[PATCH] D110029: [OpenMP][Offloading] Use bitset to indicate execution mode instead of value

[Shilei Tian via Phabricator via cfe-commits]

tianshilei1992 created this revision.
tianshilei1992 added reviewers: jdoerfert, jhuber6.
Herald added subscribers: ormris, guansong, hiraditya, yaxunl.
tianshilei1992 requested review of this revision.
Herald added subscribers: llvm-commits, openmp-commits, cfe-commits, sstefan1.
Herald added projects: clang, OpenMP, LLVM.

The execution mode of a kernel is stored in a global variable, whose value means:

- 0 - SPMD mode
- 1 - indicates generic mode
- 2 - SPMD mode execution with generic mode semantics

We are going to add support for SIMD execution mode. It will be come with another
execution mode, such as SIMD-generic mode. As a result, this value-based indicator
is not flexible.

This patch changes to bitset based solution to encode execution mode. Each
position is:
[0] - generic mode
[1] - SPMD mode
[2] - SIMD mode (will be added later)

In this way, `0x1` is generic mode, `0x2` is SPMD mode, and `0x3` is SPMD mode
execution with generic mode semantics. In the future after we add the support for
SIMD mode, `0b1xx` will be in SIMD mode.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110029

Files:
  clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
  clang/test/OpenMP/nvptx_target_parallel_proc_bind_codegen.cpp
  clang/test/OpenMP/nvptx_target_parallel_reduction_codegen.cpp
  clang/test/OpenMP/nvptx_target_simd_codegen.cpp
  clang/test/OpenMP/nvptx_target_teams_distribute_simd_codegen.cpp
  llvm/lib/Transforms/IPO/OpenMPOpt.cpp
  llvm/test/Transforms/OpenMP/get_hardware_num_threads_in_block_fold.ll
  llvm/test/Transforms/OpenMP/is_spmd_exec_mode_fold.ll
  llvm/test/Transforms/OpenMP/spmdization.ll
  llvm/test/Transforms/OpenMP/spmdization_assumes.ll
  llvm/test/Transforms/OpenMP/spmdization_guarding.ll
  openmp/libomptarget/plugins/cuda/src/rtl.cpp

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