>
> data PackedString = PS !(ForeignPtr Word8) !Int !Int
A ForeignPtr is a sum type, so it can't be unboxed unfortunately. This
is undoubtedly one cause of inefficiency in the code.
Depending on how you're using ForeignPtrs, you could possibly define a
specialiased kind of ForeignPtr that would be unboxable. This would
require using low-level non-portable stuff though. Are you using
mallocForeignPtr? Or adding extra finalizers to ForeignPtrs?
Cheers,
Simon
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