From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12734 invoked by alias); 28 Mar 2013 23:08:13 -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 12640 invoked by uid 48); 28 Mar 2013 23:08:01 -0000 From: "burnus at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/41115] Tree-vectorizer: VecCost tuning for X2: Without vectorization 30% faster Date: Thu, 28 Mar 2013 23:08:00 -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-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: burnus 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-Changed-Fields: CC Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 X-SW-Source: 2013-03/txt/msg02142.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41115 Tobias Burnus changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |burnus at gcc dot gnu.org --- Comment #4 from Tobias Burnus 2013-03-28 23:08:00 UTC --- (In reply to comment #3) > It would be nice to see where we are today with respect to the cost model / > vectorizing / not vectorizing. Answer: It became much worse (compared to GCC 4.5 of comment 0): Using gcc version 4.8.0 20130308 [trunk revision 196547], the induct runtimes are: gfortran -march=native -ffast-math -O3 -ftree-vectorize -fvect-cost-model induct.f90 real 0m47.142s / user 0m47.072s / sys 0m0.020s gfortran-4.8 -march=native -ffast-math -O3 -ftree-vectorize -fno-vect-cost-model induct.f90 real 0m35.713s / user 0m35.236s / sys 0m0.052s time gfortran-4.8 -march=native -ffast-math -O3 -fno-tree-vectorize induct.f90 real 0m47.837s / user 0m47.388s / sys 0m0.028s real 0m47.514s / user 0m47.428s / sys 0m0.044s gfortran -march=opteron -ffast-math -funroll-loops -fno-tree-vectorize -ftree-loop-linear -msse3 -O3 induct.f90 real 0m44.676s / user 0m44.640s / sys 0m0.032s gfortran-4.5 -march=opteron -ffast-math -funroll-loops -fno-tree-vectorize -ftree-loop-linear -msse3 -O3 induct.f90; time ./a.out real 0m34.591s / user 0m34.524s / sys 0m0.020s