[Haskell-cafe] newbie optimization question
stefanor at cox.net
Sun Oct 28 16:27:43 EDT 2007
On Sun, Oct 28, 2007 at 08:40:28PM +0100, Daniel Fischer wrote:
> Am Sonntag, 28. Oktober 2007 20:09 schrieb Derek Elkins:
> > >
> > > That fits with my experience writing low level numeric code -- Integer
> > > can be a killer.
> > Inline machine operations v. out-of-line calls to an arbitrary precision
> > integer C library: there shouldn't be any surprise here.
> Obviously. However, what if 32 bit integers aren't sufficient?
> What perpetually puzzles me is that in C long long int has very good
> performance, *much* faster than gmp, in Haskell, on my computer, Int64 is
> hardly faster than Integer.
> So I stick to Integer mostly, it may be slow but it's correct.
Int64 in Glasgow Haskell is not implemented for speed - it uses the FFI
to call a number of addition/subtraction/whatever primitives in the
runtime. If this is a problem for you, file a feature request on the
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