#5122: Faster conversion between Rational and Double/Float
----------------------------------+-----------------------------------------
Reporter: daniel.is.fischer | Owner:
Type: task | Status: new
Priority: normal | Component: libraries (other)
Version: 7.0.3 | Keywords: fromRational toRational
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
----------------------------------+-----------------------------------------
The proposal for the new implementation of `fromRational` and `toRational`
was discussed (very briefly)
[http://haskell.org/pipermail/libraries/2011-March/016144.html here].
Supported by Simon Peyton Jones and (off list) Jason Dagit. No dissent.
The old implementation of `toRational` and `fromRational` for `Double` and
`Float` was extremely slow. Exploiting the representation of the involved
types allows an order of magnitude speedup. In particular a fast base-2
logarithm is needed, this has to be implemented in the integer-gmp resp.
integer-simple packages, therefore three patches are needed, for base and
each of the integer packages.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5122>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
