Em 12/3/2011 13:46, Michael Watterson escreveu:
> On 12/03/2011 16:11, Olin Lathrop wrote:
>> Again not true.  Adds (subtracts are really adds with a little extra
>> bookkeeping) require normalization before the addition, which explicitly
>> means the point has to be moved around.
> it's quite possible do fixed point library  with only adjustment on=20
> mult/div, and add/subtract doesn't care where the point is.


As long as the points are at the same position for both parcels.
For multiplication, the points can be at different positions before the
multiplication, and you only need a shift afterwards to put the point
where you want it.
For addition, you must ensure that both points are at the same position
before the operation, using a shift.

Isaac

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