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From: "rguenth 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: Wed, 02 Aug 2023 09:42:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106293

--- Comment #25 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #24)
> g:2e93b92c1ec5fbbbe10765c6e059c3c90d564245 fixes the profile update after
> cancelled distribution. However it does not help hmmer since we actually
> vectorize that loop iterating 0 times.  We need to figure out proper
> iteration count for that and convince loop distribution and vectorizer to=
 do
> nothing on it.

or use a smaller VF?  I doubt the scalar loop iterates zero times?=