stack pointer

基本解釋

So in this instruction, $sp is the stack pointer (it's an alias for $1).
所以在這個(gè)指令中，$sp 是堆棧指針（它是 $1 的別名）。
The stack is coordinated with a stack pointer that keeps track of storage and retrieval of each byte or word of information in the stack.
棧和一個(gè)棧指針配合工作，棧指針隨時(shí)指示要存取的每個(gè)字或字節(jié)信息在棧中的位置。
This simple design, possible because the data obeys strict LIFO order, means that no complex data structure is needed to track stack contents - a simple pointer to the top of the stack will do.
這種簡(jiǎn)單的設(shè)計(jì)，很有可能是考慮到數(shù)據(jù)操作都符合后進(jìn)先出（LIFO ）規(guī)則，這意味著訪問(wèn)棧的內(nèi)容并不需要復(fù)雜的數(shù)據(jù)結(jié)構(gòu)，一個(gè)簡(jiǎn)單的棧頂指針就能搞定一切。