From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6091 invoked by alias); 9 Jul 2011 16:40:09 -0000 Received: (qmail 6081 invoked by uid 22791); 9 Jul 2011 16:40:09 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_GJ 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; Sat, 09 Jul 2011 16:39:56 +0000 From: "gjl at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/39633] [avr] loop bug X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal 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: --- 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: Sat, 09 Jul 2011 16:40:00 -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/msg00709.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39633 --- Comment #7 from Georg-Johann Lay 2011-07-09 16:39:24 UTC --- The bug is here: lsl r24 ashrqi3/5 sbc r24,r24 brne .L3 branch The SBC doc says: > Z: Previous value [of Z] remains unchanged when the > result [of SBC] is zero; cleared otherwise. I.e. the SBC leaves cc0 in a mess, and that's ashrqi3/5: "r,0,n" and "cc=clobber". I do not understand where the BRNE comes from because it's a conditional jump and cc0 is in a mess.