dlib - d utility library

[Dmitry Olshansky]

On 29-Sep-12 20:39, Dmitry Olshansky wrote:
> 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 ... ))
Sorry I've meant 0, 1, 2, 3 ...

> //too bad we still don't have static Iota in Phobos
> {
>      arrayof[i] += v.arrayof[i];
> }
>
>


-- 
Dmitry Olshansky