[llvm] [MachineScheduler] Experimental option to partially disable pre-ra scheduling. (PR #90181)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

> Have you tried setting misched-limit as a smaller value? It sounds like if the problem is as you describe it, this option may have a similar impact as the option you propose in this PR. The difference is that you skip large regions entirely and this option limits the size of instructions it is willing to consider in heuristics.

I tried it now on your suggestion, but it is actually making things worse.


https://github.com/llvm/llvm-project/pull/90181