Author: Matt Taylor
Date: 13:21:19 12/19/02
Go up one level in this thread
On December 19, 2002 at 12:31:15, Robert Hyatt wrote: >On December 19, 2002 at 12:00:32, Vincent Diepeveen wrote: > >>On December 19, 2002 at 11:43:22, Robert Hyatt wrote: >> >>>On December 19, 2002 at 09:43:54, Vincent Diepeveen wrote: >>> >>>>On December 19, 2002 at 07:53:32, Frederic Louguet wrote: >>>> >>>>>My program Chess Wizard has always run much faster on Athlon than on P4, but >>>>>maybe using default optimizations is not enough. So I have a question for >>>>>compiler gurus : what are the best compiler optimizations you can use under >>>>>Microsoft Visual C++ 6.0 with processor pack, running under Windows XP, for >>>>>Athlon XP/MP and for Pentium 4. >>>>> >>>>>Before I try everything myself, maybe someone has made experiments and has >>>>>interesting results to share ? >>>> >>>>Yes. >>>> >>>>Try mingw with msys. >>>>it works under windows. >>>> >>>>download the latest gcc compiler. >>>>then compile a version with profile info. produce profile >>>>info. then recompile with that and branches get optimized. >>>> >>>>should get your chess wizard, assuming it's a non-bitboard (gcc >>>>is horrible optimizing 64 bits code for 32 bits processors), a lot >>>>faster. >>>> >>>>It sure works for diep very fast. >>> >>> >>>Also he should try the Intel C/C++ compiler v 7.0 download from Intel's >>>web site. It produces faster code for me than any version of gcc that is >>>available. >> >>you have a P4. he has an AMD K7. I bet even old visual c++ 6.0 sp4 procpack >>beats the intel 7.0 on that hardware ;) > > >I suppose that is the _big_ difference between us. I prefer to _test_ and >produce data that can be used to make a decision. Rather than "guesswork". The least he could do is read the optimization manuals and make a clever observation. You might as well call the Athlon optimization manual the P4 Jr. optimization manual. The bulk of the manuals are identical concepts with different wording and style. I have seen a number of tests which pretty much confirm that P4-optimized code is going to fly on Athlon, too. It won't be *best* on Athlon, but it's going to beat Visual C++ 6.0 SP4 with Processor Pack. When you think about it, it makes sense, too. All superscalar processors are suffering mostly from the same effects. -Matt
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