Thomas M. DuBuisson wrote:
Comments on the zipWith' function inside of Data.ByteString say:
-- Rewrite rules
-- are used to automatically covert zipWith into zipWith' when a pack is
-- performed on the result of zipWith.
This is only true internally to Data.ByteString because the zipWith'
function could be inlined away by GHC once that module is compiled,
right? If I want "pack (zipWith xor bs1 bs2)" to be efficient then I'll
have to either get zipWith' exported or write my own lower level
zipWith'?
As far as I know GHC prefers RULES to INLINE, but it's fragile.
You may check with -ddump-simpl-stat.
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