The segmentation unit performs two operations simultaneously: adding the segment base to produce the linear address and comparing the effective address against the segment limit. Both use dedicated 32-bit adder/subtractor circuits.
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
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