[Haskell-cafe] ANN: hmpfr-0.3.2 (requires integer-simple, supports mpfr 3.0.0)

Edward Kmett ekmett at gmail.com
Fri Mar 4 22:06:45 CET 2011

I'd be more than willing to tackle flipping things over to use foreign
prims, so that I have something I can build on top without requiring the
contortions to get a ghc build with integer-simple.

Dan has a cabal buildable library with foreign prims to use as a model.

Is the google code repository up to date?

-Edward Kmett

On Fri, Mar 4, 2011 at 3:27 PM, Daniel Peebles <pumpkingod at gmail.com> wrote:

> According to Duncan Coutts (whom I asked about this issue in #ghc), the
> solution here is to use the new foreign import prim machinery to talk to
> MPFR. This prevents GC from occurring during the MPFR calls and will make
> everything work nicely without reimplementing GMP.
> Dan
> On Fri, Mar 4, 2011 at 3:09 PM, Daniel Peebles <pumpkingod at gmail.com>wrote:
>> Have you submitted a bug report to GHC of why it can't work with the
>> current integer-gmp binding? I know that GHC's collector is collecting
>> MPFR's temporary data, but maybe it'd be good to get a discussion going on
>> what can be done to stop it from doing this even in the context of the
>> existing integer-gmp + GHC's allocator (even if this needs to be a patch to
>> MPFR to talk to GHC a bit here and there). Might it help to go through CMM
>> like the GMP binding does, for example?
>> I'd really like to see libraries that use GMP work nicely with GHC,
>> without going and reimplementing GMP more slowly and so on.
>> Dan
>> 2011/3/3 Michal Konečný <mik at konecny.aow.cz>
>>> Dear all,
>>> I am pleased to announce hmpfr-0.3.2, a new version of Aleš Bizjak's
>>> bindings
>>> to the MPFR arbitrary precision floating point arithmetic library.  The
>>> changes in this version are quite small but significant:
>>> - support for MPFR 3.0.0 as well as MPFR 2.4.*
>>> - dependency on integer-simple instead of integer-gmp
>>> The latter is most significant because unfortunately it makes it rather
>>> more
>>> difficult to install hmpfr.   Currently almost all binary distributions
>>> of ghc
>>> have integer-gmp compiled in to provide the Integer type via the standard
>>> GMP
>>> library.  Also haskell platform 2010.2.0.0 assumes that ghc has been
>>> compiled
>>> with integer-gmp although it makes no specific use of it.  Instructions
>>> on how
>>> to compile ghc and haskell platform with integer-simple instead of
>>> integer-gmp
>>> are on:
>>> http://code.google.com/p/hmpfr/wiki/GHCWithoutGMP
>>> The rationale for this change is the fact that despite much effort hmpfr
>>> is
>>> very unreliable on ghc that includes integer-gmp due to ghc deallocating
>>> GMP
>>> data that was allocated by MPFR at unpredictable times.
>>> Aleš and I hope that hmpfr can return to using integer-gmp once the
>>> proposal
>>> http://hackage.haskell.org/trac/ghc/wiki/ReplacingGMPNotes#BinaryDropinReplacementforGMP
>>> to replace gmp with a modified gmp in ghc is implemented and made the
>>> default.
>>> Best regards,
>>> Michal
>>> --
>>> |o| Michal Konecny <mikkonecny at gmail.com>
>>> |o|    http://www-users.aston.ac.uk/~konecnym/
>>> |o|    office: (+42) (0)121 204 3462
>>> |o| PGP key http://www-users.aston.ac.uk/~konecnym/ki.aston
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