[LLVMdev] difference between pattern and dag2dag isels

[Alkis Evlogimenos]

What's the difference between the pattern and the dag2dag instruction 
selectors?
 It seems that the pattern selector does not preserve the original dag but 
the dag2dag one does. Is this done so that scheduling/other opts can be 
performed more easily in the generated machine code?
 Thanks,

-- 

Alkis
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