RFA: Some fixes in dfa ppc8450 description
Wed Apr 2 16:00:00 GMT 2003
>>>>> Vladimir Makarov writes:
Vlad> The most of ppc processors are smart enough and does not require (the
Vlad> first cycle) look ahead. But this is not case for 8450 (as I understand
Vlad> it from the documentation).
Vlad> Generally speaking, the look ahead has advantages and disadvantages.
For Power4, one wants to maximize dispatch groups -- pulling less
high priority instructions forward if it will fill unused slots in a
dispatch group, improving function unit utilization and minimizing
resource reservations. I would expect that lookahead would accomplish
that, but, as I mentioned, enabling it resulted in a degradation in
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