[llvm] AMDGPU: Mark v_mov_b64_pseudo as a VOP1 instruction (PR #128677)

[Jay Foad via llvm-commits]

jayfoad wrote:

> > Couldn't it check `isVALU` instead of `isVOP1 || isVOP2 || isVOP3`?
> 
> That would also cover memory instructions

I only see a couple of weird BUF and FLAT instructions that also set `VALU = 1`. `isVALU && !isVMEM` still seems neater than listing all the different kinds of VOP.

https://github.com/llvm/llvm-project/pull/128677