Make Eq type class single method

[David Feuer]

Not relevant. One question i have though: in the case of primitive types,
can switching from a primitive `/=` to one based on `==` change the order
of branches and thereby affect performance for better or worse?

On Thu, Oct 21, 2021, 10:19 AM Carter Schonwald <carter.schonwald at gmail.com>
wrote:

> 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 at 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 at joachim-breitner.de
>>   http://www.joachim-breitner.de/
>>
>>
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