Hello Louis, Sunday, February 22, 2009, 2:30:23 AM, you wrote:
yes, you are right. Don also compared results of 64x-reduced computation with full one. are you think that these results are more fair? > Observation: > The best gcc result shown in the thread, if I recall, precomputed > the result of the full computation at compiletime and simply > outputted it, when we looked at the assembly. > While I will accept that this could be seen as an optimization GHC > should have made, I do not accept that this will be the case with > most everyday code a programmer writes, as most code is not used to > simply compute arithmetic constants. > > For code that actively requires computation at runtime, I have seen > no examples of an instance where well-optimized GHC is actually > dozens or hundreds of times slower than GCC output. > Louis Wasserman > wasserman.lo...@gmail.com > > On Sat, Feb 21, 2009 at 5:21 PM, Bulat Ziganshin > <bulat.zigans...@gmail.com> wrote: > Hello Louis, > > Saturday, February 21, 2009, 4:16:10 AM, you wrote: > >> In the meantime, a brief summary: > > > a minor correction: the best gcc result shown in the thread was 50x > faster than Don's one, so you need to miltiple all ratios by a factor > of 50 > >> Straightforward and simple Haskell code, written by an individual >> aware of issues with tail recursion and stream fusion, is frequently >> within 3x the speed of GCC code when compiled with appropriate >> optimizations in GHC. > > > yes, within 150x margin > >> When performance is an absolute necessity, >> Haskell code can sometimes be manually modified (e.g. with manual >> loop unrolls) to equal GCC in performance. > > > yes, to make it only 50x slower while being only 7 times larger (i > mean source lines) > >> Can we move on? > > yes, we can! :) > > > -- > Best regards, > Bulat mailto:bulat.zigans...@gmail.com > > > -- Best regards, Bulat mailto:bulat.zigans...@gmail.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe