From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 285C53858437; Tue, 11 Oct 2022 06:21:53 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 285C53858437 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1665469313; bh=uU7hvbD6iOsyz4S+tbZrpolTdfFFqUfjEgAQhmyLixk=; h=From:To:Subject:Date:In-Reply-To:References:From; b=a+TAvZ1GW0WSDv/cXwoN3RnpHeHCp5h4Jw6JaDodrWSoGQZ5fy3AJbFAuJX3wBdO6 1ZNs3lASC01PhawUNOOufp58QhCh6Py5qas9N1RqNH+t182PMIKA43ZprhUaiBYMmz sCgXpWqx6g410ra+fKOWHicewd+62QFphNsDbJIU= From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/54346] combine permutations Date: Tue, 11 Oct 2022 06:21:53 +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: 4.8.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: glisse at gcc dot gnu.org 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D54346 --- Comment #6 from Marc Glisse --- The log says that this breaks tree-ssa/forwprop-19.c, but I don't see any x= fail or anything. Does it only fail because gimple-simplify leaves some dead code around, so you could update the test to scan the next DCE pass dump instead= of forwprop1? Or are we missing a transformation that just detects a VEC_PERM_= EXPR with an identity permutation?=