[PATCH] D79972: [OpenMP5.0] map item can be non-contiguous for target update

[Chi Chun Chen via Phabricator via cfe-commits]

cchen created this revision.
cchen added a reviewer: ABataev.
Herald added subscribers: cfe-commits, guansong, yaxunl.
Herald added a reviewer: jdoerfert.
Herald added a project: clang.

In order not to modify the `tgt_target_data_update` information but still be
able to pass the extra information for non-contiguous map item (offset,
count, and stride for each dimension), this patch overload `arg` when
the maptype is set as `OMP_MAP_DESCRIPTOR`. The origin `arg` is for
passing the pointer information, however, the overloaded `arg` is an
array of descriptor_dim:

struct descriptor_dim {

  int64_t offset;
  int64_t count;
  int64_t stride

};

and the array size is the same as dimension size. In addition, since we
have count and stride information in descriptor_dim, we can replace/overload the
`arg_size` parameter by using dimension size.

More details can be found here: https://github.com/chichunchen/openmp-50-design/blob/master/target_update_noncontiguous.pptx


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79972

Files:
  clang/include/clang/AST/OpenMPClause.h
  clang/lib/AST/OpenMPClause.cpp
  clang/lib/CodeGen/CGOpenMPRuntime.cpp
  clang/lib/CodeGen/CGOpenMPRuntime.h
  clang/lib/Sema/SemaOpenMP.cpp
  clang/lib/Serialization/ASTReader.cpp
  clang/lib/Serialization/ASTWriter.cpp
  clang/test/OpenMP/target_update_ast_print.cpp
  clang/test/OpenMP/target_update_codegen.cpp

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