[Sorry, sent from the wrong account at first.]
We currently don’t have the resources to work on DPH. I would obviously prefer
to leave the code in, in the hope that we will be able to return to it.
Manuel
> Richard Eisenberg <e...@cis.upenn.edu>:
>
> Hi devs,
>
> There's a sizable number of modules in the `vectorise` subdirectory of GHC.
> I'm sure these do all sorts of wonderful things. But what, exactly? And, does
> anyone make use of these wonderful things?
>
> A quick poking through the code shows a tiny link between the vectorise code
> and the rest of GHC -- the function `vectorise` exported from the module
> `Vectorise`, which is named in exactly one place from SimplCore. From what I
> can tell, the function will be called only when `-fvectorise` is specified,
> and then it seems to interact with a {-# VECTORISE #-} pragma. However, `{-#
> VECTORISE #-}` doesn't appear in the manual at all, and `-fvectorise` is
> given only a cursory explanation. It seems these work with DPH... which has
> been disabled, no? Searching online finds several hits, but nothing more
> recent than 2012.
>
> I hope this question doesn't offend -- it seems that vectorisation probably
> has amazing performance gains. Yet, the feature also seems unloved. In the
> meantime, compiling (and recompiling, and recompiling...) the modules takes
> time, as does going through them to propagate changes from elsewhere. If this
> feature is truly orphaned, unloved, and unused at the moment, is it
> reasonable to consider putting it on furlough?
>
> Thanks,
> Richard
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