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Is it better if u use add allways with carry?


Thu, 25 Jul 2002 03:00:00 GMT  
 carry
On Sun, 06 Feb 2000 16:33:38 GMT, "henrik ij?s"

Quote:
> Is it better if u use add allways with carry?

Probably not, but it really depends on what you are trying to do, and
the processor you are trying to do it on.

If you have a large number and you have to add it in pieces, one byte
or word at a time, when you start with the lowest byte or word you
have to do one of two things, either add without carry, or first
execute an extra instruction to clear the carry and then you can add
with carry.

The 6502 microprocessor used in the original Apple II computer only
had one add instruction, add with carry.  So you always had to put an
instruction to clear the carry before the addition of two byte values,
or of the first bytes of a multibyte addition.

Jack Klein
--
Home: http://jackklein.home.att.net



Thu, 25 Jul 2002 03:00:00 GMT  
 
 [ 2 post ] 

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