Don Stewart wrote:
I'm confused. GHC of course unboxes strict fields of primitive data types.
{-# OPTIONS -O2 -fvia-C -optc-O2 -funbox-strict-fields #-}
... but only when you give -funbox-strict-fields, as there, or UNPACK.
The point is that it never loses sharing to unbox a strict Int field
[1], so it should do that with -O, even without either of the above
overrides.
[1] I'm not sure if this is true... if it has to rebox the Int, you get
another copy floating around, not the original, right?
-Isaac
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