[PATCH] D44232: [SimplifyCFG] Create attribute to disable select formation.

[Matt Morehouse via Phabricator via llvm-commits]

morehouse created this revision.
morehouse added reviewers: vitalybuka, davide, arsenm, hfinkel.
Herald added subscribers: hiraditya, javed.absar, wdng, mehdi_amini.

When building with libFuzzer, converting control flow to selects
reduces the coverage signal available to libFuzzer when trying to
find new inputs.  This patch provides a way to disable CFG
transforms that do this when building with libFuzzer.

Provides a less aggressive alternative to
https://reviews.llvm.org/D44057.


https://reviews.llvm.org/D44232

Files:
  llvm/include/llvm/Bitcode/LLVMBitCodes.h
  llvm/include/llvm/IR/Attributes.td
  llvm/lib/AsmParser/LLLexer.cpp
  llvm/lib/AsmParser/LLParser.cpp
  llvm/lib/AsmParser/LLToken.h
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
  llvm/lib/IR/Attributes.cpp
  llvm/lib/IR/Verifier.cpp
  llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp
  llvm/lib/Transforms/Utils/CodeExtractor.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/Transforms/SimplifyCFG/no-simplify-cfg.ll

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