Hi, This patch implements ff_hscale_8_to_15_neon with NEON fused multiply accumulate and bumps the vectorization factor from 2 to 4. I have seen speedups up to 15% on Graviton A1 instances based on A-72 cpus.
$ ffmpeg -nostats -f lavfi -i testsrc2=4k:d=2 -vf bench=start,scale=1024x1024,bench=stop -f null - before: t:0.040303 avg:0.040287 max:0.040371 min:0.039214 after: t:0.037339 avg:0.037327 max:0.037550 min:0.036992 Tested with `make check` on aarch64-linux.
0001-aarch64-use-FMA-and-increase-vector-factor-to-4.patch
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