[all-commits] [llvm/llvm-project] 199d6f: LSV: document hang reported in #37865 (#102479)

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 199d6f2c0c5a7ceffe00036ae34e8a0f638e8a53
      https://github.com/llvm/llvm-project/commit/199d6f2c0c5a7ceffe00036ae34e8a0f638e8a53
  Author: Ramkumar Ramachandra <ramkumar.ramachandra at codasip.com>
  Date:   2024-08-09 (Fri, 09 Aug 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
    A llvm/test/Transforms/LoadStoreVectorizer/AArch64/pr37865.ll

  Log Message:
  -----------
  LSV: document hang reported in #37865 (#102479)

LoadStoreVectorizer hangs on certain examples, when its reorder function
goes into a cycle. Detect this cycle and explicitly forbid it, using an
assert, and document the resulting crash in a test-case under AArch64.



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