[PATCH] Use x86 bsr instruction in Log2 functions
dnusinow at speakeasy.net
Tue Sep 18 17:05:45 PDT 2007
On Tue, Sep 18, 2007 at 12:23:42PM +0200, Erik AndrÃ©n 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
> Where would one find this ati specific list?
> It doesn't seem to exist on the
> http://lists.freedesktop.org/mailman/listinfo/ page
Speaking of which, are there any other secret mailing lists that should be
on there but aren't? It'd be nice to have that kept up to date.
- David Nusinow, who'll probably be roped in to doing fd.o admin work for
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