[all-commits] [llvm/llvm-project] f66e87: [LoopSimplifyCFG] Add check for missing loop prehe...

[Justus Klausecker via All-commits]

  Branch: refs/heads/release/21.x
  Home:   https://github.com/llvm/llvm-project
  Commit: f66e8745047ea04958e13bf02bae75ab15805e3c
      https://github.com/llvm/llvm-project/commit/f66e8745047ea04958e13bf02bae75ab15805e3c
  Author: Justus Klausecker <117751770+Justus2308 at users.noreply.github.com>
  Date:   2025-07-24 (Thu, 24 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopSimplifyCFG.cpp
    A llvm/test/Transforms/LoopSimplifyCFG/enter-through-indirectbr.ll

  Log Message:
  -----------
  [LoopSimplifyCFG] Add check for missing loop preheader (#149743)

Closes #147869
Closes #149679

Adds a check for a missing loop preheader during analysis. This fixes a
nullptr dereference that happened whenever LoopSimplify was unable to
generate a preheader because the loop was entered by an indirectbr
instruction (as stated in the LoopSimplify.cpp doc comment).

(cherry picked from commit 04107209856bb39e041aa38cf40de0afa90a6b2d)



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