[all-commits] [llvm/llvm-project] 854bbc: [X86][CodeGen] security check cookie execute only ...

[Mahesh-Attarde via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 854bbc50fc99ddf71c4c65193e06eb79ce1ef69f
      https://github.com/llvm/llvm-project/commit/854bbc50fc99ddf71c4c65193e06eb79ce1ef69f
  Author: Mahesh-Attarde <145317060+mahesh-attarde at users.noreply.github.com>
  Date:   2024-07-08 (Mon, 08 Jul 2024)

  Changed paths:
    M llvm/lib/Target/X86/CMakeLists.txt
    M llvm/lib/Target/X86/X86.h
    M llvm/lib/Target/X86/X86TargetMachine.cpp
    A llvm/lib/Target/X86/X86WinFixupBufferSecurityCheck.cpp
    M llvm/test/CodeGen/X86/opt-pipeline.ll
    M llvm/test/CodeGen/X86/stack-protector-msvc.ll
    M llvm/test/CodeGen/X86/tailcc-ssp.ll

  Log Message:
  -----------
  [X86][CodeGen] security check cookie execute only when needed (#95904)

For windows __security_check_cookie call gets call everytime function is return without fixup. Since this function is defined in runtime library, it incures cost of call in dll which simply does comparison and returns most time. With Fixup, We selective move to call in DLL only if comparison fails.



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