Re: [Haskell-cafe] Re: MD5 performance optimizations, and GHC -via-C producing segfaulting binary

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