ychen added a comment. IIUC, this is the NPM version of EP_EarlyAsPossible in legacy PM for O0, right? Between the choice of (1) [this patch and ] reusing all existing EP callbacks and letting optnone filtering out non-required passes (which I think does not work for `-disable-O0-optnone`) and (2) a separate EP callback, say, O0EPCallbacks, I would vote for the latter since it is more explicit and does exactly what we expect it to do. The cost is that we also need to add passes to O0EPCallbacks separately which I think is justified since required passes should be rare.
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