I want to accept this. But, in the end, I don't see enough benefit (which seems to be mostly aesthetic) to justify the (somewhat modest, as these things go) costs.

I sadly agree with the shepherd to reject.

Richard

On Mar 8, 2021, at 11:59 AM, Joachim Breitner <mail@joachim-breitner.de> wrote:

Hi,

your points sounds reasonable, and the author got a heads up on the
Github thread (so unlikely that there was a misunderstanding or
oversight), so I’ll concur with the shepherd.

Cheers,
Joachim


Am Montag, den 08.03.2021, 15:51 +0000 schrieb Simon Marlow:

Committee,

Proposal #367 suggests using unboxed sums for the results of 7 (seven) primops that use sum types but currently have to encode those explicitly using `Int#`.

https://github.com/treeowl/ghc-proposals/blob/unboxed-sum-primops/proposals/0000-unboxed-sum-primops.md

The proposal is arguably the right thing, however I'm suggesting we reject it for the following reasons:
The implementations of the primops would bake in the translation of unboxed sums. Right now our unboxed sum translation is defined in one place - CorePrep - but this proposal would leak it into the implementations of a few primops.
Migration would entail adding a backwards-compatibility layer, with the associated complexity and risk of performance regressions.
While the current situation is perhaps inelegant, it's not broken and it's easy to understand.
Thoughts?

Simon


On Sun, 4 Oct 2020 at 22:14, Joachim Breitner <mail@joachim-breitner.de> wrote:

Dear Committee,

this is your secretary speaking:

Clarify primops using unboxed sum
has been proposed by David Feuer
https://github.com/ghc-proposals/ghc-proposals/pull/367
https://github.com/treeowl/ghc-proposals/blob/unboxed-sum-primops/proposals/0000-unboxed-sum-primops.md

I’ll propose Simon Marlow as the shepherd.

Please guide us to a conclusion as outlined in 
https://github.com/ghc-proposals/ghc-proposals#committee-process

Thanks,
Joachim
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-- 
Joachim Breitner
 mail@joachim-breitner.de
 http://www.joachim-breitner.de/


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