Preprocessing Passes

• Devirtualization

  • Statically devirtualize virtual functions
  • Driver: tests/scripts/devirtualize
  • Main passes: -devirtualize
  • Main file: lib/Devirt/Devirtualize.cpp

• Internalization

  • Functionality: internalize global symbols
  • Driver: None
  • Main passes: -internalize -internalize-public-api-list=main -ipconstprop -ipsccp -deadargelim
  • Main file: None

• (Optional) Aggressive Inlining

  • Functionality: Aggressively inline functions in the hot functions
  • Driver: None
  • Main passes: -lamp-inst-cnt -lamp-map-loop -lamp-load-profile -always-inline -aggr-inliner
  • Main file: lib/AggrInliner/Inliner.cpp

• Instruction naming

  • Functionality: Name each instruction with a unique ID in Metadata
  • Driver: None
  • Main passes: -metadata-namer
  • Main file: ./lib/Metadata/Namer.cpp

• Other transformations before parallelizations:

  • Functionality: LLVM passes that make loops more canonical or easier to parallelize
  • Passes: -mem2reg -simplifycfg -simplifycfg-sink-common=false -instcombine -tailcallelim -loop-simplify -lcssa -licm -loop-unswitch -globalopt -instcombine -ipsccp -gvn -dse -adce -loop-simplify -lcssa -indvars -loop-deletion -instcombine -indvars