From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9C38D3858414; Mon, 6 Dec 2021 11:59:32 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9C38D3858414 From: "avi at scylladb dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/103554] -mavx generates worse code on scalar code Date: Mon, 06 Dec 2021 11:59:32 +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: 11.2.1 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: avi at scylladb dot com X-Bugzilla-Status: NEW 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Dec 2021 11:59:32 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103554 --- Comment #7 from Avi Kivity --- Sorry, I was unclear. That's the entire program with a huge number of slp opportunities. Each iteration in the program is ~40k instructions. It's not directly related to the test case, which is artificial, and arose from me exploring the differences between gcc and clang code generation. It does demonstrate that clang's slp is counterproductive. I promise to rep= eat the experiment with gcc once it stops ICEing.=