[llvm] [AMDGPU] NFC: Add helper to query archVGPR (PR #102690)

[Jeffrey Byrnes via llvm-commits]

jrbyrnes wrote:

> Where is the use of it?

For intended use, see

https://github.com/llvm/llvm-project/pull/93090/files -- changes to llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp :: getRegisterPressures

I have not yet used getArchVGPRNum there, but I am working on putting together a body of work for that PR.

In this function, we copy over the GCNRegisterPressure into the Pressure vector. Pressure[AMDGPU::RegisterPressureSets::VGPR_32] should be the archVGPR pressure, but GCNRegisterPressure interface only has getVGPRNum which aggregates the archVGPR + AGPR pressure 


https://github.com/llvm/llvm-project/pull/102690