Re: [boost] different matrix library?

Subject: Re: [boost] different matrix library?
From: DE (satan66613_at_[hidden])
Date: 2009-08-27 11:28:59

on 26.08.2009 at 20:38
 joel wrote :
>> a thought about operations tweaks
>>
>> one may want to tile and/or partially unroll operation loops
>> but since such thing characterize operations rather than objects
>> themselves it is wrong to tag the objects with such info
>> consider
>>
>>     matrix<double, tile<3, 3> > tiled1;  //the first one
>>     //...
>>     matrix<double, tile<3, 1> > tiled2;  //far from the first one
>>     //...
>>     matrix<double> result = tiled1*tiled2;  //what tiling would occure
> In those cases, we compute the smallest common multiple of tiling shape
> as stated in all loop optimization techniques paper.
i consider it a bad (erroneos) practice because in such a case neither
of programmers intentions would take place but something totally
different instead

'3' is a common number as well as 'power of 2'
in such a common case like

    matrix<double, tile<32, 32> > t32;
    //...
    matrix<double, tile<3, 3> > t3;  //maybe in some function
    //...                            //intention is to tile 3x3
    m = t32*t3;                      //don't know about func'
                                     //parameter tiling
according to your words, tiling would not occure at all!!!
but that is not the programmer's intention indeed!

i would prefer at least one of either tiling (most appropriate) to take
place but not that totally different thing

-- 
Pavel