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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) Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matt Turner <mattst88@gmail.com> Acked-by: Kenneth Graunke <kenneth@whitecape.org>
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