[PATCH] D109438: [OpenMP] Do not SPMDize generic regions with no parallel

[Joseph Huber via Phabricator via llvm-commits]

jhuber6 created this revision.
jhuber6 added reviewers: jdoerfert, ggeorgakoudis.
Herald added subscribers: ormris, guansong, hiraditya, yaxunl.
jhuber6 requested review of this revision.
Herald added subscribers: llvm-commits, sstefan1.
Herald added a project: LLVM.

This patch changes SPMDization to not trigger for regions with no
parallelism. Otherwise, this will introduce unnecessary barriers that
will slow the single-threaded region down.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109438

Files:
  llvm/lib/Transforms/IPO/OpenMPOpt.cpp
  llvm/test/Transforms/OpenMP/always_inline_device.ll
  llvm/test/Transforms/OpenMP/get_hardware_num_threads_in_block_fold.ll
  llvm/test/Transforms/OpenMP/is_spmd_exec_mode_fold.ll

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