http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57796
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- By tuning I've meant the vectorizer cost model. If the desirability of gathers vs. no vectorization at all doesn't depend only on the insns in the loop, but also on how many iterations the loop has, then perhaps we'd need to runtime version it or something.
