[FFmpeg-devel] [PATCH] lavc/aarch64: Add neon implementation for pix_abs16_y2

[Martin Storsjö]

On Mon, 25 Jul 2022, Hubert Mazur wrote:

> Provide optimized implementation of pix_abs16_y2 function for arm64.
>
> Performance comparison tests are shown below.
> pix_abs_0_2_c: 308.5
> pix_abs_0_2_neon: 39.2
>
> Benchmarks and tests run with checkasm tool on AWS Graviton 3.
>
> Signed-off-by: Hubert Mazur <hum at semihalf.com>
> ---
> libavcodec/aarch64/me_cmp_init_aarch64.c |  3 +
> libavcodec/aarch64/me_cmp_neon.S         | 73 ++++++++++++++++++++++++
> 2 files changed, 76 insertions(+)

Please do the same optimizations as done for pix_abs_xy2 in 
b46de9aba436dea0cff76f3ed0f7c98448367fd0, 
68a03f64240dcbe408c3fd43d1071a105508a588 and 
4136405c86162063e45d40d55c9985f348d4ea0a for this function too
("aarch64: me_cmp: Interleave some of the loads in ff_pix_abs16_xy2_neon", 
"aarch64: me_cmp: Switch from uabd to uabal in ff_pix_abs16_xy2_neon" and 
"aarch64: me_cmp: Don't do uaddlv once per iteration").

// Martin