From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 32088 invoked by alias); 5 Jul 2013 13:49:31 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 31535 invoked by uid 48); 5 Jul 2013 13:49:26 -0000 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/57796] AVX2 gather vectorization: code bloat and reduction of performance Date: Fri, 05 Jul 2013 13:49:00 -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: 4.9.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-07/txt/msg00320.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57796 --- Comment #3 from Jakub Jelinek --- By tuning I've meant the vectorizer cost model. If the desirability of gathers vs. no vectorization at all doesn't depend only on the insns in the loop, but also on how many iterations the loop has, then perhaps we'd need to runtime version it or something.