[llvm-branch-commits] [llvm] [AArch64][SME] Support split ZPR and PPR area allocation (PR #142392)

[Benjamin Maxwell via llvm-branch-commits]

MacDue wrote:

> If you express the size of the hazard padding between the PPRs and ZPRs as a scalable size, that might simplify some of the logic? You wouldn't need to represent the two areas as separate stacks, at least.

It would, but for the sizes of hazard padding and vscale we're interested in, it would result in a much larger allocation than necessary and likely complicate addressing predicates and vectors more so (due to limited ranges for scalable offsets). 

https://github.com/llvm/llvm-project/pull/142392