From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 08D5E3858403; Fri, 24 Sep 2021 15:55:52 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 08D5E3858403
From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91292] Mangler incorrectly handles negative numbers in
 expressions
Date: Fri, 24 Sep 2021 15:55:51 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 9.1.0
X-Bugzilla-Keywords: ABI, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppalka at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cc
Message-ID: <bug-91292-4-AZs6InMCCH@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-91292-4@http.gcc.gnu.org/bugzilla/>
References: <bug-91292-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 24 Sep 2021 15:55:52 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91292

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
> According to http://itanium-cxx-abi.github.io/cxx-abi/abi.html#expression=
s , a negative number isn't treated as a negative literal; it is a negated =
number.  This means that it is mangled as though it were positive, and then=
 its negation is mangled.  So -1 and -(1) are treated the same.

Hmm, but according to
http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling.literal the mang=
ling
of a negative integer literal is prefixed with "n", and according to
http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.operator-name the
mangling of -<expr> is prefixed with "ng".  So I don't see why -1 and -(1)
should be given the same mangling.  ISTM GCC is already getting the mangling
right.=