问题
While I was looking for MMX functions, I noticed that two of them, _m_empty and _mm_empty, have exactly the same definition.
So why do they both exist ? Is one of them older than the other ? Is there a difference that is not mentioned in the manual ?
回答1:
Differences would/should be pointed out in the documentation. The MSDN is more precise. They explicitly mention this:
A synonym for _mm_empty is _m_empty.
来源：https://stackoverflow.com/questions/32413644/what-is-the-difference-between-m-empty-and-mm-empty