[PATCH] D104049: [AMDGPU] [CodeGen] Fold negate llvm.amdgcn.class into test mask

[Anshil Gandhi via Phabricator via llvm-commits]

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- Implemented the following fold-negate transformation in the very beginning of AMDGPUCodegenPrepare.cpp:

`xor (llvm.amdgcn.class x, mask), -1` --> `llvm.amdgcn.class(x, ~mask)`

- Added regression tests


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104049

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
  llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-foldnegate.ll

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