[PATCH] D132331: [llvm] Mark CFGuard fn ptr symbol as DSO local and add tests for mingw

[Alvin Wong via Phabricator via llvm-commits]

alvinhochun created this revision.
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For mingw target, if a symbol is not marked DSO local, a `.refptr` is
generated for it. This makes CFG check calls use an extra pointer
dereference, which adds extra overhead compared to the MSVC version,
so mark the CFG guard check funciton pointer DSO local to stop it.
This should have no effect on MSVC target.

Also adapt the existing cfguard tests to run for mingw targets, so that
this change is checked.

Depends on D132302 <https://reviews.llvm.org/D132302>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132331

Files:
  llvm/lib/Transforms/CFGuard/CFGuard.cpp
  llvm/test/CodeGen/AArch64/cfguard-checks.ll
  llvm/test/CodeGen/AArch64/cfguard-module-flag.ll
  llvm/test/CodeGen/ARM/cfguard-checks.ll
  llvm/test/CodeGen/ARM/cfguard-module-flag.ll
  llvm/test/CodeGen/WinCFGuard/cfguard-cast.ll
  llvm/test/CodeGen/WinCFGuard/cfguard-giats.ll
  llvm/test/CodeGen/WinCFGuard/cfguard-mingw.ll
  llvm/test/CodeGen/X86/cfguard-checks.ll
  llvm/test/CodeGen/X86/cfguard-module-flag.ll
  llvm/test/CodeGen/X86/cfguard-x86-64-vectorcall.ll
  llvm/test/CodeGen/X86/cfguard-x86-vectorcall.ll

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