On Mon, Jun 18, 2012 at 4:09 PM, Roman Leshchinskiy <r...@cse.unsw.edu.au>
wrote:
> ForeignPtrs can be unpacked, just not manually (which is a GHC bug, IMO, I
> should report it):
>
> data Vector a = Vector {-# UNPACK #-} !Int
> {-# UNPACK #-} !(ForeignPtr a)
>
> ByteString just has some room for optimisation here ;-)
I probably just remembered the ByteString optimization incorrectly. My
apologies. I think the Addr# field was moved to the top of ForeignPtr
(not to the PS constructor itself) to support unpacking.
-- Johan
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