[PATCH] D119100: [TableGen] Add a new `encoder` directive into VarLenCodeEmitterGen

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

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The new `encoder` directive can be used to specify custom encoder for a single `operand` or `slice`. This is different from the `EncoderMethod` field within an `Operand`, which affects //every// operands in the target.

In addition, this patch also changes the function signature of the encoder method -- a new argument, `InsertPost`, is added to both the default one (i.e. `getMachineValue`) and the custom one. This argument provides the bit position where the operand will eventually be inserted.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119100

Files:
  llvm/include/llvm/Target/Target.td
  llvm/lib/Target/M68k/MCTargetDesc/M68kMCCodeEmitter.cpp
  llvm/test/TableGen/VarLenEncoder.td
  llvm/utils/TableGen/VarLenCodeEmitterGen.cpp

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