[dataflow]: patch committed to improve -O0 performance.

Paolo Bonzini paolo.bonzini@lu.unisi.ch
Wed Mar 28 22:23:00 GMT 2007

Kenneth Zadeck wrote:
> Paolo Bonzini wrote:
>> I'm wondering, many passes that use DF_LIVE could actually use
>> DF_LR.  If they sum up substantially, DF_UR/DF_LIVE could become
>> optional problems.
>> A nit:
> They can, but the information is not as precise. 

I mean, maybe some can without changes in code generation.  Possibly
they look at liveness information only for registers that they know
to have been initialized.


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