>
> Alternatively only enable loop vectorization at -O2 (the above checks
> flag_tree_slp_vectorize as well). At least the cost model kind
> does not have any influence on BB vectorization, that is, we get the
> same pros and cons as we do for -O3.
>
> Did anyone benchmark -O2 -ftree-{loop,slp}-vectorize separately yet?
I did last year and most perofmrance changes was tree-loop-vectorize as
expected. I will re-run the benchmarks now.
Honza
>
> Richard.
