http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57796
--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> --- (In reply to Jakub Jelinek from comment #3) > 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. Jakub, We have runtime versioning but for original bench vectorized version of loop is selected to execute, but if we change lower bound to 0 (as I did) scalar version of loop is run.
