Author: Robert Hyatt
Date: 07:59:34 12/26/02
Go up one level in this thread
On December 26, 2002 at 10:49:52, Frank Phillips wrote: >On December 26, 2002 at 09:33:43, Eugene Nalimov wrote: > >>From my experience: Intel's compiler shines where application spent majority of >>its time in several tight loops. When execution time is more-or-less evenly >>spread across the large application it's more important to get shorter code than >>to emit locally optimal but longer code. >> >>Thanks, >>Eugene > >This seems consistent with an Intel 1.1 MByte executable compared to around 400 >kBytes for gcc. > >Frank It is probably unrelated to that. The size difference is most likely a library issue. IE my intel executables on linux are in the same size range is the executables for gcc 3.x. But both use ld.so-type shared libraries that are _not_ a part of the executable file while it sits on disk. > >> >>On December 25, 2002 at 22:34:41, Robert Hyatt wrote: >> >>>On December 24, 2002 at 10:55:17, Vincent Diepeveen wrote: >>> >>>>On December 24, 2002 at 04:47:21, Frank Phillips wrote: >>>> >>>>>On December 23, 2002 at 12:12:29, Vincent Diepeveen wrote: >>>>> >>>>>>On December 23, 2002 at 12:01:10, Robert Hyatt wrote: >>>>>> >>>>>>You forget the crucial data point and that's that you have >>>>>>no AMD K7s out there. >>>>> >>>>>Intel is about 30% faster than gcc3.2 (and gcc2.95 and gcc 2.96) with profile >>>>>guided optimisation for me on my AMD Athlons (Palomino and Thoroughbred). Not >>>>>all of this can be due to incompetence, I suggest. >>>>> >>>>>Frank >>>> >>>>you must be using bitboards then. No other option possible. >>>>profile guided optimization speeds me up 20% at k7 with gcc 3.x >>>> >>> >>> >>>How can you possibly say "no other option possible"??? >>> >>>Intel _also_ does profile-guided optimizations. But I can think of _lots_ >>>of reasons why he might get better results than you get. Starting with his >>>programming style which might be _better_...
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