane SLP and re-start analysis. Here, at some point in vectorizable_load we fail to initialize loop_lens. At that point we have loop_vinfo.using_partial_vectors_p = false but loop_vinfo.using_select_vl_p = true. The latter is dependent on partial vectors... My suspicion is we don't reset using_select_vl_p before starting over. Testing a patch.
