From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id A1AD8398F003; Wed, 10 Feb 2021 16:49:08 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A1AD8398F003 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/38474] compile time explosion in dataflow_set_preserve_mem_locs at -O3 Date: Wed, 10 Feb 2021 16:49:08 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 4.4.0 X-Bugzilla-Keywords: compile-time-hog, memory-hog, patch X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth 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: Wed, 10 Feb 2021 16:49:08 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D38474 --- Comment #93 from Jakub Jelinek --- I think I'd go for more chains by default, at least 64 or even 256, with a param and tracking on how many we have in a counter. The class has a ctor/dtor, so the increment/decrement of the counter can be done there. And I think it is doubly-linked, so tail should be prev on the head.=