[llvm-branch-commits] [clang] [llvm] [X86][ACE] Add x86_bsr type and Block Scale Register support (PR #208706)

[Phoebe Wang via llvm-branch-commits]

phoebewang wrote:

I agree we should use [Target Extension Type](https://llvm.org/docs/LangRef.html#target-extension-type) for the new type here. I'm not sure if we want to change `x86_amx`. There are users already.

I think spilling is more important if the scale needs to change frequently. But I'm not familar with the use model for now.

https://github.com/llvm/llvm-project/pull/208706