[llvm] [AMDGPU] Introduce "amdgpu-sw-lower-lds" pass to lower LDS accesses. (PR #87265)

[via llvm-commits]

b-sumner wrote:

> So why isn't the runtime responsible for setting up this pointer then? It does that effectively for LDS, the allocation is managed as part of the dispatch. That also goes back to my question of why we need to insert explicit free code, instead of just letting the runtime clean it up after as it would need to anyway

Which runtime are you talking about?  The firmware or trap handler?  And where are they going to place the pointer?  Or are you even considering a new architected or reserved register to hold it and a new ABI?

https://github.com/llvm/llvm-project/pull/87265