Compilers saved memory by limiting identifiers to 8 characters or fewer.
编译器将标识符限制为8个字符或更少，以此来节约内存。
Many compilers can generate more efficient code for this by putting the tables in read-only memory.
很多编译器通过将表放入只读内存中可以生成更高效的代码。
Some compilers support live-range splitting, where a variable can be allocated to different registers as well as to memory in different parts of the function.
有些编译器支持“生命周期分割”(live - range splitting)，也就是说在程序的不同部分，变量可以被分配到不同的寄存器或者内存中。
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