[all-commits] [llvm/llvm-project] dde579: [mlir][OpenMP] Translate task_reduction on omp.tas...

[Sairudra More via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dde579becf31add55c5a473f28fd010df36d2490
      https://github.com/llvm/llvm-project/commit/dde579becf31add55c5a473f28fd010df36d2490
  Author: Sairudra More <sairudra60 at gmail.com>
  Date:   2026-06-18 (Thu, 18 Jun 2026)

  Changed paths:
    M mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
    A mlir/test/Target/LLVMIR/openmp-taskgroup-task-reduction.mlir
    M mlir/test/Target/LLVMIR/openmp-todo.mlir

  Log Message:
  -----------
  [mlir][OpenMP] Translate task_reduction on omp.taskgroup (#199565)

This patch adds LLVM IR translation for `task_reduction` on
`omp.taskgroup`.

Flang already parses, checks, and lowers the relevant task-reduction
constructs to OpenMP MLIR, but the LLVM IR translation path was
incomplete. This patch implements the taskgroup reduction setup needed
by the follow-up taskloop and task `in_reduction` work.

For each reducer on `omp.taskgroup`, the translation emits init and
combiner helpers from the corresponding `omp.declare_reduction` regions,
builds the `kmp_taskred_input_t` descriptor array, and calls
`__kmpc_taskred_init` before entering the taskgroup body.

This patch intentionally keeps `reduction` / `in_reduction` on
`omp.taskloop.context` unsupported. Those are handled in follow-up PRs.

### Stack / review order

This PR is the first layer of the OpenMP task-reduction translation
stack:

1. #199565 — `omp.taskgroup task_reduction` translation
2. #199670 — `omp.taskloop` `reduction` / `in_reduction` translation
3. #202611 — explicit `omp.task in_reduction` translation

Related sibling follow-up:

* #199967 — `omp.target in_reduction` host-fallback lowering

The intended main review order is:

#199565 → #199670 → #202611

Please review this PR as the taskgroup `task_reduction` layer only. The
taskloop, explicit task, and target-specific pieces are split out so
each runtime lowering step can be reviewed separately.

Part of #199560.



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