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Date: Fri, 21 Jul 2023 19:13:20 +0200
From: Jan Hubicka <hubicka@ucw.cz>
To: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
Cc: gcc-bugs@gcc.gnu.org
Subject: Re: [Bug target/110758] [14 Regression] 8% hmmer regression on
 zen1/3 with -Ofast -march=native -flto between g:8377cf1bf41a0a9d
 (2023-07-05 01:46) and g:3a61ca1b9256535e (2023-07-06 16:56);
 g:d76d19c9bc5ef113 (2023-07-16 00:16) and g:a5088dc3f5ef73c8 (2023-07-17
 03:24)
Message-ID: <ZLq8sLlCD7oLiIUZ@kam.mff.cuni.cz>
References: <bug-110758-4@http.gcc.gnu.org/bugzilla/>
 <bug-110758-4-BntFXrkXqW@http.gcc.gnu.org/bugzilla/>
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> I suspect this is most likely the profile updates changes ...
Quite possibly. The goal of this excercise is to figure out if there are
some bugs in profile estimate or whether passes somehow preffer broken
profile or if it is just back luck.

Looking at sphinx and fatigue it seems that LRA really may preffer
increased profile counts in peeled vectorized loop since it does not
understand the fact that putting spill on critical path through the
dependnecy graph of the code is not good for out of order execution.