[all-commits] [llvm/llvm-project] 54aa92: [flang] Undo the effects of CSE for hlfir.exactly_...

[Slava Zakharin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 54aa9282edb5a3abe625893a63018bb75dc5c541
      https://github.com/llvm/llvm-project/commit/54aa9282edb5a3abe625893a63018bb75dc5c541
  Author: Slava Zakharin <szakharin at nvidia.com>
  Date:   2025-05-20 (Tue, 20 May 2025)

  Changed paths:
    M flang/lib/Optimizer/HLFIR/Transforms/LowerHLFIROrderedAssignments.cpp
    A flang/test/HLFIR/order_assignments/where-after-cse.fir

  Log Message:
  -----------
  [flang] Undo the effects of CSE for hlfir.exactly_once. (#140190)

CSE may delete operations from hlfir.exactly_once and reuse
the equivalent results from the parent region(s), e.g. from the parent
hlfir.region_assign. This makes it problematic to clone
hlfir.exactly_once before the top-level hlfir.where.
This patch adds a "canonicalizer" that pulls in such operations
back into hlfir.exactly_once.



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