[Mesa-dev] [PATCH 1/5] i965/tiled_memcpy: ytiled_to_linear a cache line at a time

[Chris Wilson]

Quoting Scott D Phillips (2018-04-03 21:05:41)
> Similar to the transformation applied to linear_to_ytiled, also align
> each readback from the ytiled source to a cacheline (i.e. transfer a
> whole cacheline from the source before moving on to the next column).
> This will allow us to utilize movntqda (_mm_stream_si128) in a
> subsequent patch to obtain near WB readback performance when accessing
> the uncached ytiled memory, an order of magnitude improvement.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris