Author: Dann Corbit
Date: 14:09:26 09/10/01
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On September 10, 2001 at 16:37:55, James Swafford wrote: >On September 10, 2001 at 15:26:39, Dann Corbit wrote: > >>On September 10, 2001 at 05:17:25, Edward Seid wrote: >> >>Eventually, if you want the last little bit of speed out of your program, you >>will want to get a really good commercial compiler. > >I have seen cases in which cygwin outperformed VC6 with full optimizations. >In your experience, how much better are the commercials? We're talking >integer ops here, specifically for chess programming. 5%? 10%? I have never seen Cygwin (or Borland) even come close to the MS VC++ or Intel C++ compilers. I test mostly on high level chips (AMD Athlon and Intel P4) and there may not be nearly so large a difference on older CPUs. About 1/3 performance increase is typical. Sometimes a lot more. Sometimes, it is very dramatic. Here is a quote from an email by a friend: "I have compared the numbers... unbelievable... it is really nearly two times faster... move gen 3 times... the numbers looks like they are from completely different machines... unbelievable... totally... missing words..."
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