[Haskell-cafe] Re: speed: ghc vs gcc

Peter Verswyvelen bugfact at gmail.com
Fri Feb 20 10:34:04 EST 2009

Well C# does it with a for loop in 2300ms, and when using a IEnumerable
sequence it needs 19936ms. Very much like the Haskell code. But of course
the Haskell code could optimize the sum I guess, I assume it is using the
lazy version of sum by default.

Anyway it was more of a question. Does GHC perform register allocation (e.g.
using graph colouring)  and loop unrolling?

On Fri, Feb 20, 2009 at 4:22 PM, Colin Paul Adams
<colin at colina.demon.co.uk>wrote:

> >>>>> "Peter" == Peter Verswyvelen <bugfact at gmail.com> writes:
>    Peter> So GHC is about 3 to 4 times slower as Visual C++ / GCC
>    Peter> without loop unrolling, which is not too bad since GHC does
>    Peter> not perform register optimization and loop unrolling yet
>    Peter> no?
> I would call it rather poor.
> And I don't accept a since of that form as valid mitigation.
> --
> Colin Adams
> Preston Lancashire
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