#5419: integer-gmp no longer exports S# and J#
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Reporter: mikhail.vorozhtsov | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: libraries (other) | Version: 7.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by tibbe):
Here's and example use of the internals:
https://github.com/bos/text/blob/master/Data/Text/Lazy/Builder/Int.hs#L95
Note that the `Integer` value being pretty-printed here typically won't be
known statically, so optimizing constants won't help here.
Hashing `Integer`s is another important case. We can hash an `Integer`
much faster if we can first hash the `Int#` component and then zip over
the `ByteArray#`.
We could create a projection function of type `Integer -> (Int#,
ByteArray#)` which would be a simple constructor unwrapping in integer-gmp
and some kind of conversion in integer-simple.
Note that packages can access `S#` directly but still be portable to other
integer implementation by using CPP.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5419#comment:7>
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