From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 1D0CB3858C54; Fri, 2 Sep 2022 12:13:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1D0CB3858C54 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1662120820; bh=TbRbpQD5XH1SOpzqFf7QJkzvemG3V/HeAIcNkCNTpCE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=LTP+kcvbfNqCFQgzZGhwfX6f9HlJLxMeB7/rIhhPaBWdkM5B1ut/+up/38VYkqnhH vZKHxK2ikgYtVDB0NYu62dweffx5h4OYC+66/IEKJ1aHmu2bttm19WF5LdUm65cF9W jcnmxx5wzbFwZEOaiEQKFMztarGKtVWB1k4XfATo= From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106809] [12/13 regression] large bison grammars compilation got a lot slower, mainly due to -Wuninitialized Date: Fri, 02 Sep 2022 12:13:39 +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: 12.2.1 X-Bugzilla-Keywords: compile-time-hog X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth 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: 12.3 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106809 --- Comment #8 from Richard Biener --- A real speed improvement to dominated_by_w_unex would record the single kno= wn executable predecessor and successor of each block, for example in rpo_stat= e, but that's released before PRE eventually calls into it again via eliminate_with_rpo_vn. Some less hackish plumbing to manage lifetime is necessary here.=