[Mlir-commits] [mlir] [mlir][ArmSME] Add initial SME vector legalization pass (PR #79152)

[Benjamin Maxwell]

MacDue wrote:

> Great work! I acknowledge the complexity of this PR but I was wondering how much the "vector register splitting" side could be generalized to make it reusable by other targets. Vector register legalization is something that has come up multiple times so having a pass that can be parametrized accordingly would be extremely valuable. What are your thoughts about this? :)

I think the logic here could be generalized (though, as written, I've made assumptions about scalability). I think it'd always be a rank-preserving legalization (i.e. 2D -> 2D, like here, or 1D to 1D, etc). Other transforms like unrolling fixed vectors can already be handled elsewhere (and would be complex to incorporate). 

https://github.com/llvm/llvm-project/pull/79152