12 Dec
2005
12 Dec
'05
12:03 a.m.
Fred Cisin wrote:
Both are the same speed and size, and quick timing shows that they are now the
same speed as the XLAT method. (I assume that's what you were asking)
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
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If DAA were
slow, I'd say ditch it. But DAA is only 4 cycles and according to
my real-world 8088 timings (slow night tonight), the DAA approach is only just
a hair slower than the XLAT method.
So I guess there *is* a need for DAA ;-)
Howzbout:
AND AL, 0Fh
DAA
ADD AL, 0F0h
ADC AL, 40h
or:
AND AL, 0Fh
ADD AL, 0
ADC AL,28h
DAA