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 4C0233858D34; Tue, 26 May 2020 12:41:47 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4C0233858D34
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1590496907;
 bh=gTHxsstx2C+HRNvnYS0c+l7QwBGlGY5vBUpPBRM59rY=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=QZ6lSSotdPVCGGOfY5pdoo7s8cOgIbW8+xVo/i6voFNKYVqPpjJFWrcBzWkl2o7FJ
 3sT4T1mqtY5ch6Rul48jwqtvofmA1c6ZhKIEIVCdmT95/4p05rsHBf7q2Vtx1zd3d3
 IeFmNy/MC/Fb3DuS1fwU1lsLda3nF4F/PG9dFq/E=
From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/95326] GCC can not detect signed-integer-overflow
 correctly
Date: Tue, 26 May 2020 12:41:47 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: haoxintu at gmail dot com
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: 
Message-ID: <bug-95326-4-kTIR6hll1k@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95326-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95326-4@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: <http://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: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 26 May 2020 12:41:47 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95326

--- Comment #3 from Haoxin Tu <haoxintu at gmail dot com> ---
Would GCC shorten the multiple to be other types early as well? I also find
some cases in "short" type with the same symptom. I am still testing now and
don't know there are any cases in rest of types(such as char, int, long...)
have the problem.

By the way, should I file a new bug report when I found another type (for
example,int) that GCC can not detect the signed-integer-overflow UB issues?=