[PATCH] D146122: [pragma] Add support for #pragma clang loop prefetch(disable)

[Jiang Haibo via Phabricator via llvm-commits]

Flightor created this revision.
Flightor added reviewers: aaron.ballman, jdoerfert, amusman, Meinersbur, SjoerdMeijer.
Flightor added projects: clang, LLVM.
Herald added subscribers: zzheng, hiraditya, kristof.beyls.
Herald added a project: All.
Flightor requested review of this revision.
Herald added subscribers: llvm-commits, pcwang-thead.

Pass LoopDataPrefetch is enabled by default under the Aarch64 architecture,
but this pass cannot always achieve perfect loop data prefetching. In order
to make it easier for developers to do performance debugging, a new pragma
is added so that developers can prohibit a certain loop perform automatic
data prefetch optimization.


https://reviews.llvm.org/D146122

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/CodeGen/CGLoopInfo.h
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaStmtAttr.cpp
  clang/test/CodeGenCXX/pragma-loop-prefetch.cpp
  clang/test/CodeGenCXX/pragma-loop.cpp
  clang/test/Parser/pragma-loop.cpp
  clang/test/Parser/pragma-unroll-and-jam.cpp
  llvm/docs/LangRef.rst
  llvm/docs/TransformMetadata.rst
  llvm/lib/Transforms/Scalar/LoopDataPrefetch.cpp
  llvm/test/Transforms/LoopDataPrefetch/pragma-prefetch.ll

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