prefix value

All system value semantics begin with the SV _ prefix.

所有系统值语义使用SV_开头.

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The count value is put into% ecx as it is needed by rep prefix.

因为rep前缀需要count值，所以将它放入%ecx中。

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If you choose to pass a variable by reference, prefix it with&, and put it inside the []; for variable passing by value, prefix it with the equal sign (=).

如果选择通过引用传递变量，就在它前面加上&并把它放在[]内；对于通过值传递的变量，在它前面加上等号（=）。

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