通过减少循环中计算机需要执行的指令，节省了执行时间。

This saves time by reducing the number of overhead instructions that the computer has to execute in a loop.

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使用带有repeat前缀的字符串指令将该函数优化成一个非常紧密的循环。

This function is optimized as a very tight loop using string instructions with the repeat prefix.

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由于Quantify为每个指令都测量机器循环的数量，所以当应用程序运行在远程机器上的gdb之下时，也能生成有用的数据。

Since Quantify measures the number of machine cycles for each instruction, it generates useful data even when run under GDB on a remote machine.

youdao

And I want to remind you, that block of code is a set of instructions, the same set of instructions that are going to be done each time through the loop.

我想提醒大家,这块代码是一个指令集,一个每次循环都会被执行的相同指令集,会变化的仅仅是变量的值。

麻省理工公开课 - 计算机科学及编程导论课程节选

And when I'm done with the whole thing, before I end the increment of the variable, you know, when I'm done, I'm just not returning anything out.

在循环外面初始化它，然后做一个终结测试，然后在循环内部有一个指令集，在这个例子中，就是对余数做检查，然后显示信息，当我完成了整个循环。

麻省理工公开课 - 计算机科学及编程导论课程节选