[all-commits] [llvm/llvm-project] cc46d0: [flang] Expand SUM(DIM=CONSTANT) into an hlfir.ele...

[Slava Zakharin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc46d0bee967989c12a0040bb3cab1319ae50e79
      https://github.com/llvm/llvm-project/commit/cc46d0bee967989c12a0040bb3cab1319ae50e79
  Author: Slava Zakharin <szakharin at nvidia.com>
  Date:   2024-12-05 (Thu, 05 Dec 2024)

  Changed paths:
    M flang/lib/Optimizer/HLFIR/Transforms/SimplifyHLFIRIntrinsics.cpp
    A flang/test/HLFIR/simplify-hlfir-intrinsics-sum.fir

  Log Message:
  -----------
  [flang] Expand SUM(DIM=CONSTANT) into an hlfir.elemental. (#118556)

An array SUM with the specified constant DIM argument
may be expanded into hlfir.elemental with a reduction loop
inside it processing all elements of the specified dimension.
The expansion allows further optimization of the cases like
`A=SUM(B+1,DIM=1)` in the optimized bufferization pass
(given that it can prove there are no read/write conflicts).



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