[all-commits] [llvm/llvm-project] 340706: [PowerPC] Fix saving of Link Register when using R...

[Stefan Pintilie via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 340706f311e088f51002593b8cc7291500ca024e
      https://github.com/llvm/llvm-project/commit/340706f311e088f51002593b8cc7291500ca024e
  Author: Stefan Pintilie <stefanp at ca.ibm.com>
  Date:   2025-01-22 (Wed, 22 Jan 2025)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
    M llvm/test/CodeGen/PowerPC/ppc64-rop-protection-aix.ll
    M llvm/test/CodeGen/PowerPC/ppc64-rop-protection.ll

  Log Message:
  -----------
  [PowerPC] Fix saving of Link Register when using ROP Protect (#123101)

An optimization was added that tries to move the uses of the mflr
instruction away from the instruction itself. However, this doesn't work
when we are using the hashst instruction because that instruction needs
to be run before the stack frame is obtained.

This patch disables moving instructions away from the mflr in the case
where ROP protection is being used.

---------

Co-authored-by: Lei Huang <lei at ca.ibm.com>



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