From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 3BE0E3858430; Thu, 14 Apr 2022 20:49:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3BE0E3858430 From: "dmalcolm at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug analyzer/105264] -Wanalyzer-use-of-uninitialized-value gets confused about var + i v.s. &var[i] Date: Thu, 14 Apr 2022 20:49:21 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: analyzer X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dmalcolm at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Apr 2022 20:49:21 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105264 --- Comment #6 from David Malcolm --- There are some fiddly issues where the analyzer fails to figure out that pt= r + i and &ptr[i] refer to the same memory, for certain symbolic values of i. I'm testing a partial fix for GCC 12, which at least seems to fix the -Wanalyzer-use-of-uninitialized-value false positives identified in the reproducer. That said, I think for a deeper fix it's probably best to wait until GCC 13.=