I found the following article about the topic really good: https://branchfree.org/2019/04/01/fitting-my-head-through-the-arm-holes-or-two-sequences-to-substitut

I found the following article about the topic really good: https://branchfree.org/2019/04/01/fitting-my-head-through-the-arm-holes-or-two-sequences-to-substitute-for-the-missing-pmovmskb-instruction-on-arm-neon/ https://branchfree.org/2019/04/01/fitting-my-head-through-th... In my experience using a 512 wide movemask (to uint64_t) is the fastest on both x86 and arm64. (Edit: just yo clarify, I meant the fastest for iteration, things like SwissMap are better off using 128 wide movemask) With rvv you don't really what to go from a vector mask to a general purpose non vector register, because the vector length may vary. But I found it really useful that vector masks are always packed into v0. So even with LMUL=8, you can just to a vmseq, switch to LMUL=1 and use vfirst & vmsif & vmandn to iterate through all indices. (Alternatively vfirst & vmsof & vmclr would also work, I'm not sure which one would be faster)