[llvm] [RISCV][PoC] Schedule RVV instructions with same type first (PR #95924)

[Philip Reames via llvm-commits]

preames wrote:

Interesting prototype!

@michaelmaitland Already responded with a good summary of the concerns, so let me just second him.  

My default would be to assume that the vtype toggles are pretty cheap, and that we should purely be using (1) to tie break when (2) and (3) don't order scheduling, but I'll freely admit I don't have any strong data on this.  I'd encourage you to run a few workloads, and see what you get with different heuristics.  

https://github.com/llvm/llvm-project/pull/95924