dav1d 1.4.2 'Road Runner' 1.4.2 is a small release of dav1d, improving notably ARM, AVX-512, RISC-V and Power9 speed It adds numerous new optimizations on 8-tap/6-tap for AVX2, AVX-512; on convolutions for ARM64 extensions (DotProd, i8mm); on prep/put/msac for ARM64 and on loopfilter for Power9.