HEVC motion compensation - 4k performance test.

Just tested performance with 4k video clip (3840x2160):

• AMD HD 7750 ~ 52 FPS;
• Intel i5-3570K single core at 3.4 GHz ~ 12-24 FPS, depending on actual motion vectors;
• Intel HD Graphics 4000 ~ 10-20 FPS, depending on actual motion vectors.

Note: For now I'm using different OpenCL code for AMD and other Intel's devices.
The reason is huge difference in performance if branches are used.
AMD wants only calculations, without branches.
Intel can handle branches and thus reduce amount of calculations.