[llvm] [AMDGPU] (xor (cmp_eq x, 1), -1) -> cmp_neq x, 1 (PR #133698)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

Shouldn't this be a DAG combine instead of a ISel pattern?

https://github.com/llvm/llvm-project/pull/133698