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by bodyfour
1204 days ago
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That's a good instinct to have. However in this case the input is 0..63 and the output comfortably sits in a single byte. It can fit in just one cache line if you bother to align it. The miss cost is, therefore, not really relevant: if this code is hotpath at all the cost of a single cache miss is amortized across millions of calls. Your lookup table will be in cache as surely as the code that reads it is. |
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