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by atq2119
1556 days ago
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> CPUs do OOO because they don’t trust compilers to get the order of instructions right. Not really. CPUs do out-of-order because cache hits are unpredictable and it is crucial for single-threaded performance to make progress on dependent operations as soon as a loaded value is available. There may be other, lower order, factors, but variable memory latency is the real reason. |
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