From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 13B52385782A; Thu, 18 Mar 2021 08:53:01 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 13B52385782A From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/99633] s1113 benchmark of TSVC is unrolled by icc and not by gcc and runs faster on znver3 Date: Thu, 18 Mar 2021 08:53:00 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 11.0 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: everconfirmed keywords cf_gcctarget bug_status cf_reconfirmed_on 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, 18 Mar 2021 08:53:01 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99633 Richard Biener changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Keywords| |missed-optimization Target| |x86_64-*-* Status|UNCONFIRMED |NEW Last reconfirmed| |2021-03-18 --- Comment #1 from Richard Biener --- I guess a heuristic could be to use the available load/store bandwith (for streaming loads/stores only) when load/store 'uops' (stmts/insns) dominate the loop. In the case of this loop we don't even need an epilogue so that's a plus as well. The inner loop could also be split at LEN_1D/2 to make the load of a[LEN_1D= /2] invariant in all but a single iteration (possibly not worth the trouble in = this case).=