[Haskell-cafe] GHC vs GCC

Jason Dagit dagit at codersbase.com
Fri Mar 26 17:49:12 EDT 2010

On Fri, Mar 26, 2010 at 2:33 PM, Bryan O'Sullivan <bos at serpentine.com>wrote:

> On Fri, Mar 26, 2010 at 10:46 AM, Rafael Cunha de Almeida <
> almeidaraf at gmail.com> wrote:
>> During a talk with a friend I came up with two programs, one written in
>> C and another in haskell.
> Your Haskell code builds a huge thunked accumulator value, so of course
> it's slow (put bang patterns on all arguments). Also, you should use rem
> instead of mod. Make those tiny changes and you'll get a 5x speedup, to half
> the performance of the C code.

Interesting.  I had to add -fvia-C to get within half the performance of C.
Just bang patterns and rem and I'm 1/5th of C.  I'm on a x86_64 machine.  I
wonder if that plays in.

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