Wasn't it already shown that ghc already swaps the order of branches to
match?
On Thu, Oct 21, 2021 at 11:13 AM 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@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@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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