From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 4A9CF385AC22; Fri, 25 Jun 2021 08:01:37 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4A9CF385AC22 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/101197] __builtin_memmove does not perform constant optimizations Date: Fri, 25 Jun 2021 08:01:37 +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: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: marxin 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: Fri, 25 Jun 2021 08:01:37 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101197 --- Comment #4 from Jakub Jelinek --- Also, one will probably need to rename all the MOVE_* and *move_* stuff to COPY_* and *copy_* and reserve MOVE_* and *move_* for the overlapping copie= s.=20 And most likely on various arches it might need smaller size limits, becaus= e it will also depend on how many registers the target has (besides fixes/special ones or those that likely need to be used for the to and from addresses), s= ome small spilling might be ok, but heavy spilling would essentially mean memcp= y to a temporary spill area and memcpy back.=