Me: OK, I optimized the hell out of this function using SIMD intrinsics and it should now be a lot faster than it was. Yay!
Computer: Great work, you beautiful genius! What a shame it is that you didn't actually profile the code before optimizing it, so you didn't notice the code is not CPU bound but memory bound. Your "optimized" code will give you a perf increase of approximately 0%
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