ToT llvm autovectorisation for riscv "V" 1.0 is actually really rather decent. Not as good as handcoding, natch, but can get to within a factor of two or better

ToT llvm autovectorisation for riscv "V" 1.0 is actually really rather decent. Not as good as handcoding, natch, but can get to within a factor of two or better especially on workloads which are mostly simple tiny loops over data that's contiguous or has constant stride, as in h264 encoding. Of course, the question is somewhat moot until we have development hardware available to buy that supports the ratified 1.0 version of the vector extensions. So, another year or so I'd guess.