[all-commits] [llvm/llvm-project] 6f7e94: [TableGen] More efficiency improvements for encode...

[Jason Eckhardt via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f7e940c2d6711c7be8bc5365a1f4da3a328b2eb
      https://github.com/llvm/llvm-project/commit/6f7e940c2d6711c7be8bc5365a1f4da3a328b2eb
  Author: Jason Eckhardt <jeckhardt at nvidia.com>
  Date:   2024-03-11 (Mon, 11 Mar 2024)

  Changed paths:
    M llvm/utils/TableGen/CodeEmitterGen.cpp
    M llvm/utils/TableGen/CodeGenInstruction.h
    M llvm/utils/TableGen/CodeGenTarget.cpp
    M llvm/utils/TableGen/CodeGenTarget.h
    M llvm/utils/TableGen/DecoderEmitter.cpp

  Log Message:
  -----------
  [TableGen] More efficiency improvements for encode/decode emission. (#84647)

DecoderEmitter and CodeEmitterGen perform repeated linear walks over the
entire instruction list. This patch eliminates two more such walks.

The eliminated traversals visit every instruction merely to determine
whether the target has variable length encodings. For a target with
variable length encodings, the original any_of will terminate quickly.
But all targets other than M68k use fixed length encodings and thus
any_of must visit the entire instruction list.



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