[PATCH] D115128: [TableGen][CodeEmitter] Introducing the VarLenCodeEmitterGen infrastructure

[Min-Yih Hsu via Phabricator via llvm-commits]

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Full write up: https://gist.github.com/mshockwave/66e98d099256deefc062633909bb7b5b

The existing CodeEmitterGen infrastructure is unable to generate encoder function for ISAs with variable-length instructions. This patch introduces a new infrastructure to support variable-length instruction encoding, including a new TableGen syntax for writing instruction encoding directives and a new TableGen backend component, VarLenCodeEmitterGen, built on top of CodeEmitterGen.


https://reviews.llvm.org/D115128

Files:
  llvm/include/llvm/Target/Target.td
  llvm/test/TableGen/VarLenEncoder.td
  llvm/utils/TableGen/CMakeLists.txt
  llvm/utils/TableGen/CodeEmitterGen.cpp
  llvm/utils/TableGen/VarLenCodeEmitterGen.cpp
  llvm/utils/TableGen/VarLenCodeEmitterGen.h

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