Specialising NOINLINE functions
Simon Peyton Jones
simon.peytonjones at gmail.com
Fri May 6 09:04:11 UTC 2022
At the moment the INLINEABLE pragma means "capture my right-hand side,
regardless of how big it is, so that it can be type-class-specialised,
including in other modules". But it *also *says "feel free to inline me".
Some users (eg Gergo) want to say NOINLINE on some functions. But for these
they'd still like to generate type-class-specialised versions. After all,
if we aren't going to inline them, specialising is the next best thing.
But we have no way to say both "specialise me" and "don't inline me",
because you can't say both INLINEABLE and NOINLINE. (That would look
I think we should probably just bite the bullet and add a SPECIALISABLE
pragma, *orthogonal to INLINE/NOINLNE*, which say "capture my right-hand
side, regardless of how big it is, so that it can be
type-class-specialised, including in other modules". It behaves exactly
like INLINEABLE except that you can specify it along with INLINE/NOINLINE.
Any thoughts? Do you think this needs a GHC proposal?
See #21036 <https://gitlab.haskell.org/ghc/ghc/-/issues/21036#note_407930>
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