[llvm-branch-commits] [llvm] [MachinePipeliner] Increase the default maximum MII to 256 (PR #212537)

[Sumanth Gundapaneni via llvm-branch-commits]

sgundapa wrote:

Giving the backend a choice to pick MII is ideal, for the time being. 
I would assume, higher MII adds no value to Hexagon, unless the code is heavily sequential in nature. On the flip side, if we do pipeline with higher MII, we end up increasing the register pressure. We can look in to register pressure aware pipelining, but will need time.   

https://github.com/llvm/llvm-project/pull/212537