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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106293] [13/14 Regression] 456.hmmer at
 -Ofast -march=native regressed by 19% on zen2 and zen3 in July 2022
Date: Mon, 31 Jul 2023 07:44:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106293

--- Comment #21 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
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=3D38536&plo=
t.0=3D476.180.0

shows two jumps last year.
g:d489ec082ea21410 (2022-06-30 16:46) and 3731dd0bea8994c3 (2022-07-04 00:1=
6)
g:3731dd0bea8994c3 (2022-07-04 00:16) and 07dd0f7ba27d1fe9 (2022-07-05 14:0=
5)

Which seems both different from the patch listed (which is even older).
Optically it seems that second jump is gone, but it is hard to tell a year
later.
Martin, it would be great to bisect these two.=