Should I add a ticket?
Sounds good - and if you could attach a small example showing how Array
is faster that would be helpful too.
Ok, ticket is http://hackage.haskell.org/trac/ghc/ticket/2727 .
Hope I got the example right - the effect is clear, but with "functional"
DiffArray, it is way too easy to lose single-threadedness.
In addition to the basic slowness issue, it appears there has been a
serious regression in the area (handling of $! perhaps?) since 6.4.1.
Claus
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