From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id B326D3858D33; Thu, 13 Apr 2023 06:26:32 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B326D3858D33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1681367192; bh=2GE0rXpuQiTeKNS7ckcQjfw46+1vT3iGEq4trEo9ipM=; h=From:To:Subject:Date:In-Reply-To:References:From; b=sROHfQWVMtUUZBVcXnfzDfT5A6rgqNj1mBPThwKNeVjB4EHzECQZCLRYzkJQzQy71 VIQ5u0tJMFTEFZ217otf4rcfQog5A1zNaAfggR0/c7iJb8Ke9MOVUUWdHjF08o6V8h mKrdAFI6xPZt6879RReAjD3+RAuGfR96xcj3nf8U= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/109493] Broken O2 optimization on s390x in GCC 13 Date: Thu, 13 Apr 2023 06:26:32 +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: 13.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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=3D109493 --- Comment #1 from Andrew Pinski --- belt_mac_st* st =3D &state; belt_mac_st* st2 =3D &state2; ((word*)(st->s))[0] =3D 0, ((word*)(st->s))[1] =3D 0; ((word*)(st->r))[0] =3D 0, ((word*)(st->r))[1] =3D 0; st->filled =3D 0; I am 99% sure those are aliasing rule violations. Does -fno-strict-aliasing help?=