[PATCH] D55928: [OpenMP] Add flag for preventing the extension to 64 bits for the collapse loop counter

[Gheorghe-Teodor Bercea via Phabricator via cfe-commits]

gtbercea created this revision.
gtbercea added reviewers: ABataev, caomhin.
Herald added subscribers: cfe-commits, guansong.

Introduce a compiler flag for cases when the user knows that the collapsed loop counter can be safely represented using at most 32 bits. This will prevent the emission of expensive mathematical operations (such as the div operation) on the iteration variable using 64 bits where 32 bit operations are sufficient.


Repository:
  rC Clang

https://reviews.llvm.org/D55928

Files:
  docs/OpenMPSupport.rst
  include/clang/Basic/LangOptions.def
  include/clang/Driver/Options.td
  lib/Driver/ToolChains/Clang.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Sema/SemaOpenMP.cpp
  test/OpenMP/nvptx_target_teams_distribute_parallel_for_codegen.cpp

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