[PATCH] Use x86 bsr instruction in Log2 functions

David Nusinow dnusinow at speakeasy.net
Tue Sep 18 17:05:45 PDT 2007

On Tue, Sep 18, 2007 at 12:23:42PM +0200, Erik Andrén wrote:
>    2007/9/18, Michel Dänzer <[1]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?
>    It doesn't seem to exist on the
>    [2]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
   this email

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