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4136405c86
The max height is currently documented as 16; the max difference per pixel is 255, and a .8h element can easily contain 16*255, thus keep accumulating in two .8h vectors, and just do the final accumulationat the end. This should work for heights up to 256. This requires a minor register renumbering in ff_pix_abs16_xy2_neon. Before: Cortex A53 A72 A73 Graviton 3 pix_abs_0_0_neon: 97.7 47.0 37.5 22.7 pix_abs_0_1_neon: 154.0 59.0 52.0 25.0 pix_abs_0_3_neon: 179.7 96.7 87.5 41.2 After: pix_abs_0_0_neon: 96.0 39.2 31.2 22.0 pix_abs_0_1_neon: 150.7 59.7 46.2 23.7 pix_abs_0_3_neon: 175.7 83.7 81.7 38.2 Signed-off-by: Martin Storsjö <martin@martin.st>