From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 4047A3858CDB; Fri, 14 Jul 2023 07:16:36 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4047A3858CDB
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1689318996;
	bh=xCdPS8dNiQM4Mi2SDgKTcJUYZ6ZbkJzGA4zdpzHHwd0=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=XYc/HPRoXIhG76MsjZpLZfCi91XH0B6T4CsEAB2sl42RzlQtfc3C3VL46w4wWOHGs
	 B8yfFKGIAyCvdKKIydXrLEnkwxmKCe+BNOVTw21i015LhbF1YYNgo9U2ADSxPgQl7W
	 yJzQcwo9hImSh+btu1+y6fDGwDUqBnAmdcv6nRBA=
From: "hliu at amperecomputing dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110649] [14 Regression] 25% sphinx3 spec2006 regression
 on Ice Lake and zen between g:acaa441a98bebc52 (2023-07-06 11:36) and
 g:55900189ab517906 (2023-07-07 00:23)
Date: Fri, 14 Jul 2023 07:16:35 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization, needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hliu at amperecomputing dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-110649-4-QLK6H2oNcx@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110649-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110649-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110649

--- Comment #2 from Hao Liu <hliu at amperecomputing dot com> ---
Hi, I bisected the following 3 commits (sequantial):

  [v3] 3a61ca1b925 - Improve profile updates after loop-ch and cunroll
(2023-07-06) <Jan Hubicka>
  [v2] d4c2e34deef - Improve scale_loop_profile (2023-07-06) <Jan Hubicka>
  [v1] 224fd59b2dc - Vect: use a small step to calculate induction for the
unrolled loop (PR tree-optimization/110449) (2023-07-06) <Hao Liu OS>

Tests the time in seconds of 1-copy performance of 482.sphinx3 on zen2:
  v3: 261s
  v2: 231s
  v1: 231s

So the regression should be caused by 3a61ca1b925, i.e.
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommit;h=3D3a61ca1b9256535e1bfb19b=
2d46cde21f3908a5d=