[Bug tree-optimization/106293] [13/14 Regression] 456.hmmer at -Ofast -march=native regressed by 19% on zen2 and zen3 in July 2022

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106293

--- Comment #22 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #21)
> Fixing loop distribution and vectorizer profile update seems to do the trick
> with profile feedback. Without we are still worse than in July last year on
> zen2 tester (zen3 and ice lake seems to behave differently perhaps due to
> different vectorization decisions)
> 
> https://lnt.opensuse.org/db_default/v4/SPEC/graph?highlight_run=38536&plot.
> 0=476.180.0
> 
> shows two jumps last year.
> g:d489ec082ea21410 (2022-06-30 16:46) and 3731dd0bea8994c3 (2022-07-04 00:16)

On a machine very similar to lntzen3, hmmer binary built with these
two revisions ran for pretty much the same time.

> g:3731dd0bea8994c3 (2022-07-04 00:16) and 07dd0f7ba27d1fe9 (2022-07-05 14:05)

Bisecting in this range led to g:d2a89866660 but that is the commit
referenced in the summary of this bug.