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About this function __movsb :

link : https://msdn.microsoft.com/en-us/library/hhta9830.aspx

I wish to know which technologies it is belong to (Such as SSE , AVX)

link : https://software.intel.com/sites/landingpage/IntrinsicsGuide/

I couldn't find it (__movsb) from the website , anyone know ?

Anson Tan
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    Goes all the way back to the original 8086. Don't use it, memcpy/memmove can do a better job. – Hans Passant Aug 25 '16 at 07:24
  • memcpy is slower than it, I need a faster speed. – Anson Tan Aug 25 '16 at 07:34
  • extra-fast `rep movsb` is a new feature with IvyBridge. Before that, it was better to use `rep movsq`. [The enhances movsb / stosb feature is called ERMSB](http://stackoverflow.com/questions/26246040/whats-missing-sub-optimal-in-this-memcpy-implementation) – Peter Cordes Aug 25 '16 at 08:19

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