[Mono-list] cpblk?

[Serge]

> presumably memmove(3) does this, right?

Yes, sure.
But what I mean is:
 a) inlining the code when size=const, in some cases avoiding use of counter reg.
    Say, if size=8 that would be two movsd instructions (no need to load ECX);
    (Same for small sizes - no need to use EDI/ESI).
 b) avoiding compare & conditional branch that is always present in memmove (and is slow);

Anyhow, introducing incompatibility seems unjustified in this case.
(I mean some code will work on Mono, but not on .NET).

Sergey