https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78114
--- Comment #7 from amker at gcc dot gnu.org --- Here is the reason failing with haswell. The loop is vectorized by vf=4, but iteration distance for all possible predictive commoning chains are at most 2 (by iterations), so after vf=4 vectorization, there is no predictive commoning opportunities.
