fast bcopy...

[rozhuk.im at gmail.com]

> > guess this is a good time to thank the FreeBSD hackers for that FPU
> > stack FILD/FISTP idea!
> > I'll append the copy related notes of our doc/memperf.txt.
> > Thanks,
> 
> I made an implementation of fpu unwinding and mmx copy to see if they
> were really making a difference years ago (reimplementing bcopy,
> memcopy, etc.).

Codecs, such as Ffdshow often contain their own functions to work with memory.