From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id C2CDA3858D39; Fri, 26 Nov 2021 11:58:57 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C2CDA3858D39 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/103393] [12 Regression] Generating 256bit register usage with -mprefer-avx128 -mprefer-vector-width=128 Date: Fri, 26 Nov 2021 11:58:57 +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: 12.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 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: Fri, 26 Nov 2021 11:58:57 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103393 --- Comment #20 from Jakub Jelinek --- The aarch64 MOVE_MAX definition of (UNITS_PER_WORD * 2) clearly doesn't mat= ch the documentation, because with Neon/SVE around, you can move quickly much = more bytes by a single instruction than that. And the gimple-fold.c change was = just a workaround for that.=