[all-commits] [llvm/llvm-project] 98eb91: [LoopFlatten] Forget all block and loop dispositio...

[luxufan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 98eb9179398d1e69e1f4416b1ef3bf308171684b
      https://github.com/llvm/llvm-project/commit/98eb9179398d1e69e1f4416b1ef3bf308171684b
  Author: luxufan <luxufan at iscas.ac.cn>
  Date:   2022-11-14 (Mon, 14 Nov 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopFlatten.cpp
    A llvm/test/Transforms/LoopFlatten/pr58865.ll

  Log Message:
  -----------
  [LoopFlatten] Forget all block and loop dispositions after flatten

Method forgetLoop only forgets expression of phi or its users. SCEV
expressions except the above mentioned may still has loop dispositions
that point to the destroyed loop, which might cause a crash.

Fixes: https://github.com/llvm/llvm-project/issues/58865

Reviewed By: nikic, fhahn

Differential Revision: https://reviews.llvm.org/D137651