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David Barker authored
Add SSE2 lowbd and SSSE3 highbd versions of the filters introduced in https://aomedia-review.googlesource.com/c/11962/ . These filters are equivalent in speed to the SSE2 implementations of the regular convolve filter. The average time to filter a 64x64 block is: lowbd C: 52us lowbd SSE2: 5.6us highbd C: 53us highbd SSSE3: 5.8us Also add a correctness test based on the warp filter tests. Change-Id: Ia0d81100e8a414bbfc2b5f664d751cf24765299e
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