From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id BFC083858D28; Sat, 13 Jan 2024 00:25:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BFC083858D28 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1705105518; bh=eX2a7h2J21koS51xcKnIxe1HVGq6xuK2WatOBquj7g8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=IJ6KVLw2g21Z6qztgH+2aoKzbsra8A1m1msRrPBiD6u1Ui0G8KQynit1eyloiXVFC oLpXd2U6S88qZ58S2CpmpKn8StjIw/K6PBHMFBF1sZi42igUh5wnpZDQTo/q7akLG1 AIu9T1hHemD25Jw3GKYTDCov2vJo6sbRkqhewpR4= From: "law at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/112398] Suboptimal code generation for xor pattern on subreg Date: Sat, 13 Jan 2024 00:25:15 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 14.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: law 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=3D112398 --- Comment #5 from Jeffrey A. Law --- I don't think we need to do any significant bit tracking to optimize the original neg8 test. I think we can be handled entirely within the simplify= -rtx framework. I've got a junior engineer that's going to take a peek at thi= s -- so don't go and fix it Andrew ;-)=