From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14755 invoked by alias); 28 Dec 2005 16:53:29 -0000 Received: (qmail 14736 invoked by uid 48); 28 Dec 2005 16:53:27 -0000 Date: Wed, 28 Dec 2005 16:53:00 -0000 Message-ID: <20051228165327.14735.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug target/25500] [4.0/4.1/4.2 Regression]: SSE2 vectorized code is many times slower on 4.x.x than on 3.4.4 In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "jakub at gcc dot gnu dot org" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2005-12/txt/msg02740.txt.bz2 List-Id: ------- Comment #13 from jakub at gcc dot gnu dot org 2005-12-28 16:53 ------- Benchmarking -mtune=i386 tuned code on Athlon64 is simply a bad idea. Either you need to tune for your CPU (or at least some contemporary one like -mtune=pentium4 if you want to run quickly on a wider range of CPUs), or you should be benchmarking on real i386 hardware. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25500