Date: Fri, 18 Feb 2000 13:05:54 +0100 From: Marc Lehmann To: pgcc AT delorie DOT com Cc: law AT sgi DOT com Subject: Re: Big slowdown on -mpentium/-mpentiumpro, short_int add Message-ID: <20000218130553.C1399@cerebro.laendle> Mail-Followup-To: pgcc AT delorie DOT com, law AT sgi DOT com References: <38AC20C0 DOT 55E33FA4 AT sgi DOT com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <38AC20C0.55E33FA4@sgi.com>; from law@sgi.com on Thu, Feb 17, 2000 at 08:24:32AM -0800 X-Operating-System: Linux version 2.2.14 (root AT cerebro) (gcc version 2.95.1 19990816 (release)) Reply-To: pgcc AT delorie DOT com Errors-To: dj-admin AT delorie DOT com X-Mailing-List: pgcc AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk On Thu, Feb 17, 2000 at 08:24:32AM -0800, Linda Walsh wrote: > Showed about a 30-40% slowdown when using the -mpentium or -mpentiumpro on which cpu, and slowdown compared to what? > Note the test suite is copyright, but I'm excerpting this section for > educational (to demonatrate a problem) purposes. Das that make it more legal ;) Anyway, thanks a lot for the snippet! I do not know the reason for the slowdown (yet), but "short" is about the slowest datatype for pentium-type systems, and it could very well be that suboptimal scheduling even of a single insns can make such a large difference. -- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg AT opengroup DOT org |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | |