Re: [Haskell-cafe] Binary IEEE floating point format for AMQP

24 Feb 2008


      On Sun, Feb 24, 2008 at 12:21:00PM +0000, Paul Johnson wrote:
...
I'm working on an implementation of the framing layer for AMQP 
(www.amqp.org).  I almost had 0.9 finished when I found they had released 
the spec for 0.10, so I have to redo quite a lot of work.
Amongst the new features of 0.10 are wire formats for floating point.  
These are the 4 and 8 byte IEEE formats.
* Is there a principled way of converting a Haskell Float or Double (or 
Rational, for that matter) to and from IEEE format?
* Since many computers use IEEE format natively, is there a quicker way of 
doing this on those architectures?
{-# LANGUAGE MagicHash #-}
import Data.Int
import GHC.Exts

foo :: Double -> Int64 --ghc only
foo (D# x) = I64# (unsafeCoerce# x)

Stefan

Re: [Haskell-cafe] Binary IEEE floating point format for AMQP

Stefan O'Rear