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缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）
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但是，奧爾代也指出，由於關稅普遍適用，有一件事是確定的：外國產品在美國的價格普遍會更高。。关于这个话题，夫子提供了深入分析
As an aside: the early 386's POPAD instruction has a famous bug. EAX is written in the RNI (run-next-instruction) delay slot via an indirect register file access -- the only instruction that does this. When the next instruction uses a base+index addressing mode, the register file write from POPAD collides with the EA calculation's register file read, corrupting the address. A fitting example of how complex optimizations can lead to problems.，更多细节参见服务器推荐
union object_info *h = free_list[classno];