From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23303 invoked by alias); 18 Feb 2009 13:02:58 -0000 Received: (qmail 23091 invoked by uid 48); 18 Feb 2009 13:02:43 -0000 Date: Wed, 18 Feb 2009 13:02:00 -0000 Message-ID: <20090218130243.23090.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug rtl-optimization/17387] Redundant zero extension instructions in loop optimization In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "bonzini at gnu dot org" 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: 2009-02/txt/msg01600.txt.bz2 ------- Comment #23 from bonzini at gnu dot org 2009-02-18 13:02 ------- > Gcc doesn't know/remember > > movl S(,%rax,4), %eax > > will zero extend to 64bit. I don't know you can touch only the lower > 32bit bits. This could be fixed by LOAD_EXTEND_OP, right? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17387