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I generate a list of random numbers in an array and then time how long it takes for each of the functions to process the entire array in a loop. The result of each function I add to a running total, and I print the total at the end to make sure it doesn't get optimised away, and also to see how accurate they are. I could also calculate the overhead if I just add the results of the array, but I haven't tried that yet, and I think it might get optimised into SSE ops anyway.