From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 17519 invoked by alias); 13 Sep 2002 13:46:07 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 17478 invoked by uid 71); 13 Sep 2002 13:46:03 -0000 Resent-Date: 13 Sep 2002 13:46:03 -0000 Resent-Message-ID: <20020913134603.17477.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, ben@zeus.com Received: (qmail 16202 invoked by uid 61); 13 Sep 2002 13:38:45 -0000 Message-Id: <20020913133845.16201.qmail@sources.redhat.com> Date: Fri, 13 Sep 2002 06:46:00 -0000 From: ben@zeus.com Reply-To: ben@zeus.com To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above X-SW-Source: 2002-09/txt/msg00226.txt.bz2 List-Id: >Number: 7909 >Category: optimization >Synopsis: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Fri Sep 13 06:46:02 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Ben >Release: 3.2 >Organization: >Environment: Compiling native code for a ia64 box >Description: The code sample is a fairly ugly routine to convert pointers into a hex string. The code compiles fine with all levels of optimisation. However, with -O2 and above, gcc reports the following warning messages: /tmp/cc2HCufe.s: Assembler messages: /tmp/cc2HCufe.s:133: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 14 /tmp/cc2HCufe.s:133: Warning: Only the first path encountering the conflict is reported >How-To-Repeat: Compile the code with -O2 or above. No other compile flags required. >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/x-csrc; name="gccia64.c" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="gccia64.c" I2luY2x1ZGUgPHN0ZGlvLmg+CgpzdGF0aWMgCmNvbnN0IHVuc2lnbmVkIGNoYXIgbjJ4WzE2XSA9 IHsgJzAnLCAnMScsICcyJywgJzMnLCAnNCcsICc1JywgJzYnLCAnNycsCiAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgJzgnLCAnOScsICdhJywgJ2InLCAnYycsICdkJywgJ2UnLCAnZicg fTsKCgppbnQKbWFpbiggaW50IGFyZ2MsIGNoYXIgKiphcmd2ICkKewogICBjaGFyIGJ1ZmZbIDI1 NiBdOwogICBjaGFyICpxID0gYnVmZjsKCiAgIHZvaWQgKnB0ciA9ICh2b2lkICopIDB4MDEyMzQ1 Njc7CiAgIGNvbnN0IHVuc2lnbmVkIGNoYXIgKm51bSA9ICh1bnNpZ25lZCBjaGFyICopICZwdHI7 CiAgIGNvbnN0IHVuc2lnbmVkIGNoYXIgKnRvcCA9IG51bSArIHNpemVvZiggdm9pZCAqICk7CiAg IAogICAqcSsrID0gJzAnOwogICAqcSsrID0gJ3gnOwoKICAgaWYoIHB0ciA9PSAwICkgKnErKyA9 ICcwJzsKICAgZWxzZSB3aGlsZSggbnVtICE9IHRvcCApIHsKICAgICAgY29uc3QgaW50IGJ5dGUg PSAqLS10b3A7CiAgICAgIGNvbnN0IGludCB1cHBlcm5pYmJsZSA9IChieXRlICYgMHhmMCkgPj4g NDsKICAgICAgaWYoIHEgIT0gYnVmZisyIHx8IHVwcGVybmliYmxlICkgKnErKyA9IG4yeFsgdXBw ZXJuaWJibGUgXTsKICAgICAgY29uc3QgaW50IGxvd2VybmliYmxlID0gYnl0ZSAmIDB4ZjsKICAg ICAgaWYoIHEgIT0gYnVmZisyIHx8IGxvd2VybmliYmxlICkgKnErKyA9IG4yeFsgbG93ZXJuaWJi bGUgXTsKICAgfQoKICAgKnErKyA9ICdcMCc7CiAgIHByaW50ZiggIiVzXG4iLCBidWZmICk7Cn0K