Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!news.misty.com!news.iecc.com!.POSTED!nerds-end From: "Nils M Holm" Newsgroups: comp.compilers Subject: Re: Green Compiler ? Date: Sun, 23 Dec 2012 10:01:25 +0100 Organization: Compilers Central Lines: 19 Sender: johnl@iecc.com Approved: comp.compilers@iecc.com Message-ID: <12-12-013@comp.compilers> References: <12-12-010@comp.compilers> NNTP-Posting-Host: news.iecc.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: leila.iecc.com 1356307014 73386 64.57.183.58 (23 Dec 2012 23:56:54 GMT) X-Complaints-To: abuse@iecc.com NNTP-Posting-Date: Sun, 23 Dec 2012 23:56:54 +0000 (UTC) Keywords: code Posted-Date: 23 Dec 2012 18:56:54 EST X-submission-address: compilers@iecc.com X-moderator-address: compilers-request@iecc.com X-FAQ-and-archives: http://compilers.iecc.com Xref: csiph.com comp.compilers:797 Abid wrote: > Do we need to change this model and make it > three dimensional by adding power axis in the search space? In principle, I would say that higher execution speed equals more grenn-ness. Less time spent dissipating heat means less energy consumed. So the question actually is the same as ever: how to we make code run fast? - How do we squeeze more meaning into fewer/faster instructions? - How do we make code so small that it fits in caches? - How do we organize code execution in such a way that cache stalls are minimized? (Locality) -- Nils M Holm < n m h @ t 3 x . o r g > www.t3x.org