[Info-vax] Assembly languages, was: Re: OT: PDP-11 history in arstechnica

[gah4]

On Friday, March 18, 2022 at 12:22:10 PM UTC-7, Simon Clubley wrote:

(snip)

> Yes, but that doesn't change my point that with every architecture 
> I know (both DEC and non-DEC) that uses a MOV/MOVE mnemonic variant, 
> then MOV/MOVE is actually a copy to destination instead as the source 
> is not destroyed during the copy.

In the case of overlapping operands, the source might get, 
at least partially, destroyed.  

In the days of magnetic core memory, which has a destructive read
cycle, one could have designed processors that did clear the source.