[PATCH] D55710: add pragmas to control Software Pipelining optimisation

[Alexey Lapshin via Phabricator via cfe-commits]

alexey.lapshin created this revision.
alexey.lapshin added reviewers: bcahoon, kparzysz, aaron.ballman, arphaman, rsmith, marksl, yakush.
Herald added a subscriber: zzheng.

  [PIPELINER] add two pragmas to control Software Pipelining optimisation.
      
    #pragma clang loop pipeline(disable)
      
        Disable SWP optimization for the next loop.
        “disable” is the only possible value.
      
    #pragma clang loop pipeline_ii_count(number)
      
        Set value of initiation interval for SWP
        optimization to specified number value for
        the next loop. Number is the positive value
        greater than 0.
      
    These pragmas could be used for debugging or reducing
    compile time purposes. It is possible to disable SWP for
    concrete loops to save compilation time or to find bugs
    by not doing SWP to certain loops. It is possible to set
    value of initiation interval to concrete number to save
    compilation time by not doing extra pipeliner passes or
    to check created schedule for specific initiation interval.
  
    That is clang part of the fix


https://reviews.llvm.org/D55710

Files:
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticParseKinds.td
  lib/CodeGen/CGLoopInfo.cpp
  lib/CodeGen/CGLoopInfo.h
  lib/Parse/ParsePragma.cpp
  lib/Sema/SemaStmtAttr.cpp
  test/CodeGenCXX/pragma-pipeline.cpp
  test/Parser/pragma-loop.cpp
  test/Parser/pragma-pipeline.cpp
  test/Parser/pragma-unroll-and-jam.cpp

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