[Haskell] inline assembly a la gcc

[Don Stewart]

ppk:
> Is there a way in which I can interface GHC with assembly language ?
> Of course I can create a stub C function which using inline assembly,
> compile it with GCC, and crankin the FFI of GHC. But is there a more
> direct way ?
> 
> I would like to try coding, (or steal from some open source
> implementation) up some crypto hash functions in assembly and compare
> it with a direct GHC implementation.
> 
> I will be happy if there is a way of avoiding assembly all together
> and work with GHC internals like Int# etc. which gives me almost
> assembly speed.

Via the harpy or llvm packages?