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It's been on my mind a lot lately when thinking of where to _not_ spend optimization energy in new languages. I think the perspective of staging / specializing is helpful. Like consider your compiler as deciding not just "abstractions to look through" but values to specialize-on.
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It's tempting to think that a compiler is only looking-through abstractions; but in many cases it's also baking-in (possibly to a partial replica) assumptions made when looking-through, and those carry costs both for the replicas and for handling cases when assumptions are wrong.
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(Absurd limit case: specializing programs on every possible input. But less absurd: every one of N scalars used as array sizes? Every one of X*Y caller/callee combinations?)
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Dude, your enthusiasm for PLT stuff is no small part of what’s been keeping my gears turning lately, pretty sure we all welcome a little excitement (and a little nudging to actually do the thing, hah)
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Thanks, that means a lot actually. It’s what I try to do at least. It feels like a bunch of this stuff is on the cusp of combining together into something really cool, and I want to see it happen!
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