[all-commits] [llvm/llvm-project] 0136a4: [OpenMP] Add an option to limit shared memory usag...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0136a4401f90b1effd07b3ac8575fdb155f9984d
      https://github.com/llvm/llvm-project/commit/0136a4401f90b1effd07b3ac8575fdb155f9984d
  Author: Joseph Huber <jhuber6 at vols.utk.edu>
  Date:   2022-02-18 (Fri, 18 Feb 2022)

  Changed paths:
    M llvm/lib/Transforms/IPO/OpenMPOpt.cpp
    M llvm/test/Transforms/OpenMP/replace_globalization.ll

  Log Message:
  -----------
  [OpenMP] Add an option to limit shared memory usage in OpenMPOpt

One of the optimizations performed in OpenMPOpt pushes globalized
variables to static shared memory. This is preferable to keeping the
runtime call in all cases, however if too many variables are pushed to
hared memory the kernel will crash. Since this is an optimization and
not something the user specified explicitly, there should be an option
to limit this optimization in those cases. This path introduces the
`-openmp-opt-shared-limit=` option to limit the amount of bytes that
will be placed in shared memory from HeapToShared.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D120079