Dilemma: DiffArray non-performance vs STArray non-readability

Claus Reinke claus.reinke at talk21.com
Mon Oct 27 20:45:37 EDT 2008

>> 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.


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