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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