Binary IEEE floating point format for AMQP
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? Paul.
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
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Stefan O'Rear