[all-commits] [llvm/llvm-project] dfc8cd: [OpenMP] Preserve host capture lifetimes in fronte...

[Tomas Matheson via All-commits]

  Branch: refs/heads/users/tommat01/dereferenceable
  Home:   https://github.com/llvm/llvm-project
  Commit: dfc8cd5e701290e4c14d5225d096b1674dcbeee9
      https://github.com/llvm/llvm-project/commit/dfc8cd5e701290e4c14d5225d096b1674dcbeee9
  Author: Tomas Matheson <tomas.matheson at arm.com>
  Date:   2026-10-01 (Thu, 01 Oct 2026)

  Changed paths:
    M clang/lib/CodeGen/CGOpenMPRuntime.cpp
    M clang/test/OpenMP/bug54082.c
    A clang/test/OpenMP/callback_capture_lifetime.cpp
    M clang/test/OpenMP/cancel_codegen.cpp
    M clang/test/OpenMP/cancellation_point_codegen.cpp
    M clang/test/OpenMP/debug-info-openmp-array.cpp
    M clang/test/OpenMP/distribute_parallel_for_firstprivate_codegen.cpp
    M clang/test/OpenMP/distribute_parallel_for_lastprivate_codegen.cpp
    M clang/test/OpenMP/distribute_parallel_for_reduction_task_codegen.cpp
    M clang/test/OpenMP/distribute_parallel_for_simd_firstprivate_codegen.cpp
    M clang/test/OpenMP/distribute_parallel_for_simd_lastprivate_codegen.cpp
    M clang/test/OpenMP/for_firstprivate_codegen.cpp
    M clang/test/OpenMP/for_lastprivate_codegen.cpp
    M clang/test/OpenMP/for_linear_codegen.cpp
    M clang/test/OpenMP/for_private_reduction_codegen.cpp
    M clang/test/OpenMP/for_reduction_codegen.cpp
    M clang/test/OpenMP/for_reduction_codegen_UDR.cpp
    M clang/test/OpenMP/for_reduction_task_codegen.cpp
    M clang/test/OpenMP/irbuilder_nested_parallel_for.c
    M clang/test/OpenMP/master_taskloop_in_reduction_codegen.cpp
    M clang/test/OpenMP/master_taskloop_simd_in_reduction_codegen.cpp
    M clang/test/OpenMP/nested_loop_codegen.cpp
    M clang/test/OpenMP/parallel_codegen.cpp
    M clang/test/OpenMP/parallel_copyin_codegen.cpp
    M clang/test/OpenMP/parallel_copyin_combined_codegen.c
    M clang/test/OpenMP/parallel_firstprivate_codegen.cpp
    M clang/test/OpenMP/parallel_for_codegen.cpp
    M clang/test/OpenMP/parallel_for_lastprivate_conditional.cpp
    M clang/test/OpenMP/parallel_for_linear_codegen.cpp
    M clang/test/OpenMP/parallel_for_reduction_task_codegen.cpp
    M clang/test/OpenMP/parallel_for_simd_aligned_codegen.cpp
    M clang/test/OpenMP/parallel_generic_loop_codegen.cpp
    M clang/test/OpenMP/parallel_master_codegen.cpp
    M clang/test/OpenMP/parallel_master_reduction_task_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_firstprivate_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_lastprivate_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_simd_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_simd_firstprivate_codegen.cpp
    M clang/test/OpenMP/parallel_master_taskloop_simd_lastprivate_codegen.cpp
    M clang/test/OpenMP/parallel_reduction_codegen.cpp
    M clang/test/OpenMP/parallel_reduction_task_codegen.cpp
    M clang/test/OpenMP/parallel_sections_reduction_task_codegen.cpp
    M clang/test/OpenMP/reduction_compound_op.cpp
    M clang/test/OpenMP/scope_codegen.cpp
    M clang/test/OpenMP/sections_firstprivate_codegen.cpp
    M clang/test/OpenMP/sections_lastprivate_codegen.cpp
    M clang/test/OpenMP/sections_reduction_codegen.cpp
    M clang/test/OpenMP/sections_reduction_task_codegen.cpp
    M clang/test/OpenMP/single_firstprivate_codegen.cpp
    M clang/test/OpenMP/structured-bindings-codegen.cpp
    M clang/test/OpenMP/target_codegen_global_capture.cpp
    M clang/test/OpenMP/target_in_reduction_codegen.cpp
    M clang/test/OpenMP/target_map_codegen_03.cpp
    M clang/test/OpenMP/target_parallel_num_threads_strict_codegen.cpp
    M clang/test/OpenMP/target_teams_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_firstprivate_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_lastprivate_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_reduction_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_reduction_task_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_simd_firstprivate_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_simd_lastprivate_codegen.cpp
    M clang/test/OpenMP/target_teams_distribute_parallel_for_simd_reduction_codegen.cpp
    M clang/test/OpenMP/target_teams_generic_loop_reduction_codegen.cpp
    M clang/test/OpenMP/task_codegen.cpp
    M clang/test/OpenMP/task_in_reduction_codegen.cpp
    M clang/test/OpenMP/taskloop_in_reduction_codegen.cpp
    M clang/test/OpenMP/taskloop_simd_in_reduction_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_firstprivate_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_lastprivate_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_reduction_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_reduction_task_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_simd_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_simd_firstprivate_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_simd_lastprivate_codegen.cpp
    M clang/test/OpenMP/teams_distribute_parallel_for_simd_reduction_codegen.cpp
    M clang/test/OpenMP/vla_crash.c
    M llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
    M llvm/test/Transforms/OpenMP/parallel_region_merging.ll
    M llvm/unittests/Frontend/OpenMPIRBuilderTest.cpp
    M mlir/test/Target/LLVMIR/omptarget-region-parallel-llvm.mlir
    A mlir/test/Target/LLVMIR/openmp-capture-lifetime.mlir
    M mlir/test/Target/LLVMIR/openmp-dist_schedule_with_wsloop.mlir
    M mlir/test/Target/LLVMIR/openmp-firstprivate.mlir
    M mlir/test/Target/LLVMIR/openmp-private.mlir

  Log Message:
  -----------
  [OpenMP] Preserve host capture lifetimes in frontend lowering

Mark captured alloca/global storage nofreeobj when Clang emits a synchronous
host parallel call. This preserves lifetime across outlining without claiming
that escaped capture slots are noalias or immutable, and without extending the
lifetime guarantee to pointers loaded from those slots.

Mark OpenMPIRBuilder's fresh host capture aggregate noalias and nofreeobj.
This covers the lowering path used by Flang and Clang's IRBuilder mode.

Replace callback Attributor seeding with frontend and translation tests,
including escaped captures, heap references, firstprivate pointers, debug
wrappers, serialized regions, and optimized load hoisting with OpenMPOpt
disabled. Refresh the affected parameter-attribute checks.


  Commit: 0b90fc866faf111aa13dfbf47c6a8cd9e84e6ce1
      https://github.com/llvm/llvm-project/commit/0b90fc866faf111aa13dfbf47c6a8cd9e84e6ce1
  Author: Tomas Matheson <tomas.matheson at arm.com>
  Date:   2026-10-01 (Thu, 01 Oct 2026)

  Changed paths:
    M clang/test/OpenMP/target_teams_generic_loop_codegen.cpp
    M flang/test/Integration/OpenMP/atomic-compare.f90
    M flang/test/Integration/OpenMP/parallel-reduction-mixed.f90

  Log Message:
  -----------
  fix the tests


Compare: https://github.com/llvm/llvm-project/compare/8fe3c1261fa3...0b90fc866faf

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