What is the difference between _m_empty and _mm_empty?

Question

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 ?

Generally speaking, you should avoid using MMX. It's deprecated for x64 native development along with AMD 3DNow! and x87. SSE/SSE2 should provide everything you need and more, and is portable between x86 and x64 native. — Chuck Walbourn, Sep 06 '15 at 20:11
@ChuckWalbourn Thanks for the tip. I'm only using SSE for now, but I didn't now about MMX. — Aracthor, Sep 07 '15 at 02:58

score 3 · Accepted Answer · edited Sep 05 '15 at 15:05

3

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.

edited Sep 05 '15 at 15:05

Aracthor

answered Sep 05 '15 at 14:15

HelloWorld

1 Answers1