[ros-dev] [ros-diffs] [tkreuzer] 42353: asm version of DIB_32BPP_ColorFill: - Add frame pointer - Get rid of algin_draw, 32bpp surfaces must be DWORD aligned - Optimize the loop - Add comments
Timo Kreuzer
timo.kreuzer at web.de
Tue Aug 4 19:18:24 CEST 2009
Jose Catena schrieb:
> A correction of my previous msg:
>
> In asm I would write the loop as:
> mov eax, iColor
> mov ebx, pulLine
> mov edx, cy
> L1:
> mov edi, ebx
> mov ecx, _cx
> rep stosd
> add ebx, lDelta
> dec edx
> jnz l1
>
> It is not possible to optimize the loop further AFAIK, and this only saves a
> cmp and jnz in the outer loop, a tiny gain.
>
That looks almost like the version I wrote, except I didn't use memory
access inside the loop, but registers, which should saves some cycles.
More information about the Ros-dev
mailing list