[Mesa-dev] [PATCH 2/2] i965: Guard GetBufferSubData's streaming memcpy load with USE_SSE41

Kenneth Graunke kenneth at whitecape.org
Fri Aug 11 17:14:15 UTC 2017

On Thursday, August 10, 2017 11:50:30 PM PDT Tapani Pälli wrote:
> I do wonder what the target machine is (I haven't seen one that would 
> not have ARCH_X86_HAVE_SSE4_1 true, both 32bit and 64bit) but falling 
> back to memcpy makes perfect sense without USE_SSE4_1;
> Reviewed-by: Tapani Pälli <tapani.palli at intel.com>

I agree - you really want SSE 4.1 support for decent performance on Atoms.
The MOVNTDQA texture upload path, for example, gave us some really big
performance gains on some ChromeOS workloads.

So, while we should patch this, it'd still be worth figuring out if it's
possible to enable it in Android-x86.

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