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From the thread How fast can we compute the dot product inside the Programming Forum, I've learned about the power of the SSE instructions. PB supports that new features. Is there a rule of thumb when to use such instructions?
Just keep in mind that the first "S" in SSE is "Streaming". All the SSE instructions are specifically designed to work on large blocks of continuous data so you would never consider them for just processing 1 or 2 items of data.
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