In a recent note, Greg Smith said:
> Date: Wed, 6 Jul 2005 12:26:01 -0400
>
> ds 0d
> a ds 12x
> b ds 16x
> But if I code
>
> mvc b(16),a
>
> the overlap is destructive (ie b won't necessarily be an exact copy of
> a). Would a
> concurrent copy occur? (in this case, a concurrent copy could occur
> without affecting
> the result).
>
No. I believe the "destructive" character of the overlap has long
been part of the specification of MVC. In particular, programmers
of old were accustomed to blanking out a buffer with:
MVI C' ',A
MVC A+1(L'A'-1),A
(before padding MVCL).
-- gil
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