In preparing the speed ups in uuid-0.1.2, I investigated various ways to store
16 bytes of data in a Haskell object. Surprisingly, storing as 4 Word32 values
in a standard data type worked best for that application.
I've extracted out the testing work for that and put it here:
On Tue, Jan 05, 2010 at 04:06:09PM -0800, Mark Lentczner wrote:
In preparing the speed ups in uuid-0.1.2, I investigated
various ways to store 16 bytes of data in a Haskell object.
Surprisingly, storing as 4 Word32 values in a standard data
type worked best for that application.
However, on
2010/1/5 Mark Lentczner ma...@glyphic.com
There you can find the code that tests storing 16 bytes in various ways:
data InWords = WO !Word32 !Word32 !Word32 !Word32
deriving (Eq, Ord)
data InList = LI [Word8] deriving (Eq, Ord)
data InByteString = BS
On Tue, Jan 05, 2010 at 04:40:55PM -0800, Bryan O'Sullivan wrote:
You've got an extra level of indirection there due to the use of data
instead of newtype, so you're paying an additional boxing penalty for
everything except your first case. Are you compiling with
-funbox-strict-fields?
I've
