[all-commits] [llvm/llvm-project] 242192: [TableGen][DecoderEmitter] Infer encoding's HasCom...

[Sergei Barannikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2421929ca62af916fa68aeb9463f5a2a9f8fd99d
      https://github.com/llvm/llvm-project/commit/2421929ca62af916fa68aeb9463f5a2a9f8fd99d
  Author: Sergei Barannikov <barannikov88 at gmail.com>
  Date:   2025-08-21 (Thu, 21 Aug 2025)

  Changed paths:
    M llvm/utils/TableGen/DecoderEmitter.cpp

  Log Message:
  -----------
  [TableGen][DecoderEmitter] Infer encoding's HasCompleteDecoder earlier (NFCI) (#154644)

If an encoding has a custom decoder, the decoder is assumed to be
"complete" (always succeed) if hasCompleteDecoder field is true. We
determine this when constructing InstructionEncoding.

If the decoder for an encoding is *generated*, it always succeeds if
none of the operand decoders can fail. The latter is determined based on
the value of operands' DecoderMethod/hasCompleteDecoder. This happens
late, at table construction time, making the code harder to follow.

This change moves this logic to the InstructionEncoding constructor.



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