为了实现这种映射，您可以在访问寄存器的位置包括条件编译#指令。
To achieve this mapping, you may include conditional compilation #ifdef in places where you access the registers.
例如，如果一个条件标上了“likely”，那么编译器可以把代码的True部分直接放在分支指令后面(这样就不需要执行分支指令)。
For example, if the conditional is marked "likely" then the compiler can place the True portion of the code immediately following the branch (which will not be taken).
指令添加到输出中，位于每个包含文件的开头和结尾以及被条件编译预处理器指令移除的行的周围。
Directives to the output, at the beginning and end of each included file and around lines removed by preprocessor directives for conditional compilation.
指令添加到输出中，位于每个包含文件的开头和结尾以及被条件编译预处理器指令移除的行的周围。
Directives to the output, at the beginning and end of each included file and around lines removed by preprocessor directives for conditional compilation.
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