🚀 go-pugleaf

Edward E. Jaffe wrote in message <433D6157.7090209@phoenixsoftware.com>...
>Don Nielsen wrote:
>>Nothing like a dumb applications programmer question to end the week.
>>Is there an instruction like MVCL that moves memory starting at the end
>> working to the beginning.  I have a table that is in sequence.  I want to
>>insert a new row, maintaining sequence.  That requires shifting right the
>>end of the table.  It would be great to just code an MVCL to do it,
>>but I would be overwrite data.  But if MVCL started with the last byte and
>>worked its way to the start, then the shift would be easy.  Does any
>>such instruction or function exist?

>Shifting a block of data left is easy. Shifting right must be done
>one-byte-at-a-time in a loop.

Would give the simplest code but would be slowest,
considering the setup time for each of the individual instructions.
Better to use a small buffer, start at the end, and move
chunks at a time.

>>I guess I could do something silly and build the table starting
>> at the end of the of memory block and shift it left as I build it.

>That's precisely what I have done in similar circumstances.

Lateral thinking!

>--
>.-----------------------------------------------------------------.
>| Edward E. Jaffe