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Unfortunately unless a private entity sponsors x86 10 bpc SIMD asm as Netflix did for ARM64 NEON I would not expect it to happen soon as it is a pretty low priority on the dav1d roadmap - below even AVX512 8 bpc work, which is not even close to as far along as AVX2 or SSSE3 for completeness right now.
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I'm honestly pretty surprised there's so little interest. Why is this? Is it just that the real hope for short term AV1 adoption via software decode is wide/shallow engagement content like social / user generated?
I suppose in this world it matters more to have comprehensive optimization for 8 bit content across even very old hardware. Seems odd to prioritize AVX512 for 8 bit over something like AVX2 for 10 bit tho :/
Of course all hollywood content is mastered in 10+ bit (even SDR) and is frequently delivered in 10 bit HEVC today. If I was building an AV1 encoding pipeline it sure would be ideal if I could just encode 10 bit and not worry about 8 bit at all..