From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id DEE783858C78; Fri, 29 Sep 2023 07:22:45 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DEE783858C78 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1695972165; bh=wjF4F/MFvUVdTae5zmTggr7jIZSG2uXvpednCjQEJ8I=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Xx7E3lysil6z+zVtcZd3Z+zDI6jbKgFu+Pls7LkYLJqVGVzjSUPvzswdc3DCxsqBR YFIzgJT9tPzNNhou9/ixqgYTw82+qATXYH5JuajKpGXBXnynyUKAEZfm94NECoMJaa 41vFVKby5vr/3lhZ10RBQ7qtCMJq61DFsz8L3IEI= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/110643] [13/14 Regression] aarch64: Miscompilation at O1 level (O0 is working) Date: Fri, 29 Sep 2023 07:22:45 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 13.1.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org 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: 13.3 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=3D110643 --- Comment #15 from Andrew Pinski --- Well the cvise reduced testcase is undefined code: template __tuple_element_t<__i, tuple<_Elements...>> get(tuple<_Elements...>) { double __trans_tmp_23{}; double *__trans_tmp_21 =3D &__trans_tmp_23; return __trans_tmp_21; } That returns a address to a local variable ... Which is why you get this warning: ``` : In function 'void hwy::AssertVecEqual(Vec >)': :174:45: warning: '__trans_tmp_23' is used uninitialized [-Wuninitialized] 174 | __trans_tmp_20 =3D *actual_lanes.get(); | ^ :42:10: note: '__trans_tmp_23' was declared here 42 | double __trans_tmp_23{}; | ^~~~~~~~~~~~~~ ```=