From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 38BA03858408; Tue, 28 Sep 2021 06:57:29 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 38BA03858408 From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/102494] Failure to optimize vector reduction properly especially when using OpenMP Date: Tue, 28 Sep 2021 06:57:28 +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: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com 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: --- 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, 28 Sep 2021 06:57:29 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102494 --- Comment #7 from Hongtao.liu --- After supporting v4hi reduce, gimple seems not optimal to convert v8qi to v= 8hi. 6 vector(4) short int vect__21.36; 7 vector(4) unsigned short vect__2.31; 8 int16_t stmp_r_17.17; 9 vector(8) short int vect__16.15; 10 int16_t D.2229[8]; 11 vector(8) short int _50; 12 vector(8) short int _51; 13 vector(8) short int _52; 14 vector(8) short int _53; 15 vector(8) short int _54; 16 vector(8) short int _55; 18 [local count: 189214783]: 19 vect__2.31_97 =3D [vec_unpack_lo_expr] a_90(D); 20 vect__2.31_98 =3D [vec_unpack_hi_expr] a_90(D); 21 vect__21.36_105 =3D VIEW_CONVERT_EXPR(vect__2.31_9= 7); 22 vect__21.36_106 =3D VIEW_CONVERT_EXPR(vect__2.31_9= 8); 23 MEM [(short int *)&D.2229] =3D vect__21.36_105; 24 MEM [(short int *)&D.2229 + 8B] =3D vect__21.36_1= 06; 25 vect__16.15_47 =3D MEM [(short int *)&D.2229];=