Intel's 1986 ICCD paper Performance Optimizations of the 80386 reveals how tightly this was optimized. The entire address translation pipeline -- effective address calculation, segment relocation, and TLB lookup -- completes in 1.5 clock cycles:
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There are about 33 distinct test constants, covering every protection scenario on the 386. Each activates a different subset of the 148 product terms, encoding the specific privilege rules for that scenario. To give a feel for what the PLA does concretely, here are the possible outcomes for two tests:
const cur = arr[i]; // 当前遍历的元素值