Author: Dann Corbit
Date: 18:44:49 01/04/02
Go up one level in this thread
On January 04, 2002 at 21:26:40, Aaron Gordon wrote: >Pretty much to get the best speed increase you need to do profiling. Install >MSVC with the IntelC 5 compiler... use these switch's.. > >"/G6 -O3 -Qipo -Qunroll -QxiK -Qprof_genx -Qprof_dir c:\opt" > >Compile, run your program.. after it generates the profiling information >recompile w/ that same string except replace -Qprof_genx with -Qprof_use > >You'll need to tinker with various settings, sometimes -QxK is faster, sometimes >-QxiM, etc.. it's all in the documentation.. I'm fond of QaxW for the Intel compiler, because it will still run on non Athlon machines, and gets a dandy boost on the Athlon chip. I don't think he has a copy of the Intel compiler. -Qunroll is the default. -Qwp_ipo is nice sometimes. Experimentation can bring a few percent here and there. Beware of Qpc32 -- I have seen real problems generated from this on chess engines. This is what I have been using lately as a starting set: /Gr /Zp16 /ML /W4 /Gi /Ob2 /YX /FD /O3 /QaxW /Qwp_ipo /Qipo_S /G7 /Gs /Qip /GA /GF /c
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