https://github.com/tblah created
https://github.com/llvm/llvm-project/pull/140092
Fixes #136357
The barrier needs to go between the copying into firstprivate variables and the
initialization call for the OpenMP construct (e.g. wsloop). There is no way of
expressing this in MLIR because for delayed privatization that is all implicit
(added in MLIR->LLVMIR conversion).
The previous approach put the barrier immediately before the wsloop (or
similar). For delayed privatization, the firstprivate copy code would then be
inserted after that, opening the possibility for the race observed in the bug
report.
This patch solves the issue by instead setting an attribute on the mlir
operation, which will instruct openmp dialect to llvm ir conversion to insert a
barrier in the correct place.
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