From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 7D3DD385803E; Fri, 13 May 2022 07:10:43 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7D3DD385803E From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/105513] [9/10/11/12/13 Regression] Unnecessary SSE spill since r9-5748-g1d4b4f4979171ef0 Date: Fri, 13 May 2022 07:10:43 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 12.1.0 X-Bugzilla-Keywords: missed-optimization, ra X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 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: Fri, 13 May 2022 07:10:43 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105513 --- Comment #4 from Hongtao.liu --- For pattern supports 'm' alternative, mem_cost is frequency which is quite = low compared to pp->costs (ira_register_move_cost[mode][rclass][hard_reg_class]= ) * frequency) For x86 backend even gpr->gpr cost is 2 which should be 2 * frequency in ira_cost, I think we should somehow increase costs for REG_P (op) but choo= se memory alternative. 928 if (op_class =3D=3D NO_REGS) 929 /* Although we don't need insn to reload from 930 memory, still accessing memory is usually more 931 expensive than a register. */ 932 pp->mem_cost =3D frequency;=