[all-commits] [llvm/llvm-project] 525167: [X86][CET] Add Diags for targets pre to i686 for `...

[Phoebe Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 52516782972730ff065a34123a9d8876da08c254
      https://github.com/llvm/llvm-project/commit/52516782972730ff065a34123a9d8876da08c254
  Author: Phoebe Wang <phoebe.wang at intel.com>
  Date:   2022-11-04 (Fri, 04 Nov 2022)

  Changed paths:
    M clang/lib/Basic/Targets/X86.h

  Log Message:
  -----------
  [X86][CET] Add Diags for targets pre to i686 for `-fcf-protection`

Intel Control-flow Enforcement Technology (CET) provides new instructions `endbr32/64` for the indirect branch control. They are NOPs on i686 and new targets. We need to check for that in case it crashes on older targets.

Fixes #58737

Reviewed By: nickdesaulniers

Differential Revision: https://reviews.llvm.org/D137317