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这个编译指令抑制入口代码的产生,有益于内嵌汇编函数。
This pragma suppresses the generation of entry code and is useful for inline assembler functions.
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.
编译器极有可能把上述赋值语句编译成一条机器指令。
The compiler will after all very likely compile the above assignment into a single machine instruction.
It's a little more involved on a PC but it's all free, the software you can download, and Linux in similar operating systems generally come with a compiler or you run a simple command to get it.
在PC机上有点复杂,但是它是免费的,你一般下载的软件,类似Linux的操作系统等等通常都需要,一个编译器,或者你可以运行一些简单的指令来获取。
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