From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 795CF3857415; Thu, 17 Feb 2022 13:03:07 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 795CF3857415 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/104581] [12 Regression] Huge compile-time regression building SPEC 2017 538.imagick_r with PGO Date: Thu, 17 Feb 2022 13:03:07 +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: 12.0 X-Bugzilla-Keywords: compile-time-hog, needs-bisection X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 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, 17 Feb 2022 13:03:07 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104581 --- Comment #7 from Jakub Jelinek --- Ah, you're right. So, can't it instead of the quadratic walk just compare DF_INSN_LUID? If it isn't right after df_analyze and some insns could have been added in between, it would need to maintain the luids somehow (perhaps e.g. in the w= ay how we do it in tree-ssa-reassoc.cc, if we add insns, we must set their uid= to either the previous or next insn's uid and then can do some IL walk, but on= ly as long as the uid is the same, so unless everything in the bb changes it should be still cheap.=