From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 193AD385841E; Tue, 1 Nov 2022 12:48:48 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 193AD385841E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1667306928; bh=/mIJWWxSQdNEYzCKvRQd00Bp3VJ4vflYqLs3x+OkqPY=; h=From:To:Subject:Date:In-Reply-To:References:From; b=THF9OWZjCP8DMY//uCI/fQ9EGvmdZyUjA70MlSThygVdNyvJr/NsB+mEhZlTGSXwB 4lXKBFlrm95+/8hDzveh59sD9zGrKD8r1d3u/2wnZSV2TgWLlATa7Xtyy2l3708LvY A5pgAUXENvl7Fuud4b1+8bVUgy+WP/hovQzmLQWU= From: "wilco at gcc dot gnu.org" 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: Tue, 01 Nov 2022 12:48:46 +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: wilco at gcc dot gnu.org 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 #7 from Wilco --- (In reply to Rama Malladi from comment #5) > So, looks like we aren't impacted much with this commit revert. >=20 > I haven't yet tried fp_reassoc_width. Will try shortly. 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 (which= is bad for narrow cores).=