[Openmp-commits] [PATCH] D151356: [OpenMP] Fix transformed loop's var privacy

Joel E. Denny via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Wed May 24 10:59:01 PDT 2023

jdenny created this revision.
jdenny added reviewers: Meinersbur, ABataev.
jdenny added a project: OpenMP.
Herald added subscribers: sunshaoce, zzheng, guansong, yaxunl.
Herald added a project: All.
jdenny requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: openmp-commits, cfe-commits, jplehr, sstefan1.
Herald added a project: clang.

Without this patch, the following example crashes Clang:

  #pragma omp target map(i)
  #pragma omp tile sizes(2)
  for (i = 0; i < N; ++i)

This patch fixes the crash by changing `Sema::isOpenMPPrivateDecl` not 
to identify `i` as private just because it's the loop variable of a
`tile` construct.

While OpenMP TR11 and earlier do specify privacy for loop variables of
loops *generated* from a `tile` construct, I haven't found text
stating that the original loop variable must be private in the above
example, so this patch leaves it shared.  Even so, it is a bit 
unexpected that value of `i` after the loop is `N - 1` instead of `N`.

  rG LLVM Github Monorepo



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