[all-commits] [llvm/llvm-project] 19c9a1: [LAA] Include IndirectUnsafe in ::isPossiblyBackward.

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 19c9a1c2fd2c3849439bca2ba5084dada4d1f47f
      https://github.com/llvm/llvm-project/commit/19c9a1c2fd2c3849439bca2ba5084dada4d1f47f
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-18 (Thu, 18 Jul 2024)

  Changed paths:
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp

  Log Message:
  -----------
  [LAA] Include IndirectUnsafe in ::isPossiblyBackward.

Similarly to Unknown, IndirectUnsafe should also be considered possibly
backward, as it may be a backwards dependency e.g. via loading
different base pointers.

This also brings isPossiblyBackward in line with
Dependence::isSafeForVectorization. At the moment this can't be tested,
as it is not possible to write a test with an AddRec that is based on a
loop varying value. But this may change in the future and may cause
mis-compiles in the future.



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