[all-commits] [llvm/llvm-project] 2eb639: [SROA] Unfold gep of index phi (#83087)

[Arthur Eubanks via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2eb63982e88b9ed8336158d35884b1a1d04a0f78
      https://github.com/llvm/llvm-project/commit/2eb63982e88b9ed8336158d35884b1a1d04a0f78
  Author: Arthur Eubanks <aeubanks at google.com>
  Date:   2024-02-28 (Wed, 28 Feb 2024)

  Changed paths:
    M llvm/lib/Transforms/Scalar/SROA.cpp
    M llvm/test/Transforms/SROA/phi-and-select.ll
    M llvm/test/Transforms/SROA/phi-gep.ll

  Log Message:
  -----------
  [SROA] Unfold gep of index phi (#83087)

If a gep has only one phi as one of its operands and the remaining
indexes are constant, we can unfold `gep ptr, (phi idx1, idx2)` to `phi
((gep ptr, idx1), (gep ptr, idx2))`.

Take care not to unfold recursive phis.

Followup to #80983.



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