rtl understanding till what level?

[rashmi kankaria]

hi,
if one is given a task of writing a front end of gcc like the existing frontend for cpp(typically till creation of ast with managing other things ofcourse ..) then how much knowledge of rtl is required? does gcc documentation provides that much help or else needs to go thru the source files to really understand the rtl exprs..?

thanking you,
rashmi
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