On Sun, 2009-05-24 at 12:48 -0400, Mario Blažević wrote: > > How about diffing the whole core output (and using -ddump-simpl). If > > there's a performance difference then there must be a difference in the > > core code too.
> I can't exactly use diff because the generated identifier names are not the > same, > but after poring over with Emacs ediff I have found only one difference that's > not attributable to identifiers: > > $diff main.simpl imported.simpl > ... > 223c232 > < a_s1rs [ALWAYS Just L] :: GHC.Integer.Internals.Integer > --- > > a_s1sV [ALWAYS Just S] :: GHC.Integer.Internals.Integer > ... Good find! > Does this S vs. L difference have anything to do with strictness and laziness? Yes. So, I think we should open a ghc but report with all the details, particularly the example's source, the ghc version and that highlight of that strictness difference. Duncan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
