Removing divisions from od_dir_find8()
Instead of dividing the squared partial sums by the number n of pixels in the line, we multiply by 840/n, where 840=3*5*7*8. This not only avoids the divisions, but it also makes the optimization exact as there is no more rounding. ntt-short1 resuts: MEDIUM (%) HIGH (%) PSNR -0.012070 -0.059644 PSNRHVS -0.016845 -0.020871 SSIM -0.026984 -0.031257 FASTSSIM -0.026078 0.414901 Change-Id: Ie553d5e3a545dee860a00879d724ecfc00f0a974
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