From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 76ACA383802E; Thu, 22 Jul 2021 22:08:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 76ACA383802E From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: =?UTF-8?B?W0J1ZyBjKysvOTI1NTldIFJldHVybmluZyBzdGTiiLdtYXAgYnJl?= =?UTF-8?B?YWtzIHRhaWwtcmVjdXJzaW9uIG9wdGltaXphdGlvbg==?= Date: Thu, 22 Jul 2021 22:08:39 +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: 9.2.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: NEW 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 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: Thu, 22 Jul 2021 22:08:39 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92559 --- Comment #2 from Andrew Pinski --- I don't think this can ever be optimized. Mainly because there are copies happening due to passing via value and returning by value. If I change it to foo to MyMap &foo(MyMap &m), I get the behavior you want.=