[fpc-devel] SSE in FPC

[Florian Klaempfl]

Dariusz Mazur schrieb:
> Florian Klaempfl pisze:
>> Dariusz Mazur schrieb:
>>  
>>> Jonas Maebe pisze:
>>>    
>>>>> Of course tSSEVector should be declared in System unit.
>>>>> Then  any one can use SSE intentionally
>>>>>         
>>>> Why can't you now? It's not like multiplication has any other meaning
>>>> for arrays. And declaring "magic compiler types" in the system unit is
>>>> something that should be avoided as much as possible (it makes both
>>>> the compiler and rtl harder to adapt and understand).
>>>>       
>>> Of course, but SIMD is thing, which has  more and more impact to
>>> performance. And compiler should respect it (and do this, as Florian
>>> said). But till now nobody know, where compiler use SSE instruction.     
>>
>> Of course one knows. For array operations as shown SSE/SSE2 is used if
>> enabled.
>> _______________________________________________
>>   
> Ok. I only want to discover how to use it.
> if I write
> 
>  type
>           tSSEVector = array[0..1] of double
> var
>      d1 : tSSeVector;
>     d2  : array[0..1]of tSSEVector;
> begin
>   d1:=d2[0]*d2[1];
> end;
> 
> will be work too?

Yes.

> 
> Or something like this:
> 
> function f ;
> 
> var
> 
>   d1,d2,d3 : array[0..4] of integer;
> begin
> 
>     d1:=d2*d3;
> 
> end;

No. Not yet implemented iirc.