[Mesa-dev] [PATCH 1/2] mesa: Add a streaming load memcpy implementation.

Chad Versace chad.versace at linux.intel.com
Wed Nov 6 17:06:32 PST 2013

On 11/06/2013 02:44 PM, Eric Anholt wrote:
> Matt Turner <mattst88 at gmail.com> writes:
>> Uses SSE 4.1's MOVNTDQA instruction (streaming load) to read from
>> uncached memory without polluting the cache.
>> ---
>> We should add runtime detection support later.
> I'd really like to see runtime detection with this.  Effectively not
> supporting this on 32-bit sucks, and doing it this way will encourage
> people to use compiler flags to get this path, even when those compiler
> flags hurt performance in general (in my testing, at least).

This patch, as-is without runtime detection, benefits platform-specific
Linux builds such as ChromiumOS. Seeing that the patch benefits
immediately for some distros, I see no reason to block the patch for lack
of runtime detection.

I would also like to see runtime detection as a follow-up.

Patch 1 is
Reviewed-by: Chad Versace <chad.versace at linux.intel.com>

By the way, I tested this series by playing around on ChromiumOS,
but I don't believe that warrants a Tested-by.

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