[all-commits] [llvm/llvm-project] fa4cbc: [CodeGen] Fix IntrusiveBackList::deleteNode (#207783)

[Fabian Parzefall via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fa4cbcd7e8b912a85f96c61b6d6e332822d22e7e
      https://github.com/llvm/llvm-project/commit/fa4cbcd7e8b912a85f96c61b6d6e332822d22e7e
  Author: Fabian Parzefall <parzefall at meta.com>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/DIE.h
    M llvm/unittests/CodeGen/DIETest.cpp

  Log Message:
  -----------
  [CodeGen] Fix IntrusiveBackList::deleteNode (#207783)

Issue #207411 reported that IntrusiveBackList::deleteNode does not
delete the correct node if the deleted node is the last node of the
list. Fix by not short circuiting on `Last == &N`.

Additionally, fix three other minor defects: (1) Do not loop infinitely
if node is not in list. Check for sentinel edge. (2) Reset intrusive
list on deleted node to point to itself with sentinel edge. (3) Avoid
multiple template instantiations of the implementation of deleteNode by
moving it to its base class.

Closes #207411.



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