From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 868343857C7C; Tue, 2 Aug 2022 10:04:57 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 868343857C7C From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/106502] Three calls to __attribute__((const)) function Date: Tue, 02 Aug 2022 10:04:57 +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: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth 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: Tue, 02 Aug 2022 10:04:57 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106502 --- Comment #4 from Richard Biener --- Once you enable optimization a single cat () call remains (as expected). T= he FE does 9931 if (TREE_SIDE_EFFECTS (argarray[0])) 9932 argarray[0] =3D save_expr (argarray[0]); 9933 t =3D build_pointer_type (TREE_TYPE (fn)); 9934 fn =3D build_vfn_ref (argarray[0], DECL_VINDEX (fn)); but argarray[0] doesn't have TREE_SIDE_EFFECTS set, it even has TREE_READON= LY set on the CONVERT_EXPR wrapping the call. Note that save_expr would do nothing on this tree as well (because TREE_READONLY and !TREE_SIDE_EFFECTS)= .=