[PATCH] D41723: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre..

[Chandler Carruth via Phabricator via llvm-commits]

chandlerc updated this revision to Diff 129849.
chandlerc added a comment.

Re-implement the indirectbr removal pass based on Rafael's suggestion. It now
creates a single switch block and threads all the indirictbr's in the function
through that block. This should give substantially smaller code especially in
the case of using retpoline where the switch block expands to a search tree
that we probably don't want to duplicate 100s of times.


Repository:
  rL LLVM

https://reviews.llvm.org/D41723

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Basic/Targets/X86.h
  clang/test/Driver/x86-target-features.c
  lld/ELF/Arch/X86.cpp
  lld/ELF/Arch/X86_64.cpp
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/test/ELF/i386-retpoline-nopic.s
  lld/test/ELF/i386-retpoline-pic.s
  lld/test/ELF/x86-64-retpoline-znow.s
  lld/test/ELF/x86-64-retpoline.s
  llvm/include/llvm/CodeGen/Passes.h
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/CodeGen/TargetPassConfig.h
  llvm/include/llvm/CodeGen/TargetSubtargetInfo.h
  llvm/include/llvm/InitializePasses.h
  llvm/lib/CodeGen/CMakeLists.txt
  llvm/lib/CodeGen/CodeGen.cpp
  llvm/lib/CodeGen/IndirectBrExpandPass.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/lib/CodeGen/TargetSubtargetInfo.cpp
  llvm/lib/Target/X86/CMakeLists.txt
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86AsmPrinter.h
  llvm/lib/Target/X86/X86FastISel.cpp
  llvm/lib/Target/X86/X86FrameLowering.cpp
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/lib/Target/X86/X86InstrControl.td
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/lib/Target/X86/X86MCInstLower.cpp
  llvm/lib/Target/X86/X86RetpolineThunks.cpp
  llvm/lib/Target/X86/X86Subtarget.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/O0-pipeline.ll
  llvm/test/CodeGen/X86/retpoline-external.ll
  llvm/test/CodeGen/X86/retpoline.ll
  llvm/test/Transforms/IndirectBrExpand/basic.ll
  llvm/tools/opt/opt.cpp

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