[PATCH] D142079: [TableGen] Support custom decoders for variable length instructions

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

myhsu created this revision.
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Just like the `encoder` directive for variable-length instructions, this patch adds a new `decoder` directive to allow custom decoder function on an operand.

Right now, due to the design of DecoderEmitter each operand can only have a single custom decoder in a given instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142079

Files:
  llvm/include/llvm/Target/Target.td
  llvm/test/TableGen/VarLenDecoder.td
  llvm/utils/TableGen/DecoderEmitter.cpp
  llvm/utils/TableGen/VarLenCodeEmitterGen.cpp
  llvm/utils/TableGen/VarLenCodeEmitterGen.h

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