Arith is not directly under math/complex, it is also generated from lowering from TOSA/MHLO/… when going to linalg I believe (the body of a linalg generic will use these ops often, so to be used in conjunction with linalg).
AMDGPU, Arn-Neon and ARM-SVE should be at the same level as AVX and NVVM at the bottom I think.