|Maximum Register Pressure? email@example.com (2006-03-12)|
|Re: Maximum Register Pressure? Sid-pasdespam.Touatifirstname.lastname@example.org (Sid Touati) (2006-03-14)|
|Re: Maximum Register Pressure? Sid.Touati@inria-nospam.fr (Sid Touati) (2006-03-14)|
|From:||Sid Touati <Sid-pasdespam.Touatiemail@example.com>|
|Date:||14 Mar 2006 00:50:18 -0500|
firstname.lastname@example.org a écrit :
> I have a question. Does an optimal schedule of a basic block also
> gives maximum register pressure for that basic block?
here is a DAG represented with data dependences :
a -> b : flow arc latency = 20
c -> d : flow arc latency = 1
e -> f : flow arc latency = 1
A time-optimal schedule is of latency 20 (assuming enough resources).
Assuming no exit values, ie. the operations b d f do not write into
registers, you can use only two registers in a time-optimal schedule
(schedule the whains a->d and e-> in serial), while the maximal register
pressure is 3 registers (a c e simultaneously alive)
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