From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-387711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 19086 invoked by alias); 31 Mar 2012 22:42:23 -0000
Received: (qmail 19077 invoked by uid 22791); 31 Mar 2012 22:42:20 -0000
X-SWARE-Spam-Status: No, hits=-3.0 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
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, 31 Mar 2012 22:42:08 +0000
From: "jhaberman at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/52813] New: %rsp in clobber list is silently ignored
Date: Sat, 31 Mar 2012 22:53:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: inline-asm
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jhaberman at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-52813-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-03/txt/msg02764.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52813

             Bug #: 52813
           Summary: %rsp in clobber list is silently ignored
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jhaberman@gmail.com


The following test program crashes even though I correctly listed %rsp as
clobbered:

--

int main() {
  asm volatile ("movq $0, %%rsp" : : : "%rsp");
  return 0;
}

--

I would prefer gcc to error out in this case instead of silently ignoring my
instruction.