[Haskell-cafe] Problems with strictness analysis?
lemming at henning-thielemann.de
Mon Nov 3 17:39:00 EST 2008
On Mon, 3 Nov 2008, Luke Palmer wrote:
> On Mon, Nov 3, 2008 at 2:54 PM, Don Stewart <dons at galois.com> wrote:
>> "Optimisations" enable strictness analysis.
> I was actually being an annoying purist. "f is strict" means "f _|_ =
> _|_", so strictness is a semantic idea, not an operational one.
> Optimizations can change operation, but must preserve semantics.
> But I'm not just picking a fight. I'm trying to promote equational
> reasoning over operational reasoning in the community, since I believe
> that is Haskell's primary strength.
Maybe I missed the point, but the optimization seems correct to me.
Without optimization and its (strictness) analysis the program would still
output the correct answer - given that the stack is sufficiently large.
Optimization simply makes this program run using much less space. Right?
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