From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3725 invoked by alias); 25 Jul 2011 12:49:34 -0000 Received: (qmail 3716 invoked by uid 22791); 25 Jul 2011 12:49:34 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_GJ,TW_LQ X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 25 Jul 2011 12:49:21 +0000 From: "gjl at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/29560] [avr] Poor optimization for byte shifts X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: gjl at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.0 X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Mon, 25 Jul 2011 12:49:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-07/txt/msg02115.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29560 --- Comment #9 from Georg-Johann Lay 2011-07-25 12:48:29 UTC --- Created attachment 24827 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24827 Fix PR29560 by adding peephole2 pattern. PR target/29560 * config/avr/avr.md: Add peephole2 to map ashlhi3 to ashlqi3 if high part of shift target is unused.