[Haskell-cafe] 80 bit floating point data in Haskell?

Antoine Latter aslatter at gmail.com
Mon Sep 28 08:04:34 EDT 2009

On Mon, Sep 28, 2009 at 5:52 AM, Andrew Coppin
<andrewcoppin at btinternet.com> wrote:
> wren ng thornton wrote:
>> Andrew Coppin wrote:
>>> While we're on the subject... I understand that certain FPUs support
>>> 80-bit precision. Is there any way to get at that? Or is this going to
>>> require FFI too?
>> Perhaps you want Foreign.C.Types.CLDouble ?
>> http://hackage.haskell.org/packages/archive/base/latest/doc/html/Foreign-C-Types.html#t%3ACLDouble
>> http://en.wikipedia.org/wiki/Long_double
>> (Or do you really want to ensure that it's 80-bits regardless of platform
>> and the whims of the C compiler?)
> Yep, that'll do. :-)

>From the source:

-- HACK: Currently no long double in the FFI, so we simply re-use double
-- | Haskell type representing the C @long double@ type.

I also believe that CLDouble is gone in GHC 6.12.1, since it isn't really there.


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