Seen in this light, modern CPU memory hierarchies did not evolve independently. They co-evolved with speculative, out-of-order execution, becoming the physical scaffolding required to sustain it. At its core, speculative execution optimizes for illusion—the illusion that a single sequential thread is progressing faster by guessing ahead.
child: Fiber | null;
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Apple Health3,048Days of steps data
print(u.username); // alice