vectorisation code?

[Jan Stolarek]

I share Richard's opinion.

Janek

Dnia wtorek, 13 stycznia 2015, Richard Eisenberg napisał:
> 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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