From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id DB65F3858400; Fri, 12 Nov 2021 10:27:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DB65F3858400 From: "hubicka at kam dot mff.cuni.cz" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103195] [12 Regression] tfft2 text grows by 70% with -Ofast since r12-5113-gd70ef65692fced7a Date: Fri, 12 Nov 2021 10:27:52 +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: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hubicka at kam dot mff.cuni.cz 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: Fri, 12 Nov 2021 10:27:53 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103195 --- Comment #3 from hubicka at kam dot mff.cuni.cz --- > > threader stuff would be my bet, but we need to bisect this (tfft2 is al= so > > quite small) >=20 > Bad bet ;) It's caused by r12-5113-gd70ef65692fced7a. Hehe, that was my guess yeterday. Thanks for confirming. So now to figure out why better alias info makes tfft2 grow. I guess more vectorization? Thanks for bisecting this=