[PATCH] D90909: [OpenMPOpt] Expand parallel region merging

[Giorgis Georgakoudis via Phabricator via llvm-commits]

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The existing implementation of parallel region merging applies only to
consecutive parallel regions that have speculatable sequential
instructions in-between. This patch lifts this limitation to expand
merging with any sequential instructions in-between, except calls to
unmergable OpenMP runtime functions. In-between sequential instructions
in the merged region are sequentialized in a "master" region and any
output values are broadcasted to the following parallel regions and the
sequential region continuation of the merged region.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D90909

Files:
  llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
  llvm/lib/Transforms/IPO/OpenMPOpt.cpp
  llvm/test/Transforms/OpenMP/parallel_region_merging.ll
  llvm/test/Transforms/OpenMP/parallel_region_merging_legacy_pm.ll

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