[PATCH] D138494: [AMDGPU][MC][MI100+] Enable VOP3 variants of dot2c/dot4c/dot8c opcodes

[Dmitry Preobrazhensky via Phabricator via llvm-commits]

dp created this revision.
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Unfortunately AMD documentation does not specify which modifiers should be supported for these instructions.
The patch enables `abs`, `neg`, `clamp` and `omod` modifiers for `v_dot2c_f32_f16` and `clamp` for remaining `dotc` opcodes, but it is a somewhat arbitrary decision.


https://reviews.llvm.org/D138494

Files:
  llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
  llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
  llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
  llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
  llvm/lib/Target/AMDGPU/VOP2Instructions.td
  llvm/test/MC/AMDGPU/xdl-insts-err.s
  llvm/test/MC/AMDGPU/xdl-insts-gfx908.s
  llvm/test/MC/Disassembler/AMDGPU/gfx908-xdl-insts.txt

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