So one thing I’d like to highlight, that I don’t know if we could bake into ghc safely and might not be relevant here is:

At least in some cases, implementations of EQ may use “reallyUnsafePtrEquality#”, as a never false positive check that two heap values are the same heap object. Naively this seems like it’s probably orthogonal to the matter of Eq being a single or double method type class, but I figure it’s worth asking out loud 

On Wed, Oct 20, 2021 at 4:29 PM Joachim Breitner <mail@joachim-breitner.de> wrote:
Hi,

parallel work… should have linked to
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/6793
earlier. But yes, it is rather simple to make that change.

Am Mittwoch, dem 20.10.2021 um 19:49 +0300 schrieb Oleg Grenrus:
> I attach the patches for ghc, containers and text.
> I encourage someone (Joachim?) to run the nofib suite.

nofib might be too specialized; I think “ghc compiling Cabal” is a good
benchmark. I’ll do that eventually, if GHC’s CI doesn’t do that already
for me (I’ll ask Ben what kind of infrastructure we have for that –
doing it manually and correctly is tedious and error-prone), maybe
tomorrow.

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


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