From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 47C403954C45; Thu, 7 Jan 2021 08:34:23 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 47C403954C45 From: "nathanael.schaeffer at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/98563] [10/11 Regression] vectorization fails while it worked on gcc 9 and earlier Date: Thu, 07 Jan 2021 08:34:23 +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: 10.1.0 X-Bugzilla-Keywords: missed-optimization, openmp X-Bugzilla-Severity: normal X-Bugzilla-Who: nathanael.schaeffer at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 10.3 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: Thu, 07 Jan 2021 08:34:23 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98563 --- Comment #3 from N Schaeffer --- I'd like to add that when you say "vectorization of the basic block", the c= ode generated is actually worse than non-vectorized naive code: it handles all loads and arithmetic operations in scalar mode (v*sd instructions) and packs two values into xmm before storing...=