[all-commits] [llvm/llvm-project] dd58c1: [IR] Simplify DIAssignID by storing its links in t...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dd58c11c641d3e592331e57837fdd674d36dee82
      https://github.com/llvm/llvm-project/commit/dd58c11c641d3e592331e57837fdd674d36dee82
  Author: Fangrui Song <i at maskray.me>
  Date:   2026-09-16 (Wed, 16 Sep 2026)

  Changed paths:
    M llvm/include/llvm/IR/DebugInfo.h
    M llvm/include/llvm/IR/DebugInfoMetadata.h
    M llvm/include/llvm/IR/DebugProgramInstruction.h
    M llvm/include/llvm/IR/Metadata.h
    M llvm/lib/IR/DebugInfo.cpp
    M llvm/lib/IR/DebugProgramInstruction.cpp
    M llvm/lib/IR/LLVMContextImpl.h
    M llvm/lib/IR/Metadata.cpp
    M llvm/lib/IR/Verifier.cpp

  Log Message:
  -----------
  [IR] Simplify DIAssignID by storing its links in the node. NFC (#223324)

AssignmentTrackingPass generates DIAssignID metadata. A DIAssignID links
the instructions it is attached to, kept in
LLVMContextImpl::AssignmentIDToInstrs, with the dbg_assign records that
refer to it, found through a permanent use list (#78300 made DIAssignID
the only always-replaceable MDNode for this). Keep both lists in the
node as TinyPtrVector members instead (98% of instruction lists and
88-96% of record lists hold exactly one pointer), and drop the map and
`isAlwaysReplaceable()`.

Aided by Opus 5



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