If you look at all of the JS glue code for the single call to console.log above, you’ll see that there is a lot of overhead. Engines have spent a lot of time optimizing this, and more work is underway. Yet this problem still exists. It doesn’t affect every workload, but it’s something every WebAssembly user needs to be careful about.
Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
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▲提示词：一张繁忙亚洲城市雨夜的电影感街头照片。一个巨大的、发光的红色霓虹灯牌挂在一座老建筑上，上面清晰地写着「重庆老火锅」。在它下面，一个较小的蓝色霓虹灯牌写着「24 小时营业 – 欢迎光临」。湿漉漉的柏油路反射着霓虹灯光。