Re: [PATCH] drm: micro optimise cache flushing

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, 19 Sep 2012 11:12:41 +1000, Dave Airlie <airlied@xxxxxxxxx> wrote:
> From: Dave Airlie <airlied@xxxxxxxxxx>
> 
> We hit this a lot with i915 and although we'd like to engineer things to hit
> it a lot less, this commit at least makes it consume a few less cycles.
> 
> from something containing
> movzwl 0x0(%rip),%r10d
> to
> add    %r8,%rdx
> 
> I only noticed it while using perf to profile something else.
> 
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>

I would have thought this is something the compiler should, with the
appropriate hints, be smart enough to decide for itself as boot_cpu_data
should be constant once defined. *shrug*
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel


[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux