[all-commits] [llvm/llvm-project] 2a586a: [TableGen][DecoderEmitter] Remove dead OPC_Fail (#...

[Sergei Barannikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2a586a81181fb69c26ba3ea87e051cd4d59e70f8
      https://github.com/llvm/llvm-project/commit/2a586a81181fb69c26ba3ea87e051cd4d59e70f8
  Author: Sergei Barannikov <barannikov88 at gmail.com>
  Date:   2025-08-25 (Mon, 25 Aug 2025)

  Changed paths:
    M llvm/include/llvm/MC/MCDecoderOps.h
    M llvm/test/TableGen/FixedLenDecoderEmitter/additional-encoding.td
    M llvm/test/TableGen/FixedLenDecoderEmitter/big-filter.td
    M llvm/test/TableGen/HwModeEncodeDecode.td
    M llvm/test/TableGen/HwModeEncodeDecode2.td
    M llvm/test/TableGen/HwModeEncodeDecode3.td
    M llvm/test/TableGen/VarLenDecoder.td
    M llvm/test/TableGen/trydecode-emission.td
    M llvm/test/TableGen/trydecode-emission2.td
    M llvm/test/TableGen/trydecode-emission3.td
    M llvm/test/TableGen/trydecode-emission4.td
    M llvm/utils/TableGen/DecoderEmitter.cpp

  Log Message:
  -----------
  [TableGen][DecoderEmitter] Remove dead OPC_Fail (#155229)

It can never be reached. It could be reached if we emitted an opcode
that could fall outside the outermost scope, but emission of all such
opcodes is guarded by `!isOutermostScope()`.

That also means we never add fixups to the outermost scope, so avoid
pushing an entry for it onto the stack.



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