[Bug tree-optimization/67683] Missed vectorization: shifts of an induction variable

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67683

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Right shifts are divisions so the result isn't an affine evolution.

Yes, you could enhance the vectorizer to not rely on scalar evolutions (only)
for reduction detection.