[all-commits] [llvm/llvm-project] 753008: [flang][OpenMP] Lower target in_reduction for host...

[Sairudra More via All-commits]

  Branch: refs/heads/users/saieiei/target-in-reduction
  Home:   https://github.com/llvm/llvm-project
  Commit: 753008ddd06afed932f2cdf53ec2e245c5e85350
      https://github.com/llvm/llvm-project/commit/753008ddd06afed932f2cdf53ec2e245c5e85350
  Author: Sairudra More <sairudra60 at gmail.com>
  Date:   2026-05-27 (Wed, 27 May 2026)

  Changed paths:
    M flang/lib/Lower/OpenMP/OpenMP.cpp
    R flang/test/Lower/OpenMP/Todo/target-inreduction.f90
    A flang/test/Lower/OpenMP/target-inreduction-unused.f90
    A flang/test/Lower/OpenMP/target-inreduction.f90
    M mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
    M mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
    M mlir/test/Dialect/OpenMP/invalid.mlir
    A mlir/test/Target/LLVMIR/openmp-target-in-reduction.mlir
    M mlir/test/Target/LLVMIR/openmp-todo.mlir

  Log Message:
  -----------
  [flang][OpenMP] Lower target in_reduction for host fallback

Teach Flang lowering and MLIR OpenMP translation to carry
in_reduction through omp.target for the host-fallback path.

The translation looks up task reduction-private storage with
__kmpc_task_reduction_get_th_data and binds the target region's
in_reduction block argument to that private pointer, so uses inside the
region do not keep referring to the original variable.

The patch also preserves in_reduction operands in the TargetOp builder
path and ensures target in_reduction list items are mapped into the
target region when needed.

The device/offload-entry path remains diagnosed as not yet implemented.



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