dlib - d utility library

[Dmitry Olshansky]

On 28-Sep-12 21:47, Peter Alexander wrote:
> On Friday, 28 September 2012 at 09:43:34 UTC, Timur Gafarov wrote:
>> dlib is a growing collection of native D language libraries serving as
>> a framework for various higher-level projects - such as game engines,
>> rendering pipelines and multimedia applications. It is written in D2
>> and has no external external dependencies aside D's standart library,
>> Phobos.
>
> A note on your Vector implementation. Currently you use the vector
> operators, e.g.
>
>      Vector!(T,size) opAddAssign (Vector!(T,size) v)
>      body
>      {
>          arrayof[] += v.arrayof[];
>          return this;
>      }
>
> This is fine for large vectors, but (correct me if I'm wrong), your
> vector class appears to be designed for small vectors. Those vector ops
> currently call a asm optimised function that uses SIMD instructions in a
> loop - it works well for larger vectors with hundreds of elements, but
> for small vectors it's significantly faster to just use:
>
> foreach (i; 0..size)
>      arrayof[i] += v.arrayof[i];
>
In this case simply unrolling it would be much better
(if size is fixed and is small e.g. < 10).

foreach (i; TypeTuple!(1, 2, 3, 4 ... ))
//too bad we still don't have static Iota in Phobos
{
	arrayof[i] += v.arrayof[i];
}


-- 
Dmitry Olshansky