[PATCH] Use x86 bsr instruction in Log2 functions
Michel Dänzer
michel at tungstengraphics.com
Tue Sep 18 03:30:42 PDT 2007
On Tue, 2007-09-18 at 12:23 +0200, Erik Andrén wrote:
>
>
> 2007/9/18, Michel Dänzer <michel at tungstengraphics.com>:
> On Mon, 2007-09-17 at 15:37 -0400, Matt Turner wrote:
> > This patch edits RADEONLog2 and ATILog2 to use the x86 bsr
> instruction
> > instread of looping through bits. It should provide a
> somewhat of a
> > speed increase in this function on x86 and AMD64
> architectures.
>
> Have you seen any profiles where these were anywhere near the
> top
> though? Not sure it's worth bothering otherwise.
>
>
> P.S. There's a xorg-driver-ati list dedicated to
> xf86-video-ati
> development.
>
>
> Where would one find this ati specific list?
http://lists.x.org/mailman/listinfo/xorg-driver-ati
--
Earthling Michel Dänzer | http://tungstengraphics.com
Libre software enthusiast | Debian, X and DRI developer
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