From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id F1398383237C; Fri, 21 Jun 2024 15:39:23 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F1398383237C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1718984363; bh=NeT04uX4Eu6A0BSkC1JSZ4U09lXgdT+UzGOUojTNJr8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=FSfIuky//QoRJWMxDQKObDJ26zqwtZ0Fa0HY9hZ0TwPKBeG4gspmRfXC41rEurreF taS5iyIHEL14rpyrIsSzksqmcY+lG/onHJmkDCVxbd/elVlWltDtkKBZL/62HxDzWc whv74BCO20ocV6lAZLWPscwJUMQ00KDG87ZtTC00= From: "tangyixuan at mail dot dlut.edu.cn" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/115582] [15 regression] wrong code when accessing members of incompatible type structure Date: Fri, 21 Jun 2024 15:39:23 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 15.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: tangyixuan at mail dot dlut.edu.cn X-Bugzilla-Status: WAITING 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: 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115582 --- Comment #4 from tangyixuan --- Thanks for your concerns. The type of "a.x" is converted to char in "(char = *)a + 1", and it may be confused in clang under -O0 vs -O{2,3}. gcc-15 outputs = the "int" value, but the previous versions like gcc-5.3 produce the "char" valu= e I guess.=