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  Compile Flags
I do a lot of numeric (double precision floating point) programming, and my experience is that the -O3 -ffast-math compile flag combination consistently yields just about the best result. Be warned that -ffast-math takes some math shortcuts and does not follow all IEEE error-handling conventions, so if you use this flag, you should verify your results, especially if you need very high accuracy. My experience is that it is well worth the speed boost to use this flag. I have seen on the MinGW users mail archive that -Os (optimize for small code size) can also yield the best results in some cases, perhaps because it allows the code to fit better into the CPU's L1 or L2 cache. I also prefer to use the -Wall flag to report all warnings. This is an excellent practice.

 
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This page last modified
Saturday, 19-Nov-2011 09:41:53 MST