Hi Niklas,
Sorry for slow reply - I'm totally snowed under at the moment.
I should be able to give some overview/examples of what are primops and how
they go through the compilation pipeline. And talk a bit about the
Cmm-level parts of GHC. But I won't have much time to prepare, so there
might be fair amount of improvisation...
Are you coming to this week's HaskellerZ meetup? We could chat a bit more
about this.
Cheers!
- Michal
On Tue, May 22, 2018 at 12:07 PM Niklas Hambüchen
I'd be happy to help. :) I know a bit about the backend (e.g., cmm level), but it might be tricky to find there some smaller/self-contained
On 08/04/2018 15.01, Michal Terepeta wrote: projects that would fit ZuriHac.
Hey Michal,
that's great. Is there a topic you would like to give a talk about, or a pet peeve task that you'd like to tick off with the help of new potential contributors in a hacking session?
Other topics that might be nice and that you might know about are "How do I add a new primop to GHC", handling all the way from the call on the Haskell side to emitting the code, or (if I remember that correctly) checking out that issue that GHC doesn't do certain optimisations yet (such as emitting less-than-full-word instructions e.g. for adding two Word8s, or lack of some strength reductions as in [1]).
You've mentioned performance regression tests - maybe we could also work on improving nofib?
For sure! Shall we run a hacking session together where we let attendees work on both performance regression tests and nofib? It seems these two fit well together.
Niklas
[1]: https://stackoverflow.com/questions/23315001/maximizing-haskell-loop-perform...