Re: [Caml-list] doing MMX through ocaml

[Damien Bobillot <damien.bobillot@m4x.org>]

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Le 17 nov. 05 à 23:43, Daniel Bünzli a écrit :

>
> Le 17 nov. 05 à 23:16, Damien Bobillot a écrit :
>
>> PS : I think it will perhaps have the same problems as floating  
>> computation, which is not really efficient. As far as I know,  
>> floats are not stored as float in memory, but as a generic ocaml  
>> value  : a pointer to a structure contains a tag indicating that  
>> it's a float, and after the IEEE float value.
>
> This not exactly true. As an exception, they are unboxed in records  
> and arrays made of floats only [1,2].
>
> Note that you can also use bigarrays [3] to have unboxed arrays of  
> any scalar datatype.
>
> This page [4] (unfortunately not available in the faq of the new  
> ocaml site) contains interesting information about writing  
> numerical code in ocaml.

Ok, and thank you for the references.

Perhaps, writing a bigarray-like module for vectorized operation may  
be the solution.

> [1] <http://caml.inria.fr/pub/docs/manual-ocaml/ 
> manual032.html#htoc218>
> [2] <http://caml.inria.fr/pub/docs/manual-ocaml/ 
> manual032.html#htoc219>
> [3] <http://caml.inria.fr/pub/docs/manual-ocaml/ 
> manual043.html#htoc261>
> [4] <http://caml.inria.fr/pub/old_caml_site/ocaml/numerical.html>


-- 
Damien alias Schmurtz
aim:goim?screenname=schmuuurtz


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