On Fri, Mar 26, 2010 at 2:33 PM, Bryan O'Sullivan <b...@serpentine.com>wrote:
> On Fri, Mar 26, 2010 at 10:46 AM, Rafael Cunha de Almeida < > almeida...@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. Jason
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