[all-commits] [llvm/llvm-project] 6f51f8: [Docs] Improve Target TableGen Docs (#178518)

[Sam Elliott via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f51f8e0f93e6ff2baf0ed2f60021308920a557f
      https://github.com/llvm/llvm-project/commit/6f51f8e0f93e6ff2baf0ed2f60021308920a557f
  Author: Sam Elliott <aelliott at qti.qualcomm.com>
  Date:   2026-02-12 (Thu, 12 Feb 2026)

  Changed paths:
    M llvm/include/llvm/Target/Target.td
    M llvm/include/llvm/Target/TargetSelectionDAG.td

  Log Message:
  -----------
  [Docs] Improve Target TableGen Docs (#178518)

This change adds documentation for some of the advanced parts of the
TableGen Selection structures:
- The `set`, `node` and `srcvalue` special DAG nodes
- The `SDNodeXForm` C++ snippet.
- The `PatFrags` predicate C++ snippet, and documentation for how the
`OperandTransform` item works in a little more detail.
- The `ImmLeaf` predicate code.

This also adds documentation for the many C++ callbacks for Targets
associated with Decoding, Encoding, Parsing and Printing Operands and
Instructions, including Predicates.

Co-authored-by: Craig Topper <craig.topper at sifive.com>



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