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I’ve heard these “simple heuristics” are multi-megabyte neural networks these days. I believe I heard that claim in this video: https://youtu.be/ymcOLL2qEg8 htt

• pas 7y ago
  Usually branch prediction is what ANNs are used for in CPUs. Caches usually operate as complicated pseudo-LRUs. https://stackoverflow.com/questions/22597324/what-cache-invalidation-algorithms-are-used-in-actual-cpu-caches https://stackoverflow.com/questions/22597324/what-cache-inva... It's possible that Tesla does something different that makes sense in their specific situation, but general purpose CPUs - as far as I know - don't use NNs for this.
  • Sesse__ 7y ago
    Ryzen and some ARMs use perceptrons for branch prediction. It's essentially a single-layer neural network with no nonlinearity at the end. Multi-megabyte NNs for a normal branch predictor would be impossible; way too high latency to be useful.
    • 0-_-0 7y ago
      > It's essentially a single-layer neural network with no nonlinearity at the end. That's just a fancy way of saying matrix multiplication :)
      • Koshkin 7y ago
        No, matrix multiplication is just an implementation detail.