“asm"、“__asm"和“__asm__"有什么区别? [英] What is the difference between 'asm', '__asm' and '__asm__'?

问题描述

据我所知，__asm { ... }; 和 __asm__("..."); 之间的唯一区别是第一个使用mov eax, var 第二个使用 movl %0, %%eax 和 :"=r" (var) 最后.还有哪些不同之处?仅 asm 怎么样?

As far as I can tell, the only difference between __asm { ... }; and __asm__("..."); is that the first uses mov eax, var and the second uses movl %0, %%eax with :"=r" (var) at the end. What other differences are there? And what about just asm?

推荐答案

你使用哪一个取决于你的编译器.这不像 C 语言那样标准.

Which one you use depends on your compiler. This isn't standard like the C language.

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