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gcc optimizations.

Today I spent trying to compare how fast different algorithms for calculating the van Rossum metric run; I ran sample code compiled using the -O3 flag in gcc. I have never known how these optimization settings work, but today I was profiling the code using gprof and was amazed to see how in-line the code is when optimized, the length of the gprof output is determined in part by how many function calls there are, the output is 163 lines with -O3 and 1042 without.

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