[all-commits] [llvm/llvm-project] 454d44: [OpenMP] Use a memory fence before incrementing th...

[Xing Xue via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 454d4496970f665200b5b300578894d78405b6ca
      https://github.com/llvm/llvm-project/commit/454d4496970f665200b5b300578894d78405b6ca
  Author: Xing Xue <xingxue at outlook.com>
  Date:   2024-04-16 (Tue, 16 Apr 2024)

  Changed paths:
    M openmp/runtime/src/kmp_dispatch.cpp

  Log Message:
  -----------
  [OpenMP] Use a memory fence before incrementing the dispatch buffer index (#87995)

This patch uses a memory fence in function `__kmp_dispatch_next()` to
flush pending memory write invalidates before incrementing the
`volatile` variable `buffer_index` to fix intermittent time-outs of
OpenMP runtime LIT test cases `env/kmp_set_dispatch_buf.c` and
`worksharing/for/kmp_set_dispatch_buf.c`, noting that the same is needed
for incrementing `buffer_index` in function `__kmpc_next_section()`
(line 2600 of `kmp_dispatch.cpp`).



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