From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 0C3903858404; Wed, 2 Nov 2022 00:29:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0C3903858404 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1667348971; bh=lSpU4AlZo9nEntSKckTmd/4o1xk92SGQ7Lxqoc1zOMQ=; h=From:To:Subject:Date:In-Reply-To:References:From; b=AgZGMCQwdho0fSRP5M4+ZZ5RlyrhdcS6gydakWU1HaAqPwSK/DAdSYDhef3vX/cRB f5/8hcF8rVGmjOFYbjPL1MwhgfBB+4nbkqIxe+FdOlbmH8mK2CcNvqpSzSYyPzcQaQ Unf3UMAhwIhRmlKve93Li0onJx0Oepep9y/Aiu9A= From: "rvmallad at amazon dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107413] Perf loss ~14% on 519.lbm_r SPEC cpu2017 benchmark with r8-7132-gb5b33e113434be Date: Wed, 02 Nov 2022 00:29:30 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 13.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: rvmallad at amazon 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: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107413 --- Comment #8 from Rama Malladi --- (In reply to Wilco from comment #7) > The revert results in about 0.5% loss on Neoverse N1, so it looks like the > reassociation pass is still splitting FMAs into separate MUL and ADD (whi= ch > is bad for narrow cores). Thank you for checking on N1. Did you happen to check on V1 too to reproduce the perf results I had? Any other experiments/ tests I can do to help on th= is filing? Thanks again for the debug/ fix.=