From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 783B73885C0F; Mon, 12 Jul 2021 11:26:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 783B73885C0F From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/101419] [9/10/11/12 Regression] collapsing memset() calls can break __builtin_object_size() Date: Mon, 12 Jul 2021 11:26:12 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub 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: 9.5 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: Mon, 12 Jul 2021 11:26:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101419 --- Comment #9 from Jakub Jelinek --- The above patch will slightly pessimize optimizations during the NEXT_PASS (pass_remove_cgraph_callee_edges); /* Initial scalar cleanups before alias computation. They ensure memory accesses are not indirect wherever possible. */ NEXT_PASS (pass_strip_predict_hints, false /* early_p */); NEXT_PASS (pass_ccp, true /* nonzero_p */); NEXT_PASS (pass_post_ipa_warn); /* After CCP we rewrite no longer addressed locals into SSA form if possible. */ NEXT_PASS (pass_complete_unrolli); NEXT_PASS (pass_backprop); NEXT_PASS (pass_phiprop); NEXT_PASS (pass_forwprop); passes right after IPA, where we currently only pessimize it before and dur= ing IPA.=