Scott D Phillips authored Sep 24, 2018 and Tapani Pälli committed Oct 23, 2018

The reference for MOVNTDQA says:

    For WC memory type, the nontemporal hint may be implemented by
    loading a temporary internal buffer with the equivalent of an
    aligned cache line without filling this data to the cache.
    [...] Subsequent MOVNTDQA reads to unread portions of the WC
    cache line will receive data from the temporary internal
    buffer if data is available.

This hidden cache line sized temporary buffer can improve the
read performance from wc maps.

v2: Add mfence at start of tiled_to_linear for streaming loads (Chris)
v3: add Android build support (Tapani)
v4: squash 'fix i915: Fix streaming loads for intel_tiled_memcpy'
    separate sse41 to own static library (Tapani)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
Reviewed-by: Matt Turner <mattst88@gmail.com> (v2)
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>