Re: [AD] Use MMX to get fast

[aj <aj@xxxxxxxxxx>]

on what platform ( DOS, WinNT,2kXP, Win9x, Linux )  is your routines faster ?



> I use a simple MMX function to move images from memory to video and the 
> time to transfer is much faster than allegro (half of time). Now I'm using 
> Allegro because I'm having a lot of problems with direct accesses to new 
> hardwares; Before, I used my own Operating System.
> I don't know how the allegro make blit's, if it uses "rep movsd" or card 
> accelerated commands. I have a card with VESA 3.0 and my routine is much 
> faster than allegro. I create a routine called "repmovsq" it transfer 8 
> bytes (Quad Word) per cycle, just using:
>
>             mov      ecx,(num of bytes) / 8
>     loopq:
>             movq    MM0,[esi]                        ; esi = source index
>             movq    [edi],MM0                        ; edi = destination 
> index
>             add      esi,8
>             add      edi,8
>             dec      ecx
>             jnz       loopq
>             ;
>             ; here the complement if (num of bytes) is not a multiple of 8
>             ;
>
> ;
> ; opcodes
> ; movq    MM0,[esi] = 0x0F, 0x6F, 0x06
> ; movq    [edi],MM0 = 0x0F, 0x7F, 0x07
> ;
>
>
> My English is not better because I'am brazilian
> best Regards, Rogerio Uchoas Penchel
>
> <mailto:rogerup@xxxxxxxxxx>rogerup@xxxxxxxxxx