[all-commits] [llvm/llvm-project] 8d6e86: [LSR][term-fold] Ensure the simple recurrence is f...

[patrick-rivos via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d6e867eb2de32ce28ece972c91405db976192c3
      https://github.com/llvm/llvm-project/commit/8d6e867eb2de32ce28ece972c91405db976192c3
  Author: Patrick O'Neill <102189596+patrick-rivos at users.noreply.github.com>
  Date:   2024-03-04 (Mon, 04 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    A llvm/test/Transforms/LoopStrengthReduce/lsr-unreachable-bb-phi-node.ll

  Log Message:
  -----------
  [LSR][term-fold] Ensure the simple recurrence is from the current loop (#83085)

If the phi node found by matchSimpleRecurrence is not from the current
loop, then isAlmostDeadIV panics. With this patch we bail out early.

Signed-off-by: Patrick O'Neill <patrick at rivosinc.com>

---------

Signed-off-by: Patrick O'Neill <patrick at rivosinc.com>



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