[PATCH] D121696: [AMDGPU][MC][NFC] Refactored custom operands handling

[Dmitry Preobrazhensky via Phabricator via llvm-commits]

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The original design of custom operands support assumed that most GPUs
have the same or very similar operand names end encoding. This is
no longer the case. As a result the support code becomes over-complicated
and difficult to maintain.

This change proposes a different design with the following benefits:

- support of aliases;
- support of different encodings of the same operand name depending on GPU;
- identification of defined but unsupported operands.

This is the first part of the change. A patch for sendmsg(...) will be submitted separately.


https://reviews.llvm.org/D121696

Files:
  llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
  llvm/lib/Target/AMDGPU/SIDefines.h
  llvm/lib/Target/AMDGPU/Utils/AMDGPUAsmUtils.cpp
  llvm/lib/Target/AMDGPU/Utils/AMDGPUAsmUtils.h
  llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
  llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h

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